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

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

view/src/nsViewManager.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/. */
 #define PL_ARENA_CONST_ALIGN_MASK (sizeof(void*)-1)
 #include "plarena.h"
 #include "nsAutoPtr.h"
 #include "nsViewManager.h"
 #include "nsGfxCIID.h"
 #include "nsView.h"
 #include "nsCOMPtr.h"
 #include "mozilla/MouseEvents.h"
 #include "nsRegion.h"
 #include "nsCOMArray.h"
 #include "nsIPluginWidget.h"
 #include "nsXULPopupManager.h"
 #include "nsIPresShell.h"
 #include "nsPresContext.h"
 #include "mozilla/StartupTimeline.h"
 #include "GeckoProfiler.h"
 #include "nsRefreshDriver.h"
 #include "mozilla/Preferences.h"
 #include "nsContentUtils.h" // for nsAutoScriptBlocker
 #include "nsLayoutUtils.h"
 #include "Layers.h"
 #include "gfxPlatform.h"
 #include "gfxPrefs.h"
 #include "nsIDocument.h"
 /**
    XXX TODO XXX
    DeCOMify newly private methods
    Optimize view storage
 */
 /**
    A note about platform assumptions:
    We assume that a widget is z-ordered on top of its parent.
    We do NOT assume anything about the relative z-ordering of sibling widgets. Even though
    we ask for a specific z-order, we don't assume that widget z-ordering actually works.
 */
 using namespace mozilla;
 using namespace mozilla::layers;
 #define NSCOORD_NONE      INT32_MIN
 #undef DEBUG_MOUSE_LOCATION
 int32_t nsViewManager::mVMCount = 0;
 // Weakly held references to all of the view managers
 nsVoidArray* nsViewManager::gViewManagers = nullptr;
 uint32_t nsViewManager::gLastUserEventTime = 0;
 nsViewManager::nsViewManager()
   : mDelayedResize(NSCOORD_NONE, NSCOORD_NONE)
 {
   mRootViewManager = this;
   if (gViewManagers == nullptr) {
     NS_ASSERTION(mVMCount == 0, "View Manager count is incorrect");
     // Create an array to hold a list of view managers
     gViewManagers = new nsVoidArray;
   }
   gViewManagers->AppendElement(this);
   ++mVMCount;
   // NOTE:  we use a zeroing operator new, so all data members are
   // assumed to be cleared here.
   mHasPendingWidgetGeometryChanges = false;
   mRecursiveRefreshPending = false;
 }
 nsViewManager::~nsViewManager()
 {
   if (mRootView) {
     // Destroy any remaining views
     mRootView->Destroy();
     mRootView = nullptr;
   }
   if (!IsRootVM()) {
     // We have a strong ref to mRootViewManager
     NS_RELEASE(mRootViewManager);
   }
   NS_ASSERTION((mVMCount > 0), "underflow of viewmanagers");
   --mVMCount;
 #ifdef DEBUG
   bool removed =
 #endif
     gViewManagers->RemoveElement(this);
   NS_ASSERTION(removed, "Viewmanager instance not was not in the global list of viewmanagers");
   if (0 == mVMCount) {
     // There aren't any more view managers so
     // release the global array of view managers
     NS_ASSERTION(gViewManagers != nullptr, "About to delete null gViewManagers");
     delete gViewManagers;
     gViewManagers = nullptr;
   }
   mPresShell = nullptr;
 }
 // We don't hold a reference to the presentation context because it
 // holds a reference to us.
 nsresult
 nsViewManager::Init(nsDeviceContext* aContext)
 {
   NS_PRECONDITION(nullptr != aContext, "null ptr");
   if (nullptr == aContext) {
     return NS_ERROR_NULL_POINTER;
   }
   if (nullptr != mContext) {
     return NS_ERROR_ALREADY_INITIALIZED;
   }
   mContext = aContext;
   return NS_OK;
 }
 nsView*
 nsViewManager::CreateView(const nsRect& aBounds,
                           nsView* aParent,
                           nsViewVisibility aVisibilityFlag)
 {
   nsView *v = new nsView(this, aVisibilityFlag);
   v->SetParent(aParent);
   v->SetPosition(aBounds.x, aBounds.y);
   nsRect dim(0, 0, aBounds.width, aBounds.height);
   v->SetDimensions(dim, false);
   return v;
 }
 void
 nsViewManager::SetRootView(nsView *aView)
 {
   NS_PRECONDITION(!aView || aView->GetViewManager() == this,
                   "Unexpected viewmanager on root view");
   // Do NOT destroy the current root view. It's the caller's responsibility
   // to destroy it
   mRootView = aView;
   if (mRootView) {
     nsView* parent = mRootView->GetParent();
     if (parent) {
       // Calling InsertChild on |parent| will InvalidateHierarchy() on us, so
       // no need to set mRootViewManager ourselves here.
