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gecko-dev
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gecko-dev/layout/generic/nsCanvasFrame.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/. */
/* rendering object that goes directly inside the document's scrollbars */
#include "nsCanvasFrame.h"
#include "nsContainerFrame.h"
#include "nsCSSRendering.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsRenderingContext.h"
#include "nsGkAtoms.h"
#include "nsPresShell.h"
#include "nsIPresShell.h"
#include "nsDisplayList.h"
#include "nsCSSFrameConstructor.h"
#include "nsFrameManager.h"
#include "gfxPlatform.h"
#include "nsPrintfCString.h"
// for touchcaret
#include "nsContentList.h"
#include "nsContentCreatorFunctions.h"
#include "nsContentUtils.h"
#include "nsStyleSet.h"
// for focus
#include "nsIScrollableFrame.h"
#ifdef DEBUG_CANVAS_FOCUS
#include "nsIDocShell.h"
#endif
//#define DEBUG_CANVAS_FOCUS
using namespace mozilla;
using namespace mozilla::layout;
using namespace mozilla::gfx;
nsCanvasFrame*
NS_NewCanvasFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsCanvasFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsCanvasFrame)
NS_QUERYFRAME_HEAD(nsCanvasFrame)
NS_QUERYFRAME_ENTRY(nsCanvasFrame)
NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
nsresult
nsCanvasFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
{
if (!mContent) {
return NS_OK;
}
nsCOMPtr<nsIDocument> doc = mContent->OwnerDoc();
nsresult rv = NS_OK;
ErrorResult er;
// We won't create touch caret element if preference is not enabled.
if (PresShell::TouchCaretPrefEnabled()) {
nsRefPtr<dom::NodeInfo> nodeInfo;
// Create and append touch caret frame.
nodeInfo = doc->NodeInfoManager()->GetNodeInfo(nsGkAtoms::div, nullptr,
kNameSpaceID_XHTML,
nsIDOMNode::ELEMENT_NODE);
NS_ENSURE_TRUE(nodeInfo, NS_ERROR_OUT_OF_MEMORY);
rv = NS_NewHTMLElement(getter_AddRefs(mTouchCaretElement), nodeInfo.forget(),
mozilla::dom::NOT_FROM_PARSER);
NS_ENSURE_SUCCESS(rv, rv);
aElements.AppendElement(mTouchCaretElement);
// Add a _moz_anonclass attribute as touch caret selector.
mTouchCaretElement->SetAttribute(NS_LITERAL_STRING("_moz_anonclass"),
NS_LITERAL_STRING("mozTouchCaret"), er);
NS_ENSURE_SUCCESS(er.ErrorCode(), er.ErrorCode());
// Set touch caret to visibility: hidden by default.
nsAutoString classValue;
classValue.AppendLiteral("moz-touchcaret hidden");
rv = mTouchCaretElement->SetAttr(kNameSpaceID_None, nsGkAtoms::_class,
classValue, true);
NS_ENSURE_SUCCESS(rv, rv);
}
if (PresShell::SelectionCaretPrefEnabled()) {
// Selection caret
mSelectionCaretsStartElement = doc->CreateHTMLElement(nsGkAtoms::div);
aElements.AppendElement(mSelectionCaretsStartElement);
mSelectionCaretsEndElement = doc->CreateHTMLElement(nsGkAtoms::div);
aElements.AppendElement(mSelectionCaretsEndElement);
mSelectionCaretsStartElement->SetAttribute(NS_LITERAL_STRING("_moz_anonclass"),
NS_LITERAL_STRING("mozTouchCaret"), er);
rv = mSelectionCaretsStartElement->SetAttr(kNameSpaceID_None, nsGkAtoms::_class,
NS_LITERAL_STRING("moz-selectioncaret-left hidden"),
true);
NS_ENSURE_SUCCESS(rv, rv);
