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gecko/layout/generic/nsHTMLFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* rendering object that goes directly inside the document's scrollbars */
#include "nsIServiceManager.h"
#include "nsHTMLParts.h"
#include "nsHTMLContainerFrame.h"
#include "nsCSSRendering.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsIView.h"
#include "nsIViewManager.h"
#include "nsIRenderingContext.h"
#include "nsGUIEvent.h"
#include "nsStyleConsts.h"
#include "nsGkAtoms.h"
#include "nsIEventStateManager.h"
#include "nsIDeviceContext.h"
#include "nsIPresShell.h"
#include "nsIScrollPositionListener.h"
#include "nsDisplayList.h"
#include "nsAbsoluteContainingBlock.h"
#include "nsCSSFrameConstructor.h"
// for focus
#include "nsIDOMWindowInternal.h"
#include "nsIScrollableFrame.h"
#include "nsIScrollableView.h"
#include "nsIDocShell.h"
#include "nsICanvasFrame.h"
#ifdef DEBUG_rods
//#define DEBUG_CANVAS_FOCUS
#endif
#define CANVAS_ABS_POS_CHILD_LIST NS_CONTAINER_LIST_COUNT_INCL_OC
// Interface IDs
/**
* Root frame class.
*
* The root frame is the parent frame for the document element's frame.
* It only supports having a single child frame which must be an area
* frame
*/
class CanvasFrame : public nsHTMLContainerFrame,
public nsIScrollPositionListener,
public nsICanvasFrame {
public:
CanvasFrame(nsStyleContext* aContext)
: nsHTMLContainerFrame(aContext), mDoPaintFocus(PR_FALSE),
mAbsoluteContainer(nsGkAtoms::absoluteList) {}
NS_DECL_QUERYFRAME
NS_DECL_FRAMEARENA_HELPERS
// nsISupports (nsIScrollPositionListener)
NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr);
NS_IMETHOD Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow);
virtual void Destroy();
NS_IMETHOD SetInitialChildList(nsIAtom* aListName,
nsFrameList& aChildList);
NS_IMETHOD AppendFrames(nsIAtom* aListName,
nsFrameList& aFrameList);
NS_IMETHOD InsertFrames(nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList);
NS_IMETHOD RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame);
virtual nsIAtom* GetAdditionalChildListName(PRInt32 aIndex) const;
virtual nsFrameList GetChildList(nsIAtom* aListName) const;
virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
virtual PRBool IsContainingBlock() const { return PR_TRUE; }
virtual PRBool IsFrameOfType(PRUint32 aFlags) const
{
return nsHTMLContainerFrame::IsFrameOfType(aFlags &
~(nsIFrame::eCanContainOverflowContainers));
}
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
void PaintFocus(nsIRenderingContext& aRenderingContext, nsPoint aPt);
// nsIScrollPositionListener
NS_IMETHOD ScrollPositionWillChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
virtual void ViewPositionDidChange(nsIScrollableView* aScrollable,
nsTArray<nsIWidget::Configuration>* aConfigurations) {}
NS_IMETHOD ScrollPositionDidChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
// nsICanvasFrame
NS_IMETHOD SetHasFocus(PRBool aHasFocus);
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::canvasFrame
*/
virtual nsIAtom* GetType() const;
virtual nsresult StealFrame(nsPresContext* aPresContext,
nsIFrame* aChild,
PRBool aForceNormal)
{
NS_ASSERTION(!aForceNormal, "No-one should be passing this in here");
// CanvasFrame keeps overflow container continuations of its child
// frame in main child list
nsresult rv = nsContainerFrame::StealFrame(aPresContext, aChild, PR_TRUE);
if (NS_FAILED(rv)) {
rv = nsContainerFrame::StealFrame(aPresContext, aChild);
}
return rv;
}
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif
NS_IMETHOD GetContentForEvent(nsPresContext* aPresContext,
