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-rw-r--r--view/nsViewManager.cpp985
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diff --git a/view/nsViewManager.cpp b/view/nsViewManager.cpp
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+++ b/view/nsViewManager.cpp
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+/* -*- 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 "nsViewManager.h"
+
+#include "mozilla/MouseEvents.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/PresShellInlines.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/ProfilerLabels.h"
+#include "mozilla/StartupTimeline.h"
+#include "mozilla/dom/Document.h"
+#include "nsGfxCIID.h"
+#include "nsView.h"
+#include "nsCOMPtr.h"
+#include "nsRegion.h"
+#include "nsCOMArray.h"
+#include "nsXULPopupManager.h"
+#include "nsPresContext.h"
+#include "nsRefreshDriver.h"
+#include "nsContentUtils.h" // for nsAutoScriptBlocker
+#include "nsLayoutUtils.h"
+#include "gfxPlatform.h"
+#include "WindowRenderer.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
+
+uint32_t nsViewManager::gLastUserEventTime = 0;
+
+nsViewManager::nsViewManager()
+ : mPresShell(nullptr),
+ mDelayedResize(NSCOORD_NONE, NSCOORD_NONE),
+ mRootView(nullptr),
+ mRefreshDisableCount(0),
+ mPainting(false),
+ mRecursiveRefreshPending(false),
+ mHasPendingWidgetGeometryChanges(false) {}
+
+nsViewManager::~nsViewManager() {
+ if (mRootView) {
+ // Destroy any remaining views
+ mRootView->Destroy();
+ mRootView = nullptr;
+ }
+
+ mRootViewManager = nullptr;
+
+ MOZ_RELEASE_ASSERT(!mPresShell,
+ "Releasing nsViewManager without having called Destroy on "
+ "the PresShell!");
+}
+
+// We don't hold a reference to the presentation context because it
+// holds a reference to us.
+nsresult nsViewManager::Init(nsDeviceContext* aContext) {
+ MOZ_ASSERT(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,
+ ViewVisibility aVisibilityFlag) {
+ auto* 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) {
+ MOZ_ASSERT(!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)) {
+ return;
+ }
+ // Don't resize the widget. It is already being set elsewhere.
+ mRootView->SetDimensions(newDim, true, false);
+ if (RefPtr<PresShell> presShell = mPresShell) {
+ presShell->ResizeReflow(aWidth, aHeight);
+ }
+}
+
+bool nsViewManager::ShouldDelayResize() const {
+ MOZ_ASSERT(mRootView);
+ if (!mRootView->IsEffectivelyVisible() || !mPresShell ||
+ !mPresShell->IsVisible()) {
+ return true;
+ }
+ if (nsRefreshDriver* rd = mPresShell->GetRefreshDriver()) {
+ if (rd->IsResizeSuppressed()) {
+ return true;
+ }
+ }
+ return false;
+}
+
+void nsViewManager::SetWindowDimensions(nscoord aWidth, nscoord aHeight,
+ bool aDelayResize) {
+ if (mRootView) {
+ if (!ShouldDelayResize() && !aDelayResize) {
+ 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();
+ }
+ mDelayedResize.SizeTo(NSCOORD_NONE, NSCOORD_NONE);
+ DoSetWindowDimensions(aWidth, aHeight);
+ } else {
+ mDelayedResize.SizeTo(aWidth, aHeight);
+ if (mPresShell) {
+ mPresShell->SetNeedStyleFlush();
+ mPresShell->SetNeedLayoutFlush();
+ }
+ }
+ }
+}
+
+void nsViewManager::FlushDelayedResize() {
+ if (mDelayedResize != nsSize(NSCOORD_NONE, NSCOORD_NONE)) {
+ DoSetWindowDimensions(mDelayedResize.width, mDelayedResize.height);
+ mDelayedResize.SizeTo(NSCOORD_NONE, NSCOORD_NONE);
+ }
+}
+
+// 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.ScaleToOtherAppUnitsRoundOut(
+ 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.
