Add m-esr52 at 52.6.0

1 files changed, 1127 insertions, 0 deletions

diff --git a/view/nsView.cpp b/view/nsView.cpp
new file mode 100644
index 000000000..8f509cade
--- /dev/null
+++ b/view/nsView.cpp
@@ -0,0 +1,1127 @@
+/* -*- 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
+#include "mozilla/TimelineConsumers.h"
+#include "mozilla/CompositeTimelineMarker.h"
+
+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);
+  }
+
+  if (mPreviousWindow) {
+    mPreviousWindow->SetPreviouslyAttachedWidgetListener(nullptr);
+  }
+
+  // Destroy and release the widget
+  DestroyWidget();
+
+  delete mDirtyRegion;
+}
+
+class DestroyWidgetRunnable : public Runnable {
+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);
+
+      // Don't leak if we happen to arrive here after the main thread
+      // has disappeared.
+      nsCOMPtr<nsIThread> mainThread = do_GetMainThread();
+      if (mainThread) {
+        mainThread->Dispatch(widgetDestroyer.forget(), NS_DISPATCH_NORMAL);
+      }
+    }
+
+    mWindow = nullptr;
+  }
+}
+
+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;
+}
+
+LayoutDeviceIntRect 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)
+      LayoutDeviceIntPoint screenPoint = parentWidget->WidgetToScreenOffset();
+      viewBounds += nsPoint(NSIntPixelsToAppUnits(screenPoint.x, p2a),
+                            NSIntPixelsToAppUnits(screenPoint.y, p2a));
+    }
+  }
+
+  // Compute widget bounds in device pixels
+  LayoutDeviceIntRect newBounds =
+    LayoutDeviceIntRect::FromUnknownRect(viewBounds.ToNearestPixels(p2a));
+
+#if defined(XP_MACOSX) || (MOZ_WIDGET_GTK == 3)
+  // cocoa and GTK round 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.get();
+  uint32_t round;
+  if (aType == eWindowType_popup && widget &&
+      ((round = widget->RoundsWidgetCoordinatesTo()) > 1)) {
+    LayoutDeviceIntSize 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).
+  LayoutDeviceIntRect newBounds;
+  RefPtr<nsDeviceContext> dx = mViewManager->GetDeviceContext();
+
+  nsWindowType type = widget->WindowType();
+
+  LayoutDeviceIntRect curBounds = widget->GetClientBounds();
+  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 desktop 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).
+  DesktopToLayoutDeviceScale scale = dx->GetDesktopToDeviceScale();
+
+  DesktopRect deskRect = newBounds / scale;
+  if (changedPos) {
+    if (changedSize && !aMoveOnly) {
+      widget->ResizeClient(deskRect.x, deskRect.y,
+                           deskRect.width, deskRect.height,
+                           aInvalidateChangedSize);
+    } else {
+      widget->MoveClient(deskRect.x, deskRect.y);
+    }
+  } else {
+    if (changedSize && !aMoveOnly) {
+      widget->ResizeClient(deskRect.width, deskRect.height,
+                           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()
+{
+  if (mViewManager->GetRootView() == this)
+    mViewManager->InvalidateHierarchy();
+
+  for (nsView *child = mFirstChild; child; child = child->GetNextSibling())
+    child->InvalidateHierarchy();
+}
+
+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();
+    }
+  }
+}
+
+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();
+    }
+  }
+}
+
+// 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();
+  MOZ_ASSERT(!aWidgetInitData ||
+             aWidgetInitData->mWindowType != eWindowType_popup,
+             "Use CreateWidgetForPopup");
+
+  DefaultWidgetInitData defaultInitData;
+  bool initDataPassedIn = !!aWidgetInitData;
+  aWidgetInitData = aWidgetInitData ? aWidgetInitData : &defaultInitData;
+  defaultInitData.mListenForResizes =
+    (!initDataPassedIn && GetParent() &&
+     GetParent()->GetViewManager() != mViewManager);
+
+  LayoutDeviceIntRect trect = CalcWidgetBounds(aWidgetInitData->mWindowType);