nsEvent* aEvent,
nsIContent** aContent);
nsRect CanvasArea() const;
protected:
virtual PRIntn GetSkipSides() const;
// Data members
PRPackedBool mDoPaintFocus;
nsCOMPtr<nsIViewManager> mViewManager;
nsAbsoluteContainingBlock mAbsoluteContainer;
private:
NS_IMETHOD_(nsrefcnt) AddRef() { return NS_OK; }
NS_IMETHOD_(nsrefcnt) Release() { return NS_OK; }
};
//----------------------------------------------------------------------
nsIFrame*
NS_NewCanvasFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) CanvasFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(CanvasFrame)
NS_IMPL_QUERY_INTERFACE1(CanvasFrame, nsIScrollPositionListener)
NS_QUERYFRAME_HEAD(CanvasFrame)
NS_QUERYFRAME_ENTRY(nsICanvasFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsHTMLContainerFrame)
NS_IMETHODIMP
CanvasFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsHTMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
mViewManager = PresContext()->GetPresShell()->GetViewManager();
nsIScrollableView* scrollingView = nsnull;
mViewManager->GetRootScrollableView(&scrollingView);
if (scrollingView) {
scrollingView->AddScrollPositionListener(this);
}
return rv;
}
void
CanvasFrame::Destroy()
{
mAbsoluteContainer.DestroyFrames(this);
nsIScrollableView* scrollingView = nsnull;
mViewManager->GetRootScrollableView(&scrollingView);
if (scrollingView) {
scrollingView->RemoveScrollPositionListener(this);
}
nsHTMLContainerFrame::Destroy();
}
NS_IMETHODIMP
CanvasFrame::ScrollPositionWillChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY)
{
#ifdef DEBUG_CANVAS_FOCUS
{
PRBool hasFocus = PR_FALSE;
nsCOMPtr<nsIViewObserver> observer;
mViewManager->GetViewObserver(*getter_AddRefs(observer));
nsCOMPtr<nsIPresShell> shell = do_QueryInterface(observer);
nsCOMPtr<nsPresContext> context;
shell->GetPresContext(getter_AddRefs(context));
nsCOMPtr<nsISupports> container;
context->GetContainer(getter_AddRefs(container));
nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(container));
if (docShell) {
docShell->GetHasFocus(&hasFocus);
}
printf("SPWC: %p HF: %s mDoPaintFocus: %s\n", docShell.get(), hasFocus?"Y":"N", mDoPaintFocus?"Y":"N");
}
#endif
if (mDoPaintFocus) {
mDoPaintFocus = PR_FALSE;
mViewManager->UpdateAllViews(NS_VMREFRESH_NO_SYNC);
}
return NS_OK;
}
NS_IMETHODIMP
CanvasFrame::ScrollPositionDidChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY)
{
return NS_OK;
}
NS_IMETHODIMP
CanvasFrame::SetHasFocus(PRBool aHasFocus)
{
if (mDoPaintFocus != aHasFocus) {
mDoPaintFocus = aHasFocus;
mViewManager->UpdateAllViews(NS_VMREFRESH_NO_SYNC);
}
return NS_OK;
}
NS_IMETHODIMP
CanvasFrame::SetInitialChildList(nsIAtom* aListName,
nsFrameList& aChildList)
{
if (nsGkAtoms::absoluteList == aListName)
return mAbsoluteContainer.SetInitialChildList(this, aListName, aChildList);
NS_ASSERTION(aListName || aChildList.IsEmpty() || aChildList.OnlyChild(),
"Primary child list can have at most one frame in it");
return nsHTMLContainerFrame::SetInitialChildList(aListName, aChildList);
}
NS_IMETHODIMP
CanvasFrame::AppendFrames(nsIAtom* aListName,
nsFrameList& aFrameList)
{
nsresult rv;
if (nsGkAtoms::absoluteList == aListName)
return mAbsoluteContainer.AppendFrames(this, aListName, aFrameList);
NS_ASSERTION(!aListName, "unexpected child list name");
NS_PRECONDITION(mFrames.IsEmpty(), "already have a child frame");
if (aListName) {
// We only support unnamed principal child list
rv = NS_ERROR_INVALID_ARG;
} else if (!mFrames.IsEmpty()) {
// We only allow a single child frame
rv = NS_ERROR_FAILURE;
} else {
// Insert the new frames