       parent->InsertChild(mRootView, nullptr);
     } else {
       InvalidateHierarchy();
     }
     mRootView->SetZIndex(false, 0);
   }
   // Else don't touch mRootViewManager
 }
 void
 nsViewManager::GetWindowDimensions(nscoord *aWidth, nscoord *aHeight)
 {
   if (nullptr != mRootView) {
     if (mDelayedResize == nsSize(NSCOORD_NONE, NSCOORD_NONE)) {
       nsRect dim = mRootView->GetDimensions();
       *aWidth = dim.width;
       *aHeight = dim.height;
     } else {
       *aWidth = mDelayedResize.width;
       *aHeight = mDelayedResize.height;
     }
   }
   else
     {
       *aWidth = 0;
       *aHeight = 0;
     }
 }
 void nsViewManager::DoSetWindowDimensions(nscoord aWidth, nscoord aHeight)
 {
   nsRect oldDim = mRootView->GetDimensions();
   nsRect newDim(0, 0, aWidth, aHeight);
   // We care about resizes even when one dimension is already zero.
   if (!oldDim.IsEqualEdges(newDim)) {
     // Don't resize the widget. It is already being set elsewhere.
     mRootView->SetDimensions(newDim, true, false);
     if (mPresShell)
       mPresShell->ResizeReflow(aWidth, aHeight);
   }
 }
 void
 nsViewManager::SetWindowDimensions(nscoord aWidth, nscoord aHeight)
 {
   if (mRootView) {
     if (mRootView->IsEffectivelyVisible() && mPresShell && mPresShell->IsVisible()) {
       if (mDelayedResize != nsSize(NSCOORD_NONE, NSCOORD_NONE) &&
           mDelayedResize != nsSize(aWidth, aHeight)) {
         // We have a delayed resize; that now obsolete size may already have
         // been flushed to the PresContext so we need to update the PresContext
         // with the new size because if the new size is exactly the same as the
         // root view's current size then DoSetWindowDimensions will not
         // request a resize reflow (which would correct it). See bug 617076.
         mDelayedResize = nsSize(aWidth, aHeight);
         FlushDelayedResize(false);
       }
       mDelayedResize.SizeTo(NSCOORD_NONE, NSCOORD_NONE);
       DoSetWindowDimensions(aWidth, aHeight);
     } else {
       mDelayedResize.SizeTo(aWidth, aHeight);
       if (mPresShell && mPresShell->GetDocument()) {
         mPresShell->GetDocument()->SetNeedStyleFlush();
       }
     }
   }
 }
 void
 nsViewManager::FlushDelayedResize(bool aDoReflow)
 {
   if (mDelayedResize != nsSize(NSCOORD_NONE, NSCOORD_NONE)) {
     if (aDoReflow) {
       DoSetWindowDimensions(mDelayedResize.width, mDelayedResize.height);
       mDelayedResize.SizeTo(NSCOORD_NONE, NSCOORD_NONE);
     } else if (mPresShell) {
       nsPresContext* presContext = mPresShell->GetPresContext();
       if (presContext) {
         presContext->SetVisibleArea(nsRect(nsPoint(0, 0), mDelayedResize));
       }
     }
   }
 }
 // Convert aIn from being relative to and in appunits of aFromView, to being
 // relative to and in appunits of aToView.
 static nsRegion ConvertRegionBetweenViews(const nsRegion& aIn,
                                           nsView* aFromView,
                                           nsView* aToView)
 {
   nsRegion out = aIn;
   out.MoveBy(aFromView->GetOffsetTo(aToView));
   out = out.ConvertAppUnitsRoundOut(
     aFromView->GetViewManager()->AppUnitsPerDevPixel(),
     aToView->GetViewManager()->AppUnitsPerDevPixel());
   return out;
 }
 nsView* nsViewManager::GetDisplayRootFor(nsView* aView)
 {
   nsView *displayRoot = aView;
   for (;;) {
     nsView *displayParent = displayRoot->GetParent();
     if (!displayParent)
       return displayRoot;
     if (displayRoot->GetFloating() && !displayParent->GetFloating())
       return displayRoot;
     // If we have a combobox dropdown popup within a panel popup, both the view
     // for the dropdown popup and its parent will be floating, so we need to
     // distinguish this situation. We do this by looking for a widget. Any view
     // with a widget is a display root, except for plugins.
     nsIWidget* widget = displayRoot->GetWidget();
     if (widget && widget->WindowType() == eWindowType_popup) {
       NS_ASSERTION(displayRoot->GetFloating() && displayParent->GetFloating(),
         "this should only happen with floating views that have floating parents");
       return displayRoot;
     }
     displayRoot = displayParent;
   }
 }
 /**
    aRegion is given in device coordinates!!
    aContext may be null, in which case layers should be used for
    rendering.
