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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 -*- */
/* ***** 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 "nsIDocument.h"
#include "nsReflowPath.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsViewsCID.h"
#include "nsIView.h"
#include "nsIViewManager.h"
#include "nsIWidget.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 "nsLayoutAtoms.h"
#include "nsIPresShell.h"
#include "nsIScrollPositionListener.h"
#include "nsDisplayList.h"
// for focus
#include "nsIDOMWindowInternal.h"
#include "nsIFocusController.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(nsStyleContext* aContext)
: nsHTMLContainerFrame(aContext), mDoPaintFocus(PR_FALSE) {}
// nsISupports
NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr);
NS_IMETHOD Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow);
NS_IMETHOD Destroy(nsPresContext* aPresContext);
NS_IMETHOD AppendFrames(nsIAtom* aListName,
nsIFrame* aFrameList);
NS_IMETHOD InsertFrames(nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList);
NS_IMETHOD RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame);
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
virtual PRBool IsContainingBlock() const { return PR_TRUE; }
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);
NS_IMETHOD ScrollPositionDidChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
// nsICanvasFrame
NS_IMETHOD SetHasFocus(PRBool aHasFocus);
/**
* Get the "type" of the frame
*
* @see nsLayoutAtoms::canvasFrame
*/
virtual nsIAtom* GetType() const;
#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;
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);
}
//--------------------------------------------------------------
// 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(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsHTMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
mViewManager = GetPresContext()->GetViewManager();
nsIScrollableView* scrollingView = nsnull;
mViewManager->GetRootScrollableView(&scrollingView);
if (scrollingView) {
scrollingView->AddScrollPositionListener(this);
}
return rv;
}
NS_IMETHODIMP
CanvasFrame::Destroy(nsPresContext* aPresContext)
{
nsIScrollableView* scrollingView = nsnull;
mViewManager->GetRootScrollableView(&scrollingView);
if (scrollingView) {
scrollingView->RemoveScrollPositionListener(this);
}
return nsHTMLContainerFrame::Destroy(aPresContext);
}
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;
nsIViewManager* vm = GetPresContext()->PresShell()->GetViewManager();
if (vm) {
vm->UpdateAllViews(NS_VMREFRESH_NO_SYNC);
}
}
return NS_OK;
}
NS_IMETHODIMP
CanvasFrame::AppendFrames(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
rv = GetPresContext()->PresShell()->
AppendReflowCommand(this, eReflowType_ReflowDirty, nsnull);
}
return rv;
}
NS_IMETHODIMP
CanvasFrame::InsertFrames(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(aListName, aFrameList);
}
return rv;
}
NS_IMETHODIMP
CanvasFrame::RemoveFrame(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
// The child of the canvas probably can't have an outline, but why bother
// thinking about that?
Invalidate(aOldFrame->GetOverflowRect() + aOldFrame->GetPosition(), PR_FALSE);
// Remove the frame and destroy it
mFrames.DestroyFrame(GetPresContext(), aOldFrame);
// Generate a reflow command so we get reflowed
rv = GetPresContext()->PresShell()->
AppendReflowCommand(this, eReflowType_ReflowDirty, nsnull);
} else {
rv = NS_ERROR_FAILURE;
}
return rv;
}
nsRect CanvasFrame::CanvasArea() const
{
nsRect result(GetOverflowRect());
nsIScrollableFrame *scrollableFrame;
CallQueryInterface(GetParent(), &scrollableFrame);
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 = NS_STATIC_CAST(CanvasFrame*, mFrame);
return frame->CanvasArea() + aBuilder->ToReferenceFrame(mFrame);
}
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsIRenderingContext* aCtx, const nsRect& aDirtyRect)
{
CanvasFrame* frame = NS_STATIC_CAST(CanvasFrame*, mFrame);
nsPoint offset = aBuilder->ToReferenceFrame(mFrame);
nsRect bgClipRect = frame->CanvasArea() + offset;
nsCSSRendering::PaintBackground(mFrame->GetPresContext(), *aCtx, mFrame,
aDirtyRect,
nsRect(offset, mFrame->GetSize()),
*mFrame->GetStyleBorder(),
*mFrame->GetStylePadding(),
mFrame->HonorPrintBackgroundSettings(),
&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 = NS_STATIC_CAST(CanvasFrame*, mFrame);
return frame->CanvasArea() + aBuilder->ToReferenceFrame(mFrame);
}
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsIRenderingContext* aCtx, const nsRect& aDirtyRect)
{
CanvasFrame* frame = NS_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;
// 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 = GetFirstChild(nsnull);
if (kid) {
// 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;
CallQueryInterface(GetParent(), &scrollableFrame);
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;
}
nsStyleOutline outlineStyle(GetPresContext());
outlineStyle.SetOutlineStyle(NS_STYLE_BORDER_STYLE_DOTTED);
outlineStyle.SetOutlineInvert();
float p2t = GetPresContext()->PixelsToTwips();
// XXX the CSS border for links is specified as 2px, but it
// is only drawn as 1px. Match this here.