NS_ASSERTION(aFrameList.FirstChild() == aFrameList.LastChild(),
"Only one principal child frame allowed");
#ifdef NS_DEBUG
nsFrame::VerifyDirtyBitSet(aFrameList);
#endif
mFrames.AppendFrames(nsnull, aFrameList);
rv = PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
}
return rv;
}
NS_IMETHODIMP
CanvasFrame::InsertFrames(nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
nsresult rv;
if (nsGkAtoms::absoluteList == aListName)
return mAbsoluteContainer.InsertFrames(this, aListName, aPrevFrame, aFrameList);
// Because we only support a single child frame inserting is the same
// as appending
NS_PRECONDITION(!aPrevFrame, "unexpected previous sibling frame");
if (aPrevFrame) {
rv = NS_ERROR_UNEXPECTED;
} else {
rv = AppendFrames(aListName, aFrameList);
}
return rv;
}
NS_IMETHODIMP
CanvasFrame::RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame)
{
nsresult rv;
if (nsGkAtoms::absoluteList == aListName) {
mAbsoluteContainer.RemoveFrame(this, aListName, aOldFrame);
return NS_OK;
}
NS_ASSERTION(!aListName, "unexpected child list name");
if (aListName) {
// We only support the unnamed principal child list
rv = NS_ERROR_INVALID_ARG;
} else if (aOldFrame == mFrames.FirstChild()) {
// It's our one and only child frame
// Damage the area occupied by the deleted frame
// The child of the canvas probably can't have an outline, but why bother
// thinking about that?
Invalidate(aOldFrame->GetOverflowRect() + aOldFrame->GetPosition());
// Remove the frame and destroy it
mFrames.DestroyFrame(aOldFrame);
rv = PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
} else {
rv = NS_ERROR_FAILURE;
}
return rv;
}
nsIAtom*
CanvasFrame::GetAdditionalChildListName(PRInt32 aIndex) const
{
if (CANVAS_ABS_POS_CHILD_LIST == aIndex)
return nsGkAtoms::absoluteList;
return nsHTMLContainerFrame::GetAdditionalChildListName(aIndex);
}
nsFrameList
CanvasFrame::GetChildList(nsIAtom* aListName) const
{
if (nsGkAtoms::absoluteList == aListName)
return mAbsoluteContainer.GetChildList();
return nsHTMLContainerFrame::GetChildList(aListName);
}
nsRect CanvasFrame::CanvasArea() const
{
nsRect result(GetOverflowRect());
nsIScrollableFrame *scrollableFrame = do_QueryFrame(GetParent());
if (scrollableFrame) {
nsIScrollableView* scrollableView = scrollableFrame->GetScrollableView();
nsRect vcr = scrollableView->View()->GetBounds();
result.UnionRect(result, nsRect(nsPoint(0, 0), vcr.Size()));
}
return result;
}
/*
* Override nsDisplayBackground methods so that we pass aBGClipRect to
* PaintBackground, covering the whole overflow area.
*/
class nsDisplayCanvasBackground : public nsDisplayBackground {
public:
nsDisplayCanvasBackground(nsIFrame *aFrame)
: nsDisplayBackground(aFrame)
{
}
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder)
{
CanvasFrame* frame = static_cast<CanvasFrame*>(mFrame);
return frame->CanvasArea() + aBuilder->ToReferenceFrame(mFrame);
}
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsIRenderingContext* aCtx, const nsRect& aDirtyRect)
{
CanvasFrame* frame = static_cast<CanvasFrame*>(mFrame);
nsPoint offset = aBuilder->ToReferenceFrame(mFrame);
nsRect bgClipRect = frame->CanvasArea() + offset;
nsCSSRendering::PaintBackground(mFrame->PresContext(), *aCtx, mFrame,
aDirtyRect,
nsRect(offset, mFrame->GetSize()),
aBuilder->GetBackgroundPaintFlags(),
&bgClipRect);
}
NS_DISPLAY_DECL_NAME("CanvasBackground")
};
/**
* 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(CanvasFrame *aFrame)
: nsDisplayItem(aFrame)
{
}
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder)
{
// This is an overestimate, but that's not a problem.
