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gecko-dev/layout/generic/nsHTMLFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#include "nsIServiceManager.h"
#include "nsHTMLParts.h"
#include "nsHTMLContainerFrame.h"
#include "nsCSSRendering.h"
#include "nsIDocument.h"
#include "nsIReflowCommand.h"
#include "nsIPresContext.h"
#include "nsIStyleContext.h"
#include "nsViewsCID.h"
#include "nsIView.h"
#include "nsIViewManager.h"
#include "nsIWidget.h"
#include "nsHTMLIIDs.h"
#include "nsPageFrame.h"
#include "nsIRenderingContext.h"
#include "nsGUIEvent.h"
#include "nsIDOMEvent.h"
#include "nsStyleConsts.h"
#include "nsIViewManager.h"
#include "nsHTMLAtoms.h"
#include "nsIEventStateManager.h"
#include "nsIDeviceContext.h"
#include "nsIScrollableView.h"
#include "nsLayoutAtoms.h"
#include "nsIPresShell.h"
#include "nsIScrollPositionListener.h"
// for focus
#include "nsIDOMWindowInternal.h"
#include "nsIScriptGlobalObject.h"
#include "nsIFocusController.h"
#include "nsPIDOMWindow.h"
#include "nsIScrollableFrame.h"
#include "nsIScrollableView.h"
#include "nsIDocShell.h"
#include "nsICanvasFrame.h"
#ifdef DEBUG_rods
//#define DEBUG_CANVAS_FOCUS
#endif
// 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() : mDoPaintFocus(PR_FALSE) {}
// nsISupports
NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr);
NS_IMETHOD Init(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow);
NS_IMETHOD AppendFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aFrameList);
NS_IMETHOD InsertFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList);
NS_IMETHOD RemoveFrame(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame);
NS_IMETHOD Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
NS_IMETHOD HandleEvent(nsIPresContext* aPresContext,
nsGUIEvent* aEvent,
nsEventStatus* aEventStatus);
NS_IMETHOD GetFrameForPoint(nsIPresContext* aPresContext,
const nsPoint& aPoint,
nsFramePaintLayer aWhichLayer,
nsIFrame** aFrame);
NS_IMETHOD IsPercentageBase(PRBool& aBase) const {
aBase = PR_TRUE;
return NS_OK;
}
NS_IMETHOD Paint(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer);
// nsIScrollPositionListener
NS_IMETHOD ScrollPositionWillChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
NS_IMETHOD ScrollPositionDidChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
// nsICanvasFrame
NS_IMETHOD SetHasFocus(PRBool aHasFocus) { mDoPaintFocus = aHasFocus; return NS_OK; }
/**
* Get the "type" of the frame
*
* @see nsLayoutAtoms::canvasFrame
*/
NS_IMETHOD GetFrameType(nsIAtom** aType) const;
NS_IMETHOD AttributeChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aHint);
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsString& aResult) const;
NS_IMETHOD SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const;
#endif
NS_IMETHOD GetContentForEvent(nsIPresContext* aPresContext,
nsEvent* aEvent,
nsIContent** aContent);
protected:
virtual PRIntn GetSkipSides() const;
void DrawDottedRect(nsIRenderingContext& aRenderingContext, nsRect& aRect);
// Data members
PRPackedBool mDoPaintFocus;
nsCOMPtr<nsIPresContext> mPresContext;
private:
NS_IMETHOD_(nsrefcnt) AddRef() { return NS_OK; }
NS_IMETHOD_(nsrefcnt) Release() { return NS_OK; }
};
//----------------------------------------------------------------------