 */
 void nsViewManager::Refresh(nsView *aView, const nsIntRegion& aRegion)
 {
   NS_ASSERTION(aView->GetViewManager() == this, "wrong view manager");
   if (mPresShell && mPresShell->IsNeverPainting()) {
     return;
   }
   // damageRegion is the damaged area, in twips, relative to the view origin
   nsRegion damageRegion = aRegion.ToAppUnits(AppUnitsPerDevPixel());
   // move region from widget coordinates into view coordinates
   damageRegion.MoveBy(-aView->ViewToWidgetOffset());
   if (damageRegion.IsEmpty()) {
 #ifdef DEBUG_roc
     nsRect viewRect = aView->GetDimensions();
     nsRect damageRect = damageRegion.GetBounds();
     printf_stderr("XXX Damage rectangle (%d,%d,%d,%d) does not intersect the widget's view (%d,%d,%d,%d)!\n",
            damageRect.x, damageRect.y, damageRect.width, damageRect.height,
            viewRect.x, viewRect.y, viewRect.width, viewRect.height);
 #endif
     return;
   }
   nsIWidget *widget = aView->GetWidget();
   if (!widget) {
     return;
   }
   NS_ASSERTION(!IsPainting(), "recursive painting not permitted");
   if (IsPainting()) {
     RootViewManager()->mRecursiveRefreshPending = true;
     return;
   }
   {
     nsAutoScriptBlocker scriptBlocker;
     SetPainting(true);
     NS_ASSERTION(GetDisplayRootFor(aView) == aView,
                  "Widgets that we paint must all be display roots");
     if (mPresShell) {
 #ifdef MOZ_DUMP_PAINTING
       if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
         printf_stderr("--COMPOSITE-- %p\n", mPresShell);
       }
 #endif
       uint32_t paintFlags = nsIPresShell::PAINT_COMPOSITE;
       LayerManager *manager = widget->GetLayerManager();
       if (!manager->NeedsWidgetInvalidation()) {
         manager->FlushRendering();
       } else {
         mPresShell->Paint(aView, damageRegion,
                           paintFlags);
       }
 #ifdef MOZ_DUMP_PAINTING
       if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
         printf_stderr("--ENDCOMPOSITE--\n");
       }
 #endif
       mozilla::StartupTimeline::RecordOnce(mozilla::StartupTimeline::FIRST_PAINT);
     }
     SetPainting(false);
   }
   if (RootViewManager()->mRecursiveRefreshPending) {
     RootViewManager()->mRecursiveRefreshPending = false;
     InvalidateAllViews();
   }
 }
 void
 nsViewManager::ProcessPendingUpdatesForView(nsView* aView,
                                             bool aFlushDirtyRegion)
 {
   NS_ASSERTION(IsRootVM(), "Updates will be missed");
   if (!aView) {
     return;
   }
   nsCOMPtr<nsIPresShell> rootShell(mPresShell);
   nsTArray<nsCOMPtr<nsIWidget> > widgets;
   aView->GetViewManager()->ProcessPendingUpdatesRecurse(aView, widgets);
   for (uint32_t i = 0; i < widgets.Length(); ++i) {
     nsView* view = nsView::GetViewFor(widgets[i]);
     if (view) {
       view->ResetWidgetBounds(false, true);
     }
   }
   if (rootShell->GetViewManager() != this) {
     return; // 'this' might have been destroyed
   }
   if (aFlushDirtyRegion) {
     nsAutoScriptBlocker scriptBlocker;
     SetPainting(true);
     for (uint32_t i = 0; i < widgets.Length(); ++i) {
       nsIWidget* widget = widgets[i];
       nsView* view = nsView::GetViewFor(widget);
       if (view) {
         view->GetViewManager()->ProcessPendingUpdatesPaint(widget);
       }
     }
     SetPainting(false);
   }
 }
 void
 nsViewManager::ProcessPendingUpdatesRecurse(nsView* aView,
                                             nsTArray<nsCOMPtr<nsIWidget> >& aWidgets)
 {
   if (mPresShell && mPresShell->IsNeverPainting()) {
     return;
   }
   for (nsView* childView = aView->GetFirstChild(); childView;
        childView = childView->GetNextSibling()) {
     childView->GetViewManager()->
       ProcessPendingUpdatesRecurse(childView, aWidgets);
   }
   nsIWidget* widget = aView->GetWidget();
   if (widget) {
     aWidgets.AppendElement(widget);
   } else {
     FlushDirtyRegionToWidget(aView);
   }
 }
 void
 nsViewManager::ProcessPendingUpdatesPaint(nsIWidget* aWidget)
 {
   if (aWidget->NeedsPaint()) {
     // If an ancestor widget was hidden and then shown, we could
     // have a delayed resize to handle.