CanvasFrame* frame = static_cast<CanvasFrame*>(mFrame);
return frame->CanvasArea() + aBuilder->ToReferenceFrame(mFrame);
}
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsIRenderingContext* aCtx, const nsRect& aDirtyRect)
{
CanvasFrame* frame = static_cast<CanvasFrame*>(mFrame);
frame->PaintFocus(*aCtx, aBuilder->ToReferenceFrame(mFrame));
}
NS_DISPLAY_DECL_NAME("CanvasFocus")
};
NS_IMETHODIMP
CanvasFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
nsresult rv;
if (GetPrevInFlow()) {
DisplayOverflowContainers(aBuilder, aDirtyRect, aLists);
}
aBuilder->MarkFramesForDisplayList(this, mAbsoluteContainer.GetChildList(),
aDirtyRect);
// Force a background to be shown. We may have a background propagated to us,
// in which case GetStyleBackground 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)) {
rv = aLists.BorderBackground()->AppendNewToTop(new (aBuilder)
nsDisplayCanvasBackground(this));
NS_ENSURE_SUCCESS(rv, rv);
}
nsIFrame* kid;
for (kid = GetFirstChild(nsnull); kid; kid = kid->GetNextSibling()) {
// Put our child into its own pseudo-stack.
rv = BuildDisplayListForChild(aBuilder, kid, aDirtyRect, aLists,
DISPLAY_CHILD_FORCE_PSEUDO_STACKING_CONTEXT);
NS_ENSURE_SUCCESS(rv, rv);
}
#ifdef DEBUG_CANVAS_FOCUS
nsCOMPtr<nsIContent> focusContent;
aPresContext->EventStateManager()->
GetFocusedContent(getter_AddRefs(focusContent));
PRBool hasFocus = PR_FALSE;
nsCOMPtr<nsISupports> container;
aPresContext->GetContainer(getter_AddRefs(container));
nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(container));
if (docShell) {
docShell->GetHasFocus(&hasFocus);
printf("%p - CanvasFrame::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 NS_OK;
// Only paint the focus if we're visible
if (!GetStyleVisibility()->IsVisible())
return NS_OK;
return aLists.Outlines()->AppendNewToTop(new (aBuilder)
nsDisplayCanvasFocus(this));
}
void
CanvasFrame::PaintFocus(nsIRenderingContext& aRenderingContext, nsPoint aPt)
{
nsRect focusRect(aPt, GetSize());
nsIScrollableFrame *scrollableFrame = do_QueryFrame(GetParent());
if (scrollableFrame) {
nsIScrollableView* scrollableView = scrollableFrame->GetScrollableView();
nsRect vcr = scrollableView->View()->GetBounds();
focusRect.width = vcr.width;
focusRect.height = vcr.height;
nscoord x,y;
scrollableView->GetScrollPosition(x, y);
focusRect.x += x;
focusRect.y += y;
}
// 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->GetStyleContext()->GetStyleColor() :
mStyleContext->GetStyleColor();
if (!color) {
NS_ERROR("current color cannot be found");
return;
}
nsCSSRendering::PaintFocus(PresContext(), aRenderingContext,
focusRect, color->mColor);
}
/* virtual */ nscoord
CanvasFrame::GetMinWidth(nsIRenderingContext *aRenderingContext)
{
nscoord result;
DISPLAY_MIN_WIDTH(this, result);
if (mFrames.IsEmpty())
result = 0;
else
result = mFrames.FirstChild()->GetMinWidth(aRenderingContext);
return result;
}
/* virtual */ nscoord
CanvasFrame::GetPrefWidth(nsIRenderingContext *aRenderingContext)
{
nscoord result;
DISPLAY_PREF_WIDTH(this, result);
if (mFrames.IsEmpty())
result = 0;
else
result = mFrames.FirstChild()->GetPrefWidth(aRenderingContext);
return result;
}
NS_IMETHODIMP
CanvasFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("CanvasFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
NS_FRAME_TRACE_REFLOW_IN("CanvasFrame::Reflow");
// Initialize OUT parameter
aStatus = NS_FRAME_COMPLETE;
CanvasFrame* prevCanvasFrame = static_cast<CanvasFrame*>
(GetPrevInFlow());