nsresult
NS_NewCanvasFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
if (nsnull == aNewFrame) {
return NS_ERROR_NULL_POINTER;
}
CanvasFrame* it = new (aPresShell)CanvasFrame;
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aNewFrame = it;
return NS_OK;
}
//--------------------------------------------------------------
// Frames are not refcounted, no need to AddRef
NS_IMETHODIMP
CanvasFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
{
NS_PRECONDITION(0 != aInstancePtr, "null ptr");
if (NULL == aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if (aIID.Equals(NS_GET_IID(nsIScrollPositionListener))) {
*aInstancePtr = (void*) ((nsIScrollPositionListener*) this);
return NS_OK;
}
if (aIID.Equals(NS_GET_IID(nsICanvasFrame))) {
*aInstancePtr = (void*) ((nsICanvasFrame*) this);
return NS_OK;
}
return nsHTMLContainerFrame::QueryInterface(aIID, aInstancePtr);
}
NS_IMETHODIMP
CanvasFrame::Init(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsHTMLContainerFrame::Init(aPresContext,aContent,aParent,aContext,aPrevInFlow);
mPresContext = aPresContext;
nsCOMPtr<nsIPresShell> presShell;
aPresContext->GetShell(getter_AddRefs(presShell));
nsCOMPtr<nsIViewManager> vm;
presShell->GetViewManager(getter_AddRefs(vm));
nsIScrollableView* scrollingView = nsnull;
vm->GetRootScrollableView(&scrollingView);
if (scrollingView) {
scrollingView->AddScrollPositionListener((nsIScrollPositionListener *)this);
}
return rv;
}
NS_IMETHODIMP
CanvasFrame::ScrollPositionWillChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY)
{
#ifdef DEBUG_CANVAS_FOCUS
{
PRBool hasFocus = PR_FALSE;
nsCOMPtr<nsISupports> container;
mPresContext->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;
nsCOMPtr<nsIPresShell> presShell;
mPresContext->GetShell(getter_AddRefs(presShell));
if (presShell) {
nsCOMPtr<nsIViewManager> vm;
presShell->GetViewManager(getter_AddRefs(vm));
if (vm) {
vm->UpdateAllViews(NS_VMREFRESH_NO_SYNC);
}
}
}
return NS_OK;
}
NS_IMETHODIMP
CanvasFrame::ScrollPositionDidChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY)
{
return NS_OK;
}
NS_IMETHODIMP
CanvasFrame::AppendFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aFrameList)
{
nsresult rv;
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
#ifdef NS_DEBUG
nsFrame::VerifyDirtyBitSet(aFrameList);
#endif
mFrames.AppendFrame(nsnull, aFrameList);
// Generate a reflow command to reflow the newly inserted frame
nsIReflowCommand* reflowCmd;
rv = NS_NewHTMLReflowCommand(&reflowCmd, this, nsIReflowCommand::ReflowDirty);
if (NS_SUCCEEDED(rv)) {
aPresShell.AppendReflowCommand(reflowCmd);
NS_RELEASE(reflowCmd);
}
}
return rv;
}
NS_IMETHODIMP
CanvasFrame::InsertFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList)
{
nsresult rv;
// 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(aPresContext, aPresShell, aListName, aFrameList);
}
return rv;
}
NS_IMETHODIMP
CanvasFrame::RemoveFrame(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame)
{
nsresult rv;
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
nsRect damageRect;
aOldFrame->GetRect(damageRect);
Invalidate(aPresContext, damageRect, PR_FALSE);
// Remove the frame and destroy it
mFrames.DestroyFrame(aPresContext, aOldFrame);
// Generate a reflow command so we get reflowed
nsIReflowCommand* reflowCmd;