     for (nsViewManager *vm = this; vm;
          vm = vm->mRootView->GetParent()
            ? vm->mRootView->GetParent()->GetViewManager()
            : nullptr) {
       if (vm->mDelayedResize != nsSize(NSCOORD_NONE, NSCOORD_NONE) &&
           vm->mRootView->IsEffectivelyVisible() &&
           vm->mPresShell && vm->mPresShell->IsVisible()) {
         vm->FlushDelayedResize(true);
       }
     }
     nsView* view = nsView::GetViewFor(aWidget);
     if (!view) {
       NS_ERROR("FlushDelayedResize destroyed the nsView?");
       return;
     }
     if (mPresShell) {
 #ifdef MOZ_DUMP_PAINTING
       if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
         printf_stderr("---- PAINT START ----PresShell(%p), nsView(%p), nsIWidget(%p)\n",
                       mPresShell, view, aWidget);
       }
 #endif
       mPresShell->Paint(view, nsRegion(), nsIPresShell::PAINT_LAYERS);
       view->SetForcedRepaint(false);
 #ifdef MOZ_DUMP_PAINTING
       if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
         printf_stderr("---- PAINT END ----\n");
       }
 #endif
     }
   }
   FlushDirtyRegionToWidget(nsView::GetViewFor(aWidget));
 }
 void nsViewManager::FlushDirtyRegionToWidget(nsView* aView)
 {
   NS_ASSERTION(aView->GetViewManager() == this,
                "FlushDirtyRegionToWidget called on view we don't own");
   if (!aView->HasNonEmptyDirtyRegion())
     return;
   nsRegion* dirtyRegion = aView->GetDirtyRegion();
   nsView* nearestViewWithWidget = aView;
   while (!nearestViewWithWidget->HasWidget() &&
          nearestViewWithWidget->GetParent()) {
     nearestViewWithWidget = nearestViewWithWidget->GetParent();
   }
   nsRegion r =
     ConvertRegionBetweenViews(*dirtyRegion, aView, nearestViewWithWidget);
   // If we draw the frame counter we need to make sure we invalidate the area
   // for it to make it on screen
   if (gfxPrefs::DrawFrameCounter()) {
     nsRect counterBounds = gfxPlatform::FrameCounterBounds().ToAppUnits(AppUnitsPerDevPixel());
     r = r.Or(r, counterBounds);
   }
   nsViewManager* widgetVM = nearestViewWithWidget->GetViewManager();
   widgetVM->InvalidateWidgetArea(nearestViewWithWidget, r);
   dirtyRegion->SetEmpty();
 }
 void
 nsViewManager::InvalidateView(nsView *aView)
 {
   // Mark the entire view as damaged
   InvalidateView(aView, aView->GetDimensions());
 }
 static void
 AddDirtyRegion(nsView *aView, const nsRegion &aDamagedRegion)
 {
   nsRegion* dirtyRegion = aView->GetDirtyRegion();
   if (!dirtyRegion)
     return;
   dirtyRegion->Or(*dirtyRegion, aDamagedRegion);
   dirtyRegion->SimplifyOutward(8);
 }
 void
 nsViewManager::PostPendingUpdate()
 {
   nsViewManager* rootVM = RootViewManager();
   rootVM->mHasPendingWidgetGeometryChanges = true;
   if (rootVM->mPresShell) {
     rootVM->mPresShell->ScheduleViewManagerFlush();
   }
 }
 /**
  * @param aDamagedRegion this region, relative to aWidgetView, is invalidated in
  * every widget child of aWidgetView, plus aWidgetView's own widget
  */
 void
 nsViewManager::InvalidateWidgetArea(nsView *aWidgetView,
                                     const nsRegion &aDamagedRegion)
 {
   NS_ASSERTION(aWidgetView->GetViewManager() == this,
                "InvalidateWidgetArea called on view we don't own");
   nsIWidget* widget = aWidgetView->GetWidget();
 #if 0
   nsRect dbgBounds = aDamagedRegion.GetBounds();
   printf("InvalidateWidgetArea view:%X (%d) widget:%X region: %d, %d, %d, %d\n",
     aWidgetView, aWidgetView->IsAttachedToTopLevel(),
     widget, dbgBounds.x, dbgBounds.y, dbgBounds.width, dbgBounds.height);
 #endif
   // If the widget is hidden, it don't cover nothing
   if (widget && !widget->IsVisible()) {
     return;
   }
   if (!widget) {
     // The root view or a scrolling view might not have a widget
     // (for example, during printing). We get here when we scroll
     // during printing to show selected options in a listbox, for example.
     return;
   }
   // Update all child widgets with the damage. In the process,
   // accumulate the union of all the child widget areas, or at least
   // some subset of that.