+
+  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, aWidgetInitData, true);
+  if (!mWindow) {
+    return NS_ERROR_FAILURE;
+  }
+
+  InitializeWindow(aEnableDragDrop, aResetVisibility);
+
+  return NS_OK;
+}
+
+nsresult nsView::CreateWidgetForParent(nsIWidget* aParentWidget,
+                                        nsWidgetInitData *aWidgetInitData,
+                                        bool aEnableDragDrop,
+                                        bool aResetVisibility)
+{
+  AssertNoWindow();
+  MOZ_ASSERT(!aWidgetInitData ||
+             aWidgetInitData->mWindowType != eWindowType_popup,
+             "Use CreateWidgetForPopup");
+  MOZ_ASSERT(aParentWidget, "Parent widget required");
+
+  DefaultWidgetInitData defaultInitData;
+  aWidgetInitData = aWidgetInitData ? aWidgetInitData : &defaultInitData;
+
+  LayoutDeviceIntRect trect = CalcWidgetBounds(aWidgetInitData->mWindowType);
+
+  mWindow = aParentWidget->CreateChild(trect, aWidgetInitData);
+  if (!mWindow) {
+    return NS_ERROR_FAILURE;
+  }
+
+  InitializeWindow(aEnableDragDrop, aResetVisibility);
+
+  return NS_OK;
+}
+
+nsresult nsView::CreateWidgetForPopup(nsWidgetInitData *aWidgetInitData,
+                                       nsIWidget* aParentWidget,
+                                       bool aEnableDragDrop,
+                                       bool aResetVisibility)
+{
+  AssertNoWindow();
+  MOZ_ASSERT(aWidgetInitData, "Widget init data required");
+  MOZ_ASSERT(aWidgetInitData->mWindowType == eWindowType_popup,
+             "Use one of the other CreateWidget methods");
+
+  LayoutDeviceIntRect trect = CalcWidgetBounds(aWidgetInitData->mWindowType);
+
+  // 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, aWidgetInitData, true);
+  }
+  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, aWidgetInitData);
+  }
+  if (!mWindow) {
+    return NS_ERROR_FAILURE;
+  }
+
+  InitializeWindow(aEnableDragDrop, aResetVisibility);
+
+  return NS_OK;
+}
+
+void
+nsView::InitializeWindow(bool aEnableDragDrop, bool aResetVisibility)
+{
+  MOZ_ASSERT(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());
+  }
+}
+
+void
+nsView::SetNeedsWindowPropertiesSync()
+{
+  mNeedsWindowPropertiesSync = true;
+  if (mViewManager) {
+    mViewManager->PostPendingUpdate();
+  }
+}
+
+
+// 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();
+    }
+  }
+
+  // Note, the previous device context will be released. Detaching
+  // will not restore the old one.
+  aWidget->AttachViewToTopLevel(!nsIWidget::UsePuppetWidgets());
+
+  mWindow = aWidget;
+
+  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);
+  nsIWidgetListener* listener = mWindow->GetPreviouslyAttachedWidgetListener();
+
+  if (listener && listener->GetView()) {
+    // Ensure the listener doesn't think it's being used anymore
+    listener->GetView()->SetPreviousWidget(nullptr);
+  }
+
+  // If the new view's frame is paint suppressed then the window
+  // will want to use us instead until that's done
+  mWindow->SetPreviouslyAttachedWidgetListener(this);
+
+  mPreviousWindow = mWindow;
+  mWindow = nullptr;
+
+  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();
+    mWindow = nullptr;
+  }
+}
+
+//
+// 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();
+    LayoutDeviceIntRect rect = mWindow->GetClientBounds();
+    nsRect windowBounds = LayoutDeviceIntRect::ToAppUnits(rect, p2a);
+    rect = mWindow->GetBounds();
+    nsRect nonclientBounds = LayoutDeviceIntRect::ToAppUnits(rect, p2a);
+    nsrefcnt widgetRefCnt = mWindow.get()->AddRef() - 1;
+    mWindow.get()->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
+{
+  MOZ_ASSERT(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.ScaleToOtherAppUnits(currAPD, aAPD);
+        docOffset.x = docOffset.y = 0;