if (prevCanvasFrame) {
nsAutoPtr<nsFrameList> overflow(prevCanvasFrame->StealOverflowFrames());
if (overflow) {
NS_ASSERTION(overflow->OnlyChild(),
"must have doc root as canvas frame's only child");
nsHTMLContainerFrame::ReparentFrameViewList(aPresContext, *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, nsnull, *overflow);
}
}
// 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;
if (mFrames.IsEmpty()) {
// We have no child frame, so return an empty size
aDesiredSize.width = aDesiredSize.height = 0;
} else {
nsIFrame* kidFrame = mFrames.FirstChild();
nsRect oldKidRect = kidFrame->GetRect();
PRBool 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 = PR_TRUE;
}
nsPoint kidPt(kidReflowState.mComputedMargin.left,
kidReflowState.mComputedMargin.top);
// Apply CSS relative positioning
const nsStyleDisplay* styleDisp = kidFrame->GetStyleDisplay();
if (NS_STYLE_POSITION_RELATIVE == styleDisp->mPosition) {
kidPt += nsPoint(kidReflowState.mComputedOffsets.left,
kidReflowState.mComputedOffsets.top);
}
// 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, &kidReflowState, kidDesiredSize,
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) {
nsresult rv = aPresContext->PresShell()->FrameConstructor()->
CreateContinuingFrame(aPresContext, kidFrame, this, &nextFrame);
NS_ENSURE_SUCCESS(rv, rv);
SetOverflowFrames(aPresContext, 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 GetOverflowRect()
// 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->Invalidate(nsRect(nsPoint(0, 0), viewport->GetSize()));
} else {
nsRect newKidRect = kidFrame->GetRect();
if (newKidRect.TopLeft() == oldKidRect.TopLeft()) {
InvalidateRectDifference(oldKidRect, kidFrame->GetRect());
} else {
Invalidate(oldKidRect);
Invalidate(newKidRect);
}
}
// 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.mComputedMargin.TopBottom();
} else {
aDesiredSize.height = aReflowState.ComputedHeight();
}
aDesiredSize.mOverflowArea.UnionRect(
nsRect(0, 0, aDesiredSize.width, aDesiredSize.height),
kidDesiredSize.mOverflowArea + kidPt);
if (mAbsoluteContainer.HasAbsoluteFrames()) {
PRBool widthChanged = aDesiredSize.width != mRect.width;
PRBool heightChanged = aDesiredSize.height != mRect.height;
nsRect absPosBounds;
mAbsoluteContainer.Reflow(this, aPresContext, aReflowState, aStatus,
aDesiredSize.width, aDesiredSize.height,
PR_TRUE, widthChanged, heightChanged,
&absPosBounds);
aDesiredSize.mOverflowArea.UnionRect(aDesiredSize.mOverflowArea, absPosBounds);
}
}
if (prevCanvasFrame) {
ReflowOverflowContainerChildren(aPresContext, aReflowState,
aDesiredSize.mOverflowArea, 0,
aStatus);
}
FinishAndStoreOverflow(&aDesiredSize);
NS_FRAME_TRACE_REFLOW_OUT("CanvasFrame::Reflow", aStatus);
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
return NS_OK;
}
PRIntn
CanvasFrame::GetSkipSides() const
{
return 0;
}
nsIAtom*
CanvasFrame::GetType() const
{
return nsGkAtoms::canvasFrame;
}
NS_IMETHODIMP
CanvasFrame::GetContentForEvent(nsPresContext* aPresContext,
nsEvent* aEvent,
nsIContent** aContent)
{
NS_ENSURE_ARG_POINTER(aContent);
nsresult rv = nsFrame::GetContentForEvent(aPresContext,
aEvent,
aContent);
if (NS_FAILED(rv) || !*aContent) {
nsIFrame* kid = mFrames.FirstChild();
if (kid) {
rv = kid->GetContentForEvent(aPresContext,
aEvent,
aContent);
}
}
return rv;
}
#ifdef DEBUG
NS_IMETHODIMP
CanvasFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("Canvas"), aResult);
}
#endif
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