   nsRegion children;
   if (widget->GetTransparencyMode() != eTransparencyTransparent) {
     for (nsIWidget* childWidget = widget->GetFirstChild();
          childWidget;
          childWidget = childWidget->GetNextSibling()) {
       nsView* view = nsView::GetViewFor(childWidget);
       NS_ASSERTION(view != aWidgetView, "will recur infinitely");
       nsWindowType type = childWidget->WindowType();
       if (view && childWidget->IsVisible() && type != eWindowType_popup) {
         NS_ASSERTION(type == eWindowType_plugin,
                      "Only plugin or popup widgets can be children!");
         // We do not need to invalidate in plugin widgets, but we should
         // exclude them from the invalidation region IF we're not on
         // Mac. On Mac we need to draw under plugin widgets, because
         // plugin widgets are basically invisible
 #ifndef XP_MACOSX
         // GetBounds should compensate for chrome on a toplevel widget
         nsIntRect bounds;
         childWidget->GetBounds(bounds);
         nsTArray<nsIntRect> clipRects;
         childWidget->GetWindowClipRegion(&clipRects);
         for (uint32_t i = 0; i < clipRects.Length(); ++i) {
           nsRect rr = (clipRects[i] + bounds.TopLeft()).
             ToAppUnits(AppUnitsPerDevPixel());
           children.Or(children, rr - aWidgetView->ViewToWidgetOffset());
           children.SimplifyInward(20);
         }
 #endif
       }
     }
   }
   nsRegion leftOver;
   leftOver.Sub(aDamagedRegion, children);
   if (!leftOver.IsEmpty()) {
     const nsRect* r;
     for (nsRegionRectIterator iter(leftOver); (r = iter.Next());) {
       nsIntRect bounds = ViewToWidget(aWidgetView, *r);
       widget->Invalidate(bounds);
     }
   }
 }
 static bool
 ShouldIgnoreInvalidation(nsViewManager* aVM)
 {
   while (aVM) {
     nsIPresShell* shell = aVM->GetPresShell();
     if (!shell || shell->ShouldIgnoreInvalidation()) {
       return true;
     }
     nsView* view = aVM->GetRootView()->GetParent();
     aVM = view ? view->GetViewManager() : nullptr;
   }
   return false;
 }
 void
 nsViewManager::InvalidateView(nsView *aView, const nsRect &aRect)
 {
   // If painting is suppressed in the presshell or an ancestor drop all
   // invalidates, it will invalidate everything when it unsuppresses.
   if (ShouldIgnoreInvalidation(this)) {
     return;
   }
   InvalidateViewNoSuppression(aView, aRect);
 }
 void
 nsViewManager::InvalidateViewNoSuppression(nsView *aView,
                                            const nsRect &aRect)
 {
   NS_PRECONDITION(nullptr != aView, "null view");
   NS_ASSERTION(aView->GetViewManager() == this,
                "InvalidateViewNoSuppression called on view we don't own");
   nsRect damagedRect(aRect);
   if (damagedRect.IsEmpty()) {
     return;
   }
   nsView* displayRoot = GetDisplayRootFor(aView);
   nsViewManager* displayRootVM = displayRoot->GetViewManager();
   // Propagate the update to the displayRoot, since iframes, for example,
   // can overlap each other and be translucent.  So we have to possibly
   // invalidate our rect in each of the widgets we have lying about.
   damagedRect.MoveBy(aView->GetOffsetTo(displayRoot));
   int32_t rootAPD = displayRootVM->AppUnitsPerDevPixel();
   int32_t APD = AppUnitsPerDevPixel();
   damagedRect = damagedRect.ConvertAppUnitsRoundOut(APD, rootAPD);
   // accumulate this rectangle in the view's dirty region, so we can
   // process it later.
   AddDirtyRegion(displayRoot, nsRegion(damagedRect));
 }
 void
 nsViewManager::InvalidateAllViews()
 {
   if (RootViewManager() != this) {
     return RootViewManager()->InvalidateAllViews();
   }
   InvalidateViews(mRootView);
 }
 void nsViewManager::InvalidateViews(nsView *aView)
 {
   // Invalidate this view.
   InvalidateView(aView);
   // Invalidate all children as well.
   nsView* childView = aView->GetFirstChild();
   while (nullptr != childView)  {
     childView->GetViewManager()->InvalidateViews(childView);
     childView = childView->GetNextSibling();
   }
 }
 void nsViewManager::WillPaintWindow(nsIWidget* aWidget)
 {
   if (aWidget) {
     nsView* view = nsView::GetViewFor(aWidget);
     LayerManager *manager = aWidget->GetLayerManager();
     if (view &&
         (view->ForcedRepaint() || !manager->NeedsWidgetInvalidation())) {
       ProcessPendingUpdates();
       // Re-get the view pointer here since the ProcessPendingUpdates might have
       // destroyed it during CallWillPaintOnObservers.
