The Tor Browser: view/src/nsView.cpp@6474c204b198 (annotated)

view/src/nsView.cpp@6474c204b198 (annotated)

view/src/nsView.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; 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 "nsView.h"
 #include "mozilla/Attributes.h"
 #include "mozilla/BasicEvents.h"
 #include "mozilla/DebugOnly.h"
 #include "mozilla/IntegerPrintfMacros.h"
 #include "mozilla/Likely.h"
 #include "mozilla/Poison.h"
 #include "nsIWidget.h"
 #include "nsViewManager.h"
 #include "nsIFrame.h"
 #include "nsPresArena.h"
 #include "nsXULPopupManager.h"
 #include "nsIWidgetListener.h"
 #include "nsContentUtils.h" // for nsAutoScriptBlocker
 using namespace mozilla;
 nsView::nsView(nsViewManager* aViewManager, nsViewVisibility aVisibility)
 {
   MOZ_COUNT_CTOR(nsView);
   mVis = aVisibility;
   // Views should be transparent by default. Not being transparent is
   // a promise that the view will paint all its pixels opaquely. Views
   // should make this promise explicitly by calling
   // SetViewContentTransparency.
   mVFlags = 0;
   mViewManager = aViewManager;
   mDirtyRegion = nullptr;
   mWidgetIsTopLevel = false;
 }
 void nsView::DropMouseGrabbing()
 {
   nsIPresShell* presShell = mViewManager->GetPresShell();
   if (presShell)
     presShell->ClearMouseCaptureOnView(this);
 }
 nsView::~nsView()
 {
   MOZ_COUNT_DTOR(nsView);
   while (GetFirstChild())
   {
     nsView* child = GetFirstChild();
     if (child->GetViewManager() == mViewManager) {
       child->Destroy();
     } else {
       // just unhook it. Someone else will want to destroy this.
       RemoveChild(child);
     }
   }
   if (mViewManager)
   {
     DropMouseGrabbing();
     nsView *rootView = mViewManager->GetRootView();
     if (rootView)
     {
       // Root views can have parents!
       if (mParent)
       {
         mViewManager->RemoveChild(this);
       }
       if (rootView == this)
       {
         // Inform the view manager that the root view has gone away...
         mViewManager->SetRootView(nullptr);
       }
     }
     else if (mParent)
     {
       mParent->RemoveChild(this);
     }
     mViewManager = nullptr;
   }
   else if (mParent)
   {
     mParent->RemoveChild(this);
   }
   // Destroy and release the widget
   DestroyWidget();
   delete mDirtyRegion;
 }
 class DestroyWidgetRunnable : public nsRunnable {
 public:
   NS_DECL_NSIRUNNABLE
   explicit DestroyWidgetRunnable(nsIWidget* aWidget) : mWidget(aWidget) {}
 private:
   nsCOMPtr<nsIWidget> mWidget;
 };
 NS_IMETHODIMP DestroyWidgetRunnable::Run()
 {
   mWidget->Destroy();
   mWidget = nullptr;
   return NS_OK;
 }
 void nsView::DestroyWidget()
 {
   if (mWindow)
   {
     // If we are not attached to a base window, we're going to tear down our
     // widget here. However, if we're attached to somebody elses widget, we
     // want to leave the widget alone: don't reset the client data or call
     // Destroy. Just clear our event view ptr and free our reference to it.
     if (mWidgetIsTopLevel) {
       mWindow->SetAttachedWidgetListener(nullptr);
     }
     else {
       mWindow->SetWidgetListener(nullptr);
       nsCOMPtr<nsIRunnable> widgetDestroyer =
         new DestroyWidgetRunnable(mWindow);
       NS_DispatchToMainThread(widgetDestroyer);
     }
     NS_RELEASE(mWindow);
   }
 }
 nsView* nsView::GetViewFor(nsIWidget* aWidget)
 {
   NS_PRECONDITION(nullptr != aWidget, "null widget ptr");
   nsIWidgetListener* listener = aWidget->GetWidgetListener();
   if (listener) {
     nsView* view = listener->GetView();
     if (view)
       return view;
   }
   listener = aWidget->GetAttachedWidgetListener();
   return listener ? listener->GetView() : nullptr;
 }
 void nsView::Destroy()
 {
   this->~nsView();
   mozWritePoison(this, sizeof(*this));
   nsView::operator delete(this);
 }
 void nsView::SetPosition(nscoord aX, nscoord aY)
 {
   mDimBounds.x += aX - mPosX;
   mDimBounds.y += aY - mPosY;
   mPosX = aX;
   mPosY = aY;
   NS_ASSERTION(GetParent() || (aX == 0 && aY == 0),
                "Don't try to move the root widget to something non-zero");
   ResetWidgetBounds(true, false);
 }
 void nsView::ResetWidgetBounds(bool aRecurse, bool aForceSync)
 {
   if (mWindow) {
     if (!aForceSync) {
       // Don't change widget geometry synchronously, since that can
       // cause synchronous painting.
