The Tor Browser: widget/cocoa/nsChildView.mm@ac0c01689b40 (annotated)

widget/cocoa/nsChildView.mm@ac0c01689b40 (annotated)

widget/cocoa/nsChildView.mm

Thu, 15 Jan 2015 15:59:08 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:59:08 +0100
branch: TOR_BUG_9701
changeset 10: ac0c01689b40
permissions: -rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- Mode: objc; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "mozilla/ArrayUtils.h"
 #ifdef MOZ_LOGGING
 #define FORCE_PR_LOG
 #endif
 #include "prlog.h"
 #include <unistd.h>
 #include <math.h>
 #include "nsChildView.h"
 #include "nsCocoaWindow.h"
 #include "mozilla/MiscEvents.h"
 #include "mozilla/MouseEvents.h"
 #include "mozilla/TextEvents.h"
 #include "mozilla/TouchEvents.h"
 #include "nsObjCExceptions.h"
 #include "nsCOMPtr.h"
 #include "nsToolkit.h"
 #include "nsCRT.h"
 #include "nsFontMetrics.h"
 #include "nsIRollupListener.h"
 #include "nsViewManager.h"
 #include "nsIInterfaceRequestor.h"
 #include "nsIFile.h"
 #include "nsILocalFileMac.h"
 #include "nsGfxCIID.h"
 #include "nsIDOMSimpleGestureEvent.h"
 #include "nsNPAPIPluginInstance.h"
 #include "nsThemeConstants.h"
 #include "nsIWidgetListener.h"
 #include "nsIPresShell.h"
 #include "nsDragService.h"
 #include "nsClipboard.h"
 #include "nsCursorManager.h"
 #include "nsWindowMap.h"
 #include "nsCocoaFeatures.h"
 #include "nsCocoaUtils.h"
 #include "nsMenuUtilsX.h"
 #include "nsMenuBarX.h"
 #ifdef __LP64__
 #include "ComplexTextInputPanel.h"
 #endif
 #include "NativeKeyBindings.h"
 #include "gfxContext.h"
 #include "gfxQuartzSurface.h"
 #include "gfxUtils.h"
 #include "nsRegion.h"
 #include "Layers.h"
 #include "ClientLayerManager.h"
 #include "mozilla/layers/LayerManagerComposite.h"
 #include "GLTextureImage.h"
 #include "GLContextProvider.h"
 #include "GLContextCGL.h"
 #include "GLUploadHelpers.h"
 #include "ScopedGLHelpers.h"
 #include "mozilla/layers/GLManager.h"
 #include "mozilla/layers/CompositorOGL.h"
 #include "mozilla/layers/BasicCompositor.h"
 #include "gfxUtils.h"
 #include "mozilla/gfx/2D.h"
 #include "mozilla/gfx/BorrowedContext.h"
 #ifdef ACCESSIBILITY
 #include "nsAccessibilityService.h"
 #include "mozilla/a11y/Platform.h"
 #endif
 #ifdef MOZ_CRASHREPORTER
 #include "nsExceptionHandler.h"
 #endif
 #include "mozilla/Preferences.h"
 #include <dlfcn.h>
 #include <ApplicationServices/ApplicationServices.h>
 #include "GeckoProfiler.h"
 #include "nsIDOMWheelEvent.h"
 using namespace mozilla;
 using namespace mozilla::layers;
 using namespace mozilla::gl;
 using namespace mozilla::widget;
 #undef DEBUG_UPDATE
 #undef INVALIDATE_DEBUGGING  // flash areas as they are invalidated
 // Don't put more than this many rects in the dirty region, just fluff
 // out to the bounding-box if there are more
 #define MAX_RECTS_IN_REGION 100
 #ifdef PR_LOGGING
 PRLogModuleInfo* sCocoaLog = nullptr;
 #endif
 extern "C" {
   CG_EXTERN void CGContextResetCTM(CGContextRef);
   CG_EXTERN void CGContextSetCTM(CGContextRef, CGAffineTransform);
   CG_EXTERN void CGContextResetClip(CGContextRef);
   typedef CFTypeRef CGSRegionObj;
   CGError CGSNewRegionWithRect(const CGRect *rect, CGSRegionObj *outRegion);
 }
 // defined in nsMenuBarX.mm
 extern NSMenu* sApplicationMenu; // Application menu shared by all menubars
 bool gChildViewMethodsSwizzled = false;
 extern nsISupportsArray *gDraggedTransferables;
 ChildView* ChildViewMouseTracker::sLastMouseEventView = nil;
 NSEvent* ChildViewMouseTracker::sLastMouseMoveEvent = nil;
 NSWindow* ChildViewMouseTracker::sWindowUnderMouse = nil;
 NSPoint ChildViewMouseTracker::sLastScrollEventScreenLocation = NSZeroPoint;
 #ifdef INVALIDATE_DEBUGGING
 static void blinkRect(Rect* r);
 static void blinkRgn(RgnHandle rgn);
 #endif
 bool gUserCancelledDrag = false;
 uint32_t nsChildView::sLastInputEventCount = 0;
 @interface ChildView(Private)
 // sets up our view, attaching it to its owning gecko view
 - (id)initWithFrame:(NSRect)inFrame geckoChild:(nsChildView*)inChild;
 - (void)forceRefreshOpenGL;
 // set up a gecko mouse event based on a cocoa mouse event
 - (void) convertCocoaMouseWheelEvent:(NSEvent*)aMouseEvent
                         toGeckoEvent:(WidgetWheelEvent*)outWheelEvent;
 - (void) convertCocoaMouseEvent:(NSEvent*)aMouseEvent
                    toGeckoEvent:(WidgetInputEvent*)outGeckoEvent;
 - (NSMenu*)contextMenu;
 - (void)setIsPluginView:(BOOL)aIsPlugin;
 - (void)setPluginEventModel:(NPEventModel)eventModel;
 - (void)setPluginDrawingModel:(NPDrawingModel)drawingModel;
 - (NPDrawingModel)pluginDrawingModel;
 - (BOOL)isRectObscuredBySubview:(NSRect)inRect;
 - (void)processPendingRedraws;
 - (void)drawRect:(NSRect)aRect inContext:(CGContextRef)aContext;
 - (nsIntRegion)nativeDirtyRegionWithBoundingRect:(NSRect)aRect;
 - (BOOL)isUsingMainThreadOpenGL;
 - (BOOL)isUsingOpenGL;
 - (void)drawUsingOpenGL;
 - (void)drawUsingOpenGLCallback;
 - (BOOL)hasRoundedBottomCorners;
 - (CGFloat)cornerRadius;
 - (void)clearCorners;
 // Overlay drawing functions for traditional CGContext drawing
 - (void)drawTitleString;
 - (void)drawTitlebarHighlight;
 - (void)maskTopCornersInContext:(CGContextRef)aContext;
 // Called using performSelector:withObject:afterDelay:0 to release
 // aWidgetArray (and its contents) the next time through the run loop.
 - (void)releaseWidgets:(NSArray*)aWidgetArray;
 #if USE_CLICK_HOLD_CONTEXTMENU
  // called on a timer two seconds after a mouse down to see if we should display
  // a context menu (click-hold)
 - (void)clickHoldCallback:(id)inEvent;
 #endif
 #ifdef ACCESSIBILITY
 - (id<mozAccessible>)accessible;
 #endif
 - (BOOL)inactiveWindowAcceptsMouseEvent:(NSEvent*)aEvent;
 @end
 @interface NSView(NSThemeFrameCornerRadius)
 - (float)roundedCornerRadius;
 @end
 // Starting with 10.7 the bottom corners of all windows are rounded.
 // Unfortunately, the standard rounding that OS X applies to OpenGL views
 // does not use anti-aliasing and looks very crude. Since we want a smooth,
 // anti-aliased curve, we'll draw it ourselves.
 // Additionally, we need to turn off the OS-supplied rounding because it
 // eats into our corner's curve. We do that by overriding an NSSurface method.
 @interface NSSurface @end
 @implementation NSSurface(DontCutOffCorners)
 - (CGSRegionObj)_createRoundedBottomRegionForRect:(CGRect)rect
 {
   // Create a normal rect region without rounded bottom corners.
   CGSRegionObj region;
   CGSNewRegionWithRect(&rect, &region);
   return region;
 }
 @end
 #pragma mark -
 /* Convenience routine to go from a Gecko rect to Cocoa NSRect.
  *
  * Gecko rects (nsRect) contain an origin (x,y) in a coordinate
  * system with (0,0) in the top-left of the screen. Cocoa rects
  * (NSRect) contain an origin (x,y) in a coordinate system with
  * (0,0) in the bottom-left of the screen. Both nsRect and NSRect
  * contain width/height info, with no difference in their use.
  * If a Cocoa rect is from a flipped view, there is no need to
  * convert coordinate systems.
  */
 #ifndef __LP64__
 static inline void
 ConvertGeckoRectToMacRect(const nsIntRect& aRect, Rect& outMacRect)
 {
   outMacRect.left = aRect.x;
   outMacRect.top = aRect.y;
   outMacRect.right = aRect.x + aRect.width;
   outMacRect.bottom = aRect.y + aRect.height;
 }
 #endif
 // Flips a screen coordinate from a point in the cocoa coordinate system (bottom-left rect) to a point
 // that is a "flipped" cocoa coordinate system (starts in the top-left).
 static inline void
 FlipCocoaScreenCoordinate(NSPoint &inPoint)
 {
   inPoint.y = nsCocoaUtils::FlippedScreenY(inPoint.y);
 }
 void EnsureLogInitialized()
 {
 #ifdef PR_LOGGING
   if (!sCocoaLog) {
     sCocoaLog = PR_NewLogModule("nsCocoaWidgets");
   }
 #endif // PR_LOGGING
 }
 namespace {
 // Manages a texture which can resize dynamically, binds to the
 // LOCAL_GL_TEXTURE_RECTANGLE_ARB texture target and is automatically backed
 // by a power-of-two size GL texture. The latter two features are used for
 // compatibility with older Mac hardware which we block GL layers on.
 // RectTextureImages are used both for accelerated GL layers drawing and for
 // OMTC BasicLayers drawing.
 class RectTextureImage {
 public:
   RectTextureImage(GLContext* aGLContext)
    : mGLContext(aGLContext)
    , mTexture(0)
    , mInUpdate(false)
   {}
   virtual ~RectTextureImage();
   TemporaryRef<gfx::DrawTarget>
     BeginUpdate(const nsIntSize& aNewSize,
                 const nsIntRegion& aDirtyRegion = nsIntRegion());
   void EndUpdate(bool aKeepSurface = false);
   void UpdateIfNeeded(const nsIntSize& aNewSize,
                       const nsIntRegion& aDirtyRegion,
                       void (^aCallback)(gfx::DrawTarget*, const nsIntRegion&))
   {
     RefPtr<gfx::DrawTarget> drawTarget = BeginUpdate(aNewSize, aDirtyRegion);
     if (drawTarget) {
       aCallback(drawTarget, GetUpdateRegion());
       EndUpdate();
     }
   }
   void UpdateFromCGContext(const nsIntSize& aNewSize,
                            const nsIntRegion& aDirtyRegion,
                            CGContextRef aCGContext);
   void UpdateFromDrawTarget(const nsIntSize& aNewSize,
                             const nsIntRegion& aDirtyRegion,
                             gfx::DrawTarget* aFromDrawTarget);
   nsIntRegion GetUpdateRegion() {
     MOZ_ASSERT(mInUpdate, "update region only valid during update");
     return mUpdateRegion;
   }
   void Draw(mozilla::layers::GLManager* aManager,
             const nsIntPoint& aLocation,
             const gfx3DMatrix& aTransform = gfx3DMatrix());
   static nsIntSize TextureSizeForSize(const nsIntSize& aSize);
 protected:
   RefPtr<gfx::DrawTarget> mUpdateDrawTarget;
   GLContext* mGLContext;
   nsIntRegion mUpdateRegion;
   nsIntSize mUsedSize;
   nsIntSize mBufferSize;
   nsIntSize mTextureSize;
   GLuint mTexture;
   bool mInUpdate;
 };
 // Used for OpenGL drawing from the compositor thread for OMTC BasicLayers.
 // We need to use OpenGL for this because there seems to be no other robust
 // way of drawing from a secondary thread without locking, which would cause
 // deadlocks in our setup. See bug 882523.
 class GLPresenter : public GLManager
 {
 public:
   static GLPresenter* CreateForWindow(nsIWidget* aWindow)
   {
     nsRefPtr<GLContext> context = gl::GLContextProvider::CreateForWindow(aWindow);
     return context ? new GLPresenter(context) : nullptr;
   }
   GLPresenter(GLContext* aContext);
   virtual ~GLPresenter();
   virtual GLContext* gl() const MOZ_OVERRIDE { return mGLContext; }
   virtual ShaderProgramOGL* GetProgram(GLenum aTarget, gfx::SurfaceFormat aFormat) MOZ_OVERRIDE
   {
     MOZ_ASSERT(aTarget == LOCAL_GL_TEXTURE_RECTANGLE_ARB);
     MOZ_ASSERT(aFormat == gfx::SurfaceFormat::R8G8B8A8);
     return mRGBARectProgram;
   }
   virtual const gfx::Matrix4x4& GetProjMatrix() const MOZ_OVERRIDE
   {
     return mProjMatrix;
   }
   virtual void BindAndDrawQuad(ShaderProgramOGL *aProg) MOZ_OVERRIDE;
   void BeginFrame(nsIntSize aRenderSize);
   void EndFrame();
   NSOpenGLContext* GetNSOpenGLContext()
   {
     return GLContextCGL::Cast(mGLContext)->GetNSOpenGLContext();
   }
 protected:
   nsRefPtr<mozilla::gl::GLContext> mGLContext;
   nsAutoPtr<mozilla::layers::ShaderProgramOGL> mRGBARectProgram;
   gfx::Matrix4x4 mProjMatrix;
   GLuint mQuadVBO;
 };
 } // unnamed namespace
 #pragma mark -
 nsChildView::nsChildView() : nsBaseWidget()
 , mView(nullptr)
 , mParentView(nullptr)
 , mParentWidget(nullptr)
 , mViewTearDownLock("ChildViewTearDown")
 , mEffectsLock("WidgetEffects")
 , mShowsResizeIndicator(false)
 , mHasRoundedBottomCorners(false)
 , mIsCoveringTitlebar(false)
 , mIsFullscreen(false)
 , mTitlebarCGContext(nullptr)
 , mBackingScaleFactor(0.0)
 , mVisible(false)
 , mDrawing(false)
 , mPluginDrawing(false)
 , mIsDispatchPaint(false)
 , mPluginInstanceOwner(nullptr)
 {
   EnsureLogInitialized();
   memset(&mPluginCGContext, 0, sizeof(mPluginCGContext));
 }
 nsChildView::~nsChildView()
 {
   ReleaseTitlebarCGContext();
   // Notify the children that we're gone.  childView->ResetParent() can change
   // our list of children while it's being iterated, so the way we iterate the
   // list must allow for this.
   for (nsIWidget* kid = mLastChild; kid;) {
     nsChildView* childView = static_cast<nsChildView*>(kid);
     kid = kid->GetPrevSibling();
     childView->ResetParent();
   }
   NS_WARN_IF_FALSE(mOnDestroyCalled, "nsChildView object destroyed without calling Destroy()");
   DestroyCompositor();
   // An nsChildView object that was in use can be destroyed without Destroy()
   // ever being called on it.  So we also need to do a quick, safe cleanup
   // here (it's too late to just call Destroy(), which can cause crashes).
   // It's particularly important to make sure widgetDestroyed is called on our
   // mView -- this method NULLs mView's mGeckoChild, and NULL checks on
   // mGeckoChild are used throughout the ChildView class to tell if it's safe
   // to use a ChildView object.
   [mView widgetDestroyed]; // Safe if mView is nil.
   mParentWidget = nil;
   TearDownView(); // Safe if called twice.
 }
 void
 nsChildView::ReleaseTitlebarCGContext()
 {
   if (mTitlebarCGContext) {
     CGContextRelease(mTitlebarCGContext);
     mTitlebarCGContext = nullptr;
   }
 }
 NS_IMPL_ISUPPORTS_INHERITED(nsChildView, nsBaseWidget, nsIPluginWidget)
 nsresult nsChildView::Create(nsIWidget *aParent,
                              nsNativeWidget aNativeParent,
                              const nsIntRect &aRect,
                              nsDeviceContext *aContext,
                              nsWidgetInitData *aInitData)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   // Because the hidden window is created outside of an event loop,
   // we need to provide an autorelease pool to avoid leaking cocoa objects
   // (see bug 559075).
   nsAutoreleasePool localPool;
   // See NSView (MethodSwizzling) below.
   if (!gChildViewMethodsSwizzled) {
     nsToolkit::SwizzleMethods([NSView class], @selector(mouseDownCanMoveWindow),
                               @selector(nsChildView_NSView_mouseDownCanMoveWindow));
 #ifdef __LP64__
     if (nsCocoaFeatures::OnLionOrLater()) {
       nsToolkit::SwizzleMethods([NSEvent class], @selector(addLocalMonitorForEventsMatchingMask:handler:),
                                 @selector(nsChildView_NSEvent_addLocalMonitorForEventsMatchingMask:handler:),
                                 true);
       nsToolkit::SwizzleMethods([NSEvent class], @selector(removeMonitor:),
                                 @selector(nsChildView_NSEvent_removeMonitor:), true);
     }
 #else
     TextInputHandler::SwizzleMethods();
 #endif
     gChildViewMethodsSwizzled = true;
   }
   mBounds = aRect;
   // Ensure that the toolkit is created.
   nsToolkit::GetToolkit();
   BaseCreate(aParent, aRect, aContext, aInitData);
   // inherit things from the parent view and create our parallel
   // NSView in the Cocoa display system
   mParentView = nil;
   if (aParent) {
     // inherit the top-level window. NS_NATIVE_WIDGET is always a NSView
     // regardless of if we're asking a window or a view (for compatibility
     // with windows).
     mParentView = (NSView<mozView>*)aParent->GetNativeData(NS_NATIVE_WIDGET);
     mParentWidget = aParent;
   } else {
     // This is the normal case. When we're the root widget of the view hiararchy,
     // aNativeParent will be the contentView of our window, since that's what
     // nsCocoaWindow returns when asked for an NS_NATIVE_VIEW.
     mParentView = reinterpret_cast<NSView<mozView>*>(aNativeParent);
   }
   // create our parallel NSView and hook it up to our parent. Recall
   // that NS_NATIVE_WIDGET is the NSView.
   CGFloat scaleFactor = nsCocoaUtils::GetBackingScaleFactor(mParentView);
   NSRect r = nsCocoaUtils::DevPixelsToCocoaPoints(mBounds, scaleFactor);
   mView = [(NSView<mozView>*)CreateCocoaView(r) retain];
   if (!mView) {
     return NS_ERROR_FAILURE;
   }
   [(ChildView*)mView setIsPluginView:(mWindowType == eWindowType_plugin)];
   // If this view was created in a Gecko view hierarchy, the initial state
   // is hidden.  If the view is attached only to a native NSView but has
   // no Gecko parent (as in embedding), the initial state is visible.
   if (mParentWidget)
     [mView setHidden:YES];
   else
     mVisible = true;
   // Hook it up in the NSView hierarchy.
   if (mParentView) {
     [mParentView addSubview:mView];
   }
   // if this is a ChildView, make sure that our per-window data
   // is set up
   if ([mView isKindOfClass:[ChildView class]])
     [[WindowDataMap sharedWindowDataMap] ensureDataForWindow:[mView window]];
   NS_ASSERTION(!mTextInputHandler, "mTextInputHandler has already existed");
   mTextInputHandler = new TextInputHandler(this, mView);
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 // Creates the appropriate child view. Override to create something other than
 // our |ChildView| object. Autoreleases, so caller must retain.
 NSView*
 nsChildView::CreateCocoaView(NSRect inFrame)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
   return [[[ChildView alloc] initWithFrame:inFrame geckoChild:this] autorelease];
   NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
 }
 void nsChildView::TearDownView()
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (!mView)
     return;
   NSWindow* win = [mView window];
   NSResponder* responder = [win firstResponder];
   // We're being unhooked from the view hierarchy, don't leave our view
   // or a child view as the window first responder.
   if (responder && [responder isKindOfClass:[NSView class]] &&
       [(NSView*)responder isDescendantOf:mView]) {
     [win makeFirstResponder:[mView superview]];
   }
   // If mView is win's contentView, win (mView's NSWindow) "owns" mView --
   // win has retained mView, and will detach it from the view hierarchy and
   // release it when necessary (when win is itself destroyed (in a call to
   // [win dealloc])).  So all we need to do here is call [mView release] (to
   // match the call to [mView retain] in nsChildView::StandardCreate()).
   // Also calling [mView removeFromSuperviewWithoutNeedingDisplay] causes
   // mView to be released again and dealloced, while remaining win's
   // contentView.  So if we do that here, win will (for a short while) have
   // an invalid contentView (for the consequences see bmo bugs 381087 and
   // 374260).
   if ([mView isEqual:[win contentView]]) {
     [mView release];
   } else {
     // Stop NSView hierarchy being changed during [ChildView drawRect:]
     [mView performSelectorOnMainThread:@selector(delayedTearDown) withObject:nil waitUntilDone:false];
   }
   mView = nil;
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 nsCocoaWindow*
 nsChildView::GetXULWindowWidget()
 {
   id windowDelegate = [[mView window] delegate];
   if (windowDelegate && [windowDelegate isKindOfClass:[WindowDelegate class]]) {
     return [(WindowDelegate *)windowDelegate geckoWidget];
   }
   return nullptr;
 }
 NS_IMETHODIMP nsChildView::Destroy()
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   // Make sure that no composition is in progress while disconnecting
   // ourselves from the view.
   MutexAutoLock lock(mViewTearDownLock);
   if (mOnDestroyCalled)
     return NS_OK;
   mOnDestroyCalled = true;
   [mView widgetDestroyed];
   nsBaseWidget::Destroy();
   NotifyWindowDestroyed();
   mParentWidget = nil;
   TearDownView();
   nsBaseWidget::OnDestroy();
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 #pragma mark -
 #if 0
 static void PrintViewHierarchy(NSView *view)
 {
   while (view) {
     NSLog(@"  view is %x, frame %@", view, NSStringFromRect([view frame]));
     view = [view superview];
   }
 }
 #endif
 // Return native data according to aDataType
 void* nsChildView::GetNativeData(uint32_t aDataType)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSNULL;
   void* retVal = nullptr;
   switch (aDataType)
   {
     case NS_NATIVE_WIDGET:
     case NS_NATIVE_DISPLAY:
       retVal = (void*)mView;
       break;
     case NS_NATIVE_WINDOW:
       retVal = [mView window];
       break;
     case NS_NATIVE_GRAPHIC:
       NS_ERROR("Requesting NS_NATIVE_GRAPHIC on a Mac OS X child view!");
       retVal = nullptr;
       break;
     case NS_NATIVE_OFFSETX:
       retVal = 0;
       break;
     case NS_NATIVE_OFFSETY:
       retVal = 0;
       break;
     case NS_NATIVE_PLUGIN_PORT:
     case NS_NATIVE_PLUGIN_PORT_CG:
     {
       // The NP_CGContext pointer should always be NULL in the Cocoa event model.
       if ([(ChildView*)mView pluginEventModel] == NPEventModelCocoa)
         return nullptr;
       UpdatePluginPort();
       retVal = (void*)&mPluginCGContext;
       break;
     }
   }
   return retVal;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSNULL;
 }
 #pragma mark -
 nsTransparencyMode nsChildView::GetTransparencyMode()
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
   nsCocoaWindow* windowWidget = GetXULWindowWidget();
   return windowWidget ? windowWidget->GetTransparencyMode() : eTransparencyOpaque;
   NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(eTransparencyOpaque);
 }
 // This is called by nsContainerFrame on the root widget for all window types
 // except popup windows (when nsCocoaWindow::SetTransparencyMode is used instead).
 void nsChildView::SetTransparencyMode(nsTransparencyMode aMode)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   nsCocoaWindow* windowWidget = GetXULWindowWidget();
   if (windowWidget) {
     windowWidget->SetTransparencyMode(aMode);
   }
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 bool nsChildView::IsVisible() const
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
   if (!mVisible) {
     return mVisible;
   }
   // mVisible does not accurately reflect the state of a hidden tabbed view
   // so verify that the view has a window as well
   // then check native widget hierarchy visibility
   return ([mView window] != nil) && !NSIsEmptyRect([mView visibleRect]);
   NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(false);
 }
 void nsChildView::HidePlugin()
 {
   NS_ASSERTION(mWindowType == eWindowType_plugin,
                "HidePlugin called on non-plugin view");
 }
 void nsChildView::UpdatePluginPort()
 {
   NS_ASSERTION(mWindowType == eWindowType_plugin,
                "UpdatePluginPort called on non-plugin view");
   // [NSGraphicsContext currentContext] is supposed to "return the
   // current graphics context of the current thread."  But sometimes
   // (when called while mView isn't focused for drawing) it returns a
   // graphics context for the wrong window.  [window graphicsContext]
   // (which "provides the graphics context associated with the window
   // for the current thread") seems always to return the "right"
   // graphics context.  See bug 500130.
   mPluginCGContext.context = NULL;
   mPluginCGContext.window = NULL;
 }
 static void HideChildPluginViews(NSView* aView)
 {
   NSArray* subviews = [aView subviews];
   for (unsigned int i = 0; i < [subviews count]; ++i) {
     NSView* view = [subviews objectAtIndex: i];
     if (![view isKindOfClass:[ChildView class]])
       continue;
     ChildView* childview = static_cast<ChildView*>(view);
     if ([childview isPluginView]) {
       nsChildView* widget = static_cast<nsChildView*>([childview widget]);
       if (widget) {
         widget->HidePlugin();
       }
     } else {
       HideChildPluginViews(view);
     }
   }
 }
 // Some NSView methods (e.g. setFrame and setHidden) invalidate the view's
 // bounds in our window. However, we don't want these invalidations because
 // they are unnecessary and because they actually slow us down since we
 // block on the compositor inside drawRect.
 // When we actually need something invalidated, there will be an explicit call
 // to Invalidate from Gecko, so turning these automatic invalidations off
 // won't hurt us in the non-OMTC case.
 // The invalidations inside these NSView methods happen via a call to the
 // private method -[NSWindow _setNeedsDisplayInRect:]. Our BaseWindow
 // implementation of that method is augmented to let us ignore those calls
 // using -[BaseWindow disable/enableSetNeedsDisplay].
 static void
 ManipulateViewWithoutNeedingDisplay(NSView* aView, void (^aCallback)())
 {
   BaseWindow* win = nil;
   if ([[aView window] isKindOfClass:[BaseWindow class]]) {
     win = (BaseWindow*)[aView window];
   }
   [win disableSetNeedsDisplay];
   aCallback();
   [win enableSetNeedsDisplay];
 }
 // Hide or show this component
 NS_IMETHODIMP nsChildView::Show(bool aState)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   if (aState != mVisible) {
     // Provide an autorelease pool because this gets called during startup
     // on the "hidden window", resulting in cocoa object leakage if there's
     // no pool in place.
     nsAutoreleasePool localPool;
     ManipulateViewWithoutNeedingDisplay(mView, ^{
       [mView setHidden:!aState];
     });
     mVisible = aState;
     if (!mVisible && IsPluginView())
       HidePlugin();
   }
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 // Change the parent of this widget
 NS_IMETHODIMP
 nsChildView::SetParent(nsIWidget* aNewParent)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   if (mOnDestroyCalled)
     return NS_OK;
   nsCOMPtr<nsIWidget> kungFuDeathGrip(this);
   if (mParentWidget) {
     mParentWidget->RemoveChild(this);
   }
   if (aNewParent) {
     ReparentNativeWidget(aNewParent);
   } else {
     [mView removeFromSuperview];
     mParentView = nil;
   }
   mParentWidget = aNewParent;
   if (mParentWidget) {
     mParentWidget->AddChild(this);
   }
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 NS_IMETHODIMP
 nsChildView::ReparentNativeWidget(nsIWidget* aNewParent)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   NS_PRECONDITION(aNewParent, "");
   if (mOnDestroyCalled)
     return NS_OK;
   NSView<mozView>* newParentView =
    (NSView<mozView>*)aNewParent->GetNativeData(NS_NATIVE_WIDGET);
   NS_ENSURE_TRUE(newParentView, NS_ERROR_FAILURE);
   // we hold a ref to mView, so this is safe
   [mView removeFromSuperview];
   mParentView = newParentView;
   [mParentView addSubview:mView];
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 void nsChildView::ResetParent()
 {
   if (!mOnDestroyCalled) {
     if (mParentWidget)
       mParentWidget->RemoveChild(this);
     if (mView)
       [mView removeFromSuperview];
   }
   mParentWidget = nullptr;
 }
 nsIWidget*
 nsChildView::GetParent()
 {
   return mParentWidget;
 }
 float
 nsChildView::GetDPI()
 {
   NSWindow* window = [mView window];
   if (window && [window isKindOfClass:[BaseWindow class]]) {
     return [(BaseWindow*)window getDPI];
   }
   return 96.0;
 }
 NS_IMETHODIMP nsChildView::Enable(bool aState)
 {
   return NS_OK;
 }
 bool nsChildView::IsEnabled() const
 {
   return true;
 }
 NS_IMETHODIMP nsChildView::SetFocus(bool aRaise)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   NSWindow* window = [mView window];
   if (window)
     [window makeFirstResponder:mView];
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 // Override to set the cursor on the mac
 NS_IMETHODIMP nsChildView::SetCursor(nsCursor aCursor)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   if ([mView isDragInProgress])
     return NS_OK; // Don't change the cursor during dragging.
   nsBaseWidget::SetCursor(aCursor);
   return [[nsCursorManager sharedInstance] setCursor:aCursor];
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 // implement to fix "hidden virtual function" warning
 NS_IMETHODIMP nsChildView::SetCursor(imgIContainer* aCursor,
                                       uint32_t aHotspotX, uint32_t aHotspotY)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   nsBaseWidget::SetCursor(aCursor, aHotspotX, aHotspotY);
   return [[nsCursorManager sharedInstance] setCursorWithImage:aCursor hotSpotX:aHotspotX hotSpotY:aHotspotY scaleFactor:BackingScaleFactor()];
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 #pragma mark -
 // Get this component dimension
 NS_IMETHODIMP nsChildView::GetBounds(nsIntRect &aRect)
 {
   if (!mView) {
     aRect = mBounds;
   } else {
     aRect = CocoaPointsToDevPixels([mView frame]);
   }
   return NS_OK;
 }
 NS_IMETHODIMP nsChildView::GetClientBounds(nsIntRect &aRect)
 {
   GetBounds(aRect);
   if (!mParentWidget) {
     // For top level widgets we want the position on screen, not the position
     // of this view inside the window.