       view = nsView::GetViewFor(aWidget);
       if (view) {
         view->SetForcedRepaint(false);
       }
     }
   }
   nsCOMPtr<nsIPresShell> shell = mPresShell;
   if (shell) {
     shell->WillPaintWindow();
   }
 }
 bool nsViewManager::PaintWindow(nsIWidget* aWidget, nsIntRegion aRegion)
 {
   if (!aWidget || !mContext)
     return false;
   NS_ASSERTION(IsPaintingAllowed(),
                "shouldn't be receiving paint events while painting is disallowed!");
   // Get the view pointer here since NS_WILL_PAINT might have
   // destroyed it during CallWillPaintOnObservers (bug 378273).
   nsView* view = nsView::GetViewFor(aWidget);
   if (view && !aRegion.IsEmpty()) {
     Refresh(view, aRegion);
   }
   return true;
 }
 void nsViewManager::DidPaintWindow()
 {
   nsCOMPtr<nsIPresShell> shell = mPresShell;
   if (shell) {
     shell->DidPaintWindow();
   }
 }
 void
 nsViewManager::DispatchEvent(WidgetGUIEvent *aEvent,
                              nsView* aView,
                              nsEventStatus* aStatus)
 {
   PROFILER_LABEL("event", "nsViewManager::DispatchEvent");
   WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
   if ((mouseEvent &&
        // Ignore mouse events that we synthesize.
        mouseEvent->reason == WidgetMouseEvent::eReal &&
        // Ignore mouse exit and enter (we'll get moves if the user
        // is really moving the mouse) since we get them when we
        // create and destroy widgets.
        mouseEvent->message != NS_MOUSE_EXIT &&
        mouseEvent->message != NS_MOUSE_ENTER) ||
       aEvent->HasKeyEventMessage() ||
       aEvent->HasIMEEventMessage() ||
       aEvent->message == NS_PLUGIN_INPUT_EVENT) {
     gLastUserEventTime = PR_IntervalToMicroseconds(PR_IntervalNow());
   }
   // Find the view whose coordinates system we're in.
   nsView* view = aView;
   bool dispatchUsingCoordinates = aEvent->IsUsingCoordinates();
   if (dispatchUsingCoordinates) {
     // Will dispatch using coordinates. Pretty bogus but it's consistent
     // with what presshell does.
     view = GetDisplayRootFor(view);
   }
   // If the view has no frame, look for a view that does.
   nsIFrame* frame = view->GetFrame();
   if (!frame &&
       (dispatchUsingCoordinates || aEvent->HasKeyEventMessage() ||
        aEvent->IsIMERelatedEvent() ||
        aEvent->IsNonRetargetedNativeEventDelivererForPlugin() ||
        aEvent->HasPluginActivationEventMessage() ||
        aEvent->message == NS_PLUGIN_RESOLUTION_CHANGED)) {
     while (view && !view->GetFrame()) {
       view = view->GetParent();
     }
     if (view) {
       frame = view->GetFrame();
     }
   }
   if (nullptr != frame) {
     // Hold a refcount to the presshell. The continued existence of the
     // presshell will delay deletion of this view hierarchy should the event
     // want to cause its destruction in, say, some JavaScript event handler.
     nsCOMPtr<nsIPresShell> shell = view->GetViewManager()->GetPresShell();
     if (shell) {
       shell->HandleEvent(frame, aEvent, false, aStatus);
 	  return;
     }
   }
   *aStatus = nsEventStatus_eIgnore;
 }
 // Recursively reparent widgets if necessary
 void nsViewManager::ReparentChildWidgets(nsView* aView, nsIWidget *aNewWidget)
 {
   NS_PRECONDITION(aNewWidget, "");
   if (aView->HasWidget()) {
     // Check to see if the parent widget is the
     // same as the new parent. If not then reparent
     // the widget, otherwise there is nothing more
     // to do for the view and its descendants
     nsIWidget* widget = aView->GetWidget();
     nsIWidget* parentWidget = widget->GetParent();
     if (parentWidget) {
       // Child widget
       if (parentWidget != aNewWidget) {
 #ifdef DEBUG
         nsresult rv =
 #endif
           widget->SetParent(aNewWidget);
         NS_ASSERTION(NS_SUCCEEDED(rv), "SetParent failed!");
       }
     } else {
       // Toplevel widget (popup, dialog, etc)
       widget->ReparentNativeWidget(aNewWidget);
     }
     return;
   }
   // Need to check each of the views children to see
   // if they have a widget and reparent it.
   for (nsView *kid = aView->GetFirstChild(); kid; kid = kid->GetNextSibling()) {
     ReparentChildWidgets(kid, aNewWidget);
   }
 }
 // Reparent a view and its descendant views widgets if necessary
 void nsViewManager::ReparentWidgets(nsView* aView, nsView *aParent)
 {
   NS_PRECONDITION(aParent, "Must have a parent");
   NS_PRECONDITION(aView, "Must have a view");
   // Quickly determine whether the view has pre-existing children or a
   // widget. In most cases the view will not have any pre-existing
   // children when this is called.  Only in the case
   // where a view has been reparented by removing it from
   // a reinserting it into a new location in the view hierarchy do we
   // have to consider reparenting the existing widgets for the view and
   // it's descendants.