mSelectionCaretsEndElement->SetAttribute(NS_LITERAL_STRING("_moz_anonclass"),
NS_LITERAL_STRING("mozTouchCaret"), er);
rv = mSelectionCaretsEndElement->SetAttr(kNameSpaceID_None, nsGkAtoms::_class,
NS_LITERAL_STRING("moz-selectioncaret-right hidden"),
true);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
void
nsCanvasFrame::AppendAnonymousContentTo(nsBaseContentList& aElements, uint32_t aFilter)
{
aElements.MaybeAppendElement(mTouchCaretElement);
aElements.MaybeAppendElement(mSelectionCaretsStartElement);
aElements.MaybeAppendElement(mSelectionCaretsEndElement);
}
void
nsCanvasFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
nsIScrollableFrame* sf =
PresContext()->GetPresShell()->GetRootScrollFrameAsScrollable();
if (sf) {
sf->RemoveScrollPositionListener(this);
}
nsContentUtils::DestroyAnonymousContent(&mTouchCaretElement);
nsContentUtils::DestroyAnonymousContent(&mSelectionCaretsStartElement);
nsContentUtils::DestroyAnonymousContent(&mSelectionCaretsEndElement);
nsContainerFrame::DestroyFrom(aDestructRoot);
}
void
nsCanvasFrame::ScrollPositionWillChange(nscoord aX, nscoord aY)
{
if (mDoPaintFocus) {
mDoPaintFocus = false;
PresContext()->FrameManager()->GetRootFrame()->InvalidateFrameSubtree();
}
}
NS_IMETHODIMP
nsCanvasFrame::SetHasFocus(bool aHasFocus)
{
if (mDoPaintFocus != aHasFocus) {
mDoPaintFocus = aHasFocus;
PresContext()->FrameManager()->GetRootFrame()->InvalidateFrameSubtree();
if (!mAddedScrollPositionListener) {
nsIScrollableFrame* sf =
PresContext()->GetPresShell()->GetRootScrollFrameAsScrollable();
if (sf) {
sf->AddScrollPositionListener(this);
mAddedScrollPositionListener = true;
}
}
}
return NS_OK;
}
#ifdef DEBUG
void
nsCanvasFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList)
{
NS_ASSERTION(aListID != kPrincipalList ||
aChildList.IsEmpty() || aChildList.OnlyChild(),
"Primary child list can have at most one frame in it");
nsContainerFrame::SetInitialChildList(aListID, aChildList);
}
void
nsCanvasFrame::AppendFrames(ChildListID aListID,
nsFrameList& aFrameList)
{
MOZ_ASSERT(aListID == kPrincipalList, "unexpected child list");
if (!mFrames.IsEmpty()) {
for (nsFrameList::Enumerator e(aFrameList); !e.AtEnd(); e.Next()) {
// We only allow native anonymous child frame for touch caret,
// which its placeholder is added to the Principal child lists.
MOZ_ASSERT(e.get()->GetContent()->IsInNativeAnonymousSubtree(),
"invalid child list");
}
}
nsFrame::VerifyDirtyBitSet(aFrameList);
nsContainerFrame::AppendFrames(aListID, aFrameList);
}
void
nsCanvasFrame::InsertFrames(ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
// Because we only support a single child frame inserting is the same
// as appending
MOZ_ASSERT(!aPrevFrame, "unexpected previous sibling frame");
AppendFrames(aListID, aFrameList);
}
void
nsCanvasFrame::RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame)
{
MOZ_ASSERT(aListID == kPrincipalList, "unexpected child list");
nsContainerFrame::RemoveFrame(aListID, aOldFrame);
}
#endif
nsRect nsCanvasFrame::CanvasArea() const
{
// Not clear which overflow rect we want here, but it probably doesn't
// matter.