nscoord onePixel = NSIntPixelsToTwips(1, p2t);
nsRect borderInside(focusRect.x + onePixel,
focusRect.y + onePixel,
focusRect.width - 2 * onePixel,
focusRect.height - 2 * onePixel);
nsCSSRendering::DrawDashedSides(0, aRenderingContext,
focusRect, nsnull,
nsnull, &outlineStyle,
PR_TRUE, focusRect,
borderInside, 0,
nsnull);
}
NS_IMETHODIMP
CanvasFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("CanvasFrame", aReflowState.reason);
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
NS_FRAME_TRACE_REFLOW_IN("CanvasFrame::Reflow");
//NS_PRECONDITION(!aDesiredSize.mComputeMEW, "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
nsHTMLReflowCommand *command = aReflowState.path->mReflowCommand;
if (command) {
// Get the reflow type
switch (command->Type()) {
case eReflowType_ReflowDirty:
isDirtyChildReflow = PR_TRUE;
break;
case eReflowType_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 {
#ifdef DEBUG
nsReflowPath::iterator iter = aReflowState.path->FirstChild();
NS_ASSERTION(*iter == mFrames.FirstChild(), "unexpected next reflow command frame");
#endif
}
}
// 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();
nsReflowReason reason;
if (isDirtyChildReflow) {
// Note: the only reason the frame would be dirty would be if it had
// just been inserted or appended
reason = eReflowReason_Initial;
} else if (isStyleChange) {
reason = eReflowReason_StyleChange;
} else {
reason = aReflowState.reason;
}
// 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),
reason);
// Reflow the frame
ReflowChild(kidFrame, aPresContext, kidDesiredSize, kidReflowState,
kidReflowState.mComputedMargin.left, kidReflowState.mComputedMargin.top,
0, aStatus);
// Complete the reflow and position and size the child frame
FinishReflowChild(kidFrame, aPresContext, &kidReflowState, kidDesiredSize,
kidReflowState.mComputedMargin.left,
kidReflowState.mComputedMargin.top, 0);
// If the child frame was just inserted, then we're responsible for making sure
// it repaints
if (isDirtyChildReflow) {
// 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.
Invalidate(GetRect(), PR_FALSE);
}
// Return our desired size (which doesn't matter)
aDesiredSize.width = aReflowState.availableWidth;
aDesiredSize.height = kidDesiredSize.height +
kidReflowState.mComputedMargin.TopBottom();
aDesiredSize.mOverflowArea.UnionRect(
nsRect(0, 0, aDesiredSize.width, aDesiredSize.height),
kidDesiredSize.mOverflowArea +
nsPoint(kidReflowState.mComputedMargin.left,
kidReflowState.mComputedMargin.top));
FinishAndStoreOverflow(&aDesiredSize);
aDesiredSize.ascent = aDesiredSize.height;
aDesiredSize.descent = 0;
}
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 nsLayoutAtoms::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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