       mViewManager->PostPendingUpdate();
     } else {
       DoResetWidgetBounds(false, true);
     }
     return;
   }
   if (aRecurse) {
     // reposition any widgets under this view
     for (nsView* v = GetFirstChild(); v; v = v->GetNextSibling()) {
       v->ResetWidgetBounds(true, aForceSync);
     }
   }
 }
 bool nsView::IsEffectivelyVisible()
 {
   for (nsView* v = this; v; v = v->mParent) {
     if (v->GetVisibility() == nsViewVisibility_kHide)
       return false;
   }
   return true;
 }
 nsIntRect nsView::CalcWidgetBounds(nsWindowType aType)
 {
   int32_t p2a = mViewManager->AppUnitsPerDevPixel();
   nsRect viewBounds(mDimBounds);
   nsView* parent = GetParent();
   nsIWidget* parentWidget = nullptr;
   if (parent) {
     nsPoint offset;
     parentWidget = parent->GetNearestWidget(&offset, p2a);
     // make viewBounds be relative to the parent widget, in appunits
     viewBounds += offset;
     if (parentWidget && aType == eWindowType_popup &&
         IsEffectivelyVisible()) {
       // put offset into screen coordinates. (based on client area origin)
       nsIntPoint screenPoint = parentWidget->WidgetToScreenOffset();
       viewBounds += nsPoint(NSIntPixelsToAppUnits(screenPoint.x, p2a),
                             NSIntPixelsToAppUnits(screenPoint.y, p2a));
     }
   }
   // Compute widget bounds in device pixels
   nsIntRect newBounds = viewBounds.ToNearestPixels(p2a);
 #ifdef XP_MACOSX
   // cocoa rounds widget coordinates to the nearest global "display pixel"
   // integer value. So we avoid fractional display pixel values by rounding
   // to the nearest value that won't yield a fractional display pixel.
   nsIWidget* widget = parentWidget ? parentWidget : mWindow;
   uint32_t round;
   if (aType == eWindowType_popup && widget &&
       ((round = widget->RoundsWidgetCoordinatesTo()) > 1)) {
     nsIntSize pixelRoundedSize = newBounds.Size();
     // round the top left and bottom right to the nearest round pixel
     newBounds.x = NSToIntRoundUp(NSAppUnitsToDoublePixels(viewBounds.x, p2a) / round) * round;
     newBounds.y = NSToIntRoundUp(NSAppUnitsToDoublePixels(viewBounds.y, p2a) / round) * round;
     newBounds.width =
       NSToIntRoundUp(NSAppUnitsToDoublePixels(viewBounds.XMost(), p2a) / round) * round - newBounds.x;
     newBounds.height =
       NSToIntRoundUp(NSAppUnitsToDoublePixels(viewBounds.YMost(), p2a) / round) * round - newBounds.y;
     // but if that makes the widget larger then our frame may not paint the
     // extra pixels, so reduce the size to the nearest round value
     if (newBounds.width > pixelRoundedSize.width) {
       newBounds.width -= round;
     }
     if (newBounds.height > pixelRoundedSize.height) {
       newBounds.height -= round;
     }
   }
 #endif
   // Compute where the top-left of our widget ended up relative to the parent
   // widget, in appunits.
   nsPoint roundedOffset(NSIntPixelsToAppUnits(newBounds.x, p2a),
                         NSIntPixelsToAppUnits(newBounds.y, p2a));
   // mViewToWidgetOffset is added to coordinates relative to the view origin
   // to get coordinates relative to the widget.
   // The view origin, relative to the parent widget, is at
   // (mPosX,mPosY) - mDimBounds.TopLeft() + viewBounds.TopLeft().
   // Our widget, relative to the parent widget, is roundedOffset.
   mViewToWidgetOffset = nsPoint(mPosX, mPosY)
     - mDimBounds.TopLeft() + viewBounds.TopLeft() - roundedOffset;
   return newBounds;
 }
 void nsView::DoResetWidgetBounds(bool aMoveOnly,
                                  bool aInvalidateChangedSize) {
   // The geometry of a root view's widget is controlled externally,
   // NOT by sizing or positioning the view
   if (mViewManager->GetRootView() == this) {
     return;
   }
   NS_PRECONDITION(mWindow, "Why was this called??");
   // Hold this ref to make sure it stays alive.
   nsCOMPtr<nsIWidget> widget = mWindow;
   // Stash a copy of these and use them so we can handle this being deleted (say
   // from sync painting/flushing from Show/Move/Resize on the widget).
   nsIntRect newBounds;
   nsRefPtr<nsDeviceContext> dx = mViewManager->GetDeviceContext();
   nsWindowType type = widget->WindowType();
   nsIntRect curBounds;
   widget->GetClientBounds(curBounds);
   bool invisiblePopup = type == eWindowType_popup &&
                         ((curBounds.IsEmpty() && mDimBounds.IsEmpty()) ||
                          mVis == nsViewVisibility_kHide);
   if (invisiblePopup) {
     // We're going to hit the early exit below, avoid calling CalcWidgetBounds.