nsRect result(GetVisualOverflowRect());
nsIScrollableFrame *scrollableFrame = do_QueryFrame(GetParent());
if (scrollableFrame) {
nsRect portRect = scrollableFrame->GetScrollPortRect();
result.UnionRect(result, nsRect(nsPoint(0, 0), portRect.Size()));
}
return result;
}
void
nsDisplayCanvasBackgroundColor::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
nsPoint offset = ToReferenceFrame();
nsRect bgClipRect = frame->CanvasArea() + offset;
if (NS_GET_A(mColor) > 0) {
aCtx->SetColor(mColor);
aCtx->FillRect(bgClipRect);
}
}
#ifdef MOZ_DUMP_PAINTING
void
nsDisplayCanvasBackgroundColor::WriteDebugInfo(nsACString& aTo)
{
aTo += nsPrintfCString(" (rgba %d,%d,%d,%d)",
NS_GET_R(mColor), NS_GET_G(mColor),
NS_GET_B(mColor), NS_GET_A(mColor));
}
#endif
static void BlitSurface(gfxContext* aDest, const gfxRect& aRect, gfxASurface* aSource)
{
aDest->Translate(gfxPoint(aRect.x, aRect.y));
aDest->SetSource(aSource);
aDest->NewPath();
aDest->Rectangle(gfxRect(0, 0, aRect.width, aRect.height));
aDest->Fill();
aDest->Translate(-gfxPoint(aRect.x, aRect.y));
}
static void BlitSurface(DrawTarget* aDest, const gfxRect& aRect, DrawTarget* aSource)
{
RefPtr<SourceSurface> source = aSource->Snapshot();
aDest->DrawSurface(source,
Rect(aRect.x, aRect.y, aRect.width, aRect.height),
Rect(0, 0, aRect.width, aRect.height));
}
void
nsDisplayCanvasBackgroundImage::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
nsPoint offset = ToReferenceFrame();
nsRect bgClipRect = frame->CanvasArea() + offset;
nsRefPtr<nsRenderingContext> context;
nsRefPtr<gfxContext> dest = aCtx->ThebesContext();
nsRefPtr<gfxASurface> surf;
RefPtr<DrawTarget> dt;
nsRefPtr<gfxContext> ctx;
gfxRect destRect;
#ifndef MOZ_GFX_OPTIMIZE_MOBILE
if (IsSingleFixedPositionImage(aBuilder, bgClipRect, &destRect) &&
aBuilder->IsPaintingToWindow() && !aBuilder->IsCompositingCheap() &&
!dest->CurrentMatrix().HasNonIntegerTranslation()) {
// Snap image rectangle to nearest pixel boundaries. This is the right way
// to snap for this context, because we checked HasNonIntegerTranslation above.
destRect.Round();
if (dest->IsCairo()) {
surf = static_cast<gfxASurface*>(Frame()->Properties().Get(nsIFrame::CachedBackgroundImage()));
nsRefPtr<gfxASurface> destSurf = dest->CurrentSurface();
if (surf && surf->GetType() == destSurf->GetType()) {
BlitSurface(dest, destRect, surf);
return;
}
surf = destSurf->CreateSimilarSurface(
gfxContentType::COLOR_ALPHA,
gfxIntSize(ceil(destRect.width), ceil(destRect.height)));
} else {
dt = static_cast<DrawTarget*>(Frame()->Properties().Get(nsIFrame::CachedBackgroundImageDT()));
DrawTarget* destDT = dest->GetDrawTarget();
if (dt) {
BlitSurface(destDT, destRect, dt);
return;
}
dt = destDT->CreateSimilarDrawTarget(IntSize(ceil(destRect.width), ceil(destRect.height)), SurfaceFormat::B8G8R8A8);
}
if (surf || dt) {
if (surf) {
ctx = new gfxContext(surf);
} else {
ctx = new gfxContext(dt);
}
ctx->Translate(-gfxPoint(destRect.x, destRect.y));
context = new nsRenderingContext();
context->Init(aCtx->DeviceContext(), ctx);
}
}
#endif
PaintInternal(aBuilder,
(surf || dt) ? context.get() : aCtx,
(surf || dt) ? bgClipRect: mVisibleRect,
&bgClipRect);
if (surf) {
BlitSurface(dest, destRect, surf);
frame->Properties().Set(nsIFrame::CachedBackgroundImage(),
surf.forget().take());
}
if (dt) {
BlitSurface(dest->GetDrawTarget(), destRect, dt);
frame->Properties().Set(nsIFrame::CachedBackgroundImageDT(), dt.forget().drop());
}
}
void
nsDisplayCanvasThemedBackground::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
nsPoint offset = ToReferenceFrame();
nsRect bgClipRect = frame->CanvasArea() + offset;
PaintInternal(aBuilder, aCtx, mVisibleRect, &bgClipRect);
}
/**
* A display item to paint the focus ring for the document.