     MOZ_ASSERT(mWindowType != eWindowType_plugin, "plugin widgets should have parents");
     aRect.MoveTo(WidgetToScreenOffset());
   }
   return NS_OK;
 }
 NS_IMETHODIMP nsChildView::GetScreenBounds(nsIntRect &aRect)
 {
   GetBounds(aRect);
   aRect.MoveTo(WidgetToScreenOffset());
   return NS_OK;
 }
 double
 nsChildView::GetDefaultScaleInternal()
 {
   return BackingScaleFactor();
 }
 CGFloat
 nsChildView::BackingScaleFactor()
 {
   if (mBackingScaleFactor > 0.0) {
     return mBackingScaleFactor;
   }
   if (!mView) {
     return 1.0;
   }
   mBackingScaleFactor = nsCocoaUtils::GetBackingScaleFactor(mView);
   return mBackingScaleFactor;
 }
 void
 nsChildView::BackingScaleFactorChanged()
 {
   CGFloat newScale = nsCocoaUtils::GetBackingScaleFactor(mView);
   // ignore notification if it hasn't really changed (or maybe we have
   // disabled HiDPI mode via prefs)
   if (mBackingScaleFactor == newScale) {
     return;
   }
   mBackingScaleFactor = newScale;
   if (mWidgetListener && !mWidgetListener->GetXULWindow()) {
     nsIPresShell* presShell = mWidgetListener->GetPresShell();
     if (presShell) {
       presShell->BackingScaleFactorChanged();
     }
   }
   if (IsPluginView()) {
     nsEventStatus status = nsEventStatus_eIgnore;
     WidgetGUIEvent guiEvent(true, NS_PLUGIN_RESOLUTION_CHANGED, this);
     guiEvent.time = PR_IntervalNow();
     DispatchEvent(&guiEvent, status);
   }
 }
 int32_t
 nsChildView::RoundsWidgetCoordinatesTo()
 {
   if (BackingScaleFactor() == 2.0) {
     return 2;
   }
   return 1;
 }
 NS_IMETHODIMP nsChildView::ConstrainPosition(bool aAllowSlop,
                                              int32_t *aX, int32_t *aY)
 {
   return NS_OK;
 }
 // Move this component, aX and aY are in the parent widget coordinate system
 NS_IMETHODIMP nsChildView::Move(double aX, double aY)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   int32_t x = NSToIntRound(aX);
   int32_t y = NSToIntRound(aY);
   if (!mView || (mBounds.x == x && mBounds.y == y))
     return NS_OK;
   mBounds.x = x;
   mBounds.y = y;
   ManipulateViewWithoutNeedingDisplay(mView, ^{
     [mView setFrame:DevPixelsToCocoaPoints(mBounds)];
   });
   NotifyRollupGeometryChange();
   ReportMoveEvent();
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 NS_IMETHODIMP nsChildView::Resize(double aWidth, double aHeight, bool aRepaint)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   int32_t width = NSToIntRound(aWidth);
   int32_t height = NSToIntRound(aHeight);
   if (!mView || (mBounds.width == width && mBounds.height == height))
     return NS_OK;
   mBounds.width  = width;
   mBounds.height = height;
   ManipulateViewWithoutNeedingDisplay(mView, ^{
     [mView setFrame:DevPixelsToCocoaPoints(mBounds)];
   });
   if (mVisible && aRepaint)
     [mView setNeedsDisplay:YES];
   NotifyRollupGeometryChange();
   ReportSizeEvent();
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 NS_IMETHODIMP nsChildView::Resize(double aX, double aY,
                                   double aWidth, double aHeight, bool aRepaint)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   int32_t x = NSToIntRound(aX);
   int32_t y = NSToIntRound(aY);
   int32_t width = NSToIntRound(aWidth);
   int32_t height = NSToIntRound(aHeight);
   BOOL isMoving = (mBounds.x != x || mBounds.y != y);
   BOOL isResizing = (mBounds.width != width || mBounds.height != height);
   if (!mView || (!isMoving && !isResizing))
     return NS_OK;
   if (isMoving) {
     mBounds.x = x;
     mBounds.y = y;
   }
   if (isResizing) {
     mBounds.width  = width;
     mBounds.height = height;
   }
   ManipulateViewWithoutNeedingDisplay(mView, ^{
     [mView setFrame:DevPixelsToCocoaPoints(mBounds)];
   });
   if (mVisible && aRepaint)
     [mView setNeedsDisplay:YES];
   NotifyRollupGeometryChange();
   if (isMoving) {
     ReportMoveEvent();
     if (mOnDestroyCalled)
       return NS_OK;
   }
   if (isResizing)
     ReportSizeEvent();
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 static const int32_t resizeIndicatorWidth = 15;
 static const int32_t resizeIndicatorHeight = 15;
 bool nsChildView::ShowsResizeIndicator(nsIntRect* aResizerRect)
 {
   NSView *topLevelView = mView, *superView = nil;
   while ((superView = [topLevelView superview]))
     topLevelView = superView;
   if (![[topLevelView window] showsResizeIndicator] ||
       !([[topLevelView window] styleMask] & NSResizableWindowMask))
     return false;
   if (aResizerRect) {
     NSSize bounds = [topLevelView bounds].size;
     NSPoint corner = NSMakePoint(bounds.width, [topLevelView isFlipped] ? bounds.height : 0);
     corner = [topLevelView convertPoint:corner toView:mView];
     aResizerRect->SetRect(NSToIntRound(corner.x) - resizeIndicatorWidth,
                           NSToIntRound(corner.y) - resizeIndicatorHeight,
                           resizeIndicatorWidth, resizeIndicatorHeight);
   }
   return true;
 }
 // In QuickDraw mode the coordinate system used here should be that of the
 // browser window's content region (defined as everything but the 22-pixel
 // high titlebar).  But in CoreGraphics mode the coordinate system should be
 // that of the browser window as a whole (including its titlebar).  Both
 // coordinate systems have a top-left origin.  See bmo bug 474491.
 //
 // There's a bug in this method's code -- it currently uses the QuickDraw
 // coordinate system for both the QuickDraw and CoreGraphics drawing modes.
 // This bug is fixed by the patch for bug 474491.  But the Flash plugin (both
 // version 10.0.12.36 from Adobe and version 9.0 r151 from Apple) has Mozilla-
 // specific code to work around this bug, which breaks when we fix it (see bmo
 // bug 477077).  So we'll need to coordinate releasing a fix for this bug with
 // Adobe and other major plugin vendors that support the CoreGraphics mode.
 //
 // outClipRect and outOrigin are in display pixels, not device pixels.
 NS_IMETHODIMP nsChildView::GetPluginClipRect(nsIntRect& outClipRect, nsIntPoint& outOrigin, bool& outWidgetVisible)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   NS_ASSERTION(mWindowType == eWindowType_plugin,
                "GetPluginClipRect must only be called on a plugin widget");
   if (mWindowType != eWindowType_plugin) return NS_ERROR_FAILURE;
   NSWindow* window = [mView window];
   if (!window) return NS_ERROR_FAILURE;
   NSPoint viewOrigin = [mView convertPoint:NSZeroPoint toView:nil];
   NSRect frame = [[window contentView] frame];
   viewOrigin.y = frame.size.height - viewOrigin.y;
   // set up the clipping region for plugins.
   NSRect visibleBounds = [mView visibleRect];
   NSPoint clipOrigin   = [mView convertPoint:visibleBounds.origin toView:nil];
   // Convert from cocoa to QuickDraw coordinates
   clipOrigin.y = frame.size.height - clipOrigin.y;
   outClipRect.x = NSToIntRound(clipOrigin.x);
   outClipRect.y = NSToIntRound(clipOrigin.y);
   // need to convert view's origin to window coordinates.
   // then, encode as "SetOrigin" ready values.
   outOrigin.x = -NSToIntRound(viewOrigin.x);
   outOrigin.y = -NSToIntRound(viewOrigin.y);
   if (IsVisible() && [mView window] != nil) {
     outClipRect.width  = NSToIntRound(visibleBounds.origin.x + visibleBounds.size.width) - NSToIntRound(visibleBounds.origin.x);
     outClipRect.height = NSToIntRound(visibleBounds.origin.y + visibleBounds.size.height) - NSToIntRound(visibleBounds.origin.y);
     if (mClipRects) {
       nsIntRect clipBounds;
       for (uint32_t i = 0; i < mClipRectCount; ++i) {
         NSRect cocoaPoints = DevPixelsToCocoaPoints(mClipRects[i]);
         clipBounds.UnionRect(clipBounds, nsIntRect(NSToIntRound(cocoaPoints.origin.x),
                                                    NSToIntRound(cocoaPoints.origin.y),
                                                    NSToIntRound(cocoaPoints.size.width),
                                                    NSToIntRound(cocoaPoints.size.height)));
       }
       outClipRect.IntersectRect(outClipRect, clipBounds - outOrigin);
     }
     // XXXroc should this be !outClipRect.IsEmpty()?
     outWidgetVisible = true;
   }
   else {
     outClipRect.width = 0;
     outClipRect.height = 0;
     outWidgetVisible = false;
   }
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 NS_IMETHODIMP nsChildView::StartDrawPlugin()
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   NS_ASSERTION(mWindowType == eWindowType_plugin,
                "StartDrawPlugin must only be called on a plugin widget");
   if (mWindowType != eWindowType_plugin) return NS_ERROR_FAILURE;
   // This code is necessary for CoreGraphics in 32-bit builds.
   // See comments below about why. In 64-bit CoreGraphics mode we will not keep
   // this region up to date, plugins should not depend on it.
 #ifndef __LP64__
   NSWindow* window = [mView window];
   if (!window)
     return NS_ERROR_FAILURE;
   // In QuickDraw drawing mode we used to prevent reentrant handling of any
   // plugin event. But in CoreGraphics drawing mode only do this if the current
   // plugin event isn't an update/paint event.  This allows popupcontextmenu()
   // to work properly from a plugin that supports the Cocoa event model,
   // without regressing bug 409615.  See bug 435041.  (StartDrawPlugin() and
   // EndDrawPlugin() wrap every call to nsIPluginInstance::HandleEvent() --
   // not just calls that "draw" or paint.)
   if (mIsDispatchPaint && mPluginDrawing) {
     return NS_ERROR_FAILURE;
   }
   // It appears that the WindowRef from which we get the plugin port undergoes the
   // traditional BeginUpdate/EndUpdate cycle, which, if you recall, sets the visible
   // region to the intersection of the visible region and the update region. Since
   // we don't know here if we're being drawn inside a BeginUpdate/EndUpdate pair
   // (which seem to occur in [NSWindow display]), and we don't want to have the burden
   // of correctly doing Carbon invalidates of the plugin rect, we manually set the
   // visible region to be the entire port every time. It is necessary to set up our
   // window's port even for CoreGraphics plugins, because they may still use Carbon
   // internally (see bug #420527 for details).
   //
   // Don't use this code if any of the QuickDraw APIs it currently requires are
   // missing (as they probably will be on OS X 10.8 and up).
   if (::NewRgn && ::GetQDGlobalsThePort && ::GetGWorld && ::SetGWorld &&
       ::IsPortOffscreen && ::GetMainDevice && ::SetOrigin && ::RectRgn &&
       ::SetPortVisibleRegion && ::SetPortClipRegion && ::DisposeRgn) {
     RgnHandle pluginRegion = ::NewRgn();
     if (pluginRegion) {
       CGrafPtr port = ::GetWindowPort(WindowRef([window windowRef]));
       bool portChanged = (port != CGrafPtr(::GetQDGlobalsThePort()));
       CGrafPtr oldPort;
       GDHandle oldDevice;
       if (portChanged) {
         ::GetGWorld(&oldPort, &oldDevice);
         ::SetGWorld(port, ::IsPortOffscreen(port) ? nullptr : ::GetMainDevice());
       }
       ::SetOrigin(0, 0);
       nsIntRect clipRect; // this is in native window coordinates
       nsIntPoint origin;
       bool visible;
       GetPluginClipRect(clipRect, origin, visible);
       // XXX if we're not visible, set an empty clip region?
       Rect pluginRect;
       ConvertGeckoRectToMacRect(clipRect, pluginRect);
       ::RectRgn(pluginRegion, &pluginRect);
       ::SetPortVisibleRegion(port, pluginRegion);
       ::SetPortClipRegion(port, pluginRegion);
       // now set up the origin for the plugin
       ::SetOrigin(origin.x, origin.y);
       ::DisposeRgn(pluginRegion);
       if (portChanged) {
         ::SetGWorld(oldPort, oldDevice);
       }
     }
   }
 #endif
   mPluginDrawing = true;
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 NS_IMETHODIMP nsChildView::EndDrawPlugin()
 {
   NS_ASSERTION(mWindowType == eWindowType_plugin,
                "EndDrawPlugin must only be called on a plugin widget");
   if (mWindowType != eWindowType_plugin) return NS_ERROR_FAILURE;
   mPluginDrawing = false;
   return NS_OK;
 }
 NS_IMETHODIMP nsChildView::SetPluginInstanceOwner(nsIPluginInstanceOwner* aInstanceOwner)
 {
   mPluginInstanceOwner = aInstanceOwner;
   return NS_OK;
 }
 NS_IMETHODIMP nsChildView::SetPluginEventModel(int inEventModel)
 {
   [(ChildView*)mView setPluginEventModel:(NPEventModel)inEventModel];
   return NS_OK;
 }
 NS_IMETHODIMP nsChildView::GetPluginEventModel(int* outEventModel)
 {
   *outEventModel = [(ChildView*)mView pluginEventModel];
   return NS_OK;
 }
 NS_IMETHODIMP nsChildView::SetPluginDrawingModel(int inDrawingModel)
 {
   [(ChildView*)mView setPluginDrawingModel:(NPDrawingModel)inDrawingModel];
   return NS_OK;
 }
 NS_IMETHODIMP nsChildView::StartComplexTextInputForCurrentEvent()
 {
   return mTextInputHandler->StartComplexTextInputForCurrentEvent();
 }
 nsresult nsChildView::SynthesizeNativeKeyEvent(int32_t aNativeKeyboardLayout,
                                                int32_t aNativeKeyCode,
                                                uint32_t aModifierFlags,
                                                const nsAString& aCharacters,
                                                const nsAString& aUnmodifiedCharacters)
 {
   return mTextInputHandler->SynthesizeNativeKeyEvent(aNativeKeyboardLayout,
                                                      aNativeKeyCode,
                                                      aModifierFlags,
                                                      aCharacters,
                                                      aUnmodifiedCharacters);
 }
 nsresult nsChildView::SynthesizeNativeMouseEvent(nsIntPoint aPoint,
                                                  uint32_t aNativeMessage,
                                                  uint32_t aModifierFlags)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   NSPoint pt =
     nsCocoaUtils::DevPixelsToCocoaPoints(aPoint, BackingScaleFactor());
   // Move the mouse cursor to the requested position and reconnect it to the mouse.
   CGWarpMouseCursorPosition(NSPointToCGPoint(pt));
   CGAssociateMouseAndMouseCursorPosition(true);
   // aPoint is given with the origin on the top left, but convertScreenToBase
   // expects a point in a coordinate system that has its origin on the bottom left.
   NSPoint screenPoint = NSMakePoint(pt.x, nsCocoaUtils::FlippedScreenY(pt.y));
   NSPoint windowPoint = [[mView window] convertScreenToBase:screenPoint];
   NSEvent* event = [NSEvent mouseEventWithType:(NSEventType)aNativeMessage
                                       location:windowPoint
                                  modifierFlags:aModifierFlags
                                      timestamp:[NSDate timeIntervalSinceReferenceDate]
                                   windowNumber:[[mView window] windowNumber]
                                        context:nil
                                    eventNumber:0
                                     clickCount:1
                                       pressure:0.0];
   if (!event)
     return NS_ERROR_FAILURE;
   if ([[mView window] isKindOfClass:[BaseWindow class]]) {
     // Tracking area events don't end up in their tracking areas when sent
     // through [NSApp sendEvent:], so pass them directly to the right methods.
     BaseWindow* window = (BaseWindow*)[mView window];
     if (aNativeMessage == NSMouseEntered) {
       [window mouseEntered:event];
       return NS_OK;
     }
     if (aNativeMessage == NSMouseExited) {
       [window mouseExited:event];
       return NS_OK;
     }
     if (aNativeMessage == NSMouseMoved) {
       [window mouseMoved:event];
       return NS_OK;
     }
   }
   [NSApp sendEvent:event];
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 // First argument has to be an NSMenu representing the application's top-level
 // menu bar. The returned item is *not* retained.
 static NSMenuItem* NativeMenuItemWithLocation(NSMenu* menubar, NSString* locationString)
 {
   NSArray* indexes = [locationString componentsSeparatedByString:@"|"];
   unsigned int indexCount = [indexes count];
   if (indexCount == 0)
     return nil;
   NSMenu* currentSubmenu = [NSApp mainMenu];
   for (unsigned int i = 0; i < indexCount; i++) {
     int targetIndex;
     // We remove the application menu from consideration for the top-level menu
     if (i == 0)
       targetIndex = [[indexes objectAtIndex:i] intValue] + 1;
     else
       targetIndex = [[indexes objectAtIndex:i] intValue];
     int itemCount = [currentSubmenu numberOfItems];
     if (targetIndex < itemCount) {
       NSMenuItem* menuItem = [currentSubmenu itemAtIndex:targetIndex];
       // if this is the last index just return the menu item
       if (i == (indexCount - 1))
         return menuItem;
       // if this is not the last index find the submenu and keep going
       if ([menuItem hasSubmenu])
         currentSubmenu = [menuItem submenu];
       else
         return nil;
     }
   }
   return nil;
 }
 // Used for testing native menu system structure and event handling.
 NS_IMETHODIMP nsChildView::ActivateNativeMenuItemAt(const nsAString& indexString)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   NSString* locationString = [NSString stringWithCharacters:reinterpret_cast<const unichar*>(indexString.BeginReading())
                                                      length:indexString.Length()];
   NSMenuItem* item = NativeMenuItemWithLocation([NSApp mainMenu], locationString);
   // We can't perform an action on an item with a submenu, that will raise
   // an obj-c exception.
   if (item && ![item hasSubmenu]) {
     NSMenu* parent = [item menu];
     if (parent) {
       // NSLog(@"Performing action for native menu item titled: %@\n",
       //       [[currentSubmenu itemAtIndex:targetIndex] title]);
       [parent performActionForItemAtIndex:[parent indexOfItem:item]];
       return NS_OK;
     }
   }
   return NS_ERROR_FAILURE;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 // Used for testing native menu system structure and event handling.
 NS_IMETHODIMP nsChildView::ForceUpdateNativeMenuAt(const nsAString& indexString)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   nsCocoaWindow *widget = GetXULWindowWidget();
   if (widget) {
     nsMenuBarX* mb = widget->GetMenuBar();
     if (mb) {
       if (indexString.IsEmpty())
         mb->ForceNativeMenuReload();
       else
         mb->ForceUpdateNativeMenuAt(indexString);
     }
   }
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 #pragma mark -
 #ifdef INVALIDATE_DEBUGGING
 static Boolean KeyDown(const UInt8 theKey)
 {
   KeyMap map;
   GetKeys(map);
   return ((*((UInt8 *)map + (theKey >> 3)) >> (theKey & 7)) & 1) != 0;
 }
 static Boolean caps_lock()
 {
   return KeyDown(0x39);
 }
 static void blinkRect(Rect* r)
 {
   StRegionFromPool oldClip;
   if (oldClip != NULL)
     ::GetClip(oldClip);
   ::ClipRect(r);
   ::InvertRect(r);
   UInt32 end = ::TickCount() + 5;
   while (::TickCount() < end) ;
   ::InvertRect(r);
   if (oldClip != NULL)
     ::SetClip(oldClip);
 }
 static void blinkRgn(RgnHandle rgn)
 {
   StRegionFromPool oldClip;
   if (oldClip != NULL)
     ::GetClip(oldClip);
   ::SetClip(rgn);
   ::InvertRgn(rgn);
   UInt32 end = ::TickCount() + 5;
   while (::TickCount() < end) ;
   ::InvertRgn(rgn);
   if (oldClip != NULL)
     ::SetClip(oldClip);
 }
 #endif
 // Invalidate this component's visible area
 NS_IMETHODIMP nsChildView::Invalidate(const nsIntRect &aRect)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   if (!mView || !mVisible)
     return NS_OK;
   NS_ASSERTION(GetLayerManager()->GetBackendType() != LayersBackend::LAYERS_CLIENT,
                "Shouldn't need to invalidate with accelerated OMTC layers!");
   if ([NSView focusView]) {
     // if a view is focussed (i.e. being drawn), then postpone the invalidate so that we
     // don't lose it.
     [mView setNeedsPendingDisplayInRect:DevPixelsToCocoaPoints(aRect)];
   }
   else {
     [mView setNeedsDisplayInRect:DevPixelsToCocoaPoints(aRect)];
   }
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 bool
 nsChildView::ComputeShouldAccelerate(bool aDefault)
 {
   // Don't use OpenGL for transparent windows or for popup windows.
   if (!mView || ![[mView window] isOpaque] ||
       [[mView window] isKindOfClass:[PopupWindow class]])
     return false;
   return nsBaseWidget::ComputeShouldAccelerate(aDefault);
 }
 bool
 nsChildView::ShouldUseOffMainThreadCompositing()
 {
   // Don't use OMTC for transparent windows or for popup windows.
   if (!mView || ![[mView window] isOpaque] ||
       [[mView window] isKindOfClass:[PopupWindow class]])
     return false;
   return nsBaseWidget::ShouldUseOffMainThreadCompositing();
 }
 inline uint16_t COLOR8TOCOLOR16(uint8_t color8)
 {
   // return (color8 == 0xFF ? 0xFFFF : (color8 << 8));
   return (color8 << 8) | color8;  /* (color8 * 257) == (color8 * 0x0101) */
 }
 #pragma mark -
 nsresult nsChildView::ConfigureChildren(const nsTArray<Configuration>& aConfigurations)
 {
   for (uint32_t i = 0; i < aConfigurations.Length(); ++i) {
     const Configuration& config = aConfigurations[i];
     nsChildView* child = static_cast<nsChildView*>(config.mChild);
 #ifdef DEBUG
     nsWindowType kidType = child->WindowType();
 #endif
     NS_ASSERTION(kidType == eWindowType_plugin,
                  "Configured widget is not a plugin type");
     NS_ASSERTION(child->GetParent() == this,
                  "Configured widget is not a child of the right widget");
     // nsIWidget::Show() doesn't get called on plugin widgets unless we call
     // it from here.  See bug 592563.
     child->Show(!config.mClipRegion.IsEmpty());
     child->Resize(
         config.mBounds.x, config.mBounds.y,
         config.mBounds.width, config.mBounds.height,
         false);
     // Store the clip region here in case GetPluginClipRect needs it.
     child->StoreWindowClipRegion(config.mClipRegion);
   }
   return NS_OK;
 }
 // Invokes callback and ProcessEvent methods on Event Listener object
 NS_IMETHODIMP nsChildView::DispatchEvent(WidgetGUIEvent* event,
                                          nsEventStatus& aStatus)
 {
 #ifdef DEBUG
   debug_DumpEvent(stdout, event->widget, event, nsAutoCString("something"), 0);
 #endif
   NS_ASSERTION(!(mTextInputHandler && mTextInputHandler->IsIMEComposing() &&
                  event->HasKeyEventMessage()),
     "Any key events should not be fired during IME composing");
   if (event->mFlags.mIsSynthesizedForTests) {
     WidgetKeyboardEvent* keyEvent = event->AsKeyboardEvent();
     if (keyEvent) {
       nsresult rv = mTextInputHandler->AttachNativeKeyEvent(*keyEvent);
       NS_ENSURE_SUCCESS(rv, rv);
     }
   }
   aStatus = nsEventStatus_eIgnore;
   nsIWidgetListener* listener = mWidgetListener;
   // If the listener is NULL, check if the parent is a popup. If it is, then
   // this child is the popup content view attached to a popup. Get the
   // listener from the parent popup instead.
   nsCOMPtr<nsIWidget> kungFuDeathGrip = do_QueryInterface(mParentWidget ? mParentWidget : this);
   if (!listener && mParentWidget) {
     if (mParentWidget->WindowType() == eWindowType_popup) {
       // Check just in case event->widget isn't this widget
       if (event->widget)
         listener = event->widget->GetWidgetListener();
       if (!listener) {
         event->widget = mParentWidget;
         listener = mParentWidget->GetWidgetListener();
       }
     }
   }
   if (listener)
     aStatus = listener->HandleEvent(event, mUseAttachedEvents);
   return NS_OK;
 }
 bool nsChildView::DispatchWindowEvent(WidgetGUIEvent& event)
 {
   nsEventStatus status;
   DispatchEvent(&event, status);
   return ConvertStatus(status);
 }
 nsIWidget*
 nsChildView::GetWidgetForListenerEvents()
 {
   // If there is no listener, use the parent popup's listener if that exists.
   if (!mWidgetListener && mParentWidget &&
       mParentWidget->WindowType() == eWindowType_popup) {
     return mParentWidget;
   }
   return this;
 }
 void nsChildView::WillPaintWindow()
 {
   nsCOMPtr<nsIWidget> widget = GetWidgetForListenerEvents();
   nsIWidgetListener* listener = widget->GetWidgetListener();
   if (listener) {
     listener->WillPaintWindow(widget);
   }
 }
 bool nsChildView::PaintWindow(nsIntRegion aRegion)
 {
   nsCOMPtr<nsIWidget> widget = GetWidgetForListenerEvents();
   nsIWidgetListener* listener = widget->GetWidgetListener();
   if (!listener)
     return false;
   bool returnValue = false;
   bool oldDispatchPaint = mIsDispatchPaint;
   mIsDispatchPaint = true;
   returnValue = listener->PaintWindow(widget, aRegion);
   listener = widget->GetWidgetListener();
   if (listener) {
     listener->DidPaintWindow();
   }
   mIsDispatchPaint = oldDispatchPaint;
   return returnValue;
 }
 #pragma mark -
 void nsChildView::ReportMoveEvent()
 {
    NotifyWindowMoved(mBounds.x, mBounds.y);
 }
 void nsChildView::ReportSizeEvent()
 {
   if (mWidgetListener)
     mWidgetListener->WindowResized(this, mBounds.width, mBounds.height);
 }
 #pragma mark -
 //    Return the offset between this child view and the screen.
 //    @return       -- widget origin in device-pixel coords
 nsIntPoint nsChildView::WidgetToScreenOffset()
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
   NSPoint origin = NSMakePoint(0, 0);
   // 1. First translate view origin point into window coords.
   // The returned point is in bottom-left coordinates.
   origin = [mView convertPoint:origin toView:nil];
   // 2. We turn the window-coord rect's origin into screen (still bottom-left) coords.
   origin = [[mView window] convertBaseToScreen:origin];
   // 3. Since we're dealing in bottom-left coords, we need to make it top-left coords
   //    before we pass it back to Gecko.