   } else {
     newBounds = CalcWidgetBounds(type);
   }
   bool curVisibility = widget->IsVisible();
   bool newVisibility = IsEffectivelyVisible();
   if (curVisibility && !newVisibility) {
     widget->Show(false);
   }
   if (invisiblePopup) {
     // Don't manipulate empty or hidden popup widgets. For example there's no
     // point moving hidden comboboxes around, or doing X server roundtrips
     // to compute their true screen position. This could mean that WidgetToScreen
     // operations on these widgets don't return up-to-date values, but popup
     // positions aren't reliable anyway because of correction to be on or off-screen.
     return;
   }
   bool changedPos = curBounds.TopLeft() != newBounds.TopLeft();
   bool changedSize = curBounds.Size() != newBounds.Size();
   // Child views are never attached to top level widgets, this is safe.
   // Coordinates are converted to display pixels for window Move/Resize APIs,
   // because of the potential for device-pixel coordinate spaces for mixed
   // hidpi/lodpi screens to overlap each other and result in bad placement
   // (bug 814434).
   double invScale;
   // Bug 861270: for correct widget manipulation at arbitrary scale factors,
   // prefer to base scaling on widget->GetDefaultScale(). But only do this if
   // it matches the view manager's device context scale after allowing for the
   // quantization to app units, because of OS X multiscreen issues (where the
   // only two scales are 1.0 or 2.0, and so the quantization doesn't actually
   // cause problems anyhow).
   // In the case of a mismatch, fall back to scaling based on the dev context's
   // unscaledAppUnitsPerDevPixel value. On platforms where the device-pixel
   // scale is uniform across all displays (currently all except OS X), we'll
   // always use the precise value from mWindow->GetDefaultScale here.
   CSSToLayoutDeviceScale scale = widget->GetDefaultScale();
   if (NSToIntRound(60.0 / scale.scale) == dx->UnscaledAppUnitsPerDevPixel()) {
     invScale = 1.0 / scale.scale;
   } else {
     invScale = dx->UnscaledAppUnitsPerDevPixel() / 60.0;
   }
   if (changedPos) {
     if (changedSize && !aMoveOnly) {
       widget->ResizeClient(newBounds.x * invScale,
                            newBounds.y * invScale,
                            newBounds.width * invScale,
                            newBounds.height * invScale,
                            aInvalidateChangedSize);
     } else {
       widget->MoveClient(newBounds.x * invScale,
                          newBounds.y * invScale);
     }
   } else {
     if (changedSize && !aMoveOnly) {
       widget->ResizeClient(newBounds.width * invScale,
                            newBounds.height * invScale,
                            aInvalidateChangedSize);
     } // else do nothing!
   }
   if (!curVisibility && newVisibility) {
     widget->Show(true);
   }
 }
 void nsView::SetDimensions(const nsRect& aRect, bool aPaint, bool aResizeWidget)
 {
   nsRect dims = aRect;
   dims.MoveBy(mPosX, mPosY);
   // Don't use nsRect's operator== here, since it returns true when
   // both rects are empty even if they have different widths and we
   // have cases where that sort of thing matters to us.