*
* The only reason this can't use nsDisplayGeneric is overriding GetBounds.
*/
class nsDisplayCanvasFocus : public nsDisplayItem {
public:
nsDisplayCanvasFocus(nsDisplayListBuilder* aBuilder, nsCanvasFrame *aFrame)
: nsDisplayItem(aBuilder, aFrame)
{
MOZ_COUNT_CTOR(nsDisplayCanvasFocus);
}
virtual ~nsDisplayCanvasFocus() {
MOZ_COUNT_DTOR(nsDisplayCanvasFocus);
}
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) MOZ_OVERRIDE
{
*aSnap = false;
// This is an overestimate, but that's not a problem.
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
return frame->CanvasArea() + ToReferenceFrame();
}
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) MOZ_OVERRIDE
{
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
frame->PaintFocus(*aCtx, ToReferenceFrame());
}
NS_DISPLAY_DECL_NAME("CanvasFocus", TYPE_CANVAS_FOCUS)
};
void
nsCanvasFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
if (GetPrevInFlow()) {
DisplayOverflowContainers(aBuilder, aDirtyRect, aLists);
}
// Force a background to be shown. We may have a background propagated to us,
// in which case StyleBackground wouldn't have the right background
// and the code in nsFrame::DisplayBorderBackgroundOutline might not give us
// a background.
// We don't have any border or outline, and our background draws over
// the overflow area, so just add nsDisplayCanvasBackground instead of
// calling DisplayBorderBackgroundOutline.
if (IsVisibleForPainting(aBuilder)) {
nsStyleContext* bgSC;
const nsStyleBackground* bg = nullptr;
bool isThemed = IsThemed();
if (!isThemed && nsCSSRendering::FindBackground(this, &bgSC)) {
bg = bgSC->StyleBackground();
}
aLists.BorderBackground()->AppendNewToTop(
new (aBuilder) nsDisplayCanvasBackgroundColor(aBuilder, this));
if (isThemed) {
aLists.BorderBackground()->AppendNewToTop(
new (aBuilder) nsDisplayCanvasThemedBackground(aBuilder, this));
return;
}
if (!bg) {
return;
}
// Create separate items for each background layer.
NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT(i, bg) {
if (bg->mLayers[i].mImage.IsEmpty()) {
continue;
}
aLists.BorderBackground()->AppendNewToTop(
new (aBuilder) nsDisplayCanvasBackgroundImage(aBuilder, this, i, bg));
}
}
nsIFrame* kid;
for (kid = GetFirstPrincipalChild(); kid; kid = kid->GetNextSibling()) {
// Put our child into its own pseudo-stack.
BuildDisplayListForChild(aBuilder, kid, aDirtyRect, aLists);
}
#ifdef DEBUG_CANVAS_FOCUS
nsCOMPtr<nsIContent> focusContent;
aPresContext->EventStateManager()->
GetFocusedContent(getter_AddRefs(focusContent));
bool hasFocus = false;
nsCOMPtr<nsISupports> container;
aPresContext->GetContainer(getter_AddRefs(container));
nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(container));
if (docShell) {
docShell->GetHasFocus(&hasFocus);
printf("%p - nsCanvasFrame::Paint R:%d,%d,%d,%d DR: %d,%d,%d,%d\n", this,
mRect.x, mRect.y, mRect.width, mRect.height,
aDirtyRect.x, aDirtyRect.y, aDirtyRect.width, aDirtyRect.height);
}
printf("%p - Focus: %s c: %p DoPaint:%s\n", docShell.get(), hasFocus?"Y":"N",
focusContent.get(), mDoPaintFocus?"Y":"N");
#endif
if (!mDoPaintFocus)
return;
// Only paint the focus if we're visible
if (!StyleVisibility()->IsVisible())
return;
aLists.Outlines()->AppendNewToTop(new (aBuilder)
nsDisplayCanvasFocus(aBuilder, this));
}
void
nsCanvasFrame::PaintFocus(nsRenderingContext& aRenderingContext, nsPoint aPt)
{
nsRect focusRect(aPt, GetSize());
nsIScrollableFrame *scrollableFrame = do_QueryFrame(GetParent());
if (scrollableFrame) {
nsRect portRect = scrollableFrame->GetScrollPortRect();
focusRect.width = portRect.width;
focusRect.height = portRect.height;
focusRect.MoveBy(scrollableFrame->GetScrollPosition());
}
// XXX use the root frame foreground color, but should we find BODY frame
// for HTML documents?