   FlipCocoaScreenCoordinate(origin);
   // convert to device pixels
   return CocoaPointsToDevPixels(origin);
   NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(nsIntPoint(0,0));
 }
 NS_IMETHODIMP nsChildView::CaptureRollupEvents(nsIRollupListener * aListener,
                                                bool aDoCapture)
 {
   // this never gets called, only top-level windows can be rollup widgets
   return NS_OK;
 }
 NS_IMETHODIMP nsChildView::SetTitle(const nsAString& title)
 {
   // child views don't have titles
   return NS_OK;
 }
 NS_IMETHODIMP nsChildView::GetAttention(int32_t aCycleCount)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   [NSApp requestUserAttention:NSInformationalRequest];
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 /* static */
 bool nsChildView::DoHasPendingInputEvent()
 {
   return sLastInputEventCount != GetCurrentInputEventCount();
 }
 /* static */
 uint32_t nsChildView::GetCurrentInputEventCount()
 {
   // Can't use kCGAnyInputEventType because that updates too rarely for us (and
   // always in increments of 30+!) and because apparently it's sort of broken
   // on Tiger.  So just go ahead and query the counters we care about.
   static const CGEventType eventTypes[] = {
     kCGEventLeftMouseDown,
     kCGEventLeftMouseUp,
     kCGEventRightMouseDown,
     kCGEventRightMouseUp,
     kCGEventMouseMoved,
     kCGEventLeftMouseDragged,
     kCGEventRightMouseDragged,
     kCGEventKeyDown,
     kCGEventKeyUp,
     kCGEventScrollWheel,
     kCGEventTabletPointer,
     kCGEventOtherMouseDown,
     kCGEventOtherMouseUp,
     kCGEventOtherMouseDragged
   };
   uint32_t eventCount = 0;
   for (uint32_t i = 0; i < ArrayLength(eventTypes); ++i) {
     eventCount +=
       CGEventSourceCounterForEventType(kCGEventSourceStateCombinedSessionState,
                                        eventTypes[i]);
   }
   return eventCount;
 }
 /* static */
 void nsChildView::UpdateCurrentInputEventCount()
 {
   sLastInputEventCount = GetCurrentInputEventCount();
 }
 bool nsChildView::HasPendingInputEvent()
 {
   return DoHasPendingInputEvent();
 }
 #pragma mark -
 NS_IMETHODIMP
 nsChildView::NotifyIME(const IMENotification& aIMENotification)
 {
   switch (aIMENotification.mMessage) {
     case REQUEST_TO_COMMIT_COMPOSITION:
       NS_ENSURE_TRUE(mTextInputHandler, NS_ERROR_NOT_AVAILABLE);
       mTextInputHandler->CommitIMEComposition();
       return NS_OK;
     case REQUEST_TO_CANCEL_COMPOSITION:
       NS_ENSURE_TRUE(mTextInputHandler, NS_ERROR_NOT_AVAILABLE);
       mTextInputHandler->CancelIMEComposition();
       return NS_OK;
     case NOTIFY_IME_OF_FOCUS:
       if (mInputContext.IsPasswordEditor()) {
         TextInputHandler::EnableSecureEventInput();
       }
       NS_ENSURE_TRUE(mTextInputHandler, NS_ERROR_NOT_AVAILABLE);
       mTextInputHandler->OnFocusChangeInGecko(true);
       return NS_OK;
     case NOTIFY_IME_OF_BLUR:
       // When we're going to be deactive, we must disable the secure event input
       // mode, see the Carbon Event Manager Reference.
       TextInputHandler::EnsureSecureEventInputDisabled();
       NS_ENSURE_TRUE(mTextInputHandler, NS_ERROR_NOT_AVAILABLE);
       mTextInputHandler->OnFocusChangeInGecko(false);
       return NS_OK;
     case NOTIFY_IME_OF_SELECTION_CHANGE:
       NS_ENSURE_TRUE(mTextInputHandler, NS_ERROR_NOT_AVAILABLE);
       mTextInputHandler->OnSelectionChange();
     default:
       return NS_ERROR_NOT_IMPLEMENTED;
   }
 }
 NS_IMETHODIMP_(void)
 nsChildView::SetInputContext(const InputContext& aContext,
                              const InputContextAction& aAction)
 {
   NS_ENSURE_TRUE_VOID(mTextInputHandler);
   if (mTextInputHandler->IsFocused()) {
     if (aContext.IsPasswordEditor()) {
       TextInputHandler::EnableSecureEventInput();
     } else {
       TextInputHandler::EnsureSecureEventInputDisabled();
     }
   }
   mInputContext = aContext;
   switch (aContext.mIMEState.mEnabled) {
     case IMEState::ENABLED:
     case IMEState::PLUGIN:
       mTextInputHandler->SetASCIICapableOnly(false);
       mTextInputHandler->EnableIME(true);
       if (mInputContext.mIMEState.mOpen != IMEState::DONT_CHANGE_OPEN_STATE) {
         mTextInputHandler->SetIMEOpenState(
           mInputContext.mIMEState.mOpen == IMEState::OPEN);
       }
       break;
     case IMEState::DISABLED:
       mTextInputHandler->SetASCIICapableOnly(false);
       mTextInputHandler->EnableIME(false);
       break;
     case IMEState::PASSWORD:
       mTextInputHandler->SetASCIICapableOnly(true);
       mTextInputHandler->EnableIME(false);
       break;
     default:
       NS_ERROR("not implemented!");
   }
 }
 NS_IMETHODIMP_(InputContext)
 nsChildView::GetInputContext()
 {
   switch (mInputContext.mIMEState.mEnabled) {
     case IMEState::ENABLED:
     case IMEState::PLUGIN:
       if (mTextInputHandler) {
         mInputContext.mIMEState.mOpen =
           mTextInputHandler->IsIMEOpened() ? IMEState::OPEN : IMEState::CLOSED;
         break;
       }
       // If mTextInputHandler is null, set CLOSED instead...
     default:
       mInputContext.mIMEState.mOpen = IMEState::CLOSED;
       break;
   }
   mInputContext.mNativeIMEContext = [mView inputContext];
   // If input context isn't available on this widget, we should set |this|
   // instead of nullptr since nullptr means that the platform has only one
   // context per process.
   if (!mInputContext.mNativeIMEContext) {
     mInputContext.mNativeIMEContext = this;
   }
   return mInputContext;
 }
 NS_IMETHODIMP
 nsChildView::AttachNativeKeyEvent(mozilla::WidgetKeyboardEvent& aEvent)
 {
   NS_ENSURE_TRUE(mTextInputHandler, NS_ERROR_NOT_AVAILABLE);
   return mTextInputHandler->AttachNativeKeyEvent(aEvent);
 }
 NS_IMETHODIMP_(bool)
 nsChildView::ExecuteNativeKeyBinding(NativeKeyBindingsType aType,
                                      const WidgetKeyboardEvent& aEvent,
                                      DoCommandCallback aCallback,
                                      void* aCallbackData)
 {
   NativeKeyBindings* keyBindings = NativeKeyBindings::GetInstance(aType);
   return keyBindings->Execute(aEvent, aCallback, aCallbackData);
 }
 nsIMEUpdatePreference
 nsChildView::GetIMEUpdatePreference()
 {
   return nsIMEUpdatePreference(nsIMEUpdatePreference::NOTIFY_SELECTION_CHANGE);
 }
 NS_IMETHODIMP nsChildView::GetToggledKeyState(uint32_t aKeyCode,
                                               bool* aLEDState)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   NS_ENSURE_ARG_POINTER(aLEDState);
   uint32_t key;
   switch (aKeyCode) {
     case NS_VK_CAPS_LOCK:
       key = alphaLock;
       break;
     case NS_VK_NUM_LOCK:
       key = kEventKeyModifierNumLockMask;
       break;
     // Mac doesn't support SCROLL_LOCK state.
     default:
       return NS_ERROR_NOT_IMPLEMENTED;
   }
   uint32_t modifierFlags = ::GetCurrentKeyModifiers();
   *aLEDState = (modifierFlags & key) != 0;
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 NSView<mozView>* nsChildView::GetEditorView()
 {
   NSView<mozView>* editorView = mView;
   // We need to get editor's view. E.g., when the focus is in the bookmark
   // dialog, the view is <panel> element of the dialog.  At this time, the key
   // events are processed the parent window's view that has native focus.
   WidgetQueryContentEvent textContent(true, NS_QUERY_TEXT_CONTENT, this);
   textContent.InitForQueryTextContent(0, 0);
   DispatchWindowEvent(textContent);
   if (textContent.mSucceeded && textContent.mReply.mFocusedWidget) {
     NSView<mozView>* view = static_cast<NSView<mozView>*>(
       textContent.mReply.mFocusedWidget->GetNativeData(NS_NATIVE_WIDGET));
     if (view)
       editorView = view;
   }
   return editorView;
 }
 #pragma mark -
 void
 nsChildView::CreateCompositor()
 {
   nsBaseWidget::CreateCompositor();
   if (mCompositorChild) {
     [(ChildView *)mView setUsingOMTCompositor:true];
   }
 }
 gfxASurface*
 nsChildView::GetThebesSurface()
 {
   if (!mTempThebesSurface) {
     mTempThebesSurface = new gfxQuartzSurface(gfxSize(1, 1), gfxImageFormat::ARGB32);
   }
   return mTempThebesSurface;
 }
 void
 nsChildView::NotifyDirtyRegion(const nsIntRegion& aDirtyRegion)
 {
   if ([(ChildView*)mView isCoveringTitlebar]) {
     // We store the dirty region so that we know what to repaint in the titlebar.
     mDirtyTitlebarRegion.Or(mDirtyTitlebarRegion, aDirtyRegion);
   }
 }
 nsIntRect
 nsChildView::RectContainingTitlebarControls()
 {
   // Start with a thin strip at the top of the window for the highlight line.
   NSRect rect = NSMakeRect(0, 0, [mView bounds].size.width,
                            [(ChildView*)mView cornerRadius]);
   // Add the rects of the titlebar controls.
   for (id view in [(BaseWindow*)[mView window] titlebarControls]) {
     rect = NSUnionRect(rect, [mView convertRect:[view bounds] fromView:view]);
   }
   return CocoaPointsToDevPixels(rect);
 }
 void
 nsChildView::PrepareWindowEffects()
 {
   MutexAutoLock lock(mEffectsLock);
   mShowsResizeIndicator = ShowsResizeIndicator(&mResizeIndicatorRect);
   mHasRoundedBottomCorners = [(ChildView*)mView hasRoundedBottomCorners];
   CGFloat cornerRadius = [(ChildView*)mView cornerRadius];
   mDevPixelCornerRadius = cornerRadius * BackingScaleFactor();
   mIsCoveringTitlebar = [(ChildView*)mView isCoveringTitlebar];
   mIsFullscreen = ([[mView window] styleMask] & NSFullScreenWindowMask) != 0;
   if (mIsCoveringTitlebar) {
     mTitlebarRect = RectContainingTitlebarControls();
     UpdateTitlebarCGContext();
   }
 }
 void
 nsChildView::CleanupWindowEffects()
 {
   mResizerImage = nullptr;
   mCornerMaskImage = nullptr;
   mTitlebarImage = nullptr;
 }
 bool
 nsChildView::PreRender(LayerManagerComposite* aManager)
 {
   nsAutoPtr<GLManager> manager(GLManager::CreateGLManager(aManager));
   if (!manager) {
     return true;
   }
   // The lock makes sure that we don't attempt to tear down the view while
   // compositing. That would make us unable to call postRender on it when the
   // composition is done, thus keeping the GL context locked forever.
   mViewTearDownLock.Lock();
   NSOpenGLContext *glContext = GLContextCGL::Cast(manager->gl())->GetNSOpenGLContext();
   if (![(ChildView*)mView preRender:glContext]) {
     mViewTearDownLock.Unlock();
     return false;
   }
   return true;
 }
 void
 nsChildView::PostRender(LayerManagerComposite* aManager)
 {
   nsAutoPtr<GLManager> manager(GLManager::CreateGLManager(aManager));
   if (!manager) {
     return;
   }
   NSOpenGLContext *glContext = GLContextCGL::Cast(manager->gl())->GetNSOpenGLContext();
   [(ChildView*)mView postRender:glContext];
   mViewTearDownLock.Unlock();
 }
 void
 nsChildView::DrawWindowOverlay(LayerManagerComposite* aManager, nsIntRect aRect)
 {
   nsAutoPtr<GLManager> manager(GLManager::CreateGLManager(aManager));
   if (manager) {
     DrawWindowOverlay(manager, aRect);
   }
 }
 void
 nsChildView::DrawWindowOverlay(GLManager* aManager, nsIntRect aRect)
 {
   GLContext* gl = aManager->gl();
   ScopedGLState scopedScissorTestState(gl, LOCAL_GL_SCISSOR_TEST, false);
   MaybeDrawTitlebar(aManager, aRect);
   MaybeDrawResizeIndicator(aManager, aRect);
   MaybeDrawRoundedCorners(aManager, aRect);
 }
 static void
 ClearRegion(gfx::DrawTarget *aDT, nsIntRegion aRegion)
 {
   gfxUtils::ClipToRegion(aDT, aRegion);
   aDT->ClearRect(gfx::Rect(0, 0, aDT->GetSize().width, aDT->GetSize().height));
   aDT->PopClip();
 }
 static void
 DrawResizer(CGContextRef aCtx)
 {
   CGContextSetShouldAntialias(aCtx, false);
   CGPoint points[6];
   points[0] = CGPointMake(13.0f, 4.0f);
   points[1] = CGPointMake(3.0f, 14.0f);
   points[2] = CGPointMake(13.0f, 8.0f);
   points[3] = CGPointMake(7.0f, 14.0f);
   points[4] = CGPointMake(13.0f, 12.0f);
   points[5] = CGPointMake(11.0f, 14.0f);
   CGContextSetRGBStrokeColor(aCtx, 0.00f, 0.00f, 0.00f, 0.15f);
   CGContextStrokeLineSegments(aCtx, points, 6);
   points[0] = CGPointMake(13.0f, 5.0f);
   points[1] = CGPointMake(4.0f, 14.0f);
   points[2] = CGPointMake(13.0f, 9.0f);
   points[3] = CGPointMake(8.0f, 14.0f);
   points[4] = CGPointMake(13.0f, 13.0f);
   points[5] = CGPointMake(12.0f, 14.0f);
   CGContextSetRGBStrokeColor(aCtx, 0.13f, 0.13f, 0.13f, 0.54f);
   CGContextStrokeLineSegments(aCtx, points, 6);
   points[0] = CGPointMake(13.0f, 6.0f);
   points[1] = CGPointMake(5.0f, 14.0f);
   points[2] = CGPointMake(13.0f, 10.0f);
   points[3] = CGPointMake(9.0f, 14.0f);
   points[5] = CGPointMake(13.0f, 13.9f);
   points[4] = CGPointMake(13.0f, 14.0f);
   CGContextSetRGBStrokeColor(aCtx, 0.84f, 0.84f, 0.84f, 0.55f);
   CGContextStrokeLineSegments(aCtx, points, 6);
 }
 void
 nsChildView::MaybeDrawResizeIndicator(GLManager* aManager, const nsIntRect& aRect)
 {
   MutexAutoLock lock(mEffectsLock);
   if (!mShowsResizeIndicator) {
     return;
   }
   if (!mResizerImage) {
     mResizerImage = new RectTextureImage(aManager->gl());
   }
   nsIntSize size = mResizeIndicatorRect.Size();
   mResizerImage->UpdateIfNeeded(size, nsIntRegion(), ^(gfx::DrawTarget* drawTarget, const nsIntRegion& updateRegion) {
     ClearRegion(drawTarget, updateRegion);
     gfx::BorrowedCGContext borrow(drawTarget);
     DrawResizer(borrow.cg);
     borrow.Finish();
   });
   mResizerImage->Draw(aManager, mResizeIndicatorRect.TopLeft());
 }
 // Draw the highlight line at the top of the titlebar.
 // This function draws into the current NSGraphicsContext and assumes flippedness.
 static void
 DrawTitlebarHighlight(NSSize aWindowSize, CGFloat aRadius, CGFloat aDevicePixelWidth)
 {
   [NSGraphicsContext saveGraphicsState];
   // Set up the clip path. We start with the outer rectangle and cut out a
   // slightly smaller inner rectangle with rounded corners.
   // The outer corners of the resulting path will be square, but they will be
   // masked away in a later step.
   NSBezierPath* path = [NSBezierPath bezierPath];
   [path setWindingRule:NSEvenOddWindingRule];
   NSRect pathRect = NSMakeRect(0, 0, aWindowSize.width, aRadius + 2);
   [path appendBezierPathWithRect:pathRect];
   pathRect = NSInsetRect(pathRect, aDevicePixelWidth, aDevicePixelWidth);
   CGFloat innerRadius = aRadius - aDevicePixelWidth;
   [path appendBezierPathWithRoundedRect:pathRect xRadius:innerRadius yRadius:innerRadius];
   [path addClip];
   // Now we fill the path with a subtle highlight gradient.
   // We don't use NSGradient because it's 5x to 15x slower than the manual fill,
   // as indicated by the performance test in bug 880620.
   for (CGFloat y = 0; y < aRadius; y += aDevicePixelWidth) {
     CGFloat t = y / aRadius;
     [[NSColor colorWithDeviceWhite:1.0 alpha:0.4 * (1.0 - t)] set];
     NSRectFill(NSMakeRect(0, y, aWindowSize.width, aDevicePixelWidth));
   }
   [NSGraphicsContext restoreGraphicsState];
 }
 static CGContextRef
 CreateCGContext(const nsIntSize& aSize)
 {
   CGColorSpaceRef cs = CGColorSpaceCreateDeviceRGB();
   CGContextRef ctx =
     CGBitmapContextCreate(NULL,
                           aSize.width,
                           aSize.height,
 /* bitsPerComponent */,
                           aSize.width * 4,
                           cs,
                           kCGBitmapByteOrder32Host | kCGImageAlphaPremultipliedFirst);
   CGColorSpaceRelease(cs);
   CGContextTranslateCTM(ctx, 0, aSize.height);
   CGContextScaleCTM(ctx, 1, -1);
   CGContextSetInterpolationQuality(ctx, kCGInterpolationLow);
   return ctx;
 }
 // When this method is entered, mEffectsLock is already being held.
 void
 nsChildView::UpdateTitlebarCGContext()
 {
   nsIntRegion dirtyTitlebarRegion;
   dirtyTitlebarRegion.And(mDirtyTitlebarRegion, mTitlebarRect);
   mDirtyTitlebarRegion.SetEmpty();
   nsIntSize texSize = RectTextureImage::TextureSizeForSize(mTitlebarRect.Size());
   if (!mTitlebarCGContext ||
       CGBitmapContextGetWidth(mTitlebarCGContext) != size_t(texSize.width) ||
       CGBitmapContextGetHeight(mTitlebarCGContext) != size_t(texSize.height)) {
     dirtyTitlebarRegion = mTitlebarRect;
     ReleaseTitlebarCGContext();
     mTitlebarCGContext = CreateCGContext(texSize);
   }
   if (dirtyTitlebarRegion.IsEmpty())
     return;
   CGContextRef ctx = mTitlebarCGContext;
   CGContextSaveGState(ctx);
   std::vector<CGRect> rects;
   nsIntRegionRectIterator iter(dirtyTitlebarRegion);
   for (;;) {
     const nsIntRect* r = iter.Next();
     if (!r)
       break;
     rects.push_back(CGRectMake(r->x, r->y, r->width, r->height));
   }
   CGContextClipToRects(ctx, rects.data(), rects.size());
   CGContextClearRect(ctx, CGRectMake(0, 0, texSize.width, texSize.height));
   double scale = BackingScaleFactor();
   CGContextScaleCTM(ctx, scale, scale);
   NSGraphicsContext* oldContext = [NSGraphicsContext currentContext];
   CGContextSaveGState(ctx);
   BaseWindow* window = (BaseWindow*)[mView window];
   NSView* frameView = [[window contentView] superview];
   if (![frameView isFlipped]) {
     CGContextTranslateCTM(ctx, 0, [frameView bounds].size.height);
     CGContextScaleCTM(ctx, 1, -1);
   }
   NSGraphicsContext* context = [NSGraphicsContext graphicsContextWithGraphicsPort:ctx flipped:[frameView isFlipped]];
   [NSGraphicsContext setCurrentContext:context];
   // Draw the title string.
   if ([window wantsTitleDrawn] && [frameView respondsToSelector:@selector(_drawTitleBar:)]) {
     [frameView _drawTitleBar:[frameView bounds]];
   }
   // Draw the titlebar controls into the titlebar image.
   for (id view in [window titlebarControls]) {
     NSRect viewFrame = [view frame];
     nsIntRect viewRect = CocoaPointsToDevPixels([mView convertRect:viewFrame fromView:frameView]);
     if (!dirtyTitlebarRegion.Intersects(viewRect)) {
       continue;
     }
     // All of the titlebar controls we're interested in are subclasses of
     // NSButton.
     if (![view isKindOfClass:[NSButton class]]) {
       continue;
     }
     NSButton *button = (NSButton *) view;
     id cellObject = [button cell];
     if (![cellObject isKindOfClass:[NSCell class]]) {
       continue;
     }
     NSCell *cell = (NSCell *) cellObject;
     CGContextSaveGState(ctx);
     CGContextTranslateCTM(ctx, viewFrame.origin.x, viewFrame.origin.y);
     if ([context isFlipped] != [view isFlipped]) {
       CGContextTranslateCTM(ctx, 0, viewFrame.size.height);
       CGContextScaleCTM(ctx, 1, -1);
     }
     [NSGraphicsContext setCurrentContext:[NSGraphicsContext graphicsContextWithGraphicsPort:ctx flipped:[view isFlipped]]];
     [cell drawWithFrame:[button bounds] inView:button];
     [NSGraphicsContext setCurrentContext:context];
     CGContextRestoreGState(ctx);
   }
   CGContextRestoreGState(ctx);
   DrawTitlebarHighlight([frameView bounds].size, [(ChildView*)mView cornerRadius],
                         DevPixelsToCocoaPoints(1));
   [NSGraphicsContext setCurrentContext:oldContext];
   CGContextRestoreGState(ctx);
   mUpdatedTitlebarRegion.Or(mUpdatedTitlebarRegion, dirtyTitlebarRegion);
 }
 // This method draws an overlay in the top of the window which contains the
 // titlebar controls (e.g. close, min, zoom, fullscreen) and the titlebar
 // highlight effect.
 // This is necessary because the real titlebar controls are covered by our
 // OpenGL context. Note that in terms of the NSView hierarchy, our ChildView
 // is actually below the titlebar controls - that's why hovering and clicking
 // them works as expected - but their visual representation is only drawn into
 // the normal window buffer, and the window buffer surface lies below the
 // GLContext surface. In order to make the titlebar controls visible, we have
 // to redraw them inside the OpenGL context surface.
 void
 nsChildView::MaybeDrawTitlebar(GLManager* aManager, const nsIntRect& aRect)
 {
   MutexAutoLock lock(mEffectsLock);
   if (!mIsCoveringTitlebar || mIsFullscreen) {
     return;
   }
   nsIntRegion updatedTitlebarRegion;
   updatedTitlebarRegion.And(mUpdatedTitlebarRegion, mTitlebarRect);
   mUpdatedTitlebarRegion.SetEmpty();
   if (!mTitlebarImage) {
     mTitlebarImage = new RectTextureImage(aManager->gl());
   }
   mTitlebarImage->UpdateFromCGContext(mTitlebarRect.Size(),
                                       updatedTitlebarRegion,
                                       mTitlebarCGContext);
   mTitlebarImage->Draw(aManager, mTitlebarRect.TopLeft());
 }
 static void
 DrawTopLeftCornerMask(CGContextRef aCtx, int aRadius)
 {
   CGContextSetRGBFillColor(aCtx, 1.0, 1.0, 1.0, 1.0);
   CGContextFillEllipseInRect(aCtx, CGRectMake(0, 0, aRadius * 2, aRadius * 2));
 }
 void
 nsChildView::MaybeDrawRoundedCorners(GLManager* aManager, const nsIntRect& aRect)
 {
   MutexAutoLock lock(mEffectsLock);
   if (!mCornerMaskImage) {
     mCornerMaskImage = new RectTextureImage(aManager->gl());
   }
   nsIntSize size(mDevPixelCornerRadius, mDevPixelCornerRadius);
   mCornerMaskImage->UpdateIfNeeded(size, nsIntRegion(), ^(gfx::DrawTarget* drawTarget, const nsIntRegion& updateRegion) {
     ClearRegion(drawTarget, updateRegion);
     RefPtr<gfx::PathBuilder> builder = drawTarget->CreatePathBuilder();
     builder->Arc(gfx::Point(mDevPixelCornerRadius, mDevPixelCornerRadius), mDevPixelCornerRadius, 0, 2.0f * M_PI);
     RefPtr<gfx::Path> path = builder->Finish();
     drawTarget->Fill(path,
                      gfx::ColorPattern(gfx::Color(1.0, 1.0, 1.0, 1.0)),
                      gfx::DrawOptions(1.0f, gfx::CompositionOp::OP_SOURCE));
   });
   // Use operator destination in: multiply all 4 channels with source alpha.
   aManager->gl()->fBlendFuncSeparate(LOCAL_GL_ZERO, LOCAL_GL_SRC_ALPHA,
                                      LOCAL_GL_ZERO, LOCAL_GL_SRC_ALPHA);
   gfx3DMatrix flipX = gfx3DMatrix::ScalingMatrix(-1, 1, 1);
   gfx3DMatrix flipY = gfx3DMatrix::ScalingMatrix(1, -1, 1);
   if (mIsCoveringTitlebar && !mIsFullscreen) {
     // Mask the top corners.
     mCornerMaskImage->Draw(aManager, aRect.TopLeft());
     mCornerMaskImage->Draw(aManager, aRect.TopRight(), flipX);
   }
   if (mHasRoundedBottomCorners && !mIsFullscreen) {
     // Mask the bottom corners.
     mCornerMaskImage->Draw(aManager, aRect.BottomLeft(), flipY);
     mCornerMaskImage->Draw(aManager, aRect.BottomRight(), flipY * flipX);
   }
   // Reset blend mode.
   aManager->gl()->fBlendFuncSeparate(LOCAL_GL_ONE, LOCAL_GL_ONE_MINUS_SRC_ALPHA,
                                      LOCAL_GL_ONE, LOCAL_GL_ONE);
 }
 static int32_t
 FindTitlebarBottom(const nsTArray<nsIWidget::ThemeGeometry>& aThemeGeometries,
                    int32_t aWindowWidth)
 {
   int32_t titlebarBottom = 0;
   for (uint32_t i = 0; i < aThemeGeometries.Length(); ++i) {
     const nsIWidget::ThemeGeometry& g = aThemeGeometries[i];
     if ((g.mWidgetType == NS_THEME_WINDOW_TITLEBAR) &&
         g.mRect.X() <= 0 &&
         g.mRect.XMost() >= aWindowWidth &&
         g.mRect.Y() <= 0) {
       titlebarBottom = std::max(titlebarBottom, g.mRect.YMost());
     }
   }
   return titlebarBottom;
 }
 static int32_t
 FindUnifiedToolbarBottom(const nsTArray<nsIWidget::ThemeGeometry>& aThemeGeometries,
                          int32_t aWindowWidth, int32_t aTitlebarBottom)
 {
   int32_t unifiedToolbarBottom = aTitlebarBottom;
   for (uint32_t i = 0; i < aThemeGeometries.Length(); ++i) {
     const nsIWidget::ThemeGeometry& g = aThemeGeometries[i];
     if ((g.mWidgetType == NS_THEME_MOZ_MAC_UNIFIED_TOOLBAR ||
          g.mWidgetType == NS_THEME_TOOLBAR) &&
         g.mRect.X() <= 0 &&
         g.mRect.XMost() >= aWindowWidth &&
         g.mRect.Y() <= aTitlebarBottom) {
       unifiedToolbarBottom = std::max(unifiedToolbarBottom, g.mRect.YMost());
     }
   }
   return unifiedToolbarBottom;
 }
 static nsIntRect
 FindFirstRectOfType(const nsTArray<nsIWidget::ThemeGeometry>& aThemeGeometries,
                     uint8_t aWidgetType)
 {
   for (uint32_t i = 0; i < aThemeGeometries.Length(); ++i) {
     const nsIWidget::ThemeGeometry& g = aThemeGeometries[i];
     if (g.mWidgetType == aWidgetType) {
       return g.mRect;
     }
   }
   return nsIntRect();
 }
 void
 nsChildView::UpdateThemeGeometries(const nsTArray<ThemeGeometry>& aThemeGeometries)
 {
   if (![mView window] || ![[mView window] isKindOfClass:[ToolbarWindow class]])
     return;
   // Update unified toolbar height.
   int32_t windowWidth = mBounds.width;
   int32_t titlebarBottom = FindTitlebarBottom(aThemeGeometries, windowWidth);
   int32_t unifiedToolbarBottom =
     FindUnifiedToolbarBottom(aThemeGeometries, windowWidth, titlebarBottom);
   ToolbarWindow* win = (ToolbarWindow*)[mView window];
   bool drawsContentsIntoWindowFrame = [win drawsContentsIntoWindowFrame];
   int32_t titlebarHeight = CocoaPointsToDevPixels([win titlebarHeight]);
   int32_t contentOffset = drawsContentsIntoWindowFrame ? titlebarHeight : 0;
   int32_t devUnifiedHeight = titlebarHeight + unifiedToolbarBottom - contentOffset;
   [win setUnifiedToolbarHeight:DevPixelsToCocoaPoints(devUnifiedHeight)];
   // Update titlebar control offsets.
   nsIntRect windowButtonRect = FindFirstRectOfType(aThemeGeometries, NS_THEME_WINDOW_BUTTON_BOX);
   [win placeWindowButtons:[mView convertRect:DevPixelsToCocoaPoints(windowButtonRect) toView:nil]];
   nsIntRect fullScreenButtonRect = FindFirstRectOfType(aThemeGeometries, NS_THEME_MOZ_MAC_FULLSCREEN_BUTTON);
   [win placeFullScreenButton:[mView convertRect:DevPixelsToCocoaPoints(fullScreenButtonRect) toView:nil]];
 }
 TemporaryRef<gfx::DrawTarget>
 nsChildView::StartRemoteDrawing()
 {
   if (!mGLPresenter) {
     mGLPresenter = GLPresenter::CreateForWindow(this);
     if (!mGLPresenter) {
       return nullptr;
     }
   }
   nsIntRegion dirtyRegion = mBounds;
   nsIntSize renderSize = mBounds.Size();
   if (!mBasicCompositorImage) {
     mBasicCompositorImage = new RectTextureImage(mGLPresenter->gl());
   }
   RefPtr<gfx::DrawTarget> drawTarget =
     mBasicCompositorImage->BeginUpdate(renderSize, dirtyRegion);
   if (!drawTarget) {
     // Composite unchanged textures.