rv = NS_NewHTMLReflowCommand(&reflowCmd, this, nsIReflowCommand::ReflowDirty);
if (NS_SUCCEEDED(rv)) {
aPresShell.AppendReflowCommand(reflowCmd);
NS_RELEASE(reflowCmd);
}
} else {
rv = NS_ERROR_FAILURE;
}
return rv;
}
void
CanvasFrame::DrawDottedRect(nsIRenderingContext& aRenderingContext, nsRect& aRect)
{
#ifdef DEBUG_CANVAS_FOCUS
printf("** DrawDottedRect: %d,%d,%d,%d\n",aRect.x, aRect.y, aRect.width, aRect.height);
#endif
aRenderingContext.DrawLine(aRect.x, aRect.y,
aRect.x+aRect.width, aRect.y);
aRenderingContext.DrawLine(aRect.x+aRect.width, aRect.y,
aRect.x+aRect.width, aRect.y+aRect.height);
aRenderingContext.DrawLine(aRect.x+aRect.width, aRect.y+aRect.height,
aRect.x, aRect.y+aRect.height);
aRenderingContext.DrawLine(aRect.x, aRect.y+aRect.height,
aRect.x, aRect.y);
aRenderingContext.DrawLine(aRect.x, aRect.y+aRect.height,
aRect.x, aRect.y);
}
NS_IMETHODIMP
CanvasFrame::Paint(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer)
{
if (NS_FRAME_PAINT_LAYER_BACKGROUND == aWhichLayer) {
SetDefaultBackgroundColor(aPresContext);
}
nsresult rv = nsHTMLContainerFrame::Paint(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer);
if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer) {
#ifdef DEBUG_CANVAS_FOCUS
nsCOMPtr<nsIContent> focusContent;
nsCOMPtr<nsIEventStateManager> esm;
aPresContext->GetEventStateManager(getter_AddRefs(esm));
if (esm) {
esm->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) {
aRenderingContext.PushState();
PRBool clipEmpty;
nsRect focusRect;
GetRect(focusRect);
/////////////////////
// draw focus
// XXX This is only temporary
const nsStyleVisibility* vis = (const nsStyleVisibility*)mStyleContext->GetStyleData(eStyleStruct_Visibility);
// Only paint the focus if we're visible
if (vis->IsVisible()) {
nsCOMPtr<nsIEventStateManager> stateManager;
nsresult rv = aPresContext->GetEventStateManager(getter_AddRefs(stateManager));
if (NS_SUCCEEDED(rv)) {
nsIFrame * parentFrame;
GetParent(&parentFrame);
nsIScrollableFrame* scrollableFrame;
if (NS_SUCCEEDED(parentFrame->QueryInterface(NS_GET_IID(nsIScrollableFrame), (void**)&scrollableFrame))) {
nscoord width, height;
scrollableFrame->GetClipSize(aPresContext, &width, &height);
}
nsIView* parentView;
parentFrame->GetView(aPresContext, &parentView);
nsIScrollableView* scrollableView;
if (NS_SUCCEEDED(parentView->QueryInterface(NS_GET_IID(nsIScrollableView), (void**)&scrollableView))) {
nscoord width, height;
scrollableView->GetContainerSize(&width, &height);
const nsIView* clippedView;
scrollableView->GetClipView(&clippedView);
nsRect vcr;
clippedView->GetBounds(vcr);
focusRect.height = vcr.height;
nscoord x,y;
scrollableView->GetScrollPosition(x, y);
focusRect.x += x;
focusRect.y += y;
}
aRenderingContext.SetLineStyle(nsLineStyle_kDotted);
aRenderingContext.SetColor(NS_RGB(0,0,0));
float p2t;
aPresContext->GetPixelsToTwips(&p2t);
nscoord onePixel = NSIntPixelsToTwips(1, p2t);
focusRect.width -= onePixel;
focusRect.height -= onePixel;
DrawDottedRect(aRenderingContext, focusRect);
focusRect.Deflate(onePixel, onePixel);
DrawDottedRect(aRenderingContext, focusRect);
}
}
aRenderingContext.PopState(clipEmpty);
}
}
return rv;
}
NS_IMETHODIMP
CanvasFrame::Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("CanvasFrame", aReflowState.reason);