   if (mDimBounds.TopLeft() == dims.TopLeft() &&
       mDimBounds.Size() == dims.Size()) {
     return;
   }
   mDimBounds = dims;
   if (aResizeWidget) {
     ResetWidgetBounds(false, false);
   }
 }
 void nsView::NotifyEffectiveVisibilityChanged(bool aEffectivelyVisible)
 {
   if (!aEffectivelyVisible)
   {
     DropMouseGrabbing();
   }
   SetForcedRepaint(true);
   if (nullptr != mWindow)
   {
     ResetWidgetBounds(false, false);
   }
   for (nsView* child = mFirstChild; child; child = child->mNextSibling) {
     if (child->mVis == nsViewVisibility_kHide) {
       // It was effectively hidden and still is
       continue;
     }
     // Our child is visible if we are
     child->NotifyEffectiveVisibilityChanged(aEffectivelyVisible);
   }
 }
 void nsView::SetVisibility(nsViewVisibility aVisibility)
 {
   mVis = aVisibility;
   NotifyEffectiveVisibilityChanged(IsEffectivelyVisible());
 }
 void nsView::SetFloating(bool aFloatingView)
 {
 	if (aFloatingView)
 		mVFlags |= NS_VIEW_FLAG_FLOATING;
 	else
 		mVFlags &= ~NS_VIEW_FLAG_FLOATING;
 }
 void nsView::InvalidateHierarchy(nsViewManager *aViewManagerParent)
 {
   if (mViewManager->GetRootView() == this)
     mViewManager->InvalidateHierarchy();
   for (nsView *child = mFirstChild; child; child = child->GetNextSibling())
     child->InvalidateHierarchy(aViewManagerParent);
 }
 void nsView::InsertChild(nsView *aChild, nsView *aSibling)
 {
   NS_PRECONDITION(nullptr != aChild, "null ptr");
   if (nullptr != aChild)
   {
     if (nullptr != aSibling)
     {
 #ifdef DEBUG
       NS_ASSERTION(aSibling->GetParent() == this, "tried to insert view with invalid sibling");
 #endif
       //insert after sibling
       aChild->SetNextSibling(aSibling->GetNextSibling());
       aSibling->SetNextSibling(aChild);
     }
     else
     {
       aChild->SetNextSibling(mFirstChild);
       mFirstChild = aChild;
     }
     aChild->SetParent(this);
     // If we just inserted a root view, then update the RootViewManager
     // on all view managers in the new subtree.
     nsViewManager *vm = aChild->GetViewManager();
     if (vm->GetRootView() == aChild)
     {
       aChild->InvalidateHierarchy(nullptr); // don't care about releasing grabs
     }
   }
 }
 void nsView::RemoveChild(nsView *child)
 {
   NS_PRECONDITION(nullptr != child, "null ptr");
   if (nullptr != child)
   {
     nsView* prevKid = nullptr;
     nsView* kid = mFirstChild;
     DebugOnly<bool> found = false;
     while (nullptr != kid) {
       if (kid == child) {
         if (nullptr != prevKid) {
           prevKid->SetNextSibling(kid->GetNextSibling());
         } else {
           mFirstChild = kid->GetNextSibling();
         }
         child->SetParent(nullptr);
         found = true;
         break;
       }
       prevKid = kid;
 	    kid = kid->GetNextSibling();
     }
     NS_ASSERTION(found, "tried to remove non child");
     // If we just removed a root view, then update the RootViewManager
     // on all view managers in the removed subtree.
     nsViewManager *vm = child->GetViewManager();
     if (vm->GetRootView() == child)
     {
       child->InvalidateHierarchy(GetViewManager());
     }
   }
 }
 // Native widgets ultimately just can't deal with the awesome power of
 // CSS2 z-index. However, we set the z-index on the widget anyway
 // because in many simple common cases the widgets do end up in the
 // right order. We set each widget's z-index to the z-index of the
 // nearest ancestor that has non-auto z-index.
 static void UpdateNativeWidgetZIndexes(nsView* aView, int32_t aZIndex)
 {
   if (aView->HasWidget()) {
     nsIWidget* widget = aView->GetWidget();
     if (widget->GetZIndex() != aZIndex) {
       widget->SetZIndex(aZIndex);
     }
   } else {
     for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
       if (v->GetZIndexIsAuto()) {
         UpdateNativeWidgetZIndexes(v, aZIndex);
       }
     }
   }
 }
 static int32_t FindNonAutoZIndex(nsView* aView)
 {
   while (aView) {
     if (!aView->GetZIndexIsAuto()) {
       return aView->GetZIndex();
     }
     aView = aView->GetParent();
   }
   return 0;
 }
 struct DefaultWidgetInitData : public nsWidgetInitData {
   DefaultWidgetInitData() : nsWidgetInitData()
   {
     mWindowType = eWindowType_child;
     clipChildren = true;
     clipSiblings = true;
   }
 };
 nsresult nsView::CreateWidget(nsWidgetInitData *aWidgetInitData,
                                bool aEnableDragDrop,
                                bool aResetVisibility)
 {
   AssertNoWindow();
   NS_ABORT_IF_FALSE(!aWidgetInitData ||
                     aWidgetInitData->mWindowType != eWindowType_popup,
                     "Use CreateWidgetForPopup");
   DefaultWidgetInitData defaultInitData;
   bool initDataPassedIn = !!aWidgetInitData;
   aWidgetInitData = aWidgetInitData ? aWidgetInitData : &defaultInitData;
   defaultInitData.mListenForResizes =
     (!initDataPassedIn && GetParent() &&
      GetParent()->GetViewManager() != mViewManager);
   nsIntRect trect = CalcWidgetBounds(aWidgetInitData->mWindowType);
   nsRefPtr<nsDeviceContext> dx = mViewManager->GetDeviceContext();
   nsIWidget* parentWidget =
     GetParent() ? GetParent()->GetNearestWidget(nullptr) : nullptr;
   if (!parentWidget) {
     NS_ERROR("nsView::CreateWidget without suitable parent widget??");
     return NS_ERROR_FAILURE;
   }
   // XXX: using aForceUseIWidgetParent=true to preserve previous
   // semantics.  It's not clear that it's actually needed.