     DoRemoteComposition(mBounds);
     return nullptr;
   }
   return drawTarget;
 }
 void
 nsChildView::EndRemoteDrawing()
 {
   mBasicCompositorImage->EndUpdate(true);
   DoRemoteComposition(mBounds);
 }
 void
 nsChildView::CleanupRemoteDrawing()
 {
   mBasicCompositorImage = nullptr;
   mCornerMaskImage = nullptr;
   mResizerImage = nullptr;
   mTitlebarImage = nullptr;
   mGLPresenter = nullptr;
 }
 void
 nsChildView::DoRemoteComposition(const nsIntRect& aRenderRect)
 {
   if (![(ChildView*)mView preRender:mGLPresenter->GetNSOpenGLContext()]) {
     return;
   }
   mGLPresenter->BeginFrame(aRenderRect.Size());
   // Draw the result from the basic compositor.
   mBasicCompositorImage->Draw(mGLPresenter, nsIntPoint(0, 0));
   // DrawWindowOverlay doesn't do anything for non-GL, so it didn't paint
   // anything during the basic compositor transaction. Draw the overlay now.
   DrawWindowOverlay(mGLPresenter, aRenderRect);
   mGLPresenter->EndFrame();
   [(ChildView*)mView postRender:mGLPresenter->GetNSOpenGLContext()];
 }
 #ifdef ACCESSIBILITY
 already_AddRefed<a11y::Accessible>
 nsChildView::GetDocumentAccessible()
 {
   if (!mozilla::a11y::ShouldA11yBeEnabled())
     return nullptr;
   if (mAccessible) {
     nsRefPtr<a11y::Accessible> ret;
     CallQueryReferent(mAccessible.get(),
                       static_cast<a11y::Accessible**>(getter_AddRefs(ret)));
     return ret.forget();
   }
   // need to fetch the accessible anew, because it has gone away.
   // cache the accessible in our weak ptr
   nsRefPtr<a11y::Accessible> acc = GetRootAccessible();
   mAccessible = do_GetWeakReference(static_cast<nsIAccessible *>(acc.get()));
   return acc.forget();
 }
 #endif
 // RectTextureImage implementation
 RectTextureImage::~RectTextureImage()
 {
   if (mTexture) {
     mGLContext->MakeCurrent();
     mGLContext->fDeleteTextures(1, &mTexture);
     mTexture = 0;
   }
 }
 nsIntSize
 RectTextureImage::TextureSizeForSize(const nsIntSize& aSize)
 {
   return nsIntSize(gfx::NextPowerOfTwo(aSize.width),
                    gfx::NextPowerOfTwo(aSize.height));
 }
 TemporaryRef<gfx::DrawTarget>
 RectTextureImage::BeginUpdate(const nsIntSize& aNewSize,
                               const nsIntRegion& aDirtyRegion)
 {
   MOZ_ASSERT(!mInUpdate, "Beginning update during update!");
   mUpdateRegion = aDirtyRegion;
   if (aNewSize != mUsedSize) {
     mUsedSize = aNewSize;
     mUpdateRegion = nsIntRect(nsIntPoint(0, 0), aNewSize);
   }
   if (mUpdateRegion.IsEmpty()) {
     return nullptr;
   }
   nsIntSize neededBufferSize = TextureSizeForSize(mUsedSize);
   if (!mUpdateDrawTarget || mBufferSize != neededBufferSize) {
     gfx::IntSize size(neededBufferSize.width, neededBufferSize.height);
     mUpdateDrawTarget =
       gfx::Factory::CreateDrawTarget(gfx::BackendType::COREGRAPHICS, size,
                                      gfx::SurfaceFormat::B8G8R8A8);
     mBufferSize = neededBufferSize;
   }
   mInUpdate = true;
   RefPtr<gfx::DrawTarget> drawTarget = mUpdateDrawTarget;
   return drawTarget;
 }
 #define NSFoundationVersionWithProperStrideSupportForSubtextureUpload NSFoundationVersionNumber10_6_3
 static bool
 CanUploadSubtextures()
 {
   return NSFoundationVersionNumber >= NSFoundationVersionWithProperStrideSupportForSubtextureUpload;
 }
 void
 RectTextureImage::EndUpdate(bool aKeepSurface)
 {
   MOZ_ASSERT(mInUpdate, "Ending update while not in update");
   bool overwriteTexture = false;
   nsIntRegion updateRegion = mUpdateRegion;
   if (!mTexture || (mTextureSize != mBufferSize)) {
     overwriteTexture = true;
     mTextureSize = mBufferSize;
   }
   if (overwriteTexture || !CanUploadSubtextures()) {
     updateRegion = nsIntRect(nsIntPoint(0, 0), mTextureSize);
   }
   RefPtr<gfx::SourceSurface> snapshot = mUpdateDrawTarget->Snapshot();
   RefPtr<gfx::DataSourceSurface> dataSnapshot = snapshot->GetDataSurface();
   UploadSurfaceToTexture(mGLContext,
                          dataSnapshot,
                          updateRegion,
                          mTexture,
                          overwriteTexture,
                          updateRegion.GetBounds().TopLeft(),
                          false,
                          LOCAL_GL_TEXTURE0,
                          LOCAL_GL_TEXTURE_RECTANGLE_ARB);
   if (!aKeepSurface) {
     mUpdateDrawTarget = nullptr;
   }
   mInUpdate = false;
 }
 void
 RectTextureImage::UpdateFromCGContext(const nsIntSize& aNewSize,
                                       const nsIntRegion& aDirtyRegion,
                                       CGContextRef aCGContext)
 {
   gfx::IntSize size = gfx::IntSize(CGBitmapContextGetWidth(aCGContext),
                                    CGBitmapContextGetHeight(aCGContext));
   mBufferSize.SizeTo(size.width, size.height);
   RefPtr<gfx::DrawTarget> dt = BeginUpdate(aNewSize, aDirtyRegion);
   if (dt) {
     gfx::Rect rect(0, 0, size.width, size.height);
     gfxUtils::ClipToRegion(dt, GetUpdateRegion());
     RefPtr<gfx::SourceSurface> sourceSurface =
       dt->CreateSourceSurfaceFromData(static_cast<uint8_t *>(CGBitmapContextGetData(aCGContext)),
                                       size,
                                       CGBitmapContextGetBytesPerRow(aCGContext),
                                       gfx::SurfaceFormat::B8G8R8A8);
     dt->DrawSurface(sourceSurface, rect, rect,
                     gfx::DrawSurfaceOptions(),
                     gfx::DrawOptions(1.0, gfx::CompositionOp::OP_SOURCE));
     dt->PopClip();
     EndUpdate();
   }
 }
 void
 RectTextureImage::UpdateFromDrawTarget(const nsIntSize& aNewSize,
                                        const nsIntRegion& aDirtyRegion,
                                        gfx::DrawTarget* aFromDrawTarget)
 {
   mUpdateDrawTarget = aFromDrawTarget;
   mBufferSize.SizeTo(aFromDrawTarget->GetSize().width, aFromDrawTarget->GetSize().height);
   RefPtr<gfx::DrawTarget> drawTarget = BeginUpdate(aNewSize, aDirtyRegion);
   if (drawTarget) {
     if (drawTarget != aFromDrawTarget) {
       RefPtr<gfx::SourceSurface> source = aFromDrawTarget->Snapshot();
       gfx::Rect rect(0, 0, aFromDrawTarget->GetSize().width, aFromDrawTarget->GetSize().height);
       gfxUtils::ClipToRegion(drawTarget, GetUpdateRegion());
       drawTarget->DrawSurface(source, rect, rect,
                               gfx::DrawSurfaceOptions(),
                               gfx::DrawOptions(1.0, gfx::CompositionOp::OP_SOURCE));
       drawTarget->PopClip();
     }
     EndUpdate();
   }
   mUpdateDrawTarget = nullptr;
 }
 void
 RectTextureImage::Draw(GLManager* aManager,
                        const nsIntPoint& aLocation,
                        const gfx3DMatrix& aTransform)
 {
   ShaderProgramOGL* program = aManager->GetProgram(LOCAL_GL_TEXTURE_RECTANGLE_ARB,
                                                    gfx::SurfaceFormat::R8G8B8A8);
   aManager->gl()->fBindTexture(LOCAL_GL_TEXTURE_RECTANGLE_ARB, mTexture);
   program->Activate();
   program->SetProjectionMatrix(aManager->GetProjMatrix());
   program->SetLayerQuadRect(nsIntRect(nsIntPoint(0, 0), mUsedSize));
   gfx::Matrix4x4 transform;
   gfx::ToMatrix4x4(aTransform, transform);
   program->SetLayerTransform(transform * gfx::Matrix4x4().Translate(aLocation.x, aLocation.y, 0));
   program->SetTextureTransform(gfx::Matrix4x4());
   program->SetRenderOffset(nsIntPoint(0, 0));
   program->SetTexCoordMultiplier(mUsedSize.width, mUsedSize.height);
   program->SetTextureUnit(0);
   aManager->BindAndDrawQuad(program);
   aManager->gl()->fBindTexture(LOCAL_GL_TEXTURE_RECTANGLE_ARB, 0);
 }
 // GLPresenter implementation
 GLPresenter::GLPresenter(GLContext* aContext)
  : mGLContext(aContext)
 {
   mGLContext->MakeCurrent();
   ShaderConfigOGL config;
   config.SetTextureTarget(LOCAL_GL_TEXTURE_RECTANGLE_ARB);
   mRGBARectProgram = new ShaderProgramOGL(mGLContext,
     ProgramProfileOGL::GetProfileFor(config));
   // Create mQuadVBO.
   mGLContext->fGenBuffers(1, &mQuadVBO);
   mGLContext->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, mQuadVBO);
   GLfloat vertices[] = {
     /* First quad vertices */
 .0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
     /* Then quad texcoords */
 .0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
   };
   mGLContext->fBufferData(LOCAL_GL_ARRAY_BUFFER, sizeof(vertices), vertices, LOCAL_GL_STATIC_DRAW);
   mGLContext->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, 0);
 }
 GLPresenter::~GLPresenter()
 {
   if (mQuadVBO) {
     mGLContext->MakeCurrent();
     mGLContext->fDeleteBuffers(1, &mQuadVBO);
     mQuadVBO = 0;
   }
 }
 void
 GLPresenter::BindAndDrawQuad(ShaderProgramOGL *aProgram)
 {
   mGLContext->MakeCurrent();
   GLuint vertAttribIndex = aProgram->AttribLocation(ShaderProgramOGL::VertexCoordAttrib);
   GLuint texCoordAttribIndex = aProgram->AttribLocation(ShaderProgramOGL::TexCoordAttrib);
   mGLContext->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, mQuadVBO);
   mGLContext->fVertexAttribPointer(vertAttribIndex, 2,
                                    LOCAL_GL_FLOAT, LOCAL_GL_FALSE, 0,
                                    (GLvoid*)0);
   mGLContext->fEnableVertexAttribArray(vertAttribIndex);
   mGLContext->fVertexAttribPointer(texCoordAttribIndex, 2,
                                    LOCAL_GL_FLOAT, LOCAL_GL_FALSE, 0,
                                    (GLvoid*) (sizeof(float)*4*2));
   mGLContext->fEnableVertexAttribArray(texCoordAttribIndex);
   mGLContext->fDrawArrays(LOCAL_GL_TRIANGLE_STRIP, 0, 4);
   mGLContext->fDisableVertexAttribArray(vertAttribIndex);
   mGLContext->fDisableVertexAttribArray(texCoordAttribIndex);
 }
 void
 GLPresenter::BeginFrame(nsIntSize aRenderSize)
 {
   mGLContext->MakeCurrent();
   mGLContext->fViewport(0, 0, aRenderSize.width, aRenderSize.height);
   // Matrix to transform (0, 0, width, height) to viewport space (-1.0, 1.0,
   // 2, 2) and flip the contents.
   gfx::Matrix viewMatrix;
   viewMatrix.Translate(-1.0, 1.0);
   viewMatrix.Scale(2.0f / float(aRenderSize.width), 2.0f / float(aRenderSize.height));
   viewMatrix.Scale(1.0f, -1.0f);
   gfx::Matrix4x4 matrix3d = gfx::Matrix4x4::From2D(viewMatrix);
   matrix3d._33 = 0.0f;
   // set the projection matrix for the next time the program is activated
   mProjMatrix = matrix3d;
   // Default blend function implements "OVER"
   mGLContext->fBlendFuncSeparate(LOCAL_GL_ONE, LOCAL_GL_ONE_MINUS_SRC_ALPHA,
                                  LOCAL_GL_ONE, LOCAL_GL_ONE);
   mGLContext->fEnable(LOCAL_GL_BLEND);
   mGLContext->fClearColor(0.0, 0.0, 0.0, 0.0);
   mGLContext->fClear(LOCAL_GL_COLOR_BUFFER_BIT | LOCAL_GL_DEPTH_BUFFER_BIT);
   mGLContext->fEnable(LOCAL_GL_TEXTURE_RECTANGLE_ARB);
 }
 void
 GLPresenter::EndFrame()
 {
   mGLContext->SwapBuffers();
   mGLContext->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, 0);
 }
 #pragma mark -
 @implementation ChildView
 // globalDragPboard is non-null during native drag sessions that did not originate
 // in our native NSView (it is set in |draggingEntered:|). It is unset when the
 // drag session ends for this view, either with the mouse exiting or when a drop
 // occurs in this view.
 NSPasteboard* globalDragPboard = nil;
 // gLastDragView and gLastDragMouseDownEvent are used to communicate information
 // to the drag service during drag invocation (starting a drag in from the view).
 // gLastDragView is only non-null while mouseDragged is on the call stack.
 NSView* gLastDragView = nil;
 NSEvent* gLastDragMouseDownEvent = nil;
 + (void)initialize
 {
   static BOOL initialized = NO;
   if (!initialized) {
     // Inform the OS about the types of services (from the "Services" menu)
     // that we can handle.
     NSArray *sendTypes = [[NSArray alloc] initWithObjects:NSStringPboardType,NSHTMLPboardType,nil];
     NSArray *returnTypes = [[NSArray alloc] initWithObjects:NSStringPboardType,NSHTMLPboardType,nil];
     [NSApp registerServicesMenuSendTypes:sendTypes returnTypes:returnTypes];
     [sendTypes release];
     [returnTypes release];
     initialized = YES;
   }
 }
 + (void)registerViewForDraggedTypes:(NSView*)aView
 {
   [aView registerForDraggedTypes:[NSArray arrayWithObjects:NSFilenamesPboardType,
                                                            NSStringPboardType,
                                                            NSHTMLPboardType,
                                                            NSURLPboardType,
                                                            NSFilesPromisePboardType,
                                                            kWildcardPboardType,
                                                            kCorePboardType_url,
                                                            kCorePboardType_urld,
                                                            kCorePboardType_urln,
                                                            nil]];
 }
 // initWithFrame:geckoChild:
 - (id)initWithFrame:(NSRect)inFrame geckoChild:(nsChildView*)inChild
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
   if ((self = [super initWithFrame:inFrame])) {
     mGeckoChild = inChild;
     mIsPluginView = NO;
 #ifndef NP_NO_CARBON
     // We don't support the Carbon event model but it's still the default
     // model for i386 per NPAPI.
     mPluginEventModel = NPEventModelCarbon;
 #else
     mPluginEventModel = NPEventModelCocoa;
 #endif
 #ifndef NP_NO_QUICKDRAW
     // We don't support the Quickdraw drawing model any more but it's still
     // the default model for i386 per NPAPI.
     mPluginDrawingModel = NPDrawingModelQuickDraw;
 #else
     mPluginDrawingModel = NPDrawingModelCoreGraphics;
 #endif
     mPendingDisplay = NO;
     mBlockedLastMouseDown = NO;
     mExpectingWheelStop = NO;
     mLastMouseDownEvent = nil;
     mClickThroughMouseDownEvent = nil;
     mDragService = nullptr;
     mGestureState = eGestureState_None;
     mCumulativeMagnification = 0.0;
     mCumulativeRotation = 0.0;
     // We can't call forceRefreshOpenGL here because, in order to work around
     // the bug, it seems we need to have a draw already happening. Therefore,
     // we call it in drawRect:inContext:, when we know that a draw is in
     // progress.
     mDidForceRefreshOpenGL = NO;
     [self setFocusRingType:NSFocusRingTypeNone];
 #ifdef __LP64__
     mCancelSwipeAnimation = nil;
     mCurrentSwipeDir = 0;
 #endif
     mTopLeftCornerMask = NULL;
   }
   // register for things we'll take from other applications
   [ChildView registerViewForDraggedTypes:self];
   [[NSNotificationCenter defaultCenter] addObserver:self
                                            selector:@selector(windowBecameMain:)
                                                name:NSWindowDidBecomeMainNotification
                                              object:nil];
   [[NSNotificationCenter defaultCenter] addObserver:self
                                            selector:@selector(windowResignedMain:)
                                                name:NSWindowDidResignMainNotification
                                              object:nil];
   [[NSNotificationCenter defaultCenter] addObserver:self
                                            selector:@selector(systemMetricsChanged)
                                                name:NSControlTintDidChangeNotification
                                              object:nil];
   [[NSNotificationCenter defaultCenter] addObserver:self
                                            selector:@selector(systemMetricsChanged)
                                                name:NSSystemColorsDidChangeNotification
                                              object:nil];
   // TODO: replace the string with the constant once we build with the 10.7 SDK
   [[NSNotificationCenter defaultCenter] addObserver:self
                                            selector:@selector(scrollbarSystemMetricChanged)
                                                name:@"NSPreferredScrollerStyleDidChangeNotification"
                                              object:nil];
   [[NSDistributedNotificationCenter defaultCenter] addObserver:self
                                                       selector:@selector(systemMetricsChanged)
                                                           name:@"AppleAquaScrollBarVariantChanged"
                                                         object:nil
                                             suspensionBehavior:NSNotificationSuspensionBehaviorDeliverImmediately];
   [[NSNotificationCenter defaultCenter] addObserver:self
                                            selector:@selector(_surfaceNeedsUpdate:)
                                                name:NSViewGlobalFrameDidChangeNotification
                                              object:self];
   return self;
   NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
 }
 - (void)installTextInputHandler:(TextInputHandler*)aHandler
 {
   mTextInputHandler = aHandler;
 }
 - (void)uninstallTextInputHandler
 {
   mTextInputHandler = nullptr;
 }
 // Work around bug 603134.
 // OS X has a bug that causes new OpenGL windows to only paint once or twice,
 // then stop painting altogether. By clearing the drawable from the GL context,
 // and then resetting the view to ourselves, we convince OS X to start updating
 // again.
 // This can cause a flash in new windows - bug 631339 - but it's very hard to
 // fix that while maintaining this workaround.
 - (void)forceRefreshOpenGL
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   [mGLContext clearDrawable];
   [self updateGLContext];
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)setGLContext:(NSOpenGLContext *)aGLContext
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   mGLContext = aGLContext;
   [mGLContext retain];
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (bool)preRender:(NSOpenGLContext *)aGLContext
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
   if (![self window] ||
       ([[self window] isKindOfClass:[BaseWindow class]] &&
        ![(BaseWindow*)[self window] isVisibleOrBeingShown])) {
     // Before the window is shown, our GL context's front FBO is not
     // framebuffer complete, so we refuse to render.
     return false;
   }
   if (!mGLContext) {
     [self setGLContext:aGLContext];
     [self updateGLContext];
   }
   CGLLockContext((CGLContextObj)[aGLContext CGLContextObj]);
   return true;
   NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(false);
 }
 - (void)postRender:(NSOpenGLContext *)aGLContext
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   CGLUnlockContext((CGLContextObj)[aGLContext CGLContextObj]);
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)dealloc
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   [mGLContext release];
   [mPendingDirtyRects release];
   [mLastMouseDownEvent release];
   [mClickThroughMouseDownEvent release];
   CGImageRelease(mTopLeftCornerMask);
   ChildViewMouseTracker::OnDestroyView(self);
   [[NSNotificationCenter defaultCenter] removeObserver:self];
   [[NSDistributedNotificationCenter defaultCenter] removeObserver:self];
   [super dealloc];
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)updatePluginTopLevelWindowStatus:(BOOL)hasMain
 {
   if (!mGeckoChild)
     return;
   WidgetPluginEvent pluginEvent(true, NS_PLUGIN_FOCUS_EVENT, mGeckoChild);
   NPCocoaEvent cocoaEvent;
   nsCocoaUtils::InitNPCocoaEvent(&cocoaEvent);
   cocoaEvent.type = NPCocoaEventWindowFocusChanged;
   cocoaEvent.data.focus.hasFocus = hasMain;
   nsCocoaUtils::InitPluginEvent(pluginEvent, cocoaEvent);
   mGeckoChild->DispatchWindowEvent(pluginEvent);
 }
 - (void)windowBecameMain:(NSNotification*)inNotification
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (mIsPluginView && mPluginEventModel == NPEventModelCocoa) {
     if ((NSWindow*)[inNotification object] == [self window]) {
       [self updatePluginTopLevelWindowStatus:YES];
     }
   }
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)windowResignedMain:(NSNotification*)inNotification
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (mIsPluginView && mPluginEventModel == NPEventModelCocoa) {
     if ((NSWindow*)[inNotification object] == [self window]) {
       [self updatePluginTopLevelWindowStatus:NO];
     }
   }
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)widgetDestroyed
 {
   if (mTextInputHandler) {
     mTextInputHandler->OnDestroyWidget(mGeckoChild);
     mTextInputHandler = nullptr;
   }
   mGeckoChild = nullptr;
   // Just in case we're destroyed abruptly and missed the draggingExited
   // or performDragOperation message.
   NS_IF_RELEASE(mDragService);
 }
 // mozView method, return our gecko child view widget. Note this does not AddRef.
 - (nsIWidget*) widget
 {
   return static_cast<nsIWidget*>(mGeckoChild);
 }
 - (void)systemMetricsChanged
 {
   if (mGeckoChild)
     mGeckoChild->NotifyThemeChanged();
 }
 - (void)scrollbarSystemMetricChanged
 {
   [self systemMetricsChanged];
   if (mGeckoChild) {
     nsIWidgetListener* listener = mGeckoChild->GetWidgetListener();
     if (listener) {
       listener->GetPresShell()->ReconstructFrames();
     }
   }
 }
 - (void)setNeedsPendingDisplay
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   mPendingFullDisplay = YES;
   if (!mPendingDisplay) {
     [self performSelector:@selector(processPendingRedraws) withObject:nil afterDelay:0];
     mPendingDisplay = YES;
   }
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)setNeedsPendingDisplayInRect:(NSRect)invalidRect
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (!mPendingDirtyRects)
     mPendingDirtyRects = [[NSMutableArray alloc] initWithCapacity:1];
   [mPendingDirtyRects addObject:[NSValue valueWithRect:invalidRect]];
   if (!mPendingDisplay) {
     [self performSelector:@selector(processPendingRedraws) withObject:nil afterDelay:0];
     mPendingDisplay = YES;
   }
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 // Clears the queue of any pending invalides
 - (void)processPendingRedraws
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (mPendingFullDisplay) {
     [self setNeedsDisplay:YES];
   }
   else if (mPendingDirtyRects) {
     unsigned int count = [mPendingDirtyRects count];
     for (unsigned int i = 0; i < count; ++i) {
       [self setNeedsDisplayInRect:[[mPendingDirtyRects objectAtIndex:i] rectValue]];
     }
   }
   mPendingFullDisplay = NO;
   mPendingDisplay = NO;
   [mPendingDirtyRects release];
   mPendingDirtyRects = nil;
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)setNeedsDisplayInRect:(NSRect)aRect
 {
   if (![self isUsingOpenGL]) {
     [super setNeedsDisplayInRect:aRect];
     return;
   }
   if ([[self window] isVisible] && [self isUsingMainThreadOpenGL]) {
     // Draw without calling drawRect. This prevent us from
     // needing to access the normal window buffer surface unnecessarily, so we
     // waste less time synchronizing the two surfaces. (These synchronizations
     // show up in a profiler as CGSDeviceLock / _CGSLockWindow /
     // _CGSSynchronizeWindowBackingStore.) It also means that Cocoa doesn't
     // have any potentially expensive invalid rect management for us.
     if (!mWaitingForPaint) {
       mWaitingForPaint = YES;
       // Use NSRunLoopCommonModes instead of the default NSDefaultRunLoopMode
       // so that the timer also fires while a native menu is open.
       [self performSelector:@selector(drawUsingOpenGLCallback)
                  withObject:nil
                  afterDelay:0
                     inModes:[NSArray arrayWithObject:NSRunLoopCommonModes]];
     }
   }
 }
 - (NSString*)description
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
   return [NSString stringWithFormat:@"ChildView %p, gecko child %p, frame %@", self, mGeckoChild, NSStringFromRect([self frame])];
   NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
 }
 // Make the origin of this view the topLeft corner (gecko origin) rather
 // than the bottomLeft corner (standard cocoa origin).
 - (BOOL)isFlipped
 {
   return YES;
 }
 - (BOOL)isOpaque
 {
   return [[self window] isOpaque] && !mIsPluginView;
 }
 -(void)setIsPluginView:(BOOL)aIsPlugin
 {
   mIsPluginView = aIsPlugin;
 }
 -(BOOL)isPluginView
 {
   return mIsPluginView;
 }
 - (NSView *)hitTest:(NSPoint)aPoint
 {
   NSView* target = [super hitTest:aPoint];
   if ((target == self) && [self isPluginView] && mGeckoChild) {
     nsAutoRetainCocoaObject kungFuDeathGrip(self);
     NSPoint cocoaLoc = [[self superview] convertPoint:aPoint toView:self];
     LayoutDeviceIntPoint widgetLoc = LayoutDeviceIntPoint::FromUntyped(
       mGeckoChild->CocoaPointsToDevPixels(cocoaLoc));
     WidgetQueryContentEvent hitTest(true, NS_QUERY_DOM_WIDGET_HITTEST,
                                     mGeckoChild);
     hitTest.InitForQueryDOMWidgetHittest(widgetLoc);
     // This might destroy our widget.
     mGeckoChild->DispatchWindowEvent(hitTest);
     if (!mGeckoChild) {
       return nil;
     }
     if (hitTest.mSucceeded && !hitTest.mReply.mWidgetIsHit) {
       return nil;
     }
   }
   return target;
 }
 // Are we processing an NSLeftMouseDown event that will fail to click through?
 // If so, we shouldn't focus or unfocus a plugin.