+ nsIWidget* widget = displayRoot->GetWidget();
+ if (widget && widget->GetWindowType() == widget::WindowType::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 LayoutDeviceIntRegion& aRegion) {
+ NS_ASSERTION(aView->GetViewManager() == this, "wrong view manager");
+
+ if (mPresShell && mPresShell->IsNeverPainting()) {
+ return;
+ }
+
+ if (aRegion.IsEmpty()) {
+ 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 (RefPtr<PresShell> presShell = mPresShell) {
+#ifdef MOZ_DUMP_PAINTING
+ if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
+ printf_stderr("--COMPOSITE-- %p\n", presShell.get());
+ }
+#endif
+ WindowRenderer* renderer = widget->GetWindowRenderer();
+ if (!renderer->NeedsWidgetInvalidation()) {
+ renderer->FlushRendering(wr::RenderReasons::WIDGET);
+ } else {
+ presShell->SyncPaintFallback(aView);
+ }
+#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;
+ }
+
+ RefPtr<PresShell> rootPresShell = mPresShell;
+ AutoTArray<nsCOMPtr<nsIWidget>, 1> widgets;
+ aView->GetViewManager()->ProcessPendingUpdatesRecurse(aView, widgets);
+ for (uint32_t i = 0; i < widgets.Length(); ++i) {
+ nsView* view = nsView::GetViewFor(widgets[i]);
+ if (view) {
+ if (view->mNeedsWindowPropertiesSync) {
+ view->mNeedsWindowPropertiesSync = false;
+ if (nsViewManager* vm = view->GetViewManager()) {
+ if (PresShell* presShell = vm->GetPresShell()) {
+ presShell->SyncWindowProperties(/* aSync */ true);
+ }
+ }
+ }
+ }
+ view = nsView::GetViewFor(widgets[i]);
+ if (view) {
+ view->ResetWidgetBounds(false, true);
+ }
+ }
+ if (rootPresShell->GetViewManager() != this) {
+ return; // presentation might have been torn down
+ }
+ 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) {
+ RefPtr<nsViewManager> viewManager = view->GetViewManager();
+ viewManager->ProcessPendingUpdatesPaint(MOZ_KnownLive(widget));
+ }
+ }
+ SetPainting(false);
+ }
+}
+
+void nsViewManager::ProcessPendingUpdatesRecurse(
+ nsView* aView, AutoTArray<nsCOMPtr<nsIWidget>, 1>& 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 (RefPtr<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();
+ }
+ }
+ nsView* view = nsView::GetViewFor(aWidget);
+
+ if (!view) {
+ NS_ERROR("FlushDelayedResize destroyed the nsView?");
+ return;
+ }
+
+ nsIWidgetListener* previousListener =
+ aWidget->GetPreviouslyAttachedWidgetListener();
+
+ if (previousListener && previousListener != view &&
+ view->IsPrimaryFramePaintSuppressed()) {
+ return;
+ }
+
+ if (RefPtr<PresShell> presShell = mPresShell) {
+#ifdef MOZ_DUMP_PAINTING
+ if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
+ printf_stderr(
+ "---- PAINT START ----PresShell(%p), nsView(%p), nsIWidget(%p)\n",
+ presShell.get(), view, aWidget);
+ }
+#endif
+
+ presShell->PaintAndRequestComposite(view, PaintFlags::None);
+ 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);
+
+ 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();
+ 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;
+ }
+
+ if (!aDamagedRegion.IsEmpty()) {
+ for (auto iter = aDamagedRegion.RectIter(); !iter.Done(); iter.Next()) {
+ LayoutDeviceIntRect bounds = ViewToWidget(aWidgetView, iter.Get());
+ widget->Invalidate(bounds);
+ }
+ }
+}
+
+static bool ShouldIgnoreInvalidation(nsViewManager* aVM) {
+ while (aVM) {
+ PresShell* presShell = aVM->GetPresShell();
+ if (!presShell || presShell->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) {
+ MOZ_ASSERT(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.ScaleToOtherAppUnitsRoundOut(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);
+ WindowRenderer* renderer = aWidget->GetWindowRenderer();
+ if (view &&
+ (view->ForcedRepaint() || !renderer->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);
+ }
+ }
+ }
+}
+
+bool nsViewManager::PaintWindow(nsIWidget* aWidget,
+ const LayoutDeviceIntRegion& 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() {
+ if (RefPtr<PresShell> presShell = mPresShell) {
+ presShell->DidPaintWindow();
+ }
+}
+
+void nsViewManager::DispatchEvent(WidgetGUIEvent* aEvent, nsView* aView,
+ nsEventStatus* aStatus) {
+ AUTO_PROFILER_LABEL("nsViewManager::DispatchEvent", OTHER);
+
+ WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
+ if ((mouseEvent &&
+ // Ignore mouse events that we synthesize.
+ mouseEvent->mReason == 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->mMessage != eMouseExitFromWidget &&
+ mouseEvent->mMessage != eMouseEnterIntoWidget) ||
+ aEvent->HasKeyEventMessage() || aEvent->HasIMEEventMessage()) {
+ 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())) {
+ 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.