   if (aView->HasWidget() || aView->GetFirstChild()) {
     nsIWidget* parentWidget = aParent->GetNearestWidget(nullptr);
     if (parentWidget) {
       ReparentChildWidgets(aView, parentWidget);
       return;
     }
     NS_WARNING("Can not find a widget for the parent view");
   }
 }
 void
 nsViewManager::InsertChild(nsView *aParent, nsView *aChild, nsView *aSibling,
                            bool aAfter)
 {
   NS_PRECONDITION(nullptr != aParent, "null ptr");
   NS_PRECONDITION(nullptr != aChild, "null ptr");
   NS_ASSERTION(aSibling == nullptr || aSibling->GetParent() == aParent,
                "tried to insert view with invalid sibling");
   NS_ASSERTION(!IsViewInserted(aChild), "tried to insert an already-inserted view");
   if ((nullptr != aParent) && (nullptr != aChild))
     {
       // if aAfter is set, we will insert the child after 'prev' (i.e. after 'kid' in document
       // order, otherwise after 'kid' (i.e. before 'kid' in document order).
       if (nullptr == aSibling) {
         if (aAfter) {
           // insert at end of document order, i.e., before first view
           // this is the common case, by far
           aParent->InsertChild(aChild, nullptr);
           ReparentWidgets(aChild, aParent);
         } else {
           // insert at beginning of document order, i.e., after last view
           nsView *kid = aParent->GetFirstChild();
           nsView *prev = nullptr;
           while (kid) {
             prev = kid;
             kid = kid->GetNextSibling();
           }
           // prev is last view or null if there are no children
           aParent->InsertChild(aChild, prev);
           ReparentWidgets(aChild, aParent);
         }
       } else {
         nsView *kid = aParent->GetFirstChild();
         nsView *prev = nullptr;
         while (kid && aSibling != kid) {
           //get the next sibling view
           prev = kid;
           kid = kid->GetNextSibling();
         }
         NS_ASSERTION(kid != nullptr,
                      "couldn't find sibling in child list");
         if (aAfter) {
           // insert after 'kid' in document order, i.e. before in view order
           aParent->InsertChild(aChild, prev);
           ReparentWidgets(aChild, aParent);
         } else {
           // insert before 'kid' in document order, i.e. after in view order
           aParent->InsertChild(aChild, kid);
           ReparentWidgets(aChild, aParent);
         }
       }
       // if the parent view is marked as "floating", make the newly added view float as well.
       if (aParent->GetFloating())
         aChild->SetFloating(true);
     }
 }
 void
 nsViewManager::InsertChild(nsView *aParent, nsView *aChild, int32_t aZIndex)
 {
   // no-one really calls this with anything other than aZIndex == 0 on a fresh view
   // XXX this method should simply be eliminated and its callers redirected to the real method
   SetViewZIndex(aChild, false, aZIndex);
   InsertChild(aParent, aChild, nullptr, true);
 }
 void
 nsViewManager::RemoveChild(nsView *aChild)
 {
   NS_ASSERTION(aChild, "aChild must not be null");
   nsView* parent = aChild->GetParent();
   if (nullptr != parent) {
     NS_ASSERTION(aChild->GetViewManager() == this ||
                  parent->GetViewManager() == this, "wrong view manager");
     parent->RemoveChild(aChild);
   }
 }
 void
 nsViewManager::MoveViewTo(nsView *aView, nscoord aX, nscoord aY)
 {
   NS_ASSERTION(aView->GetViewManager() == this, "wrong view manager");
   aView->SetPosition(aX, aY);
 }
 void
 nsViewManager::ResizeView(nsView *aView, const nsRect &aRect, bool aRepaintExposedAreaOnly)
 {
   NS_ASSERTION(aView->GetViewManager() == this, "wrong view manager");
   nsRect oldDimensions = aView->GetDimensions();
   if (!oldDimensions.IsEqualEdges(aRect)) {
     aView->SetDimensions(aRect, true);
   }
   // Note that if layout resizes the view and the view has a custom clip
   // region set, then we expect layout to update the clip region too. Thus
   // in the case where mClipRect has been optimized away to just be a null
   // pointer, and this resize is implicitly changing the clip rect, it's OK
   // because layout will change it back again if necessary.