 - (BOOL)isInFailingLeftClickThrough
 {
   if (!mGeckoChild)
     return NO;
   if (!mClickThroughMouseDownEvent ||
       [mClickThroughMouseDownEvent type] != NSLeftMouseDown)
     return NO;
   BOOL retval =
     !ChildViewMouseTracker::WindowAcceptsEvent([self window],
                                                mClickThroughMouseDownEvent,
                                                self, true);
   // If we return YES here, this will result in us not being focused,
   // which will stop us receiving mClickThroughMouseDownEvent in
   // [ChildView mouseDown:].  So we need to release and null-out
   // mClickThroughMouseDownEvent here.
   if (retval) {
     [mClickThroughMouseDownEvent release];
     mClickThroughMouseDownEvent = nil;
   }
   return retval;
 }
 - (void)setPluginEventModel:(NPEventModel)eventModel
 {
   mPluginEventModel = eventModel;
 }
 - (void)setPluginDrawingModel:(NPDrawingModel)drawingModel
 {
   mPluginDrawingModel = drawingModel;
 }
 - (NPEventModel)pluginEventModel
 {
   return mPluginEventModel;
 }
 - (NPDrawingModel)pluginDrawingModel
 {
   return mPluginDrawingModel;
 }
 - (void)sendFocusEvent:(uint32_t)eventType
 {
   if (!mGeckoChild)
     return;
   nsEventStatus status = nsEventStatus_eIgnore;
   WidgetGUIEvent focusGuiEvent(true, eventType, mGeckoChild);
   focusGuiEvent.time = PR_IntervalNow();
   mGeckoChild->DispatchEvent(&focusGuiEvent, status);
 }
 // We accept key and mouse events, so don't keep passing them up the chain. Allow
 // this to be a 'focused' widget for event dispatch.
 - (BOOL)acceptsFirstResponder
 {
   return YES;
 }
 // Accept mouse down events on background windows
 - (BOOL)acceptsFirstMouse:(NSEvent*)aEvent
 {
   if (![[self window] isKindOfClass:[PopupWindow class]]) {
     // We rely on this function to tell us that the mousedown was on a
     // background window. Inside mouseDown we can't tell whether we were
     // inactive because at that point we've already been made active.
     // Unfortunately, acceptsFirstMouse is called for PopupWindows even when
     // their parent window is active, so ignore this on them for now.
     mClickThroughMouseDownEvent = [aEvent retain];
   }
   return YES;
 }
 - (void)viewWillMoveToWindow:(NSWindow *)newWindow
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (!newWindow)
     HideChildPluginViews(self);
   [super viewWillMoveToWindow:newWindow];
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)viewDidMoveToWindow
 {
   if (mPluginEventModel == NPEventModelCocoa &&
       [self window] && [self isPluginView] && mGeckoChild) {
     mGeckoChild->UpdatePluginPort();
   }
   [super viewDidMoveToWindow];
 }
 - (void)scrollRect:(NSRect)aRect by:(NSSize)offset
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   // Update any pending dirty rects to reflect the new scroll position
   if (mPendingDirtyRects) {
     unsigned int count = [mPendingDirtyRects count];
     for (unsigned int i = 0; i < count; ++i) {
       NSRect oldRect = [[mPendingDirtyRects objectAtIndex:i] rectValue];
       NSRect newRect = NSOffsetRect(oldRect, offset.width, offset.height);
       [mPendingDirtyRects replaceObjectAtIndex:i
                                     withObject:[NSValue valueWithRect:newRect]];
     }
   }
   [super scrollRect:aRect by:offset];
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (BOOL)mouseDownCanMoveWindow
 {
   return [[self window] isMovableByWindowBackground];
 }
 -(void)updateGLContext
 {
   if (mGLContext) {
     CGLLockContext((CGLContextObj)[mGLContext CGLContextObj]);
     [mGLContext setView:self];
     [mGLContext update];
     CGLUnlockContext((CGLContextObj)[mGLContext CGLContextObj]);
   }
 }
 - (void)_surfaceNeedsUpdate:(NSNotification*)notification
 {
    [self updateGLContext];
 }
 - (BOOL)wantsBestResolutionOpenGLSurface
 {
   return nsCocoaUtils::HiDPIEnabled() ? YES : NO;
 }
 - (void)viewDidChangeBackingProperties
 {
   [super viewDidChangeBackingProperties];
   if (mGeckoChild) {
     // actually, it could be the color space that's changed,
     // but we can't tell the difference here except by retrieving
     // the backing scale factor and comparing to the old value
     mGeckoChild->BackingScaleFactorChanged();
   }
 }
 - (BOOL)isCoveringTitlebar
 {
   return [[self window] isKindOfClass:[BaseWindow class]] &&
          [(BaseWindow*)[self window] mainChildView] == self &&
          [(BaseWindow*)[self window] drawsContentsIntoWindowFrame];
 }
 - (nsIntRegion)nativeDirtyRegionWithBoundingRect:(NSRect)aRect
 {
   nsIntRect boundingRect = mGeckoChild->CocoaPointsToDevPixels(aRect);
   const NSRect *rects;
   NSInteger count;
   [self getRectsBeingDrawn:&rects count:&count];
   if (count > MAX_RECTS_IN_REGION) {
     return boundingRect;
   }
   nsIntRegion region;
   for (NSInteger i = 0; i < count; ++i) {
     region.Or(region, mGeckoChild->CocoaPointsToDevPixels(rects[i]));
   }
   region.And(region, boundingRect);
   return region;
 }
 // The display system has told us that a portion of our view is dirty. Tell
 // gecko to paint it
 - (void)drawRect:(NSRect)aRect
 {
   CGContextRef cgContext = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];
   [self drawRect:aRect inContext:cgContext];
   // If we're a transparent window and our contents have changed, we need
   // to make sure the shadow is updated to the new contents.
   if ([[self window] isKindOfClass:[BaseWindow class]]) {
     [(BaseWindow*)[self window] deferredInvalidateShadow];
   }
 }
 - (void)drawRect:(NSRect)aRect inContext:(CGContextRef)aContext
 {
   if (!mGeckoChild || !mGeckoChild->IsVisible())
     return;
   // Don't ever draw plugin views explicitly; they'll be drawn as part of their parent widget.
   if (mIsPluginView)
     return;
 #ifdef DEBUG_UPDATE
   nsIntRect geckoBounds;
   mGeckoChild->GetBounds(geckoBounds);
   fprintf (stderr, "---- Update[%p][%p] [%f %f %f %f] cgc: %p\n  gecko bounds: [%d %d %d %d]\n",
            self, mGeckoChild,
            aRect.origin.x, aRect.origin.y, aRect.size.width, aRect.size.height, aContext,
            geckoBounds.x, geckoBounds.y, geckoBounds.width, geckoBounds.height);
   CGAffineTransform xform = CGContextGetCTM(aContext);
   fprintf (stderr, "  xform in: [%f %f %f %f %f %f]\n", xform.a, xform.b, xform.c, xform.d, xform.tx, xform.ty);
 #endif
   if ([self isUsingOpenGL]) {
     // For Gecko-initiated repaints in OpenGL mode, drawUsingOpenGL is
     // directly called from a delayed perform callback - without going through
     // drawRect.
     // Paints that come through here are triggered by something that Cocoa
     // controls, for example by window resizing or window focus changes.
     // Since this view is usually declared as opaque, the window's pixel
     // buffer may now contain garbage which we need to prevent from reaching
     // the screen. The only place where garbage can show is in the window
     // corners - the rest of the window is covered by opaque content in our
     // OpenGL surface.
     // So we need to clear the pixel buffer contents in the corners.
     [self clearCorners];
     // Do GL composition and return.
     [self drawUsingOpenGL];
     return;
   }
   PROFILER_LABEL("widget", "ChildView::drawRect");
   // The CGContext that drawRect supplies us with comes with a transform that
   // scales one user space unit to one Cocoa point, which can consist of
   // multiple dev pixels. But Gecko expects its supplied context to be scaled
   // to device pixels, so we need to reverse the scaling.
   double scale = mGeckoChild->BackingScaleFactor();
   CGContextSaveGState(aContext);
   CGContextScaleCTM(aContext, 1.0 / scale, 1.0 / scale);
   NSSize viewSize = [self bounds].size;
   nsIntSize backingSize(viewSize.width * scale, viewSize.height * scale);
   CGContextSaveGState(aContext);
   nsIntRegion region = [self nativeDirtyRegionWithBoundingRect:aRect];
   // Create Cairo objects.
   nsRefPtr<gfxQuartzSurface> targetSurface =
     new gfxQuartzSurface(aContext, backingSize);
   targetSurface->SetAllowUseAsSource(false);
   nsRefPtr<gfxContext> targetContext;
   if (gfxPlatform::GetPlatform()->SupportsAzureContentForType(gfx::BackendType::CAIRO)) {
     RefPtr<gfx::DrawTarget> dt =
       gfxPlatform::GetPlatform()->CreateDrawTargetForSurface(targetSurface,
                                                              gfx::IntSize(backingSize.width,
                                                                           backingSize.height));
     dt->AddUserData(&gfxContext::sDontUseAsSourceKey, dt, nullptr);
     targetContext = new gfxContext(dt);
   } else if (gfxPlatform::GetPlatform()->SupportsAzureContentForType(gfx::BackendType::COREGRAPHICS)) {
     RefPtr<gfx::DrawTarget> dt =
       gfx::Factory::CreateDrawTargetForCairoCGContext(aContext,
                                                       gfx::IntSize(backingSize.width,
                                                                    backingSize.height));
     dt->AddUserData(&gfxContext::sDontUseAsSourceKey, dt, nullptr);
     targetContext = new gfxContext(dt);
   } else {
     targetContext = new gfxContext(targetSurface);
   }
   // Set up the clip region.
   nsIntRegionRectIterator iter(region);
   targetContext->NewPath();
   for (;;) {
     const nsIntRect* r = iter.Next();
     if (!r)
       break;
     targetContext->Rectangle(gfxRect(r->x, r->y, r->width, r->height));
   }
   targetContext->Clip();
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   bool painted = false;
   if (mGeckoChild->GetLayerManager()->GetBackendType() == LayersBackend::LAYERS_BASIC) {
     nsBaseWidget::AutoLayerManagerSetup
       setupLayerManager(mGeckoChild, targetContext, BufferMode::BUFFER_NONE);
     painted = mGeckoChild->PaintWindow(region);
   } else if (mGeckoChild->GetLayerManager()->GetBackendType() == LayersBackend::LAYERS_CLIENT) {
     // We only need this so that we actually get DidPaintWindow fired
     painted = mGeckoChild->PaintWindow(region);
   }
   targetContext = nullptr;
   targetSurface = nullptr;
   CGContextRestoreGState(aContext);
   // Undo the scale transform so that from now on the context is in
   // CocoaPoints again.
   CGContextRestoreGState(aContext);
   if (!painted && [self isOpaque]) {
     // Gecko refused to draw, but we've claimed to be opaque, so we have to
     // draw something--fill with white.
     CGContextSetRGBFillColor(aContext, 1, 1, 1, 1);
     CGContextFillRect(aContext, NSRectToCGRect(aRect));
   }
   if ([self isCoveringTitlebar]) {
     [self drawTitleString];
     [self drawTitlebarHighlight];
     [self maskTopCornersInContext:aContext];
   }
 #ifdef DEBUG_UPDATE
   fprintf (stderr, "---- update done ----\n");
 #if 0
   CGContextSetRGBStrokeColor (aContext,
                             ((((unsigned long)self) & 0xff)) / 255.0,
                             ((((unsigned long)self) & 0xff00) >> 8) / 255.0,
                             ((((unsigned long)self) & 0xff0000) >> 16) / 255.0,
 .5);
 #endif
   CGContextSetRGBStrokeColor(aContext, 1, 0, 0, 0.8);
   CGContextSetLineWidth(aContext, 4.0);
   CGContextStrokeRect(aContext, NSRectToCGRect(aRect));
 #endif
 }
 - (BOOL)isUsingMainThreadOpenGL
 {
   if (!mGeckoChild || ![self window])
     return NO;
   return mGeckoChild->GetLayerManager(nullptr)->GetBackendType() == mozilla::layers::LayersBackend::LAYERS_OPENGL;
 }
 - (BOOL)isUsingOpenGL
 {
   if (!mGeckoChild || ![self window])
     return NO;
   return mGLContext || mUsingOMTCompositor || [self isUsingMainThreadOpenGL];
 }
 - (void)drawUsingOpenGL
 {
   PROFILER_LABEL("widget", "ChildView::drawUsingOpenGL");
   if (![self isUsingOpenGL] || !mGeckoChild->IsVisible())
     return;
   mWaitingForPaint = NO;
   nsIntRect geckoBounds;
   mGeckoChild->GetBounds(geckoBounds);
   nsIntRegion region(geckoBounds);
   mGeckoChild->PaintWindow(region);
   // Force OpenGL to refresh the very first time we draw. This works around a
   // Mac OS X bug that stops windows updating on OS X when we use OpenGL.
   if (!mDidForceRefreshOpenGL) {
     [self performSelector:@selector(forceRefreshOpenGL) withObject:nil afterDelay:0];
     mDidForceRefreshOpenGL = YES;
   }
 }
 // Called asynchronously after setNeedsDisplay in order to avoid entering the
 // normal drawing machinery.
 - (void)drawUsingOpenGLCallback
 {
   if (mWaitingForPaint) {
     [self drawUsingOpenGL];
   }
 }
 - (BOOL)hasRoundedBottomCorners
 {
   return [[self window] respondsToSelector:@selector(bottomCornerRounded)] &&
   [[self window] bottomCornerRounded];
 }
 - (CGFloat)cornerRadius
 {
   NSView* frameView = [[[self window] contentView] superview];
   if (!frameView || ![frameView respondsToSelector:@selector(roundedCornerRadius)])
     return 4.0f;
   return [frameView roundedCornerRadius];
 }
 // Accelerated windows have two NSSurfaces:
 //  (1) The window's pixel buffer in the back and
 //  (2) the OpenGL view in the front.
 // These two surfaces are composited by the window manager. Drawing into the
 // CGContext which is provided by drawRect ends up in (1).
 // When our window has rounded corners, the OpenGL view has transparent pixels
 // in the corners. In these places the contents of the window's pixel buffer
 // can show through. So we need to make sure that the pixel buffer is
 // transparent in the corners so that no garbage reaches the screen.
 // The contents of the pixel buffer in the rest of the window don't matter
 // because they're covered by opaque pixels of the OpenGL context.
 // Making the corners transparent works even though our window is
 // declared "opaque" (in the NSWindow's isOpaque method).
 - (void)clearCorners
 {
   CGFloat radius = [self cornerRadius];
   CGFloat w = [self bounds].size.width, h = [self bounds].size.height;
   [[NSColor clearColor] set];
   if ([self isCoveringTitlebar]) {
     NSRectFill(NSMakeRect(0, 0, radius, radius));
     NSRectFill(NSMakeRect(w - radius, 0, radius, radius));
   }
   if ([self hasRoundedBottomCorners]) {
     NSRectFill(NSMakeRect(0, h - radius, radius, radius));
     NSRectFill(NSMakeRect(w - radius, h - radius, radius, radius));
   }
 }
 // This is the analog of nsChildView::MaybeDrawRoundedCorners for CGContexts.
 // We only need to mask the top corners here because Cocoa does the masking
 // for the window's bottom corners automatically (starting with 10.7).
 - (void)maskTopCornersInContext:(CGContextRef)aContext
 {
   CGFloat radius = [self cornerRadius];
   int32_t devPixelCornerRadius = mGeckoChild->CocoaPointsToDevPixels(radius);
   // First make sure that mTopLeftCornerMask is set up.
   if (!mTopLeftCornerMask ||
       int32_t(CGImageGetWidth(mTopLeftCornerMask)) != devPixelCornerRadius) {
     CGImageRelease(mTopLeftCornerMask);
     CGColorSpaceRef rgb = CGColorSpaceCreateDeviceRGB();
     CGContextRef imgCtx = CGBitmapContextCreate(NULL,
                                                 devPixelCornerRadius,
                                                 devPixelCornerRadius,
 , devPixelCornerRadius * 4,
                                                 rgb, kCGImageAlphaPremultipliedFirst);
     CGColorSpaceRelease(rgb);
     DrawTopLeftCornerMask(imgCtx, devPixelCornerRadius);
     mTopLeftCornerMask = CGBitmapContextCreateImage(imgCtx);
     CGContextRelease(imgCtx);
   }
   // kCGBlendModeDestinationIn is the secret sauce which allows us to erase
   // already painted pixels. It's defined as R = D * Sa: multiply all channels
   // of the destination pixel with the alpha of the source pixel. In our case,
   // the source is mTopLeftCornerMask.
   CGContextSaveGState(aContext);
   CGContextSetBlendMode(aContext, kCGBlendModeDestinationIn);
   CGRect destRect = CGRectMake(0, 0, radius, radius);
   // Erase the top left corner...
   CGContextDrawImage(aContext, destRect, mTopLeftCornerMask);
   // ... and the top right corner.
   CGContextTranslateCTM(aContext, [self bounds].size.width, 0);
   CGContextScaleCTM(aContext, -1, 1);
   CGContextDrawImage(aContext, destRect, mTopLeftCornerMask);
   CGContextRestoreGState(aContext);
 }
 - (void)drawTitleString
 {
   BaseWindow* window = (BaseWindow*)[self window];
   if (![window wantsTitleDrawn]) {
     return;
   }
   NSView* frameView = [[window contentView] superview];
   if (![frameView respondsToSelector:@selector(_drawTitleBar:)]) {
     return;
   }
   NSGraphicsContext* oldContext = [NSGraphicsContext currentContext];
   CGContextRef ctx = (CGContextRef)[oldContext graphicsPort];
   CGContextSaveGState(ctx);
   if ([oldContext isFlipped] != [frameView isFlipped]) {
     CGContextTranslateCTM(ctx, 0, [self bounds].size.height);
     CGContextScaleCTM(ctx, 1, -1);
   }
   [NSGraphicsContext setCurrentContext:[NSGraphicsContext graphicsContextWithGraphicsPort:ctx flipped:[frameView isFlipped]]];
   [frameView _drawTitleBar:[frameView bounds]];
   CGContextRestoreGState(ctx);
   [NSGraphicsContext setCurrentContext:oldContext];
 }
 - (void)drawTitlebarHighlight
 {
   DrawTitlebarHighlight([self bounds].size, [self cornerRadius],
                         mGeckoChild->DevPixelsToCocoaPoints(1));
 }
 - (void)releaseWidgets:(NSArray*)aWidgetArray
 {
   if (!aWidgetArray) {
     return;
   }
   NSInteger count = [aWidgetArray count];
   for (NSInteger i = 0; i < count; ++i) {
     NSNumber* pointer = (NSNumber*) [aWidgetArray objectAtIndex:i];
     nsIWidget* widget = (nsIWidget*) [pointer unsignedIntegerValue];
     NS_RELEASE(widget);
   }
 }
 - (void)viewWillDraw
 {
   if (mGeckoChild) {
     // The OS normally *will* draw our NSWindow, no matter what we do here.
     // But Gecko can delete our parent widget(s) (along with mGeckoChild)
     // while processing a paint request, which closes our NSWindow and
     // makes the OS throw an NSInternalInconsistencyException assertion when
     // it tries to draw it.  Sometimes the OS also aborts the browser process.
     // So we need to retain our parent(s) here and not release it/them until
     // the next time through the main thread's run loop.  When we do this we
     // also need to retain and release mGeckoChild, which holds a strong
     // reference to us (otherwise we might have been deleted by the time
     // releaseWidgets: is called on us).  See bug 550392.
     nsIWidget* parent = mGeckoChild->GetParent();
     if (parent) {
       NSMutableArray* widgetArray = [NSMutableArray arrayWithCapacity:3];
       while (parent) {
         NS_ADDREF(parent);
         [widgetArray addObject:[NSNumber numberWithUnsignedInteger:(NSUInteger)parent]];
         parent = parent->GetParent();
       }
       NS_ADDREF(mGeckoChild);
       [widgetArray addObject:[NSNumber numberWithUnsignedInteger:(NSUInteger)mGeckoChild]];
       [self performSelector:@selector(releaseWidgets:)
                  withObject:widgetArray
                  afterDelay:0];
     }
     if ([self isUsingOpenGL]) {
       // When our view covers the titlebar, we need to repaint the titlebar
       // texture buffer when, for example, the window buttons are hovered.
       // So we notify our nsChildView about any areas needing repainting.
       mGeckoChild->NotifyDirtyRegion([self nativeDirtyRegionWithBoundingRect:[self bounds]]);
       if (mGeckoChild->GetLayerManager()->GetBackendType() == LayersBackend::LAYERS_CLIENT) {
         ClientLayerManager *manager = static_cast<ClientLayerManager*>(mGeckoChild->GetLayerManager());
         manager->AsShadowForwarder()->WindowOverlayChanged();
       }
     }
     mGeckoChild->WillPaintWindow();
   }
   [super viewWillDraw];
 }
 #if USE_CLICK_HOLD_CONTEXTMENU
 //
 // -clickHoldCallback:
 //
 // called from a timer two seconds after a mouse down to see if we should display
 // a context menu (click-hold). |anEvent| is the original mouseDown event. If we're
 // still in that mouseDown by this time, put up the context menu, otherwise just
 // fuhgeddaboutit. |anEvent| has been retained by the OS until after this callback
 // fires so we're ok there.
 //
 // This code currently messes in a bunch of edge cases (bugs 234751, 232964, 232314)
 // so removing it until we get it straightened out.
 //
 - (void)clickHoldCallback:(id)theEvent;
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if( theEvent == [NSApp currentEvent] ) {
     // we're still in the middle of the same mousedown event here, activate
     // click-hold context menu by triggering the right mouseDown action.
     NSEvent* clickHoldEvent = [NSEvent mouseEventWithType:NSRightMouseDown
                                                   location:[theEvent locationInWindow]
                                              modifierFlags:[theEvent modifierFlags]
                                                  timestamp:[theEvent timestamp]
                                               windowNumber:[theEvent windowNumber]
                                                    context:[theEvent context]
                                                eventNumber:[theEvent eventNumber]
                                                 clickCount:[theEvent clickCount]
                                                   pressure:[theEvent pressure]];
     [self rightMouseDown:clickHoldEvent];
   }
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 #endif
 // If we've just created a non-native context menu, we need to mark it as
 // such and let the OS (and other programs) know when it opens and closes
 // (this is how the OS knows to close other programs' context menus when
 // ours open).  We send the initial notification here, but others are sent
 // in nsCocoaWindow::Show().
 - (void)maybeInitContextMenuTracking
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
 #ifdef MOZ_USE_NATIVE_POPUP_WINDOWS
   return;
 #endif /* MOZ_USE_NATIVE_POPUP_WINDOWS */
   nsIRollupListener* rollupListener = nsBaseWidget::GetActiveRollupListener();
   NS_ENSURE_TRUE_VOID(rollupListener);
   nsCOMPtr<nsIWidget> widget = rollupListener->GetRollupWidget();
   NS_ENSURE_TRUE_VOID(widget);
   NSWindow *popupWindow = (NSWindow*)widget->GetNativeData(NS_NATIVE_WINDOW);
   if (!popupWindow || ![popupWindow isKindOfClass:[PopupWindow class]])
     return;
   [[NSDistributedNotificationCenter defaultCenter]
     postNotificationName:@"com.apple.HIToolbox.beginMenuTrackingNotification"
                   object:@"org.mozilla.gecko.PopupWindow"];
   [(PopupWindow*)popupWindow setIsContextMenu:YES];
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 // Returns true if the event should no longer be processed, false otherwise.
 // This does not return whether or not anything was rolled up.
 - (BOOL)maybeRollup:(NSEvent*)theEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
   BOOL consumeEvent = NO;
   nsIRollupListener* rollupListener = nsBaseWidget::GetActiveRollupListener();
   NS_ENSURE_TRUE(rollupListener, false);
   nsCOMPtr<nsIWidget> rollupWidget = rollupListener->GetRollupWidget();
   if (rollupWidget) {
     NSWindow* currentPopup = static_cast<NSWindow*>(rollupWidget->GetNativeData(NS_NATIVE_WINDOW));
     if (!nsCocoaUtils::IsEventOverWindow(theEvent, currentPopup)) {
       // event is not over the rollup window, default is to roll up
       bool shouldRollup = true;
       // check to see if scroll events should roll up the popup
       if ([theEvent type] == NSScrollWheel) {
         shouldRollup = rollupListener->ShouldRollupOnMouseWheelEvent();
         // consume scroll events that aren't over the popup
         // unless the popup is an arrow panel
         consumeEvent = rollupListener->ShouldConsumeOnMouseWheelEvent();
       }
       // if we're dealing with menus, we probably have submenus and
       // we don't want to rollup if the click is in a parent menu of
       // the current submenu
       uint32_t popupsToRollup = UINT32_MAX;
       nsAutoTArray<nsIWidget*, 5> widgetChain;
       uint32_t sameTypeCount = rollupListener->GetSubmenuWidgetChain(&widgetChain);
       for (uint32_t i = 0; i < widgetChain.Length(); i++) {
         nsIWidget* widget = widgetChain[i];
         NSWindow* currWindow = (NSWindow*)widget->GetNativeData(NS_NATIVE_WINDOW);
         if (nsCocoaUtils::IsEventOverWindow(theEvent, currWindow)) {
           // don't roll up if the mouse event occurred within a menu of the
           // same type. If the mouse event occurred in a menu higher than
           // that, roll up, but pass the number of popups to Rollup so
           // that only those of the same type close up.
           if (i < sameTypeCount) {
             shouldRollup = false;
           }
           else {
             popupsToRollup = sameTypeCount;
           }
           break;
         }
       }
       if (shouldRollup) {
         if ([theEvent type] == NSLeftMouseDown) {
           NSPoint point = [NSEvent mouseLocation];
           FlipCocoaScreenCoordinate(point);
           nsIntPoint pos(point.x, point.y);
           consumeEvent = (BOOL)rollupListener->Rollup(popupsToRollup, &pos, nullptr);
         }
         else {
           consumeEvent = (BOOL)rollupListener->Rollup(popupsToRollup, nullptr, nullptr);
         }
       }
     }
   }
   return consumeEvent;
   NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(NO);
 }
 /*
  * In OS X Mountain Lion and above, smart zoom gestures are implemented in
  * smartMagnifyWithEvent. In OS X Lion, they are implemented in
  * magnifyWithEvent. See inline comments for more info.
  *
  * The prototypes swipeWithEvent, beginGestureWithEvent, magnifyWithEvent,
  * smartMagnifyWithEvent, rotateWithEvent, and endGestureWithEvent were
  * obtained from the following links:
  * https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ApplicationKit/Classes/NSResponder_Class/Reference/Reference.html
  * https://developer.apple.com/library/mac/#releasenotes/Cocoa/AppKit.html
  */
 - (void)swipeWithEvent:(NSEvent *)anEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (!anEvent || !mGeckoChild)
     return;
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   float deltaX = [anEvent deltaX];  // left=1.0, right=-1.0
   float deltaY = [anEvent deltaY];  // up=1.0, down=-1.0
   // Setup the "swipe" event.
   WidgetSimpleGestureEvent geckoEvent(true, NS_SIMPLE_GESTURE_SWIPE,
                                       mGeckoChild);
   [self convertCocoaMouseEvent:anEvent toGeckoEvent:&geckoEvent];
   // Record the left/right direction.
   if (deltaX > 0.0)
     geckoEvent.direction |= nsIDOMSimpleGestureEvent::DIRECTION_LEFT;
   else if (deltaX < 0.0)
     geckoEvent.direction |= nsIDOMSimpleGestureEvent::DIRECTION_RIGHT;
   // Record the up/down direction.
   if (deltaY > 0.0)
     geckoEvent.direction |= nsIDOMSimpleGestureEvent::DIRECTION_UP;
   else if (deltaY < 0.0)
     geckoEvent.direction |= nsIDOMSimpleGestureEvent::DIRECTION_DOWN;
   // Send the event.
   mGeckoChild->DispatchWindowEvent(geckoEvent);
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)beginGestureWithEvent:(NSEvent *)anEvent
 {
   if (!anEvent)
     return;
   mGestureState = eGestureState_StartGesture;
   mCumulativeMagnification = 0;
   mCumulativeRotation = 0.0;
 }
 - (void)magnifyWithEvent:(NSEvent *)anEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (!anEvent || !mGeckoChild)
     return;
   /*
    * In OS X 10.7.* (Lion), smart zoom events come through magnifyWithEvent,
    * instead of smartMagnifyWithEvent. See bug 863841.
    */
   if ([ChildView isLionSmartMagnifyEvent: anEvent]) {
     [self smartMagnifyWithEvent: anEvent];
     return;
   }
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   float deltaZ = [anEvent deltaZ];
   uint32_t msg;
   switch (mGestureState) {
   case eGestureState_StartGesture:
     msg = NS_SIMPLE_GESTURE_MAGNIFY_START;
     mGestureState = eGestureState_MagnifyGesture;
     break;
   case eGestureState_MagnifyGesture:
     msg = NS_SIMPLE_GESTURE_MAGNIFY_UPDATE;
     break;
   case eGestureState_None:
   case eGestureState_RotateGesture:
   default:
     return;
   }
   // Setup the event.
   WidgetSimpleGestureEvent geckoEvent(true, msg, mGeckoChild);
   geckoEvent.delta = deltaZ;
   [self convertCocoaMouseEvent:anEvent toGeckoEvent:&geckoEvent];
   // Send the event.
   mGeckoChild->DispatchWindowEvent(geckoEvent);
   // Keep track of the cumulative magnification for the final "magnify" event.
   mCumulativeMagnification += deltaZ;
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)smartMagnifyWithEvent:(NSEvent *)anEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (!anEvent || !mGeckoChild) {
     return;
   }
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   // Setup the "double tap" event.