NS_FRAME_TRACE_REFLOW_IN("CanvasFrame::Reflow");
NS_PRECONDITION(nsnull == aDesiredSize.maxElementSize, "unexpected request");
// Initialize OUT parameter
aStatus = NS_FRAME_COMPLETE;
PRBool isStyleChange = PR_FALSE;
PRBool isDirtyChildReflow = PR_FALSE;
// Check for an incremental reflow
if (eReflowReason_Incremental == aReflowState.reason) {
// See if we're the target frame
nsIFrame* targetFrame;
aReflowState.reflowCommand->GetTarget(targetFrame);
if (this == targetFrame) {
// Get the reflow type
nsIReflowCommand::ReflowType reflowType;
aReflowState.reflowCommand->GetType(reflowType);
switch (reflowType) {
case nsIReflowCommand::ReflowDirty:
isDirtyChildReflow = PR_TRUE;
break;
case nsIReflowCommand::StyleChanged:
// Remember it's a style change so we can set the reflow reason below
isStyleChange = PR_TRUE;
break;
default:
NS_ASSERTION(PR_FALSE, "unexpected reflow command type");
}
} else {
nsIFrame* nextFrame;
// Get the next frame in the reflow chain
aReflowState.reflowCommand->GetNext(nextFrame);
NS_ASSERTION(nextFrame == mFrames.FirstChild(), "unexpected next reflow command frame");
}
}
// Reflow our one and only child frame
nsHTMLReflowMetrics kidDesiredSize(nsnull);
if (mFrames.IsEmpty()) {
// We have no child frame, so return an empty size
aDesiredSize.width = aDesiredSize.height = 0;
aDesiredSize.ascent = aDesiredSize.descent = 0;
} else {
nsIFrame* kidFrame = mFrames.FirstChild();
// We must specify an unconstrained available height, because constrained
// is only for when we're paginated...
nsHTMLReflowState kidReflowState(aPresContext, aReflowState, kidFrame,
nsSize(aReflowState.availableWidth,
NS_UNCONSTRAINEDSIZE));
if (isDirtyChildReflow) {
// Note: the only reason the frame would be dirty would be if it had
// just been inserted or appended
kidReflowState.reason = eReflowReason_Initial;
kidReflowState.reflowCommand = nsnull;
} else if (isStyleChange) {
kidReflowState.reason = eReflowReason_StyleChange;
kidReflowState.reflowCommand = nsnull;
}
// Reflow the frame
ReflowChild(kidFrame, aPresContext, kidDesiredSize, kidReflowState,
kidReflowState.mComputedMargin.left, kidReflowState.mComputedMargin.top,
0, aStatus);
// The document element's background should cover the entire canvas, so
// take into account the combined area and any space taken up by
// absolutely positioned elements
nsMargin border;
nsFrameState kidState;
if (!kidReflowState.mStyleBorder->GetBorder(border)) {
NS_NOTYETIMPLEMENTED("percentage border");
}
kidFrame->GetFrameState(&kidState);
// First check the combined area
if (NS_FRAME_OUTSIDE_CHILDREN & kidState) {
// The background covers the content area and padding area, so check
// for children sticking outside the child frame's padding edge
nscoord paddingEdgeX = kidDesiredSize.width - border.right;
nscoord paddingEdgeY = kidDesiredSize.height - border.bottom;
if (kidDesiredSize.mOverflowArea.XMost() > paddingEdgeX) {
kidDesiredSize.width = kidDesiredSize.mOverflowArea.XMost() +
border.right;
}
if (kidDesiredSize.mOverflowArea.YMost() > paddingEdgeY) {
kidDesiredSize.height = kidDesiredSize.mOverflowArea.YMost() +
border.bottom;
}
}
// If our height is fixed, then make sure the child frame plus its top and
// bottom margin is at least that high as well...