nsIFrame* root = mFrames.FirstChild();
const nsStyleColor* color = root ? root->StyleColor() : StyleColor();
if (!color) {
NS_ERROR("current color cannot be found");
return;
}
nsCSSRendering::PaintFocus(PresContext(), aRenderingContext,
focusRect, color->mColor);
}
/* virtual */ nscoord
nsCanvasFrame::GetMinWidth(nsRenderingContext *aRenderingContext)
{
nscoord result;
DISPLAY_MIN_WIDTH(this, result);
if (mFrames.IsEmpty())
result = 0;
else
result = mFrames.FirstChild()->GetMinWidth(aRenderingContext);
return result;
}
/* virtual */ nscoord
nsCanvasFrame::GetPrefWidth(nsRenderingContext *aRenderingContext)
{
nscoord result;
DISPLAY_PREF_WIDTH(this, result);
if (mFrames.IsEmpty())
result = 0;
else
result = mFrames.FirstChild()->GetPrefWidth(aRenderingContext);
return result;
}
void
nsCanvasFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsCanvasFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
NS_FRAME_TRACE_REFLOW_IN("nsCanvasFrame::Reflow");
// Initialize OUT parameter
aStatus = NS_FRAME_COMPLETE;
nsCanvasFrame* prevCanvasFrame = static_cast<nsCanvasFrame*>
(GetPrevInFlow());
if (prevCanvasFrame) {
AutoFrameListPtr overflow(aPresContext,
prevCanvasFrame->StealOverflowFrames());
if (overflow) {
NS_ASSERTION(overflow->OnlyChild(),
"must have doc root as canvas frame's only child");
nsContainerFrame::ReparentFrameViewList(*overflow, prevCanvasFrame, this);
// Prepend overflow to the our child list. There may already be
// children placeholders for fixed-pos elements, which don't get
// reflowed but must not be lost until the canvas frame is destroyed.
mFrames.InsertFrames(this, nullptr, *overflow);
}
}
// Set our size up front, since some parts of reflow depend on it
// being already set. Note that the computed height may be
// unconstrained; that's ok. Consumers should watch out for that.
SetSize(nsSize(aReflowState.ComputedWidth(), aReflowState.ComputedHeight()));
// Reflow our one and only normal child frame. It's either the root
// element's frame or a placeholder for that frame, if the root element
// is abs-pos or fixed-pos. We may have additional children which
// are placeholders for continuations of fixed-pos content, but those
// don't need to be reflowed. The normal child is always comes before
// the fixed-pos placeholders, because we insert it at the start
// of the child list, above.
nsHTMLReflowMetrics kidDesiredSize(aReflowState);
if (mFrames.IsEmpty()) {
// We have no child frame, so return an empty size
aDesiredSize.Width() = aDesiredSize.Height() = 0;
} else {
nsIFrame* kidFrame = mFrames.FirstChild();
bool kidDirty = (kidFrame->GetStateBits() & NS_FRAME_IS_DIRTY) != 0;
nsHTMLReflowState kidReflowState(aPresContext, aReflowState, kidFrame,
nsSize(aReflowState.AvailableWidth(),
aReflowState.AvailableHeight()));
if (aReflowState.mFlags.mVResize &&
(kidFrame->GetStateBits() & NS_FRAME_CONTAINS_RELATIVE_HEIGHT)) {
// Tell our kid it's being vertically resized too. Bit of a
// hack for framesets.