   WidgetSimpleGestureEvent geckoEvent(true, NS_SIMPLE_GESTURE_TAP,
                                       mGeckoChild);
   [self convertCocoaMouseEvent:anEvent toGeckoEvent:&geckoEvent];
   geckoEvent.clickCount = 1;
   // Send the event.
   mGeckoChild->DispatchWindowEvent(geckoEvent);
   // Clear the gesture state
   mGestureState = eGestureState_None;
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)rotateWithEvent:(NSEvent *)anEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (!anEvent || !mGeckoChild)
     return;
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   float rotation = [anEvent rotation];
   uint32_t msg;
   switch (mGestureState) {
   case eGestureState_StartGesture:
     msg = NS_SIMPLE_GESTURE_ROTATE_START;
     mGestureState = eGestureState_RotateGesture;
     break;
   case eGestureState_RotateGesture:
     msg = NS_SIMPLE_GESTURE_ROTATE_UPDATE;
     break;
   case eGestureState_None:
   case eGestureState_MagnifyGesture:
   default:
     return;
   }
   // Setup the event.
   WidgetSimpleGestureEvent geckoEvent(true, msg, mGeckoChild);
   [self convertCocoaMouseEvent:anEvent toGeckoEvent:&geckoEvent];
   geckoEvent.delta = -rotation;
   if (rotation > 0.0) {
     geckoEvent.direction = nsIDOMSimpleGestureEvent::ROTATION_COUNTERCLOCKWISE;
   } else {
     geckoEvent.direction = nsIDOMSimpleGestureEvent::ROTATION_CLOCKWISE;
   }
   // Send the event.
   mGeckoChild->DispatchWindowEvent(geckoEvent);
   // Keep track of the cumulative rotation for the final "rotate" event.
   mCumulativeRotation += rotation;
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)endGestureWithEvent:(NSEvent *)anEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (!anEvent || !mGeckoChild) {
     // Clear the gestures state if we cannot send an event.
     mGestureState = eGestureState_None;
     mCumulativeMagnification = 0.0;
     mCumulativeRotation = 0.0;
     return;
   }
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   switch (mGestureState) {
   case eGestureState_MagnifyGesture:
     {
       // Setup the "magnify" event.
       WidgetSimpleGestureEvent geckoEvent(true, NS_SIMPLE_GESTURE_MAGNIFY,
                                           mGeckoChild);
       geckoEvent.delta = mCumulativeMagnification;
       [self convertCocoaMouseEvent:anEvent toGeckoEvent:&geckoEvent];
       // Send the event.
       mGeckoChild->DispatchWindowEvent(geckoEvent);
     }
     break;
   case eGestureState_RotateGesture:
     {
       // Setup the "rotate" event.
       WidgetSimpleGestureEvent geckoEvent(true, NS_SIMPLE_GESTURE_ROTATE,
                                           mGeckoChild);
       [self convertCocoaMouseEvent:anEvent toGeckoEvent:&geckoEvent];
       geckoEvent.delta = -mCumulativeRotation;
       if (mCumulativeRotation > 0.0) {
         geckoEvent.direction = nsIDOMSimpleGestureEvent::ROTATION_COUNTERCLOCKWISE;
       } else {
         geckoEvent.direction = nsIDOMSimpleGestureEvent::ROTATION_CLOCKWISE;
       }
       // Send the event.
       mGeckoChild->DispatchWindowEvent(geckoEvent);
     }
     break;
   case eGestureState_None:
   case eGestureState_StartGesture:
   default:
     break;
   }
   // Clear the gestures state.
   mGestureState = eGestureState_None;
   mCumulativeMagnification = 0.0;
   mCumulativeRotation = 0.0;
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 + (BOOL)isLionSmartMagnifyEvent:(NSEvent*)anEvent
 {
   /*
    * On Lion, smart zoom events have type NSEventTypeGesture, subtype 0x16,
    * whereas pinch zoom events have type NSEventTypeMagnify. So, use that to
    * discriminate between the two. Smart zoom gestures do not call
    * beginGestureWithEvent or endGestureWithEvent, so mGestureState is not
    * changed. Documentation couldn't be found for the meaning of the subtype
    * 0x16, but it will probably never change. See bug 863841.
    */
   return nsCocoaFeatures::OnLionOrLater() &&
          !nsCocoaFeatures::OnMountainLionOrLater() &&
          [anEvent type] == NSEventTypeGesture &&
          [anEvent subtype] == 0x16;
 }
 #ifdef __LP64__
 - (bool)sendSwipeEvent:(NSEvent*)aEvent
                 withKind:(uint32_t)aMsg
        allowedDirections:(uint32_t*)aAllowedDirections
                direction:(uint32_t)aDirection
                    delta:(double)aDelta
 {
   if (!mGeckoChild)
     return false;
   WidgetSimpleGestureEvent geckoEvent(true, aMsg, mGeckoChild);
   geckoEvent.direction = aDirection;
   geckoEvent.delta = aDelta;
   geckoEvent.allowedDirections = *aAllowedDirections;
   [self convertCocoaMouseEvent:aEvent toGeckoEvent:&geckoEvent];
   bool eventCancelled = mGeckoChild->DispatchWindowEvent(geckoEvent);
   *aAllowedDirections = geckoEvent.allowedDirections;
   return eventCancelled; // event cancelled == swipe should start
 }
 - (void)sendSwipeEndEvent:(NSEvent *)anEvent
         allowedDirections:(uint32_t)aAllowedDirections
 {
     // Tear down animation overlay by sending a swipe end event.
     uint32_t allowedDirectionsCopy = aAllowedDirections;
     [self sendSwipeEvent:anEvent
                 withKind:NS_SIMPLE_GESTURE_SWIPE_END
        allowedDirections:&allowedDirectionsCopy
                direction:0
                    delta:0.0];
 }
 // Support fluid swipe tracking on OS X 10.7 and higher. We must be careful
 // to only invoke this support on a two-finger gesture that really
 // is a swipe (and not a scroll) -- in other words, the app is responsible
 // for deciding which is which. But once the decision is made, the OS tracks
 // the swipe until it has finished, and decides whether or not it succeeded.
 // A horizontal swipe has the same functionality as the Back and Forward
 // buttons.
 // This method is partly based on Apple sample code available at
 // developer.apple.com/library/mac/#releasenotes/Cocoa/AppKitOlderNotes.html
 // (under Fluid Swipe Tracking API).
 - (void)maybeTrackScrollEventAsSwipe:(NSEvent *)anEvent
                      scrollOverflowX:(double)anOverflowX
                      scrollOverflowY:(double)anOverflowY
               viewPortIsOverscrolled:(BOOL)aViewPortIsOverscrolled
 {
   if (!nsCocoaFeatures::OnLionOrLater()) {
     return;
   }
   // This method checks whether the AppleEnableSwipeNavigateWithScrolls global
   // preference is set.  If it isn't, fluid swipe tracking is disabled, and a
   // horizontal two-finger gesture is always a scroll (even in Safari).  This
   // preference can't (currently) be set from the Preferences UI -- only using
   // 'defaults write'.
   if (![NSEvent isSwipeTrackingFromScrollEventsEnabled]) {
     return;
   }
   // We should only track scroll events as swipe if the viewport is being
   // overscrolled.
   if (!aViewPortIsOverscrolled) {
     return;
   }
   // Verify that this is a scroll wheel event with proper phase to be tracked
   // by the OS.
   if ([anEvent type] != NSScrollWheel || [anEvent phase] == NSEventPhaseNone) {
     return;
   }
   // Only initiate tracking if the user has tried to scroll past the edge of
   // the current page (as indicated by 'anOverflowX' or 'anOverflowY' being
   // non-zero). Gecko only sets WidgetMouseScrollEvent.scrollOverflow when it's
   // processing NS_MOUSE_PIXEL_SCROLL events (not NS_MOUSE_SCROLL events).
   if (anOverflowX == 0.0 && anOverflowY == 0.0) {
     return;
   }
   CGFloat deltaX, deltaY;
   if ([anEvent hasPreciseScrollingDeltas]) {
     deltaX = [anEvent scrollingDeltaX];
     deltaY = [anEvent scrollingDeltaY];
   } else {
     return;
   }
   uint32_t vDirs = (uint32_t)nsIDOMSimpleGestureEvent::DIRECTION_DOWN |
                    (uint32_t)nsIDOMSimpleGestureEvent::DIRECTION_UP;
   uint32_t direction = 0;
   // Only initiate horizontal tracking for events whose horizontal element is
   // at least eight times larger than its vertical element. This minimizes
   // performance problems with vertical scrolls (by minimizing the possibility
   // that they'll be misinterpreted as horizontal swipes), while still
   // tolerating a small vertical element to a true horizontal swipe.  The number
   // '8' was arrived at by trial and error.
   if (anOverflowX != 0.0 && deltaX != 0.0 &&
       fabsf(deltaX) > fabsf(deltaY) * 8) {
     // Only initiate horizontal tracking for gestures that have just begun --
     // otherwise a scroll to one side of the page can have a swipe tacked on
     // to it.
     if ([anEvent phase] != NSEventPhaseBegan) {
       return;
     }
     if (deltaX < 0.0) {
       direction = (uint32_t)nsIDOMSimpleGestureEvent::DIRECTION_RIGHT;
     } else {
       direction = (uint32_t)nsIDOMSimpleGestureEvent::DIRECTION_LEFT;
     }
   }
   // Only initiate vertical tracking for events whose vertical element is
   // at least two times larger than its horizontal element. This minimizes
   // performance problems. The number '2' was arrived at by trial and error.
   else if (anOverflowY != 0.0 && deltaY != 0.0 &&
            fabsf(deltaY) > fabsf(deltaX) * 2) {
     if (deltaY < 0.0) {
       direction = (uint32_t)nsIDOMSimpleGestureEvent::DIRECTION_DOWN;
     } else {
       direction = (uint32_t)nsIDOMSimpleGestureEvent::DIRECTION_UP;
     }
     if ((mCurrentSwipeDir & vDirs) && (mCurrentSwipeDir != direction)) {
       // If a swipe is currently being tracked kill it -- it's been interrupted
       // by another gesture event.
       if (mCancelSwipeAnimation && *mCancelSwipeAnimation == NO) {
         *mCancelSwipeAnimation = YES;
         mCancelSwipeAnimation = nil;
         [self sendSwipeEndEvent:anEvent allowedDirections:0];
       }
       return;
     }
   } else {
     return;
   }
   // Track the direction we're going in.
   mCurrentSwipeDir = direction;
   uint32_t allowedDirections = 0;
   // We're ready to start the animation. Tell Gecko about it, and at the same
   // time ask it if it really wants to start an animation for this event.
   // This event also reports back the directions that we can swipe in.
   bool shouldStartSwipe = [self sendSwipeEvent:anEvent
                                       withKind:NS_SIMPLE_GESTURE_SWIPE_START
                              allowedDirections:&allowedDirections
                                      direction:direction
                                          delta:0.0];
   if (!shouldStartSwipe) {
     return;
   }
   // If a swipe is currently being tracked kill it -- it's been interrupted
   // by another gesture event.
   if (mCancelSwipeAnimation && *mCancelSwipeAnimation == NO) {
     *mCancelSwipeAnimation = YES;
     mCancelSwipeAnimation = nil;
   }
   CGFloat min = 0.0;
   CGFloat max = 0.0;
   if (!(direction & vDirs)) {
     min = (allowedDirections & nsIDOMSimpleGestureEvent::DIRECTION_RIGHT) ?
           -1.0 : 0.0;
     max = (allowedDirections & nsIDOMSimpleGestureEvent::DIRECTION_LEFT) ?
 .0 : 0.0;
   }
   __block BOOL animationCanceled = NO;
   __block BOOL geckoSwipeEventSent = NO;
   // At this point, anEvent is the first scroll wheel event in a two-finger
   // horizontal gesture that we've decided to treat as a swipe.  When we call
   // [NSEvent trackSwipeEventWithOptions:...], the OS interprets all
   // subsequent scroll wheel events that are part of this gesture as a swipe,
   // and stops sending them to us.  The OS calls the trackingHandler "block"
   // multiple times, asynchronously (sometimes after [NSEvent
   // maybeTrackScrollEventAsSwipe:...] has returned).  The OS determines when
   // the gesture has finished, and whether or not it was "successful" -- this
   // information is passed to trackingHandler.  We must be careful to only
   // call [NSEvent maybeTrackScrollEventAsSwipe:...] on a "real" swipe --
   // otherwise two-finger scrolling performance will suffer significantly.
   // Note that we use anEvent inside the block. This extends the lifetime of
   // the anEvent object because it's retained by the block, see bug 682445.
   // The block will release it when the block goes away at the end of the
   // animation, or when the animation is canceled.
   [anEvent trackSwipeEventWithOptions:NSEventSwipeTrackingLockDirection |
                                       NSEventSwipeTrackingClampGestureAmount
              dampenAmountThresholdMin:min
                                   max:max
                          usingHandler:^(CGFloat gestureAmount,
                                         NSEventPhase phase,
                                         BOOL isComplete,
                                         BOOL *stop) {
     uint32_t allowedDirectionsCopy = allowedDirections;
     // Since this tracking handler can be called asynchronously, mGeckoChild
     // might have become NULL here (our child widget might have been
     // destroyed).
     // Checking for gestureAmount == 0.0 also works around bug 770626, which
     // happens when DispatchWindowEvent() triggers a modal dialog, which spins
     // the event loop and confuses the OS. This results in several re-entrant
     // calls to this handler.
     if (animationCanceled || !mGeckoChild || gestureAmount == 0.0) {
       *stop = YES;
       animationCanceled = YES;
       if (gestureAmount == 0.0 ||
           ((direction & vDirs) && (direction != mCurrentSwipeDir))) {
         if (mCancelSwipeAnimation)
           *mCancelSwipeAnimation = YES;
         mCancelSwipeAnimation = nil;
         [self sendSwipeEndEvent:anEvent
               allowedDirections:allowedDirectionsCopy];
       }
       mCurrentSwipeDir = 0;
       return;
     }
     // Update animation overlay to match gestureAmount.
     [self sendSwipeEvent:anEvent
                 withKind:NS_SIMPLE_GESTURE_SWIPE_UPDATE
        allowedDirections:&allowedDirectionsCopy
                direction:0.0
                    delta:gestureAmount];
     if (phase == NSEventPhaseEnded && !geckoSwipeEventSent) {
       // The result of the swipe is now known, so the main event can be sent.
       // The animation might continue even after this event was sent, so
       // don't tear down the animation overlay yet.
       uint32_t directionCopy = direction;
       // gestureAmount is documented to be '-1', '0' or '1' when isComplete
       // is TRUE, but the docs don't say anything about its value at other
       // times.  However, tests show that, when phase == NSEventPhaseEnded,
       // gestureAmount is negative when it will be '-1' at isComplete, and
       // positive when it will be '1'.  And phase is never equal to
       // NSEventPhaseEnded when gestureAmount will be '0' at isComplete.
       geckoSwipeEventSent = YES;
       [self sendSwipeEvent:anEvent
                   withKind:NS_SIMPLE_GESTURE_SWIPE
          allowedDirections:&allowedDirectionsCopy
                  direction:directionCopy
                      delta:0.0];
     }
     if (isComplete) {
       [self sendSwipeEndEvent:anEvent allowedDirections:allowedDirectionsCopy];
       mCurrentSwipeDir = 0;
       mCancelSwipeAnimation = nil;
     }
   }];
   mCancelSwipeAnimation = &animationCanceled;
 }
 #endif // #ifdef __LP64__
 - (void)setUsingOMTCompositor:(BOOL)aUseOMTC
 {
   mUsingOMTCompositor = aUseOMTC;
 }
 // Returning NO from this method only disallows ordering on mousedown - in order
 // to prevent it for mouseup too, we need to call [NSApp preventWindowOrdering]
 // when handling the mousedown event.
 - (BOOL)shouldDelayWindowOrderingForEvent:(NSEvent*)aEvent
 {
   // Always using system-provided window ordering for normal windows.
   if (![[self window] isKindOfClass:[PopupWindow class]])
     return NO;
   // Don't reorder when we don't have a parent window, like when we're a
   // context menu or a tooltip.
   return ![[self window] parentWindow];
 }
 - (void)mouseDown:(NSEvent*)theEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if ([self shouldDelayWindowOrderingForEvent:theEvent]) {
     [NSApp preventWindowOrdering];
   }
   // If we've already seen this event due to direct dispatch from menuForEvent:
   // just bail; if not, remember it.
   if (mLastMouseDownEvent == theEvent) {
     [mLastMouseDownEvent release];
     mLastMouseDownEvent = nil;
     return;
   }
   else {
     [mLastMouseDownEvent release];
     mLastMouseDownEvent = [theEvent retain];
   }
   [gLastDragMouseDownEvent release];
   gLastDragMouseDownEvent = [theEvent retain];
   // We need isClickThrough because at this point the window we're in might
   // already have become main, so the check for isMainWindow in
   // WindowAcceptsEvent isn't enough. It also has to check isClickThrough.
   BOOL isClickThrough = (theEvent == mClickThroughMouseDownEvent);
   [mClickThroughMouseDownEvent release];
   mClickThroughMouseDownEvent = nil;
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   if ([self maybeRollup:theEvent] ||
       !ChildViewMouseTracker::WindowAcceptsEvent([self window], theEvent, self, isClickThrough)) {
     // Remember blocking because that means we want to block mouseup as well.
     mBlockedLastMouseDown = YES;
     return;
   }
 #if USE_CLICK_HOLD_CONTEXTMENU
   // fire off timer to check for click-hold after two seconds. retains |theEvent|
   [self performSelector:@selector(clickHoldCallback:) withObject:theEvent afterDelay:2.0];
 #endif
   // in order to send gecko events we'll need a gecko widget
   if (!mGeckoChild)
     return;
   NSUInteger modifierFlags = [theEvent modifierFlags];
   WidgetMouseEvent geckoEvent(true, NS_MOUSE_BUTTON_DOWN, mGeckoChild,
                               WidgetMouseEvent::eReal);
   [self convertCocoaMouseEvent:theEvent toGeckoEvent:&geckoEvent];
   NSInteger clickCount = [theEvent clickCount];
   if (mBlockedLastMouseDown && clickCount > 1) {
     // Don't send a double click if the first click of the double click was
     // blocked.
     clickCount--;
   }
   geckoEvent.clickCount = clickCount;
   if (modifierFlags & NSControlKeyMask)
     geckoEvent.button = WidgetMouseEvent::eRightButton;
   else
     geckoEvent.button = WidgetMouseEvent::eLeftButton;
   // Create event for use by plugins.
   // This is going to our child view so we don't need to look up the destination
   // event type.
   NPCocoaEvent cocoaEvent;
   ChildViewMouseTracker::AttachPluginEvent(geckoEvent, self, theEvent,
                                            NPCocoaEventMouseDown,
                                            &cocoaEvent);
   // Don't lose possible changes made above to clickCount
   cocoaEvent.data.mouse.clickCount = clickCount;
   mGeckoChild->DispatchWindowEvent(geckoEvent);
   mBlockedLastMouseDown = NO;
   // XXX maybe call markedTextSelectionChanged:client: here?
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)mouseUp:(NSEvent *)theEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (!mGeckoChild || mBlockedLastMouseDown)
     return;
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   NPCocoaEvent cocoaEvent;
   WidgetMouseEvent geckoEvent(true, NS_MOUSE_BUTTON_UP, mGeckoChild,
                               WidgetMouseEvent::eReal);
   [self convertCocoaMouseEvent:theEvent toGeckoEvent:&geckoEvent];
   if ([theEvent modifierFlags] & NSControlKeyMask)
     geckoEvent.button = WidgetMouseEvent::eRightButton;
   else
     geckoEvent.button = WidgetMouseEvent::eLeftButton;
   // Create event for use by plugins.
   // This is going to our child view so we don't need to look up the destination
   // event type.
   ChildViewMouseTracker::AttachPluginEvent(geckoEvent, self, theEvent,
                                            NPCocoaEventMouseUp,
                                            &cocoaEvent);
   // This might destroy our widget (and null out mGeckoChild).
   bool defaultPrevented = mGeckoChild->DispatchWindowEvent(geckoEvent);
   // Check to see if we are double-clicking in the titlebar.
   CGFloat locationInTitlebar = [[self window] frame].size.height - [theEvent locationInWindow].y;
   if (!defaultPrevented && [theEvent clickCount] == 2 &&
       [[self window] isMovableByWindowBackground] &&
       [self shouldMinimizeOnTitlebarDoubleClick] &&
       [[self window] isKindOfClass:[ToolbarWindow class]] &&
       (locationInTitlebar < [(ToolbarWindow*)[self window] titlebarHeight] ||
        locationInTitlebar < [(ToolbarWindow*)[self window] unifiedToolbarHeight])) {
     NSButton *minimizeButton = [[self window] standardWindowButton:NSWindowMiniaturizeButton];
     [minimizeButton performClick:self];
   }
   // If our mouse-up event's location is over some other object (as might
   // happen if it came at the end of a dragging operation), also send our
   // Gecko frame a mouse-exit event.
   if (mGeckoChild && mIsPluginView) {
     ChildViewMouseTracker::ReEvaluateMouseEnterState(theEvent, self);
   }
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)sendMouseEnterOrExitEvent:(NSEvent*)aEvent
                             enter:(BOOL)aEnter
                              type:(WidgetMouseEvent::exitType)aType
 {
   if (!mGeckoChild)
     return;
   NSPoint windowEventLocation = nsCocoaUtils::EventLocationForWindow(aEvent, [self window]);
   NSPoint localEventLocation = [self convertPoint:windowEventLocation fromView:nil];
   uint32_t msg = aEnter ? NS_MOUSE_ENTER : NS_MOUSE_EXIT;
   WidgetMouseEvent event(true, msg, mGeckoChild, WidgetMouseEvent::eReal);
   event.refPoint = LayoutDeviceIntPoint::FromUntyped(
     mGeckoChild->CocoaPointsToDevPixels(localEventLocation));
   // Create event for use by plugins.
   // This is going to our child view so we don't need to look up the destination
   // event type.
   NPCocoaEvent cocoaEvent;
   ChildViewMouseTracker::AttachPluginEvent(event, self, aEvent,
                                            (msg == NS_MOUSE_ENTER) ?
                                              NPCocoaEventMouseEntered : NPCocoaEventMouseExited,
                                            &cocoaEvent);
   event.exit = aType;
   nsEventStatus status; // ignored
   mGeckoChild->DispatchEvent(&event, status);
 }
 - (void)updateWindowDraggableStateOnMouseMove:(NSEvent*)theEvent
 {
   if (!theEvent || !mGeckoChild) {
     return;
   }
   nsCocoaWindow* windowWidget = mGeckoChild->GetXULWindowWidget();
   if (!windowWidget) {
     return;
   }
   // We assume later on that sending a hit test event won't cause widget destruction.
   WidgetMouseEvent hitTestEvent(true, NS_MOUSE_MOZHITTEST, mGeckoChild,
                                 WidgetMouseEvent::eReal);
   [self convertCocoaMouseEvent:theEvent toGeckoEvent:&hitTestEvent];
   bool result = mGeckoChild->DispatchWindowEvent(hitTestEvent);
   [windowWidget->GetCocoaWindow() setMovableByWindowBackground:result];
 }
 - (void)handleMouseMoved:(NSEvent*)theEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (!mGeckoChild)
     return;
   WidgetMouseEvent geckoEvent(true, NS_MOUSE_MOVE, mGeckoChild,
                               WidgetMouseEvent::eReal);
   [self convertCocoaMouseEvent:theEvent toGeckoEvent:&geckoEvent];
   // Create event for use by plugins.
   // This is going to our child view so we don't need to look up the destination
   // event type.
   NPCocoaEvent cocoaEvent;
   ChildViewMouseTracker::AttachPluginEvent(geckoEvent, self, theEvent,
                                            NPCocoaEventMouseMoved,
                                            &cocoaEvent);
   mGeckoChild->DispatchWindowEvent(geckoEvent);
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)mouseDragged:(NSEvent*)theEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (!mGeckoChild)
     return;
   gLastDragView = self;
   NPCocoaEvent cocoaEvent;
   WidgetMouseEvent geckoEvent(true, NS_MOUSE_MOVE, mGeckoChild,
                               WidgetMouseEvent::eReal);
   [self convertCocoaMouseEvent:theEvent toGeckoEvent:&geckoEvent];
   // create event for use by plugins
   ChildViewMouseTracker::AttachPluginEvent(geckoEvent, self, theEvent,
                                            NPCocoaEventMouseDragged,
                                            &cocoaEvent);
   mGeckoChild->DispatchWindowEvent(geckoEvent);
   // Note, sending the above event might have destroyed our widget since we didn't retain.
   // Fine so long as we don't access any local variables from here on.
   gLastDragView = nil;
   // XXX maybe call markedTextSelectionChanged:client: here?
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)rightMouseDown:(NSEvent *)theEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   [self maybeRollup:theEvent];
   if (!mGeckoChild)
     return;
   // The right mouse went down, fire off a right mouse down event to gecko
   WidgetMouseEvent geckoEvent(true, NS_MOUSE_BUTTON_DOWN, mGeckoChild,
                               WidgetMouseEvent::eReal);
   [self convertCocoaMouseEvent:theEvent toGeckoEvent:&geckoEvent];
   geckoEvent.button = WidgetMouseEvent::eRightButton;
   geckoEvent.clickCount = [theEvent clickCount];
   // create event for use by plugins
   NPCocoaEvent cocoaEvent;
   ChildViewMouseTracker::AttachPluginEvent(geckoEvent, self, theEvent,
                                            NPCocoaEventMouseDown,
                                            &cocoaEvent);
   mGeckoChild->DispatchWindowEvent(geckoEvent);
   if (!mGeckoChild)
     return;
   // Let the superclass do the context menu stuff.