   mWindow = parentWidget->CreateChild(trect, dx, aWidgetInitData,
                                       true).take();
   if (!mWindow) {
     return NS_ERROR_FAILURE;
   }
   InitializeWindow(aEnableDragDrop, aResetVisibility);
   return NS_OK;
 }
 nsresult nsView::CreateWidgetForParent(nsIWidget* aParentWidget,
                                         nsWidgetInitData *aWidgetInitData,
                                         bool aEnableDragDrop,
                                         bool aResetVisibility)
 {
   AssertNoWindow();
   NS_ABORT_IF_FALSE(!aWidgetInitData ||
                     aWidgetInitData->mWindowType != eWindowType_popup,
                     "Use CreateWidgetForPopup");
   NS_ABORT_IF_FALSE(aParentWidget, "Parent widget required");
   DefaultWidgetInitData defaultInitData;
   aWidgetInitData = aWidgetInitData ? aWidgetInitData : &defaultInitData;
   nsIntRect trect = CalcWidgetBounds(aWidgetInitData->mWindowType);
   nsRefPtr<nsDeviceContext> dx = mViewManager->GetDeviceContext();
   mWindow =
     aParentWidget->CreateChild(trect, dx, aWidgetInitData).take();
   if (!mWindow) {
     return NS_ERROR_FAILURE;
   }
   InitializeWindow(aEnableDragDrop, aResetVisibility);
   return NS_OK;
 }
 nsresult nsView::CreateWidgetForPopup(nsWidgetInitData *aWidgetInitData,
                                        nsIWidget* aParentWidget,
                                        bool aEnableDragDrop,
                                        bool aResetVisibility)
 {
   AssertNoWindow();
   NS_ABORT_IF_FALSE(aWidgetInitData, "Widget init data required");
   NS_ABORT_IF_FALSE(aWidgetInitData->mWindowType == eWindowType_popup,
                     "Use one of the other CreateWidget methods");
   nsIntRect trect = CalcWidgetBounds(aWidgetInitData->mWindowType);
   nsRefPtr<nsDeviceContext> dx = mViewManager->GetDeviceContext();
   // XXX/cjones: having these two separate creation cases seems ... um
   // ... unnecessary, but it's the way the old code did it.  Please
   // unify them by first finding a suitable parent nsIWidget, then
   // getting rid of aForceUseIWidgetParent.
   if (aParentWidget) {
     // XXX: using aForceUseIWidgetParent=true to preserve previous
     // semantics.  It's not clear that it's actually needed.
     mWindow = aParentWidget->CreateChild(trect, dx, aWidgetInitData,
                                          true).take();
   }
   else {
     nsIWidget* nearestParent = GetParent() ? GetParent()->GetNearestWidget(nullptr)
                                            : nullptr;
     if (!nearestParent) {
       // Without a parent, we can't make a popup.  This can happen
       // when printing
       return NS_ERROR_FAILURE;
     }
     mWindow =
       nearestParent->CreateChild(trect, dx, aWidgetInitData).take();
   }
   if (!mWindow) {
     return NS_ERROR_FAILURE;
   }
   InitializeWindow(aEnableDragDrop, aResetVisibility);
   return NS_OK;
 }
 void
 nsView::InitializeWindow(bool aEnableDragDrop, bool aResetVisibility)
 {
   NS_ABORT_IF_FALSE(mWindow, "Must have a window to initialize");
   mWindow->SetWidgetListener(this);
   if (aEnableDragDrop) {
     mWindow->EnableDragDrop(true);
   }
   // propagate the z-index to the widget.
   UpdateNativeWidgetZIndexes(this, FindNonAutoZIndex(this));
   //make sure visibility state is accurate
   if (aResetVisibility) {
     SetVisibility(GetVisibility());
   }
 }
 // Attach to a top level widget and start receiving mirrored events.
 nsresult nsView::AttachToTopLevelWidget(nsIWidget* aWidget)
 {
   NS_PRECONDITION(nullptr != aWidget, "null widget ptr");
   /// XXXjimm This is a temporary workaround to an issue w/document
   // viewer (bug 513162).
   nsIWidgetListener* listener = aWidget->GetAttachedWidgetListener();
   if (listener) {
     nsView *oldView = listener->GetView();
     if (oldView) {
       oldView->DetachFromTopLevelWidget();
     }
   }
   nsRefPtr<nsDeviceContext> dx = mViewManager->GetDeviceContext();
   // Note, the previous device context will be released. Detaching
   // will not restore the old one.