kidReflowState.mFlags.mVResize = true;
}
nsPoint kidPt(kidReflowState.ComputedPhysicalMargin().left,
kidReflowState.ComputedPhysicalMargin().top);
kidReflowState.ApplyRelativePositioning(&kidPt);
// Reflow the frame
ReflowChild(kidFrame, aPresContext, kidDesiredSize, kidReflowState,
kidPt.x, kidPt.y, 0, aStatus);
// Complete the reflow and position and size the child frame
FinishReflowChild(kidFrame, aPresContext, kidDesiredSize, &kidReflowState,
kidPt.x, kidPt.y, 0);
if (!NS_FRAME_IS_FULLY_COMPLETE(aStatus)) {
nsIFrame* nextFrame = kidFrame->GetNextInFlow();
NS_ASSERTION(nextFrame || aStatus & NS_FRAME_REFLOW_NEXTINFLOW,
"If it's incomplete and has no nif yet, it must flag a nif reflow.");
if (!nextFrame) {
nextFrame = aPresContext->PresShell()->FrameConstructor()->
CreateContinuingFrame(aPresContext, kidFrame, this);
SetOverflowFrames(nsFrameList(nextFrame, nextFrame));
// Root overflow containers will be normal children of
// the canvas frame, but that's ok because there
// aren't any other frames we need to isolate them from
// during reflow.
}
if (NS_FRAME_OVERFLOW_IS_INCOMPLETE(aStatus)) {
nextFrame->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
}
}
// If the child frame was just inserted, then we're responsible for making sure
// it repaints
if (kidDirty) {
// But we have a new child, which will affect our background, so
// invalidate our whole rect.
// Note: Even though we request to be sized to our child's size, our
// scroll frame ensures that we are always the size of the viewport.
// Also note: GetPosition() on a CanvasFrame is always going to return
// (0, 0). We only want to invalidate GetRect() since Get*OverflowRect()
// could also include overflow to our top and left (out of the viewport)
// which doesn't need to be painted.
nsIFrame* viewport = PresContext()->GetPresShell()->GetRootFrame();
viewport->InvalidateFrame();
}
// Return our desired size. Normally it's what we're told, but
// sometimes we can be given an unconstrained height (when a window
// is sizing-to-content), and we should compute our desired height.
aDesiredSize.Width() = aReflowState.ComputedWidth();
if (aReflowState.ComputedHeight() == NS_UNCONSTRAINEDSIZE) {
aDesiredSize.Height() = kidFrame->GetRect().height +
kidReflowState.ComputedPhysicalMargin().TopBottom();
} else {
aDesiredSize.Height() = aReflowState.ComputedHeight();
}
aDesiredSize.SetOverflowAreasToDesiredBounds();
aDesiredSize.mOverflowAreas.UnionWith(
kidDesiredSize.mOverflowAreas + kidPt);
}
if (prevCanvasFrame) {
ReflowOverflowContainerChildren(aPresContext, aReflowState,
aDesiredSize.mOverflowAreas, 0,
aStatus);
}
FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize, aReflowState, aStatus);
NS_FRAME_TRACE_REFLOW_OUT("nsCanvasFrame::Reflow", aStatus);
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
}
nsIAtom*
nsCanvasFrame::GetType() const
{
return nsGkAtoms::canvasFrame;
}
nsresult
nsCanvasFrame::GetContentForEvent(WidgetEvent* aEvent,
nsIContent** aContent)
{
NS_ENSURE_ARG_POINTER(aContent);
nsresult rv = nsFrame::GetContentForEvent(aEvent,
aContent);
if (NS_FAILED(rv) || !*aContent) {
nsIFrame* kid = mFrames.FirstChild();
if (kid) {
rv = kid->GetContentForEvent(aEvent,
aContent);
}
}
return rv;
}
#ifdef DEBUG_FRAME_DUMP
nsresult
nsCanvasFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("Canvas"), aResult);
}
#endif
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