 }
 void
 nsViewManager::SetViewFloating(nsView *aView, bool aFloating)
 {
   NS_ASSERTION(!(nullptr == aView), "no view");
   aView->SetFloating(aFloating);
 }
 void
 nsViewManager::SetViewVisibility(nsView *aView, nsViewVisibility aVisible)
 {
   NS_ASSERTION(aView->GetViewManager() == this, "wrong view manager");
   if (aVisible != aView->GetVisibility()) {
     aView->SetVisibility(aVisible);
   }
 }
 bool nsViewManager::IsViewInserted(nsView *aView)
 {
   if (mRootView == aView) {
     return true;
   } else if (aView->GetParent() == nullptr) {
     return false;
   } else {
     nsView* view = aView->GetParent()->GetFirstChild();
     while (view != nullptr) {
       if (view == aView) {
         return true;
       }
       view = view->GetNextSibling();
     }
     return false;
   }
 }
 void
 nsViewManager::SetViewZIndex(nsView *aView, bool aAutoZIndex, int32_t aZIndex)
 {
   NS_ASSERTION((aView != nullptr), "no view");
   // don't allow the root view's z-index to be changed. It should always be zero.
   // This could be removed and replaced with a style rule, or just removed altogether, with interesting consequences
   if (aView == mRootView) {
     return;
   }
   if (aAutoZIndex) {
     aZIndex = 0;
   }
   aView->SetZIndex(aAutoZIndex, aZIndex);
 }
 nsViewManager*
 nsViewManager::IncrementDisableRefreshCount()
 {
   if (!IsRootVM()) {
     return RootViewManager()->IncrementDisableRefreshCount();
   }
   ++mRefreshDisableCount;
   return this;
 }
 void
 nsViewManager::DecrementDisableRefreshCount()
 {
   NS_ASSERTION(IsRootVM(), "Should only be called on root");
   --mRefreshDisableCount;
   NS_ASSERTION(mRefreshDisableCount >= 0, "Invalid refresh disable count!");
 }
 void
 nsViewManager::GetRootWidget(nsIWidget **aWidget)
 {
   if (!mRootView) {
     *aWidget = nullptr;
     return;
   }
   if (mRootView->HasWidget()) {
     *aWidget = mRootView->GetWidget();
     NS_ADDREF(*aWidget);
     return;
   }
   if (mRootView->GetParent()) {
     mRootView->GetParent()->GetViewManager()->GetRootWidget(aWidget);
     return;
   }
   *aWidget = nullptr;
 }
 nsIntRect nsViewManager::ViewToWidget(nsView *aView, const nsRect &aRect) const
 {
   NS_ASSERTION(aView->GetViewManager() == this, "wrong view manager");
   // account for the view's origin not lining up with the widget's
   nsRect rect = aRect + aView->ViewToWidgetOffset();
   // finally, convert to device coordinates.
   return rect.ToOutsidePixels(AppUnitsPerDevPixel());
 }
 void
 nsViewManager::IsPainting(bool& aIsPainting)
 {
   aIsPainting = IsPainting();
 }
 void
 nsViewManager::ProcessPendingUpdates()
 {
   if (!IsRootVM()) {
     RootViewManager()->ProcessPendingUpdates();
     return;
   }
   mPresShell->GetPresContext()->RefreshDriver()->RevokeViewManagerFlush();
   // Flush things like reflows by calling WillPaint on observer presShells.
   if (mPresShell) {
     CallWillPaintOnObservers();
   }
   ProcessPendingUpdatesForView(mRootView, true);
 }
 void
 nsViewManager::UpdateWidgetGeometry()
 {
   if (!IsRootVM()) {
     RootViewManager()->UpdateWidgetGeometry();
     return;
   }
   if (mHasPendingWidgetGeometryChanges) {
     mHasPendingWidgetGeometryChanges = false;
     ProcessPendingUpdatesForView(mRootView, false);
   }
 }
 void
 nsViewManager::CallWillPaintOnObservers()
 {
   NS_PRECONDITION(IsRootVM(), "Must be root VM for this to be called!");
   int32_t index;
   for (index = 0; index < mVMCount; index++) {
     nsViewManager* vm = (nsViewManager*)gViewManagers->ElementAt(index);
     if (vm->RootViewManager() == this) {
       // One of our kids.
       if (vm->mRootView && vm->mRootView->IsEffectivelyVisible()) {
         nsCOMPtr<nsIPresShell> shell = vm->GetPresShell();
         if (shell) {
           shell->WillPaint();
         }
       }
     }
   }
 }
 void
 nsViewManager::GetLastUserEventTime(uint32_t& aTime)
 {
   aTime = gLastUserEventTime;
 }
 void
 nsViewManager::InvalidateHierarchy()
 {
   if (mRootView) {
     if (!IsRootVM()) {
       NS_RELEASE(mRootViewManager);
     }
     nsView *parent = mRootView->GetParent();
     if (parent) {
       mRootViewManager = parent->GetViewManager()->RootViewManager();
       NS_ADDREF(mRootViewManager);
       NS_ASSERTION(mRootViewManager != this,
                    "Root view had a parent, but it has the same view manager");
     } else {
       mRootViewManager = this;
     }
   }
 }

The Tor Browser / annotate

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

view/src/nsViewManager.cpp