   nsresult rv = aWidget->AttachViewToTopLevel(!nsIWidget::UsePuppetWidgets(), dx);
   if (NS_FAILED(rv))
     return rv;
   mWindow = aWidget;
   NS_ADDREF(mWindow);
   mWindow->SetAttachedWidgetListener(this);
   mWindow->EnableDragDrop(true);
   mWidgetIsTopLevel = true;
   // Refresh the view bounds
   CalcWidgetBounds(mWindow->WindowType());
   return NS_OK;
 }
 // Detach this view from an attached widget.
 nsresult nsView::DetachFromTopLevelWidget()
 {
   NS_PRECONDITION(mWidgetIsTopLevel, "Not attached currently!");
   NS_PRECONDITION(mWindow, "null mWindow for DetachFromTopLevelWidget!");
   mWindow->SetAttachedWidgetListener(nullptr);
   NS_RELEASE(mWindow);
   mWidgetIsTopLevel = false;
   return NS_OK;
 }
 void nsView::SetZIndex(bool aAuto, int32_t aZIndex)
 {
   bool oldIsAuto = GetZIndexIsAuto();
   mVFlags = (mVFlags & ~NS_VIEW_FLAG_AUTO_ZINDEX) | (aAuto ? NS_VIEW_FLAG_AUTO_ZINDEX : 0);
   mZIndex = aZIndex;
   if (HasWidget() || !oldIsAuto || !aAuto) {
     UpdateNativeWidgetZIndexes(this, FindNonAutoZIndex(this));
   }
 }
 void nsView::AssertNoWindow()
 {
   // XXX: it would be nice to make this a strong assert
   if (MOZ_UNLIKELY(mWindow)) {
     NS_ERROR("We already have a window for this view? BAD");
     mWindow->SetWidgetListener(nullptr);
     mWindow->Destroy();
     NS_RELEASE(mWindow);
   }
 }
 //
 // internal window creation functions
 //
 void nsView::AttachWidgetEventHandler(nsIWidget* aWidget)
 {
 #ifdef DEBUG
   NS_ASSERTION(!aWidget->GetWidgetListener(), "Already have a widget listener");
 #endif
   aWidget->SetWidgetListener(this);
 }
 void nsView::DetachWidgetEventHandler(nsIWidget* aWidget)
 {
   NS_ASSERTION(!aWidget->GetWidgetListener() ||
                aWidget->GetWidgetListener()->GetView() == this, "Wrong view");
   aWidget->SetWidgetListener(nullptr);
 }
 #ifdef DEBUG
 void nsView::List(FILE* out, int32_t aIndent) const
 {
   int32_t i;
   for (i = aIndent; --i >= 0; ) fputs("  ", out);
   fprintf(out, "%p ", (void*)this);
   if (nullptr != mWindow) {
     nscoord p2a = mViewManager->AppUnitsPerDevPixel();
     nsIntRect rect;
     mWindow->GetClientBounds(rect);
     nsRect windowBounds = rect.ToAppUnits(p2a);
     mWindow->GetBounds(rect);
     nsRect nonclientBounds = rect.ToAppUnits(p2a);
     nsrefcnt widgetRefCnt = mWindow->AddRef() - 1;
     mWindow->Release();
     int32_t Z = mWindow->GetZIndex();
     fprintf(out, "(widget=%p[%" PRIuPTR "] z=%d pos={%d,%d,%d,%d}) ",
             (void*)mWindow, widgetRefCnt, Z,
             nonclientBounds.x, nonclientBounds.y,
             windowBounds.width, windowBounds.height);
   }
   nsRect brect = GetBounds();
   fprintf(out, "{%d,%d,%d,%d}",
           brect.x, brect.y, brect.width, brect.height);
   fprintf(out, " z=%d vis=%d frame=%p <\n",
           mZIndex, mVis, static_cast<void*>(mFrame));
   for (nsView* kid = mFirstChild; kid; kid = kid->GetNextSibling()) {
     NS_ASSERTION(kid->GetParent() == this, "incorrect parent");
     kid->List(out, aIndent + 1);
   }
   for (i = aIndent; --i >= 0; ) fputs("  ", out);
   fputs(">\n", out);
 }
 #endif // DEBUG
 nsPoint nsView::GetOffsetTo(const nsView* aOther) const
 {
   return GetOffsetTo(aOther, GetViewManager()->AppUnitsPerDevPixel());
 }
 nsPoint nsView::GetOffsetTo(const nsView* aOther, const int32_t aAPD) const
 {
   NS_ABORT_IF_FALSE(GetParent() || !aOther || aOther->GetParent() ||
                     this == aOther, "caller of (outer) GetOffsetTo must not "
                     "pass unrelated views");
   // We accumulate the final result in offset
   nsPoint offset(0, 0);
   // The offset currently accumulated at the current APD
   nsPoint docOffset(0, 0);
   const nsView* v = this;
   nsViewManager* currVM = v->GetViewManager();
   int32_t currAPD = currVM->AppUnitsPerDevPixel();
   const nsView* root = nullptr;
   for ( ; v != aOther && v; root = v, v = v->GetParent()) {
     nsViewManager* newVM = v->GetViewManager();
     if (newVM != currVM) {
       int32_t newAPD = newVM->AppUnitsPerDevPixel();
       if (newAPD != currAPD) {
         offset += docOffset.ConvertAppUnits(currAPD, aAPD);
         docOffset.x = docOffset.y = 0;
         currAPD = newAPD;
       }
       currVM = newVM;
     }
     docOffset += v->GetPosition();
   }
   offset += docOffset.ConvertAppUnits(currAPD, aAPD);
   if (v != aOther) {
     // Looks like aOther wasn't an ancestor of |this|.  So now we have
     // the root-VM-relative position of |this| in |offset|.  Get the
     // root-VM-relative position of aOther and subtract it.