   [super rightMouseDown:theEvent];
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)rightMouseUp:(NSEvent *)theEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (!mGeckoChild)
     return;
   NPCocoaEvent cocoaEvent;
   WidgetMouseEvent geckoEvent(true, NS_MOUSE_BUTTON_UP, mGeckoChild,
                               WidgetMouseEvent::eReal);
   [self convertCocoaMouseEvent:theEvent toGeckoEvent:&geckoEvent];
   geckoEvent.button = WidgetMouseEvent::eRightButton;
   geckoEvent.clickCount = [theEvent clickCount];
   // create event for use by plugins
   ChildViewMouseTracker::AttachPluginEvent(geckoEvent, self, theEvent,
                                            NPCocoaEventMouseUp,
                                            &cocoaEvent);
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   mGeckoChild->DispatchWindowEvent(geckoEvent);
   // If our mouse-up event's location is over some other object (as might
   // happen if it came at the end of a dragging operation), also send our
   // Gecko frame a mouse-exit event.
   if (mGeckoChild && mIsPluginView) {
     ChildViewMouseTracker::ReEvaluateMouseEnterState(theEvent, self);
   }
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)rightMouseDragged:(NSEvent*)theEvent
 {
   if (!mGeckoChild)
     return;
   WidgetMouseEvent geckoEvent(true, NS_MOUSE_MOVE, mGeckoChild,
                               WidgetMouseEvent::eReal);
   [self convertCocoaMouseEvent:theEvent toGeckoEvent:&geckoEvent];
   geckoEvent.button = WidgetMouseEvent::eRightButton;
   // create event for use by plugins
   NPCocoaEvent cocoaEvent;
   ChildViewMouseTracker::AttachPluginEvent(geckoEvent, self, theEvent,
                                            NPCocoaEventMouseDragged,
                                            &cocoaEvent);
   // send event into Gecko by going directly to the
   // the widget.
   mGeckoChild->DispatchWindowEvent(geckoEvent);
 }
 - (void)otherMouseDown:(NSEvent *)theEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   if ([self maybeRollup:theEvent] ||
       !ChildViewMouseTracker::WindowAcceptsEvent([self window], theEvent, self))
     return;
   if (!mGeckoChild)
     return;
   WidgetMouseEvent geckoEvent(true, NS_MOUSE_BUTTON_DOWN, mGeckoChild,
                               WidgetMouseEvent::eReal);
   [self convertCocoaMouseEvent:theEvent toGeckoEvent:&geckoEvent];
   geckoEvent.button = WidgetMouseEvent::eMiddleButton;
   geckoEvent.clickCount = [theEvent clickCount];
   // create event for use by plugins
   NPCocoaEvent cocoaEvent;
   ChildViewMouseTracker::AttachPluginEvent(geckoEvent, self, theEvent,
                                            NPCocoaEventMouseDown,
                                            &cocoaEvent);
   mGeckoChild->DispatchWindowEvent(geckoEvent);
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)otherMouseUp:(NSEvent *)theEvent
 {
   if (!mGeckoChild)
     return;
   WidgetMouseEvent geckoEvent(true, NS_MOUSE_BUTTON_UP, mGeckoChild,
                               WidgetMouseEvent::eReal);
   [self convertCocoaMouseEvent:theEvent toGeckoEvent:&geckoEvent];
   geckoEvent.button = WidgetMouseEvent::eMiddleButton;
   // create event for use by plugins
   NPCocoaEvent cocoaEvent;
   ChildViewMouseTracker::AttachPluginEvent(geckoEvent, self, theEvent,
                                            NPCocoaEventMouseUp,
                                            &cocoaEvent);
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   mGeckoChild->DispatchWindowEvent(geckoEvent);
   // If our mouse-up event's location is over some other object (as might
   // happen if it came at the end of a dragging operation), also send our
   // Gecko frame a mouse-exit event.
   if (mGeckoChild && mIsPluginView) {
     ChildViewMouseTracker::ReEvaluateMouseEnterState(theEvent, self);
   }
 }
 - (void)otherMouseDragged:(NSEvent*)theEvent
 {
   if (!mGeckoChild)
     return;
   WidgetMouseEvent geckoEvent(true, NS_MOUSE_MOVE, mGeckoChild,
                               WidgetMouseEvent::eReal);
   [self convertCocoaMouseEvent:theEvent toGeckoEvent:&geckoEvent];
   geckoEvent.button = WidgetMouseEvent::eMiddleButton;
   // create event for use by plugins
   NPCocoaEvent cocoaEvent;
   ChildViewMouseTracker::AttachPluginEvent(geckoEvent, self, theEvent,
                                            NPCocoaEventMouseDragged,
                                            &cocoaEvent);
   // send event into Gecko by going directly to the
   // the widget.
   mGeckoChild->DispatchWindowEvent(geckoEvent);
 }
 static int32_t RoundUp(double aDouble)
 {
   return aDouble < 0 ? static_cast<int32_t>(floor(aDouble)) :
                        static_cast<int32_t>(ceil(aDouble));
 }
 - (void)sendWheelStartOrStop:(uint32_t)msg forEvent:(NSEvent *)theEvent
 {
   WidgetWheelEvent wheelEvent(true, msg, mGeckoChild);
   [self convertCocoaMouseWheelEvent:theEvent toGeckoEvent:&wheelEvent];
   mExpectingWheelStop = (msg == NS_WHEEL_START);
   mGeckoChild->DispatchWindowEvent(wheelEvent);
 }
 - (void)sendWheelCondition:(BOOL)condition first:(uint32_t)first second:(uint32_t)second forEvent:(NSEvent *)theEvent
 {
   if (mExpectingWheelStop == condition) {
     [self sendWheelStartOrStop:first forEvent:theEvent];
   }
   [self sendWheelStartOrStop:second forEvent:theEvent];
 }
 - (void)scrollWheel:(NSEvent*)theEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   ChildViewMouseTracker::MouseScrolled(theEvent);
   if ([self maybeRollup:theEvent]) {
     return;
   }
   if (!mGeckoChild) {
     return;
   }
   if (nsCocoaFeatures::OnLionOrLater()) {
     NSEventPhase phase = [theEvent phase];
     // Fire NS_WHEEL_START/STOP events when 2 fingers touch/release the touchpad.
     if (phase & NSEventPhaseMayBegin) {
       [self sendWheelCondition:YES first:NS_WHEEL_STOP second:NS_WHEEL_START forEvent:theEvent];
       return;
     }
     if (phase & (NSEventPhaseEnded | NSEventPhaseCancelled)) {
       [self sendWheelCondition:NO first:NS_WHEEL_START second:NS_WHEEL_STOP forEvent:theEvent];
       return;
     }
   }
   WidgetWheelEvent wheelEvent(true, NS_WHEEL_WHEEL, mGeckoChild);
   [self convertCocoaMouseWheelEvent:theEvent toGeckoEvent:&wheelEvent];
   wheelEvent.lineOrPageDeltaX = RoundUp(-[theEvent deltaX]);
   wheelEvent.lineOrPageDeltaY = RoundUp(-[theEvent deltaY]);
   if (wheelEvent.deltaMode == nsIDOMWheelEvent::DOM_DELTA_PIXEL) {
     // Some scrolling devices supports pixel scrolling, e.g. a Macbook
     // touchpad or a Mighty Mouse. On those devices, [theEvent deviceDeltaX/Y]
     // contains the amount of pixels to scroll. Since Lion this has changed
     // to [theEvent scrollingDeltaX/Y].
     double scale = mGeckoChild->BackingScaleFactor();
     if ([theEvent respondsToSelector:@selector(scrollingDeltaX)]) {
       wheelEvent.deltaX = -[theEvent scrollingDeltaX] * scale;
       wheelEvent.deltaY = -[theEvent scrollingDeltaY] * scale;
     } else {
       wheelEvent.deltaX = -[theEvent deviceDeltaX] * scale;
       wheelEvent.deltaY = -[theEvent deviceDeltaY] * scale;
     }
   } else {
     wheelEvent.deltaX = -[theEvent deltaX];
     wheelEvent.deltaY = -[theEvent deltaY];
   }
   // TODO: We should not set deltaZ for now because we're not sure if we should
   //       revert the sign.
   // wheelEvent.deltaZ = [theEvent deltaZ];
   if (!wheelEvent.deltaX && !wheelEvent.deltaY && !wheelEvent.deltaZ) {
     // No sense in firing off a Gecko event.
     return;
   }
   NPCocoaEvent cocoaEvent;
   ChildViewMouseTracker::AttachPluginEvent(wheelEvent, self, theEvent,
                                            NPCocoaEventScrollWheel,
                                            &cocoaEvent);
   mGeckoChild->DispatchWindowEvent(wheelEvent);
   if (!mGeckoChild) {
     return;
   }
 #ifdef __LP64__
   // overflowDeltaX and overflowDeltaY tell us when the user has tried to
   // scroll past the edge of a page (in those cases it's non-zero).
   if ((wheelEvent.deltaMode == nsIDOMWheelEvent::DOM_DELTA_PIXEL) &&
       (wheelEvent.deltaX != 0.0 || wheelEvent.deltaY != 0.0)) {
     [self maybeTrackScrollEventAsSwipe:theEvent
                        scrollOverflowX:wheelEvent.overflowDeltaX
                        scrollOverflowY:wheelEvent.overflowDeltaY
                 viewPortIsOverscrolled:wheelEvent.mViewPortIsOverscrolled];
   }
 #endif // #ifdef __LP64__
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 -(NSMenu*)menuForEvent:(NSEvent*)theEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
   if (!mGeckoChild || [self isPluginView])
     return nil;
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   [self maybeRollup:theEvent];
   if (!mGeckoChild)
     return nil;
   // Cocoa doesn't always dispatch a mouseDown: for a control-click event,
   // depends on what we return from menuForEvent:. Gecko always expects one
   // and expects the mouse down event before the context menu event, so
   // get that event sent first if this is a left mouse click.
   if ([theEvent type] == NSLeftMouseDown) {
     [self mouseDown:theEvent];
     if (!mGeckoChild)
       return nil;
   }
   WidgetMouseEvent geckoEvent(true, NS_CONTEXTMENU, mGeckoChild,
                               WidgetMouseEvent::eReal);
   [self convertCocoaMouseEvent:theEvent toGeckoEvent:&geckoEvent];
   geckoEvent.button = WidgetMouseEvent::eRightButton;
   mGeckoChild->DispatchWindowEvent(geckoEvent);
   if (!mGeckoChild)
     return nil;
   [self maybeInitContextMenuTracking];
   // Go up our view chain to fetch the correct menu to return.
   return [self contextMenu];
   NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
 }
 - (NSMenu*)contextMenu
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
   NSView* superView = [self superview];
   if ([superView respondsToSelector:@selector(contextMenu)])
     return [(NSView<mozView>*)superView contextMenu];
   return nil;
   NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
 }
 - (void) convertCocoaMouseWheelEvent:(NSEvent*)aMouseEvent
                         toGeckoEvent:(WidgetWheelEvent*)outWheelEvent
 {
   [self convertCocoaMouseEvent:aMouseEvent toGeckoEvent:outWheelEvent];
   outWheelEvent->deltaMode =
     Preferences::GetBool("mousewheel.enable_pixel_scrolling", true) ?
       nsIDOMWheelEvent::DOM_DELTA_PIXEL : nsIDOMWheelEvent::DOM_DELTA_LINE;
   // Calling deviceDeltaX or deviceDeltaY on theEvent will trigger a Cocoa
   // assertion and an Objective-C NSInternalInconsistencyException if the
   // underlying "Carbon" event doesn't contain pixel scrolling information.
   // For these events, carbonEventKind is kEventMouseWheelMoved instead of
   // kEventMouseScroll.
   if (outWheelEvent->deltaMode == nsIDOMWheelEvent::DOM_DELTA_PIXEL) {
     EventRef theCarbonEvent = [aMouseEvent _eventRef];
     UInt32 carbonEventKind = theCarbonEvent ? ::GetEventKind(theCarbonEvent) : 0;
     if (carbonEventKind != kEventMouseScroll) {
       outWheelEvent->deltaMode = nsIDOMWheelEvent::DOM_DELTA_LINE;
     }
   }
   outWheelEvent->isMomentum = nsCocoaUtils::IsMomentumScrollEvent(aMouseEvent);
 }
 - (void) convertCocoaMouseEvent:(NSEvent*)aMouseEvent
                    toGeckoEvent:(WidgetInputEvent*)outGeckoEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   NS_ASSERTION(outGeckoEvent, "convertCocoaMouseEvent:toGeckoEvent: requires non-null aoutGeckoEvent");
   if (!outGeckoEvent)
     return;
   nsCocoaUtils::InitInputEvent(*outGeckoEvent, aMouseEvent);
   // convert point to view coordinate system
   NSPoint locationInWindow = nsCocoaUtils::EventLocationForWindow(aMouseEvent, [self window]);
   NSPoint localPoint = [self convertPoint:locationInWindow fromView:nil];
   outGeckoEvent->refPoint = LayoutDeviceIntPoint::FromUntyped(
     mGeckoChild->CocoaPointsToDevPixels(localPoint));
   WidgetMouseEventBase* mouseEvent = outGeckoEvent->AsMouseEventBase();
   mouseEvent->buttons = 0;
   NSUInteger mouseButtons = [NSEvent pressedMouseButtons];
   if (mouseButtons & 0x01) {
     mouseEvent->buttons |= WidgetMouseEvent::eLeftButtonFlag;
   }
   if (mouseButtons & 0x02) {
     mouseEvent->buttons |= WidgetMouseEvent::eRightButtonFlag;
   }
   if (mouseButtons & 0x04) {
     mouseEvent->buttons |= WidgetMouseEvent::eMiddleButtonFlag;
   }
   if (mouseButtons & 0x08) {
     mouseEvent->buttons |= WidgetMouseEvent::e4thButtonFlag;
   }
   if (mouseButtons & 0x10) {
     mouseEvent->buttons |= WidgetMouseEvent::e5thButtonFlag;
   }
   switch ([aMouseEvent type]) {
     case NSLeftMouseDown:
     case NSLeftMouseUp:
     case NSLeftMouseDragged:
     case NSRightMouseDown:
     case NSRightMouseUp:
     case NSRightMouseDragged:
     case NSOtherMouseDown:
     case NSOtherMouseUp:
     case NSOtherMouseDragged:
       if ([aMouseEvent subtype] == NSTabletPointEventSubtype) {
         mouseEvent->pressure = [aMouseEvent pressure];
       }
       break;
   }
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 #pragma mark -
 // NSTextInput implementation
 - (void)insertText:(id)insertString
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   NS_ENSURE_TRUE_VOID(mGeckoChild);
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   NSAttributedString* attrStr;
   if ([insertString isKindOfClass:[NSAttributedString class]]) {
     attrStr = static_cast<NSAttributedString*>(insertString);
   } else {
     attrStr =
       [[[NSAttributedString alloc] initWithString:insertString] autorelease];
   }
   mTextInputHandler->InsertText(attrStr);
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)insertNewline:(id)sender
 {
   [self insertText:@"\n"];
 }
 - (void) doCommandBySelector:(SEL)aSelector
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (!mGeckoChild || !mTextInputHandler) {
     return;
   }
   const char* sel = reinterpret_cast<const char*>(aSelector);
   if (!mTextInputHandler->DoCommandBySelector(sel)) {
     [super doCommandBySelector:aSelector];
   }
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void) setMarkedText:(id)aString selectedRange:(NSRange)selRange
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   NS_ENSURE_TRUE_VOID(mTextInputHandler);
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   NSAttributedString* attrStr;
   if ([aString isKindOfClass:[NSAttributedString class]]) {
     attrStr = static_cast<NSAttributedString*>(aString);
   } else {
     attrStr = [[[NSAttributedString alloc] initWithString:aString] autorelease];
   }
   mTextInputHandler->SetMarkedText(attrStr, selRange);
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void) unmarkText
 {
   NS_ENSURE_TRUE(mTextInputHandler, );
   mTextInputHandler->CommitIMEComposition();
 }
 - (BOOL) hasMarkedText
 {
   NS_ENSURE_TRUE(mTextInputHandler, NO);
   return mTextInputHandler->HasMarkedText();
 }
 - (BOOL)shouldMinimizeOnTitlebarDoubleClick
 {
   NSString *MDAppleMiniaturizeOnDoubleClickKey =
                                       @"AppleMiniaturizeOnDoubleClick";
   NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
   bool shouldMinimize = [[userDefaults
           objectForKey:MDAppleMiniaturizeOnDoubleClickKey] boolValue];
   return shouldMinimize;
 }
 - (NSInteger) conversationIdentifier
 {
   NS_ENSURE_TRUE(mTextInputHandler, reinterpret_cast<NSInteger>(self));
   return mTextInputHandler->ConversationIdentifier();
 }
 - (NSAttributedString *) attributedSubstringFromRange:(NSRange)theRange
 {
   NS_ENSURE_TRUE(mTextInputHandler, nil);
   return mTextInputHandler->GetAttributedSubstringFromRange(theRange);
 }
 - (NSRange) markedRange
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
   NS_ENSURE_TRUE(mTextInputHandler, NSMakeRange(NSNotFound, 0));
   return mTextInputHandler->MarkedRange();
   NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(NSMakeRange(0, 0));
 }
 - (NSRange) selectedRange
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
   NS_ENSURE_TRUE(mTextInputHandler, NSMakeRange(NSNotFound, 0));
   return mTextInputHandler->SelectedRange();
   NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(NSMakeRange(0, 0));
 }
 - (NSRect) firstRectForCharacterRange:(NSRange)theRange
 {
   NSRect rect;
   NS_ENSURE_TRUE(mTextInputHandler, rect);
   return mTextInputHandler->FirstRectForCharacterRange(theRange);
 }
 - (NSUInteger)characterIndexForPoint:(NSPoint)thePoint
 {
   NS_ENSURE_TRUE(mTextInputHandler, 0);
   return mTextInputHandler->CharacterIndexForPoint(thePoint);
 }
 - (NSArray*) validAttributesForMarkedText
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
   NS_ENSURE_TRUE(mTextInputHandler, [NSArray array]);
   return mTextInputHandler->GetValidAttributesForMarkedText();
   NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
 }
 #pragma mark -
 // NSTextInputClient implementation
 - (void)insertText:(id)aString replacementRange:(NSRange)replacementRange
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   NS_ENSURE_TRUE_VOID(mGeckoChild);
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   NSAttributedString* attrStr;
   if ([aString isKindOfClass:[NSAttributedString class]]) {
     attrStr = static_cast<NSAttributedString*>(aString);
   } else {
     attrStr = [[[NSAttributedString alloc] initWithString:aString] autorelease];
   }
   mTextInputHandler->InsertText(attrStr, &replacementRange);
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)setMarkedText:(id)aString selectedRange:(NSRange)selectedRange
                                replacementRange:(NSRange)replacementRange
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   NS_ENSURE_TRUE_VOID(mTextInputHandler);
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   NSAttributedString* attrStr;
   if ([aString isKindOfClass:[NSAttributedString class]]) {
     attrStr = static_cast<NSAttributedString*>(aString);
   } else {
     attrStr = [[[NSAttributedString alloc] initWithString:aString] autorelease];
   }
   mTextInputHandler->SetMarkedText(attrStr, selectedRange, &replacementRange);
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (NSAttributedString*)attributedSubstringForProposedRange:(NSRange)aRange
                                         actualRange:(NSRangePointer)actualRange
 {
   NS_ENSURE_TRUE(mTextInputHandler, nil);
   return mTextInputHandler->GetAttributedSubstringFromRange(aRange,
                                                             actualRange);
 }
 - (NSRect)firstRectForCharacterRange:(NSRange)aRange
                          actualRange:(NSRangePointer)actualRange
 {
   NS_ENSURE_TRUE(mTextInputHandler, NSMakeRect(0.0, 0.0, 0.0, 0.0));
   return mTextInputHandler->FirstRectForCharacterRange(aRange, actualRange);
 }
 - (NSInteger)windowLevel
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
   NS_ENSURE_TRUE(mTextInputHandler, [[self window] level]);
   return mTextInputHandler->GetWindowLevel();
   NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(NSNormalWindowLevel);
 }
 #pragma mark -
 #ifdef __LP64__
 - (NSTextInputContext *)inputContext
 {
   if (mIsPluginView && mPluginEventModel == NPEventModelCocoa)
     return [[ComplexTextInputPanel sharedComplexTextInputPanel] inputContext];
   else
     return [super inputContext];
 }
 #endif
 // This is a private API that Cocoa uses.
 // Cocoa will call this after the menu system returns "NO" for "performKeyEquivalent:".
 // We want all they key events we can get so just return YES. In particular, this fixes
 // ctrl-tab - we don't get a "keyDown:" call for that without this.
 - (BOOL)_wantsKeyDownForEvent:(NSEvent*)event
 {
   return YES;
 }
 - (void)keyDown:(NSEvent*)theEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
 #if !defined(RELEASE_BUILD) || defined(DEBUG)
   if (mGeckoChild && mTextInputHandler && mTextInputHandler->IsFocused()) {
 #ifdef MOZ_CRASHREPORTER
     NSWindow* window = [self window];
     NSString* info = [NSString stringWithFormat:@"\nview [%@], window [%@], key event [%@], window is key %i, is fullscreen %i, app is active %i",
                       self, window, theEvent, [window isKeyWindow], ([window styleMask] & (1 << 14)) != 0,
                       [NSApp isActive]];
     nsAutoCString additionalInfo([info UTF8String]);
 #endif
     if (mIsPluginView) {
       if (TextInputHandler::IsSecureEventInputEnabled()) {
         #define CRASH_MESSAGE "While a plugin has focus, we must not be in secure mode"
 #ifdef MOZ_CRASHREPORTER
         CrashReporter::AppendAppNotesToCrashReport(NS_LITERAL_CSTRING("\nBug 893973: ") +
                                                    NS_LITERAL_CSTRING(CRASH_MESSAGE));
         CrashReporter::AppendAppNotesToCrashReport(additionalInfo);
 #endif
         MOZ_CRASH(CRASH_MESSAGE);
         #undef CRASH_MESSAGE
       }
     } else if (mGeckoChild->GetInputContext().IsPasswordEditor() &&
                !TextInputHandler::IsSecureEventInputEnabled()) {
       #define CRASH_MESSAGE "A password editor has focus, but not in secure input mode"
 #ifdef MOZ_CRASHREPORTER
       CrashReporter::AppendAppNotesToCrashReport(NS_LITERAL_CSTRING("\nBug 893973: ") +
                                                  NS_LITERAL_CSTRING(CRASH_MESSAGE));
       CrashReporter::AppendAppNotesToCrashReport(additionalInfo);
 #endif
       MOZ_CRASH(CRASH_MESSAGE);
       #undef CRASH_MESSAGE
     } else if (!mGeckoChild->GetInputContext().IsPasswordEditor() &&
                TextInputHandler::IsSecureEventInputEnabled()) {
       #define CRASH_MESSAGE "A non-password editor has focus, but in secure input mode"
 #ifdef MOZ_CRASHREPORTER
       CrashReporter::AppendAppNotesToCrashReport(NS_LITERAL_CSTRING("\nBug 893973: ") +
                                                  NS_LITERAL_CSTRING(CRASH_MESSAGE));
       CrashReporter::AppendAppNotesToCrashReport(additionalInfo);
 #endif
       MOZ_CRASH(CRASH_MESSAGE);
       #undef CRASH_MESSAGE
     }
   }
 #endif // #if !defined(RELEASE_BUILD) || defined(DEBUG)
   if (mGeckoChild && mTextInputHandler && mIsPluginView) {
     mTextInputHandler->HandleKeyDownEventForPlugin(theEvent);
     return;
   }
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   bool handled = false;
   if (mGeckoChild && mTextInputHandler) {
     handled = mTextInputHandler->HandleKeyDownEvent(theEvent);
   }
   // We always allow keyboard events to propagate to keyDown: but if they are not
   // handled we give special Application menu items a chance to act.
   if (!handled && sApplicationMenu) {
     [sApplicationMenu performKeyEquivalent:theEvent];
   }
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)keyUp:(NSEvent*)theEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   NS_ENSURE_TRUE(mGeckoChild, );
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   if (mIsPluginView) {
     mTextInputHandler->HandleKeyUpEventForPlugin(theEvent);
     return;
   }
   mTextInputHandler->HandleKeyUpEvent(theEvent);
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)flagsChanged:(NSEvent*)theEvent
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   NS_ENSURE_TRUE(mGeckoChild, );
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   mTextInputHandler->HandleFlagsChanged(theEvent);
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (BOOL) isFirstResponder
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
   NSResponder* resp = [[self window] firstResponder];
   return (resp == (NSResponder*)self);
   NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(NO);
 }
 - (BOOL)isDragInProgress
 {
   if (!mDragService)
     return NO;
   nsCOMPtr<nsIDragSession> dragSession;
   mDragService->GetCurrentSession(getter_AddRefs(dragSession));
   return dragSession != nullptr;
 }
 - (BOOL)inactiveWindowAcceptsMouseEvent:(NSEvent*)aEvent
 {
   // If we're being destroyed assume the default -- return YES.
   if (!mGeckoChild)
     return YES;
   WidgetMouseEvent geckoEvent(true, NS_MOUSE_ACTIVATE, mGeckoChild,
                               WidgetMouseEvent::eReal);
   [self convertCocoaMouseEvent:aEvent toGeckoEvent:&geckoEvent];
   return !mGeckoChild->DispatchWindowEvent(geckoEvent);
 }
 // Returns NO if the plugin shouldn't be focused/unfocused.
 - (BOOL)updatePluginFocusStatus:(BOOL)getFocus
 {
   if (!mGeckoChild)
     return NO;
   if (mPluginEventModel == NPEventModelCocoa) {
     WidgetPluginEvent pluginEvent(true, NS_PLUGIN_FOCUS_EVENT, mGeckoChild);
     NPCocoaEvent cocoaEvent;
     nsCocoaUtils::InitNPCocoaEvent(&cocoaEvent);
     cocoaEvent.type = NPCocoaEventFocusChanged;
     cocoaEvent.data.focus.hasFocus = getFocus;
     nsCocoaUtils::InitPluginEvent(pluginEvent, cocoaEvent);
     mGeckoChild->DispatchWindowEvent(pluginEvent);
     if (getFocus)
       [self sendFocusEvent:NS_PLUGIN_FOCUS];
   }
   return YES;
 }
 // We must always call through to our superclass, even when mGeckoChild is
 // nil -- otherwise the keyboard focus can end up in the wrong NSView.
 - (BOOL)becomeFirstResponder
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
   if (mIsPluginView) {
     if (![self updatePluginFocusStatus:YES])
       return NO;
   }
   return [super becomeFirstResponder];
   NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(YES);
 }
 // We must always call through to our superclass, even when mGeckoChild is
 // nil -- otherwise the keyboard focus can end up in the wrong NSView.
 - (BOOL)resignFirstResponder
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
   if (mIsPluginView) {
     if (![self updatePluginFocusStatus:NO])
       return NO;
   }
   return [super resignFirstResponder];
   NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(YES);
 }
 - (void)viewsWindowDidBecomeKey
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   if (!mGeckoChild)
     return;
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   // check to see if the window implements the mozWindow protocol. This
   // allows embedders to avoid re-entrant calls to -makeKeyAndOrderFront,
   // which can happen because these activate calls propagate out
   // to the embedder via nsIEmbeddingSiteWindow::SetFocus().
   BOOL isMozWindow = [[self window] respondsToSelector:@selector(setSuppressMakeKeyFront:)];
   if (isMozWindow)
     [[self window] setSuppressMakeKeyFront:YES];
   nsIWidgetListener* listener = mGeckoChild->GetWidgetListener();
   if (listener)
     listener->WindowActivated();
   if (isMozWindow)
     [[self window] setSuppressMakeKeyFront:NO];
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 - (void)viewsWindowDidResignKey
 {
   if (!mGeckoChild)
     return;
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   nsIWidgetListener* listener = mGeckoChild->GetWidgetListener();
   if (listener)
     listener->WindowDeactivated();
 }
 // If the call to removeFromSuperview isn't delayed from nsChildView::
 // TearDownView(), the NSView hierarchy might get changed during calls to
 // [ChildView drawRect:], which leads to "beyond bounds" exceptions in
 // NSCFArray.  For more info see bmo bug 373122.  Apple's docs claim that
 // removeFromSuperviewWithoutNeedingDisplay "can be safely invoked during
 // display" (whatever "display" means).  But it's _not_ true that it can be
 // safely invoked during calls to [NSView drawRect:].  We use
 // removeFromSuperview here because there's no longer any danger of being
 // "invoked during display", and because doing do clears up bmo bug 384343.
 - (void)delayedTearDown
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   [self removeFromSuperview];
   [self release];
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 #pragma mark -
 // drag'n'drop stuff
 #define kDragServiceContractID "@mozilla.org/widget/dragservice;1"
 - (NSDragOperation)dragOperationForSession:(nsIDragSession*)aDragSession
 {
   uint32_t dragAction;
   aDragSession->GetDragAction(&dragAction);
   if (nsIDragService::DRAGDROP_ACTION_LINK & dragAction)
     return NSDragOperationLink;
   if (nsIDragService::DRAGDROP_ACTION_COPY & dragAction)
     return NSDragOperationCopy;
   if (nsIDragService::DRAGDROP_ACTION_MOVE & dragAction)
     return NSDragOperationGeneric;
   return NSDragOperationNone;
 }
 // This is a utility function used by NSView drag event methods
 // to send events. It contains all of the logic needed for Gecko
 // dragging to work. Returns the appropriate cocoa drag operation code.
 - (NSDragOperation)doDragAction:(uint32_t)aMessage sender:(id)aSender
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
   if (!mGeckoChild)
     return NSDragOperationNone;
   PR_LOG(sCocoaLog, PR_LOG_ALWAYS, ("ChildView doDragAction: entered\n"));
   if (!mDragService) {
     CallGetService(kDragServiceContractID, &mDragService);
     NS_ASSERTION(mDragService, "Couldn't get a drag service - big problem!");
     if (!mDragService)
       return NSDragOperationNone;
   }
   if (aMessage == NS_DRAGDROP_ENTER)
     mDragService->StartDragSession();
   nsCOMPtr<nsIDragSession> dragSession;
   mDragService->GetCurrentSession(getter_AddRefs(dragSession));
   if (dragSession) {
     if (aMessage == NS_DRAGDROP_OVER) {
       // fire the drag event at the source. Just ignore whether it was
       // cancelled or not as there isn't actually a means to stop the drag
       mDragService->FireDragEventAtSource(NS_DRAGDROP_DRAG);
       dragSession->SetCanDrop(false);
     }
     else if (aMessage == NS_DRAGDROP_DROP) {
       // We make the assumption that the dragOver handlers have correctly set
       // the |canDrop| property of the Drag Session.
       bool canDrop = false;
       if (!NS_SUCCEEDED(dragSession->GetCanDrop(&canDrop)) || !canDrop) {
         [self doDragAction:NS_DRAGDROP_EXIT sender:aSender];
         nsCOMPtr<nsIDOMNode> sourceNode;
         dragSession->GetSourceNode(getter_AddRefs(sourceNode));
         if (!sourceNode) {
           mDragService->EndDragSession(false);
         }
         return NSDragOperationNone;
       }
     }
     unsigned int modifierFlags = [[NSApp currentEvent] modifierFlags];
     uint32_t action = nsIDragService::DRAGDROP_ACTION_MOVE;
     // force copy = option, alias = cmd-option, default is move
     if (modifierFlags & NSAlternateKeyMask) {
       if (modifierFlags & NSCommandKeyMask)
         action = nsIDragService::DRAGDROP_ACTION_LINK;
       else
         action = nsIDragService::DRAGDROP_ACTION_COPY;
     }
     dragSession->SetDragAction(action);
   }
   // set up gecko event
   WidgetDragEvent geckoEvent(true, aMessage, mGeckoChild);
   nsCocoaUtils::InitInputEvent(geckoEvent, [NSApp currentEvent]);
   // Use our own coordinates in the gecko event.