if (NS_AUTOHEIGHT != aReflowState.mComputedHeight) {
nscoord totalHeight = kidDesiredSize.height + kidReflowState.mComputedMargin.top +
kidReflowState.mComputedMargin.bottom;
if (totalHeight < aReflowState.mComputedHeight) {
kidDesiredSize.height += aReflowState.mComputedHeight - totalHeight;
}
}
// Complete the reflow and position and size the child frame
nsRect rect(kidReflowState.mComputedMargin.left, kidReflowState.mComputedMargin.top,
kidDesiredSize.width, kidDesiredSize.height);
FinishReflowChild(kidFrame, aPresContext, kidDesiredSize, rect.x, rect.y, 0);
// If the child frame was just inserted, then we're responsible for making sure
// it repaints
if (isDirtyChildReflow) {
// Damage the area occupied by the deleted frame
Invalidate(aPresContext, rect, PR_FALSE);
}
// Return our desired size
aDesiredSize.width = kidDesiredSize.width + kidReflowState.mComputedMargin.left +
kidReflowState.mComputedMargin.right;
aDesiredSize.height = kidDesiredSize.height + kidReflowState.mComputedMargin.top +
kidReflowState.mComputedMargin.bottom;
aDesiredSize.ascent = aDesiredSize.height;
aDesiredSize.descent = 0;
// XXX Don't completely ignore NS_FRAME_OUTSIDE_CHILDREN for child frames
// that stick out on the left or top edges...
}
NS_FRAME_TRACE_REFLOW_OUT("CanvasFrame::Reflow", aStatus);
return NS_OK;
}
PRIntn
CanvasFrame::GetSkipSides() const
{
return 0;
}
NS_IMETHODIMP
CanvasFrame::HandleEvent(nsIPresContext* aPresContext,
nsGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
NS_ENSURE_ARG_POINTER(aEventStatus);
if (nsEventStatus_eConsumeNoDefault == *aEventStatus) {
return NS_OK;
}
if (aEvent->message == NS_MOUSE_LEFT_BUTTON_UP ||
aEvent->message == NS_MOUSE_MIDDLE_BUTTON_UP ||
aEvent->message == NS_MOUSE_RIGHT_BUTTON_UP ||
aEvent->message == NS_MOUSE_MOVE ) {
nsIFrame *firstChild;
nsresult rv = FirstChild(aPresContext,nsnull,&firstChild);
//canvas frame needs to pass mouse events to its area frame so that mouse movement
//and selection code will work properly. this will still have the necessary effects
//that would have happened if nsFrame::HandleEvent was called.
if (NS_SUCCEEDED(rv) && firstChild)
firstChild->HandleEvent(aPresContext, aEvent, aEventStatus);
else
nsFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
return NS_OK;
}
NS_IMETHODIMP
CanvasFrame::GetFrameForPoint(nsIPresContext* aPresContext,
const nsPoint& aPoint,
nsFramePaintLayer aWhichLayer,
nsIFrame** aFrame)
{
// this should act like a block, so we need to override
return GetFrameForPointUsing(aPresContext, aPoint, nsnull, aWhichLayer, (aWhichLayer == NS_FRAME_PAINT_LAYER_BACKGROUND), aFrame);
}
NS_IMETHODIMP
CanvasFrame::GetFrameType(nsIAtom** aType) const
{
NS_PRECONDITION(nsnull != aType, "null OUT parameter pointer");
*aType = nsLayoutAtoms::canvasFrame;
NS_ADDREF(*aType);
return NS_OK;
}
NS_IMETHODIMP
CanvasFrame::AttributeChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aHint)
{
// if the background color or image is changing, invalidate the canvas
if (aHint > 0){
if (aAttribute == nsHTMLAtoms::bgcolor ||
aAttribute == nsHTMLAtoms::background) {
Invalidate(aPresContext,mRect,PR_FALSE);
}
}
return NS_OK;
}
NS_IMETHODIMP
CanvasFrame::GetContentForEvent(nsIPresContext* 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(nsString& aResult) const
{
return MakeFrameName("Canvas", aResult);
}
NS_IMETHODIMP
CanvasFrame::SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const
{
if (!aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = sizeof(*this);
return NS_OK;
}
#endif
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