+        currAPD = newAPD;
+      }
+      currVM = newVM;
+    }
+    docOffset += v->GetPosition();
+  }
+  offset += docOffset.ScaleToOtherAppUnits(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.ScaleToOtherAppUnits(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.ScaleToOtherAppUnits(currAPD, aAPD);
+        docPt.x = docPt.y = 0;
+        currAPD = newAPD;
+      }
+      currVM = newVM;
+    }
+    docPt += v->GetPosition();
+  }
+  if (!v) {
+    if (aOffset) {
+      pt += docPt.ScaleToOtherAppUnits(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.ScaleToOtherAppUnits(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.ScaleToOtherAppUnitsRoundOut(ourAPD, parentAPD);
+}
+
+nsPoint
+nsView::ConvertFromParentCoords(nsPoint aPt) const
+{
+  const nsView* parent = GetParent();
+  if (parent) {
+    aPt = aPt.ScaleToOtherAppUnits(
+      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()) {
+    RefPtr<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, LayoutDeviceIntSize(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)
+{
+  RefPtr<nsViewManager> vm = mViewManager;
+  vm->WillPaintWindow(aWidget);
+}
+
+bool
+nsView::PaintWindow(nsIWidget* aWidget, LayoutDeviceIntRegion aRegion)
+{
+  NS_ASSERTION(this == nsView::GetViewFor(aWidget), "wrong view for widget?");
+
+  RefPtr<nsViewManager> vm = mViewManager;
+  bool result = vm->PaintWindow(aWidget, aRegion);
+  return result;
+}
+
+void
+nsView::DidPaintWindow()
+{
+  RefPtr<nsViewManager> vm = mViewManager;
+  vm->DidPaintWindow();
+}
+
+void
+nsView::DidCompositeWindow(uint64_t aTransactionId,
+                           const TimeStamp& aCompositeStart,
+                           const TimeStamp& aCompositeEnd)
+{
+  nsIPresShell* presShell = mViewManager->GetPresShell();
+  if (presShell) {
+    nsAutoScriptBlocker scriptBlocker;
+
+    nsPresContext* context = presShell->GetPresContext();
+    nsRootPresContext* rootContext = context->GetRootPresContext();
+    MOZ_ASSERT(rootContext, "rootContext must be valid.");
+    rootContext->NotifyDidPaintForSubtree(nsIPresShell::PAINT_COMPOSITE, aTransactionId,
+                                          aCompositeEnd);
+
+    // If the two timestamps are identical, this was likely a fake composite
+    // event which wouldn't be terribly useful to display.
+    if (aCompositeStart == aCompositeEnd) {
+      return;
+    }
+
+    nsIDocShell* docShell = context->GetDocShell();
+    RefPtr<TimelineConsumers> timelines = TimelineConsumers::Get();
+
+    if (timelines && timelines->HasConsumer(docShell)) {
+      timelines->AddMarkerForDocShell(docShell,
+        MakeUnique<CompositeTimelineMarker>(aCompositeStart, MarkerTracingType::START));
+      timelines->AddMarkerForDocShell(docShell,
+        MakeUnique<CompositeTimelineMarker>(aCompositeEnd, MarkerTracingType::END));
+    }
+  }
+}
+
+void
+nsView::RequestRepaint()
+{
+  nsIPresShell* presShell = mViewManager->GetPresShell();
+  if (presShell) {
+    presShell->ScheduleViewManagerFlush();
+  }
+}
+
+nsEventStatus
+nsView::HandleEvent(WidgetGUIEvent* aEvent,
+                    bool aUseAttachedEvents)
+{
+  NS_PRECONDITION(nullptr != aEvent->mWidget, "null widget ptr");
+
+  nsEventStatus result = nsEventStatus_eIgnore;
+  nsView* view;
+  if (aUseAttachedEvents) {
+    nsIWidgetListener* listener = aEvent->mWidget->GetAttachedWidgetListener();
+    view = listener ? listener->GetView() : nullptr;
+  }
+  else {
+    view = GetViewFor(aEvent->mWidget);
+  }
+
+  if (view) {
+    RefPtr<nsViewManager> vm = view->GetViewManager();
+    vm->DispatchEvent(aEvent, view, &result);
+  }
+
+  return result;
+}
+
+bool
+nsView::IsPrimaryFramePaintSuppressed()
+{
+  return mFrame ? mFrame->PresContext()->PresShell()->IsPaintingSuppressed() : false;
+}