   // Convert event from gecko global coords to gecko view coords.
   NSPoint draggingLoc = [aSender draggingLocation];
   NSPoint localPoint = [self convertPoint:draggingLoc fromView:nil];
   geckoEvent.refPoint = LayoutDeviceIntPoint::FromUntyped(
     mGeckoChild->CocoaPointsToDevPixels(localPoint));
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   mGeckoChild->DispatchWindowEvent(geckoEvent);
   if (!mGeckoChild)
     return NSDragOperationNone;
   if (dragSession) {
     switch (aMessage) {
       case NS_DRAGDROP_ENTER:
       case NS_DRAGDROP_OVER:
         return [self dragOperationForSession:dragSession];
       case NS_DRAGDROP_EXIT:
       case NS_DRAGDROP_DROP: {
         nsCOMPtr<nsIDOMNode> sourceNode;
         dragSession->GetSourceNode(getter_AddRefs(sourceNode));
         if (!sourceNode) {
           // We're leaving a window while doing a drag that was
           // initiated in a different app. End the drag session,
           // since we're done with it for now (until the user
           // drags back into mozilla).
           mDragService->EndDragSession(false);
         }
       }
     }
   }
   return NSDragOperationGeneric;
   NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(NSDragOperationNone);
 }
 - (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
   PR_LOG(sCocoaLog, PR_LOG_ALWAYS, ("ChildView draggingEntered: entered\n"));
   // there should never be a globalDragPboard when "draggingEntered:" is
   // called, but just in case we'll take care of it here.
   [globalDragPboard release];
   // Set the global drag pasteboard that will be used for this drag session.
   // This will be set back to nil when the drag session ends (mouse exits
   // the view or a drop happens within the view).
   globalDragPboard = [[sender draggingPasteboard] retain];
   return [self doDragAction:NS_DRAGDROP_ENTER sender:sender];
   NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(NSDragOperationNone);
 }
 - (NSDragOperation)draggingUpdated:(id <NSDraggingInfo>)sender
 {
   PR_LOG(sCocoaLog, PR_LOG_ALWAYS, ("ChildView draggingUpdated: entered\n"));
   return [self doDragAction:NS_DRAGDROP_OVER sender:sender];
 }
 - (void)draggingExited:(id <NSDraggingInfo>)sender
 {
   PR_LOG(sCocoaLog, PR_LOG_ALWAYS, ("ChildView draggingExited: entered\n"));
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   [self doDragAction:NS_DRAGDROP_EXIT sender:sender];
   NS_IF_RELEASE(mDragService);
 }
 - (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
 {
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   BOOL handled = [self doDragAction:NS_DRAGDROP_DROP sender:sender] != NSDragOperationNone;
   NS_IF_RELEASE(mDragService);
   return handled;
 }
 // NSDraggingSource
 - (void)draggedImage:(NSImage *)anImage movedTo:(NSPoint)aPoint
 {
   // Get the drag service if it isn't already cached. The drag service
   // isn't cached when dragging over a different application.
   nsCOMPtr<nsIDragService> dragService = mDragService;
   if (!dragService) {
     dragService = do_GetService(kDragServiceContractID);
   }
   if (dragService) {
     NSPoint pnt = [NSEvent mouseLocation];
     FlipCocoaScreenCoordinate(pnt);
     dragService->DragMoved(NSToIntRound(pnt.x), NSToIntRound(pnt.y));
   }
 }
 // NSDraggingSource
 - (void)draggedImage:(NSImage *)anImage endedAt:(NSPoint)aPoint operation:(NSDragOperation)operation
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
   gDraggedTransferables = nullptr;
   NSEvent *currentEvent = [NSApp currentEvent];
   gUserCancelledDrag = ([currentEvent type] == NSKeyDown &&
                         [currentEvent keyCode] == kVK_Escape);
   if (!mDragService) {
     CallGetService(kDragServiceContractID, &mDragService);
     NS_ASSERTION(mDragService, "Couldn't get a drag service - big problem!");
   }
   if (mDragService) {
     // set the dragend point from the current mouse location
     nsDragService* dragService = static_cast<nsDragService *>(mDragService);
     NSPoint pnt = [NSEvent mouseLocation];
     FlipCocoaScreenCoordinate(pnt);
     dragService->SetDragEndPoint(nsIntPoint(NSToIntRound(pnt.x), NSToIntRound(pnt.y)));
     // XXX: dropEffect should be updated per |operation|.
     // As things stand though, |operation| isn't well handled within "our"
     // events, that is, when the drop happens within the window: it is set
     // either to NSDragOperationGeneric or to NSDragOperationNone.
     // For that reason, it's not yet possible to override dropEffect per the
     // given OS value, and it's also unclear what's the correct dropEffect
     // value for NSDragOperationGeneric that is passed by other applications.
     // All that said, NSDragOperationNone is still reliable.
     if (operation == NSDragOperationNone) {
       nsCOMPtr<nsIDOMDataTransfer> dataTransfer;
       dragService->GetDataTransfer(getter_AddRefs(dataTransfer));
       if (dataTransfer)
         dataTransfer->SetDropEffectInt(nsIDragService::DRAGDROP_ACTION_NONE);
     }
     mDragService->EndDragSession(true);
     NS_RELEASE(mDragService);
   }
   [globalDragPboard release];
   globalDragPboard = nil;
   [gLastDragMouseDownEvent release];
   gLastDragMouseDownEvent = nil;
   NS_OBJC_END_TRY_ABORT_BLOCK;
 }
 // NSDraggingSource
 // this is just implemented so we comply with the NSDraggingSource informal protocol
 - (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal
 {
   return UINT_MAX;
 }
 // This method is a callback typically invoked in response to a drag ending on the desktop
 // or a Findow folder window; the argument passed is a path to the drop location, to be used
 // in constructing a complete pathname for the file(s) we want to create as a result of
 // the drag.
 - (NSArray *)namesOfPromisedFilesDroppedAtDestination:(NSURL*)dropDestination
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
   nsresult rv;
   PR_LOG(sCocoaLog, PR_LOG_ALWAYS, ("ChildView namesOfPromisedFilesDroppedAtDestination: entering callback for promised files\n"));
   nsCOMPtr<nsIFile> targFile;
   NS_NewLocalFile(EmptyString(), true, getter_AddRefs(targFile));
   nsCOMPtr<nsILocalFileMac> macLocalFile = do_QueryInterface(targFile);
   if (!macLocalFile) {
     NS_ERROR("No Mac local file");
     return nil;
   }
   if (!NS_SUCCEEDED(macLocalFile->InitWithCFURL((CFURLRef)dropDestination))) {
     NS_ERROR("failed InitWithCFURL");
     return nil;
   }
   if (!gDraggedTransferables)
     return nil;
   uint32_t transferableCount;
   rv = gDraggedTransferables->Count(&transferableCount);
   if (NS_FAILED(rv))
     return nil;
   for (uint32_t i = 0; i < transferableCount; i++) {
     nsCOMPtr<nsISupports> genericItem;
     gDraggedTransferables->GetElementAt(i, getter_AddRefs(genericItem));
     nsCOMPtr<nsITransferable> item(do_QueryInterface(genericItem));
     if (!item) {
       NS_ERROR("no transferable");
       return nil;
     }
     item->SetTransferData(kFilePromiseDirectoryMime, macLocalFile, sizeof(nsIFile*));
     // now request the kFilePromiseMime data, which will invoke the data provider
     // If successful, the returned data is a reference to the resulting file.
     nsCOMPtr<nsISupports> fileDataPrimitive;
     uint32_t dataSize = 0;
     item->GetTransferData(kFilePromiseMime, getter_AddRefs(fileDataPrimitive), &dataSize);
   }
   NSPasteboard* generalPboard = [NSPasteboard pasteboardWithName:NSDragPboard];
   NSData* data = [generalPboard dataForType:@"application/x-moz-file-promise-dest-filename"];
   NSString* name = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
   NSArray* rslt = [NSArray arrayWithObject:name];
   [name release];
   return rslt;
   NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
 }
 #pragma mark -
 // Support for the "Services" menu. We currently only support sending strings
 // and HTML to system services.
 - (id)validRequestorForSendType:(NSString *)sendType
                      returnType:(NSString *)returnType
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
   // sendType contains the type of data that the service would like this
   // application to send to it.  sendType is nil if the service is not
   // requesting any data.
   //
   // returnType contains the type of data the the service would like to
   // return to this application (e.g., to overwrite the selection).
   // returnType is nil if the service will not return any data.
   //
   // The following condition thus triggers when the service expects a string
   // or HTML from us or no data at all AND when the service will either not
   // send back any data to us or will send a string or HTML back to us.
 #define IsSupportedType(typeStr) ([typeStr isEqual:NSStringPboardType] || [typeStr isEqual:NSHTMLPboardType])
   id result = nil;
   if ((!sendType || IsSupportedType(sendType)) &&
       (!returnType || IsSupportedType(returnType))) {
     if (mGeckoChild) {
       // Assume that this object will be able to handle this request.
       result = self;
       // Keep the ChildView alive during this operation.
       nsAutoRetainCocoaObject kungFuDeathGrip(self);
       // Determine if there is a selection (if sending to the service).
       if (sendType) {
         WidgetQueryContentEvent event(true, NS_QUERY_CONTENT_STATE,
                                       mGeckoChild);
         // This might destroy our widget (and null out mGeckoChild).
         mGeckoChild->DispatchWindowEvent(event);
         if (!mGeckoChild || !event.mSucceeded || !event.mReply.mHasSelection)
           result = nil;
       }
       // Determine if we can paste (if receiving data from the service).
       if (mGeckoChild && returnType) {
         WidgetContentCommandEvent command(true,
                                           NS_CONTENT_COMMAND_PASTE_TRANSFERABLE,
                                           mGeckoChild, true);
         // This might possibly destroy our widget (and null out mGeckoChild).
         mGeckoChild->DispatchWindowEvent(command);
         if (!mGeckoChild || !command.mSucceeded || !command.mIsEnabled)
           result = nil;
       }
     }
   }
 #undef IsSupportedType
   // Give the superclass a chance if this object will not handle this request.
   if (!result)
     result = [super validRequestorForSendType:sendType returnType:returnType];
   return result;
   NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
 }
 - (BOOL)writeSelectionToPasteboard:(NSPasteboard *)pboard
                              types:(NSArray *)types
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   // Make sure that the service will accept strings or HTML.
   if ([types containsObject:NSStringPboardType] == NO &&
       [types containsObject:NSHTMLPboardType] == NO)
     return NO;
   // Bail out if there is no Gecko object.
   if (!mGeckoChild)
     return NO;
   // Obtain the current selection.
   WidgetQueryContentEvent event(true,
                                 NS_QUERY_SELECTION_AS_TRANSFERABLE,
                                 mGeckoChild);
   mGeckoChild->DispatchWindowEvent(event);
   if (!event.mSucceeded || !event.mReply.mTransferable)
     return NO;
   // Transform the transferable to an NSDictionary.
   NSDictionary* pasteboardOutputDict = nsClipboard::PasteboardDictFromTransferable(event.mReply.mTransferable);
   if (!pasteboardOutputDict)
     return NO;
   // Declare the pasteboard types.
   unsigned int typeCount = [pasteboardOutputDict count];
   NSMutableArray * types = [NSMutableArray arrayWithCapacity:typeCount];
   [types addObjectsFromArray:[pasteboardOutputDict allKeys]];
   [pboard declareTypes:types owner:nil];
   // Write the data to the pasteboard.
   for (unsigned int i = 0; i < typeCount; i++) {
     NSString* currentKey = [types objectAtIndex:i];
     id currentValue = [pasteboardOutputDict valueForKey:currentKey];
     if (currentKey == NSStringPboardType ||
         currentKey == kCorePboardType_url ||
         currentKey == kCorePboardType_urld ||
         currentKey == kCorePboardType_urln) {
       [pboard setString:currentValue forType:currentKey];
     } else if (currentKey == NSHTMLPboardType) {
       [pboard setString:(nsClipboard::WrapHtmlForSystemPasteboard(currentValue)) forType:currentKey];
     } else if (currentKey == NSTIFFPboardType) {
       [pboard setData:currentValue forType:currentKey];
     } else if (currentKey == NSFilesPromisePboardType) {
       [pboard setPropertyList:currentValue forType:currentKey];
     }
   }
   return YES;
   NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(NO);
 }
 // Called if the service wants us to replace the current selection.
 - (BOOL)readSelectionFromPasteboard:(NSPasteboard *)pboard
 {
   nsresult rv;
   nsCOMPtr<nsITransferable> trans = do_CreateInstance("@mozilla.org/widget/transferable;1", &rv);
   if (NS_FAILED(rv))
     return NO;
   trans->Init(nullptr);
   trans->AddDataFlavor(kUnicodeMime);
   trans->AddDataFlavor(kHTMLMime);
   rv = nsClipboard::TransferableFromPasteboard(trans, pboard);
   if (NS_FAILED(rv))
     return NO;
   NS_ENSURE_TRUE(mGeckoChild, false);
   WidgetContentCommandEvent command(true,
                                     NS_CONTENT_COMMAND_PASTE_TRANSFERABLE,
                                     mGeckoChild);
   command.mTransferable = trans;
   mGeckoChild->DispatchWindowEvent(command);
   return command.mSucceeded && command.mIsEnabled;
 }
 #pragma mark -
 #ifdef ACCESSIBILITY
 /* Every ChildView has a corresponding mozDocAccessible object that is doing all
    the heavy lifting. The topmost ChildView corresponds to a mozRootAccessible
    object.
    All ChildView needs to do is to route all accessibility calls (from the NSAccessibility APIs)
    down to its object, pretending that they are the same.
 */
 - (id<mozAccessible>)accessible
 {
   if (!mGeckoChild)
     return nil;
   id<mozAccessible> nativeAccessible = nil;
   nsAutoRetainCocoaObject kungFuDeathGrip(self);
   nsCOMPtr<nsIWidget> kungFuDeathGrip2(mGeckoChild);
   nsRefPtr<a11y::Accessible> accessible = mGeckoChild->GetDocumentAccessible();
   if (!accessible)
     return nil;
   accessible->GetNativeInterface((void**)&nativeAccessible);
 #ifdef DEBUG_hakan
   NSAssert(![nativeAccessible isExpired], @"native acc is expired!!!");
 #endif
   return nativeAccessible;
 }
 /* Implementation of formal mozAccessible formal protocol (enabling mozViews
    to talk to mozAccessible objects in the accessibility module). */
 - (BOOL)hasRepresentedView
 {
   return YES;
 }
 - (id)representedView
 {
   return self;
 }
 - (BOOL)isRoot
 {
   return [[self accessible] isRoot];
 }
 #ifdef DEBUG
 - (void)printHierarchy
 {
   [[self accessible] printHierarchy];
 }
 #endif
 #pragma mark -
 // general
 - (BOOL)accessibilityIsIgnored
 {
   if (!mozilla::a11y::ShouldA11yBeEnabled())
     return [super accessibilityIsIgnored];
   return [[self accessible] accessibilityIsIgnored];
 }
 - (id)accessibilityHitTest:(NSPoint)point
 {
   if (!mozilla::a11y::ShouldA11yBeEnabled())
     return [super accessibilityHitTest:point];
   return [[self accessible] accessibilityHitTest:point];
 }
 - (id)accessibilityFocusedUIElement
 {
   if (!mozilla::a11y::ShouldA11yBeEnabled())
     return [super accessibilityFocusedUIElement];
   return [[self accessible] accessibilityFocusedUIElement];
 }
 // actions
 - (NSArray*)accessibilityActionNames
 {
   if (!mozilla::a11y::ShouldA11yBeEnabled())
     return [super accessibilityActionNames];
   return [[self accessible] accessibilityActionNames];
 }
 - (NSString*)accessibilityActionDescription:(NSString*)action
 {
   if (!mozilla::a11y::ShouldA11yBeEnabled())
     return [super accessibilityActionDescription:action];
   return [[self accessible] accessibilityActionDescription:action];
 }
 - (void)accessibilityPerformAction:(NSString*)action
 {
   if (!mozilla::a11y::ShouldA11yBeEnabled())
     return [super accessibilityPerformAction:action];
   return [[self accessible] accessibilityPerformAction:action];
 }
 // attributes
 - (NSArray*)accessibilityAttributeNames
 {
   if (!mozilla::a11y::ShouldA11yBeEnabled())
     return [super accessibilityAttributeNames];
   return [[self accessible] accessibilityAttributeNames];
 }
 - (BOOL)accessibilityIsAttributeSettable:(NSString*)attribute
 {
   if (!mozilla::a11y::ShouldA11yBeEnabled())
     return [super accessibilityIsAttributeSettable:attribute];
   return [[self accessible] accessibilityIsAttributeSettable:attribute];
 }
 - (id)accessibilityAttributeValue:(NSString*)attribute
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
   if (!mozilla::a11y::ShouldA11yBeEnabled())
     return [super accessibilityAttributeValue:attribute];
   id<mozAccessible> accessible = [self accessible];
   // if we're the root (topmost) accessible, we need to return our native AXParent as we
   // traverse outside to the hierarchy of whoever embeds us. thus, fall back on NSView's
   // default implementation for this attribute.
   if ([attribute isEqualToString:NSAccessibilityParentAttribute] && [accessible isRoot]) {
     id parentAccessible = [super accessibilityAttributeValue:attribute];
     return parentAccessible;
   }
   return [accessible accessibilityAttributeValue:attribute];
   NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
 }
 #endif /* ACCESSIBILITY */
 @end
 #pragma mark -
 void
 ChildViewMouseTracker::OnDestroyView(ChildView* aView)
 {
   if (sLastMouseEventView == aView) {
     sLastMouseEventView = nil;
     [sLastMouseMoveEvent release];
     sLastMouseMoveEvent = nil;
   }
 }
 void
 ChildViewMouseTracker::OnDestroyWindow(NSWindow* aWindow)
 {
   if (sWindowUnderMouse == aWindow) {
     sWindowUnderMouse = nil;
   }
 }
 void
 ChildViewMouseTracker::MouseEnteredWindow(NSEvent* aEvent)
 {
   sWindowUnderMouse = [aEvent window];
   ReEvaluateMouseEnterState(aEvent);
 }
 void
 ChildViewMouseTracker::MouseExitedWindow(NSEvent* aEvent)
 {
   if (sWindowUnderMouse == [aEvent window]) {
     sWindowUnderMouse = nil;
     ReEvaluateMouseEnterState(aEvent);
   }
 }
 void
 ChildViewMouseTracker::ReEvaluateMouseEnterState(NSEvent* aEvent, ChildView* aOldView)
 {
   ChildView* oldView = aOldView ? aOldView : sLastMouseEventView;
   sLastMouseEventView = ViewForEvent(aEvent);
   if (sLastMouseEventView != oldView) {
     // Send enter and / or exit events.
     WidgetMouseEvent::exitType type =
       [sLastMouseEventView window] == [oldView window] ?
         WidgetMouseEvent::eChild : WidgetMouseEvent::eTopLevel;
     [oldView sendMouseEnterOrExitEvent:aEvent enter:NO type:type];
     // After the cursor exits the window set it to a visible regular arrow cursor.
     if (type == WidgetMouseEvent::eTopLevel) {
       [[nsCursorManager sharedInstance] setCursor:eCursor_standard];
     }
     [sLastMouseEventView sendMouseEnterOrExitEvent:aEvent enter:YES type:type];
   }
 }
 void
 ChildViewMouseTracker::ResendLastMouseMoveEvent()
 {
   if (sLastMouseMoveEvent) {
     MouseMoved(sLastMouseMoveEvent);
   }
 }
 void
 ChildViewMouseTracker::MouseMoved(NSEvent* aEvent)
 {
   MouseEnteredWindow(aEvent);
   [sLastMouseEventView handleMouseMoved:aEvent];
   if (sLastMouseMoveEvent != aEvent) {
     [sLastMouseMoveEvent release];
     sLastMouseMoveEvent = [aEvent retain];
   }
 }
 void
 ChildViewMouseTracker::MouseScrolled(NSEvent* aEvent)
 {
   if (!nsCocoaUtils::IsMomentumScrollEvent(aEvent)) {
     // Store the position so we can pin future momentum scroll events.
     sLastScrollEventScreenLocation = nsCocoaUtils::ScreenLocationForEvent(aEvent);
   }
 }
 ChildView*
 ChildViewMouseTracker::ViewForEvent(NSEvent* aEvent)
 {
   NSWindow* window = sWindowUnderMouse;
   if (!window)
     return nil;
   NSPoint windowEventLocation = nsCocoaUtils::EventLocationForWindow(aEvent, window);
   NSView* view = [[[window contentView] superview] hitTest:windowEventLocation];
   if (![view isKindOfClass:[ChildView class]])
     return nil;
   ChildView* childView = (ChildView*)view;
   // If childView is being destroyed return nil.
   if (![childView widget])
     return nil;
   return WindowAcceptsEvent(window, aEvent, childView) ? childView : nil;
 }
 void
 ChildViewMouseTracker::AttachPluginEvent(WidgetMouseEventBase& aMouseEvent,
                                          ChildView* aView,
                                          NSEvent* aNativeMouseEvent,
                                          int aPluginEventType,
                                          void* aPluginEventHolder)
 {
   if (![aView isPluginView] ||
       [aView pluginEventModel] != NPEventModelCocoa) {
     return;
   }
   NPCocoaEvent* cocoaEvent = (NPCocoaEvent*)aPluginEventHolder;
   nsCocoaUtils::InitNPCocoaEvent(cocoaEvent);
   NSPoint point = [aView convertPoint:[aNativeMouseEvent locationInWindow]
                              fromView:nil];
   NPCocoaEventType type = (NPCocoaEventType)aPluginEventType;
   // XXX We should consider dropping this code, which causes data.mouse.pluginX
   // and data.mouse.pluginY to be set to '5' for mouse-entered and mouse-exited
   // events.  But note that it's been in the tree since the Cocoa NPAPI event
   // model was first implemented four years ago, without any known complaints.
   //
   // Similar code first appeared (without explanation) in a very early version
   // ("fix 0.3") of the patch for bug 435041 ("Implement Cocoa NPAPI event
   // model for Mac OS X").  But there's no trace of it in the WebKit code that
   // was used as a model for much of that patch.
 #if (0)
   if (type == NPCocoaEventMouseEntered ||
       type == NPCocoaEventMouseExited) {
     point.x = point.y = 5;
   }
 #endif
   NSUInteger clickCount = 0;
   if (type != NPCocoaEventMouseEntered &&
       type != NPCocoaEventMouseExited &&
       type != NPCocoaEventScrollWheel) {
     clickCount = [aNativeMouseEvent clickCount];
   }
   cocoaEvent->type = type;
   cocoaEvent->data.mouse.modifierFlags = [aNativeMouseEvent modifierFlags];
   cocoaEvent->data.mouse.pluginX = point.x;
   cocoaEvent->data.mouse.pluginY = point.y;
   cocoaEvent->data.mouse.buttonNumber = [aNativeMouseEvent buttonNumber];
   cocoaEvent->data.mouse.clickCount = clickCount;
   cocoaEvent->data.mouse.deltaX = [aNativeMouseEvent deltaX];
   cocoaEvent->data.mouse.deltaY = [aNativeMouseEvent deltaY];
   cocoaEvent->data.mouse.deltaZ = [aNativeMouseEvent deltaZ];
   aMouseEvent.pluginEvent = cocoaEvent;
 }
 BOOL
 ChildViewMouseTracker::WindowAcceptsEvent(NSWindow* aWindow, NSEvent* aEvent,
                                           ChildView* aView, BOOL aIsClickThrough)
 {
   // Right mouse down events may get through to all windows, even to a top level
   // window with an open sheet.
   if (!aWindow || [aEvent type] == NSRightMouseDown)
     return YES;
   id delegate = [aWindow delegate];
   if (!delegate || ![delegate isKindOfClass:[WindowDelegate class]])
     return YES;
   nsIWidget *windowWidget = [(WindowDelegate *)delegate geckoWidget];
   if (!windowWidget)
     return YES;
   NSWindow* topLevelWindow = nil;
   switch (windowWidget->WindowType()) {
     case eWindowType_popup:
       // If this is a context menu, it won't have a parent. So we'll always
       // accept mouse move events on context menus even when none of our windows
       // is active, which is the right thing to do.
       // For panels, the parent window is the XUL window that owns the panel.
       return WindowAcceptsEvent([aWindow parentWindow], aEvent, aView, aIsClickThrough);
     case eWindowType_toplevel:
     case eWindowType_dialog:
       if ([aWindow attachedSheet])
         return NO;
       topLevelWindow = aWindow;
       break;
     case eWindowType_sheet: {
       nsIWidget* parentWidget = windowWidget->GetSheetWindowParent();
       if (!parentWidget)
         return YES;
       topLevelWindow = (NSWindow*)parentWidget->GetNativeData(NS_NATIVE_WINDOW);
       break;
     }
     default:
       return YES;
   }
   if (!topLevelWindow ||
       ([topLevelWindow isMainWindow] && !aIsClickThrough) ||
       [aEvent type] == NSOtherMouseDown ||
       (([aEvent modifierFlags] & NSCommandKeyMask) != 0 &&
        [aEvent type] != NSMouseMoved))
     return YES;
   // If we're here then we're dealing with a left click or mouse move on an
   // inactive window or something similar. Ask Gecko what to do.
   return [aView inactiveWindowAcceptsMouseEvent:aEvent];
 }
 #pragma mark -
 @interface NSView (MethodSwizzling)
 - (BOOL)nsChildView_NSView_mouseDownCanMoveWindow;
 @end
 @implementation NSView (MethodSwizzling)
 // All top-level browser windows belong to the ToolbarWindow class and have
 // NSTexturedBackgroundWindowMask turned on in their "style" (see particularly
 // [ToolbarWindow initWithContentRect:...] in nsCocoaWindow.mm).  This style
 // normally means the window "may be moved by clicking and dragging anywhere
 // in the window background", but we've suppressed this by giving the
 // ChildView class a mouseDownCanMoveWindow method that always returns NO.
 // Normally a ToolbarWindow's contentView (not a ChildView) returns YES when
 // NSTexturedBackgroundWindowMask is turned on.  But normally this makes no
 // difference.  However, under some (probably very unusual) circumstances
 // (and only on Leopard) it *does* make a difference -- for example it
 // triggers bmo bugs 431902 and 476393.  So here we make sure that a
 // ToolbarWindow's contentView always returns NO from the
 // mouseDownCanMoveWindow method.
 - (BOOL)nsChildView_NSView_mouseDownCanMoveWindow
 {
   NSWindow *ourWindow = [self window];
   NSView *contentView = [ourWindow contentView];
   if ([ourWindow isKindOfClass:[ToolbarWindow class]] && (self == contentView))
     return [ourWindow isMovableByWindowBackground];
   return [self nsChildView_NSView_mouseDownCanMoveWindow];
 }
 @end
 #ifdef __LP64__
 // When using blocks, at least on OS X 10.7, the OS sometimes calls
 // +[NSEvent removeMonitor:] more than once on a single event monitor, which
 // causes crashes.  See bug 678607.  We hook these methods to work around
 // the problem.
 @interface NSEvent (MethodSwizzling)
 + (id)nsChildView_NSEvent_addLocalMonitorForEventsMatchingMask:(unsigned long long)mask handler:(id)block;
 + (void)nsChildView_NSEvent_removeMonitor:(id)eventMonitor;
 @end
 // This is a local copy of the AppKit frameworks sEventObservers hashtable.
 // It only stores "local monitors".  We use it to ensure that +[NSEvent
 // removeMonitor:] is never called more than once on the same local monitor.
 static NSHashTable *sLocalEventObservers = nil;
 @implementation NSEvent (MethodSwizzling)
 + (id)nsChildView_NSEvent_addLocalMonitorForEventsMatchingMask:(unsigned long long)mask handler:(id)block
 {
   if (!sLocalEventObservers) {
     sLocalEventObservers = [[NSHashTable hashTableWithOptions:
       NSHashTableStrongMemory | NSHashTableObjectPointerPersonality] retain];
   }
   id retval =
     [self nsChildView_NSEvent_addLocalMonitorForEventsMatchingMask:mask handler:block];
   if (sLocalEventObservers && retval && ![sLocalEventObservers containsObject:retval]) {
     [sLocalEventObservers addObject:retval];
   }
   return retval;
 }
 + (void)nsChildView_NSEvent_removeMonitor:(id)eventMonitor
 {
   if (sLocalEventObservers && [eventMonitor isKindOfClass: ::NSClassFromString(@"_NSLocalEventObserver")]) {
     if (![sLocalEventObservers containsObject:eventMonitor]) {
       return;
     }
     [sLocalEventObservers removeObject:eventMonitor];
   }
   [self nsChildView_NSEvent_removeMonitor:eventMonitor];
 }
 @end
 #endif // #ifdef __LP64__

The Tor Browser / annotate

widget/cocoa/nsChildView.mm@ac0c01689b40 (annotated)

widget/cocoa/nsChildView.mm