+ if (RefPtr<PresShell> presShell = view->GetViewManager()->GetPresShell()) {
+ presShell->HandleEvent(frame, aEvent, false, aStatus);
+ return;
+ }
+ }
+
+ *aStatus = nsEventStatus_eIgnore;
+}
+
+// Recursively reparent widgets if necessary
+
+void nsViewManager::ReparentChildWidgets(nsView* aView, nsIWidget* aNewWidget) {
+ MOZ_ASSERT(aNewWidget, "null widget");
+
+ 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) {
+ widget->SetParent(aNewWidget);
+ }
+ } 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) {
+ MOZ_ASSERT(aParent, "Must have a parent");
+ MOZ_ASSERT(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) {
+ MOZ_ASSERT(nullptr != aParent, "null ptr");
+ MOZ_ASSERT(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::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, ViewVisibility 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;
+ }
+ if (aView->GetParent() == nullptr) {
+ return false;
+ }
+ 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!");
+}
+
+nsIWidget* nsViewManager::GetRootWidget() const {
+ if (!mRootView) {
+ return nullptr;
+ }
+ if (mRootView->HasWidget()) {
+ return mRootView->GetWidget();
+ }
+ if (mRootView->GetParent()) {
+ return mRootView->GetParent()->GetViewManager()->GetRootWidget();
+ }
+ return nullptr;
+}
+
+LayoutDeviceIntRect 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 LayoutDeviceIntRect::FromUnknownRect(
+ rect.ToOutsidePixels(AppUnitsPerDevPixel()));
+}
+
+void nsViewManager::IsPainting(bool& aIsPainting) {
+ aIsPainting = IsPainting();
+}
+
+void nsViewManager::ProcessPendingUpdates() {
+ if (!IsRootVM()) {
+ RefPtr<nsViewManager> rootViewManager = RootViewManager();
+ rootViewManager->ProcessPendingUpdates();
+ return;
+ }
+
+ // Flush things like reflows by calling WillPaint on observer presShells.
+ if (mPresShell) {
+ mPresShell->GetPresContext()->RefreshDriver()->RevokeViewManagerFlush();
+
+ RefPtr<nsViewManager> strongThis(this);
+ CallWillPaintOnObservers();
+
+ ProcessPendingUpdatesForView(mRootView, true);
+ if (mPresShell) {
+ if (nsPresContext* pc = mPresShell->GetPresContext()) {
+ pc->RefreshDriver()->ClearHasScheduleFlush();
+ }
+ }
+ }
+}
+
+void nsViewManager::UpdateWidgetGeometry() {
+ if (!IsRootVM()) {
+ RefPtr<nsViewManager> rootViewManager = RootViewManager();
+ rootViewManager->UpdateWidgetGeometry();
+ return;
+ }
+
+ if (mHasPendingWidgetGeometryChanges) {
+ mHasPendingWidgetGeometryChanges = false;
+ ProcessPendingUpdatesForView(mRootView, false);
+ }
+}
+
+/* static */ void nsViewManager::CollectVMsForWillPaint(
+ nsView* aView, nsViewManager* aParentVM,
+ nsTArray<RefPtr<nsViewManager>>& aVMs) {
+ nsViewManager* vm = aView->GetViewManager();
+ if (vm != aParentVM) {
+ aVMs.AppendElement(vm);
+ }
+
+ for (nsView* child = aView->GetFirstChild(); child;
+ child = child->GetNextSibling()) {
+ CollectVMsForWillPaint(child, vm, aVMs);
+ }
+}
+
+void nsViewManager::CallWillPaintOnObservers() {
+ MOZ_ASSERT(IsRootVM(), "Must be root VM for this to be called!");
+
+ if (!mRootView) {
+ return;
+ }
+
+ AutoTArray<RefPtr<nsViewManager>, 2> VMs;
+ CollectVMsForWillPaint(mRootView, nullptr, VMs);
+ for (const auto& vm : VMs) {
+ if (vm->GetRootView() && vm->GetRootView()->IsEffectivelyVisible()) {
+ if (RefPtr<PresShell> presShell = vm->GetPresShell()) {
+ presShell->WillPaint();
+ }
+ }
+ }
+}
+
+void nsViewManager::GetLastUserEventTime(uint32_t& aTime) {
+ aTime = gLastUserEventTime;
+}
+
+void nsViewManager::InvalidateHierarchy() {
+ if (mRootView) {
+ mRootViewManager = nullptr;
+ nsView* parent = mRootView->GetParent();
+ if (parent) {
+ mRootViewManager = parent->GetViewManager()->RootViewManager();
+ NS_ASSERTION(mRootViewManager != this,
+ "Root view had a parent, but it has the same view manager");
+ }
+ // else, we are implicitly our own root view manager.
+ }
+}