     nsPoint negOffset = aOther->GetOffsetTo(root, aAPD);
     offset -= negOffset;
   }
   return offset;
 }
 nsPoint nsView::GetOffsetToWidget(nsIWidget* aWidget) const
 {
   nsPoint pt;
   // Get the view for widget
   nsView* widgetView = GetViewFor(aWidget);
   if (!widgetView) {
     return pt;
   }
   // Get the offset to the widget view in the widget view's APD
   // We get the offset in the widget view's APD first and then convert to our
   // APD afterwards so that we can include the widget view's ViewToWidgetOffset
   // in the sum in its native APD, and then convert the whole thing to our APD
   // so that we don't have to convert the APD of the relatively small
   // ViewToWidgetOffset by itself with a potentially large relative rounding
   // error.
   pt = -widgetView->GetOffsetTo(this);
   // Add in the offset to the widget.
   pt += widgetView->ViewToWidgetOffset();
   // Convert to our appunits.
   int32_t widgetAPD = widgetView->GetViewManager()->AppUnitsPerDevPixel();
   int32_t ourAPD = GetViewManager()->AppUnitsPerDevPixel();
   pt = pt.ConvertAppUnits(widgetAPD, ourAPD);
   return pt;
 }
 nsIWidget* nsView::GetNearestWidget(nsPoint* aOffset) const
 {
   return GetNearestWidget(aOffset, GetViewManager()->AppUnitsPerDevPixel());
 }
 nsIWidget* nsView::GetNearestWidget(nsPoint* aOffset, const int32_t aAPD) const
 {
   // aOffset is based on the view's position, which ignores any chrome on
   // attached parent widgets.
   // We accumulate the final result in pt
   nsPoint pt(0, 0);
   // The offset currently accumulated at the current APD
   nsPoint docPt(0,0);
   const nsView* v = this;
   nsViewManager* currVM = v->GetViewManager();
   int32_t currAPD = currVM->AppUnitsPerDevPixel();
   for ( ; v && !v->HasWidget(); v = v->GetParent()) {
     nsViewManager* newVM = v->GetViewManager();
     if (newVM != currVM) {
       int32_t newAPD = newVM->AppUnitsPerDevPixel();
       if (newAPD != currAPD) {
         pt += docPt.ConvertAppUnits(currAPD, aAPD);
         docPt.x = docPt.y = 0;
         currAPD = newAPD;
       }
       currVM = newVM;
     }
     docPt += v->GetPosition();
   }
   if (!v) {
     if (aOffset) {
       pt += docPt.ConvertAppUnits(currAPD, aAPD);
       *aOffset = pt;
     }
     return nullptr;
   }
   // pt is now the offset from v's origin to this view's origin.
   // We add the ViewToWidgetOffset to get the offset to the widget.
   if (aOffset) {
     docPt += v->ViewToWidgetOffset();
     pt += docPt.ConvertAppUnits(currAPD, aAPD);
     *aOffset = pt;
   }
   return v->GetWidget();
 }
 bool nsView::IsRoot() const
 {
   NS_ASSERTION(mViewManager != nullptr," View manager is null in nsView::IsRoot()");
   return mViewManager->GetRootView() == this;
 }
 nsRect
 nsView::GetBoundsInParentUnits() const
 {
   nsView* parent = GetParent();
   nsViewManager* VM = GetViewManager();
   if (this != VM->GetRootView() || !parent) {
     return mDimBounds;
   }
   int32_t ourAPD = VM->AppUnitsPerDevPixel();
   int32_t parentAPD = parent->GetViewManager()->AppUnitsPerDevPixel();
   return mDimBounds.ConvertAppUnitsRoundOut(ourAPD, parentAPD);
 }
 nsPoint
 nsView::ConvertFromParentCoords(nsPoint aPt) const
 {
   const nsView* parent = GetParent();
   if (parent) {
     aPt = aPt.ConvertAppUnits(parent->GetViewManager()->AppUnitsPerDevPixel(),
                               GetViewManager()->AppUnitsPerDevPixel());
   }
   aPt -= GetPosition();
   return aPt;
 }
 static bool
 IsPopupWidget(nsIWidget* aWidget)
 {
   return (aWidget->WindowType() == eWindowType_popup);
 }
 nsIPresShell*
 nsView::GetPresShell()
 {
   return GetViewManager()->GetPresShell();
 }
 bool
 nsView::WindowMoved(nsIWidget* aWidget, int32_t x, int32_t y)
 {
   nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
   if (pm && IsPopupWidget(aWidget)) {
     pm->PopupMoved(mFrame, nsIntPoint(x, y));
     return true;
   }
   return false;
 }
 bool
 nsView::WindowResized(nsIWidget* aWidget, int32_t aWidth, int32_t aHeight)
 {
   // The root view may not be set if this is the resize associated with
   // window creation
   SetForcedRepaint(true);
   if (this == mViewManager->GetRootView()) {
     nsRefPtr<nsDeviceContext> devContext = mViewManager->GetDeviceContext();
     // ensure DPI is up-to-date, in case of window being opened and sized
     // on a non-default-dpi display (bug 829963)
     devContext->CheckDPIChange();
     int32_t p2a = devContext->AppUnitsPerDevPixel();
     mViewManager->SetWindowDimensions(NSIntPixelsToAppUnits(aWidth, p2a),
                                       NSIntPixelsToAppUnits(aHeight, p2a));
     nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
     if (pm) {
       nsIPresShell* presShell = mViewManager->GetPresShell();
       if (presShell && presShell->GetDocument()) {
         pm->AdjustPopupsOnWindowChange(presShell);
       }
     }
     return true;
   }
   else if (IsPopupWidget(aWidget)) {
     nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
     if (pm) {
       pm->PopupResized(mFrame, nsIntSize(aWidth, aHeight));
       return true;
     }
   }
   return false;
 }
 bool
 nsView::RequestWindowClose(nsIWidget* aWidget)
 {
   if (mFrame && IsPopupWidget(aWidget) &&
       mFrame->GetType() == nsGkAtoms::menuPopupFrame) {
     nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
     if (pm) {
       pm->HidePopup(mFrame->GetContent(), false, true, false, false);
       return true;
     }
   }
   return false;
 }
 void
 nsView::WillPaintWindow(nsIWidget* aWidget)
 {
   nsRefPtr<nsViewManager> vm = mViewManager;
   vm->WillPaintWindow(aWidget);
 }
 bool
 nsView::PaintWindow(nsIWidget* aWidget, nsIntRegion aRegion)
 {
   NS_ASSERTION(this == nsView::GetViewFor(aWidget), "wrong view for widget?");
   nsRefPtr<nsViewManager> vm = mViewManager;
   bool result = vm->PaintWindow(aWidget, aRegion);
   return result;
 }
 void
 nsView::DidPaintWindow()
 {
   nsRefPtr<nsViewManager> vm = mViewManager;
   vm->DidPaintWindow();
 }
 void
 nsView::DidCompositeWindow()
 {
   nsIPresShell* presShell = mViewManager->GetPresShell();
   if (presShell) {
     nsAutoScriptBlocker scriptBlocker;
     presShell->GetPresContext()->GetDisplayRootPresContext()->GetRootPresContext()->NotifyDidPaintForSubtree(nsIPresShell::PAINT_COMPOSITE);
   }
 }
 void
 nsView::RequestRepaint()
 {
   nsIPresShell* presShell = mViewManager->GetPresShell();
   if (presShell) {
     presShell->ScheduleViewManagerFlush();
   }
 }
 nsEventStatus
 nsView::HandleEvent(WidgetGUIEvent* aEvent,
                     bool aUseAttachedEvents)
 {
   NS_PRECONDITION(nullptr != aEvent->widget, "null widget ptr");
   nsEventStatus result = nsEventStatus_eIgnore;
   nsView* view;
   if (aUseAttachedEvents) {
     nsIWidgetListener* listener = aEvent->widget->GetAttachedWidgetListener();
     view = listener ? listener->GetView() : nullptr;
   }
   else {
     view = GetViewFor(aEvent->widget);
   }
   if (view) {
     nsRefPtr<nsViewManager> vm = view->GetViewManager();
     vm->DispatchEvent(aEvent, view, &result);
   }
   return result;
 }

The Tor Browser / annotate

view/src/nsView.cpp@6474c204b198 (annotated)

view/src/nsView.cpp