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pjs/layout/generic/nsHTMLContainerFrame.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):
* Michael Ventnor <m.ventnor@gmail.com>
*
* 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 ***** */
/* base class #2 for rendering objects that have child lists */
#include "nsHTMLContainerFrame.h"
#include "nsFirstLetterFrame.h"
#include "nsIRenderingContext.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIContent.h"
#include "nsGkAtoms.h"
#include "nsLayoutUtils.h"
#include "nsCSSAnonBoxes.h"
#include "nsILinkHandler.h"
#include "nsGUIEvent.h"
#include "nsIDocument.h"
#include "nsIURL.h"
#include "nsPlaceholderFrame.h"
#include "nsHTMLParts.h"
#include "nsIView.h"
#include "nsIViewManager.h"
#include "nsIDOMEvent.h"
#include "nsIScrollableView.h"
#include "nsWidgetsCID.h"
#include "nsCOMPtr.h"
#include "nsIDeviceContext.h"
#include "nsIFontMetrics.h"
#include "nsIThebesFontMetrics.h"
#include "gfxFont.h"
#include "nsCSSFrameConstructor.h"
#include "nsDisplayList.h"
#include "nsBlockFrame.h"
#include "nsLineBox.h"
#include "nsDisplayList.h"
#include "nsCSSRendering.h"
class nsDisplayTextDecoration : public nsDisplayItem {
public:
nsDisplayTextDecoration(nsHTMLContainerFrame* aFrame, PRUint8 aDecoration,
nscolor aColor, nsLineBox* aLine)
: nsDisplayItem(aFrame), mLine(aLine), mColor(aColor),
mDecoration(aDecoration) {
MOZ_COUNT_CTOR(nsDisplayTextDecoration);
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplayTextDecoration() {
MOZ_COUNT_DTOR(nsDisplayTextDecoration);
}
#endif
virtual void Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx,
const nsRect& aDirtyRect);
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder);
NS_DISPLAY_DECL_NAME("TextDecoration")
private:
nsLineBox* mLine;
nscolor mColor;
PRUint8 mDecoration;
};
void
nsDisplayTextDecoration::Paint(nsDisplayListBuilder* aBuilder,
nsIRenderingContext* aCtx,
const nsRect& aDirtyRect)
{
nsCOMPtr<nsIFontMetrics> fm;
nsLayoutUtils::GetFontMetricsForFrame(mFrame, getter_AddRefs(fm));
nsIThebesFontMetrics* tfm = static_cast<nsIThebesFontMetrics*>(fm.get());
gfxFontGroup* fontGroup = tfm->GetThebesFontGroup();
gfxFont* firstFont = fontGroup->GetFontAt(0);
if (!firstFont)
return; // OOM
const gfxFont::Metrics& metrics = firstFont->GetMetrics();
gfxFloat ascent;
// The ascent of first-letter frame's text may not be the same as the ascent
// of the font metrics. Because that may use the tight box of the actual
// glyph.
if (mFrame->GetType() == nsGkAtoms::letterFrame) {
// Note that nsFirstLetterFrame::GetFirstLetterBaseline() returns
// |border-top + padding-top + ascent|. But we only need the ascent value.
// Because they will be added in PaintTextDecorationLine.
nsFirstLetterFrame* letterFrame = static_cast<nsFirstLetterFrame*>(mFrame);
nscoord tmp = letterFrame->GetFirstLetterBaseline();
tmp -= letterFrame->GetUsedBorderAndPadding().top;
ascent = letterFrame->PresContext()->AppUnitsToGfxUnits(tmp);
} else {
ascent = metrics.maxAscent;
}
nsPoint pt = aBuilder->ToReferenceFrame(mFrame);
nsHTMLContainerFrame* f = static_cast<nsHTMLContainerFrame*>(mFrame);
if (mDecoration == NS_STYLE_TEXT_DECORATION_UNDERLINE) {
gfxFloat underlineOffset = fontGroup->GetUnderlineOffset();
f->PaintTextDecorationLine(aCtx->ThebesContext(), pt, mLine, mColor,
underlineOffset, ascent,
metrics.underlineSize, mDecoration);
} else if (mDecoration == NS_STYLE_TEXT_DECORATION_OVERLINE) {
f->PaintTextDecorationLine(aCtx->ThebesContext(), pt, mLine, mColor,
metrics.maxAscent, ascent,
metrics.underlineSize, mDecoration);
} else {
f->PaintTextDecorationLine(aCtx->ThebesContext(), pt, mLine, mColor,
metrics.strikeoutOffset, ascent,
metrics.strikeoutSize, mDecoration);
}
}
nsRect
nsDisplayTextDecoration::GetBounds(nsDisplayListBuilder* aBuilder)
{
return mFrame->GetOverflowRect() + aBuilder->ToReferenceFrame(mFrame);
}
class nsDisplayTextShadow : public nsDisplayItem {
public:
nsDisplayTextShadow(nsHTMLContainerFrame* aFrame, const PRUint8 aDecoration,
const nscolor& aColor, nsLineBox* aLine,
const nscoord& aBlurRadius, const gfxPoint& aOffset)
: nsDisplayItem(aFrame), mLine(aLine), mColor(aColor),
mDecorationFlags(aDecoration),
mBlurRadius(aBlurRadius), mOffset(aOffset) {
MOZ_COUNT_CTOR(nsDisplayTextShadow);
}
virtual ~nsDisplayTextShadow() {
MOZ_COUNT_DTOR(nsDisplayTextShadow);
}
virtual void Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx,
const nsRect& aDirtyRect);
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder);
NS_DISPLAY_DECL_NAME("TextShadow")
private:
nsLineBox* mLine;
nscolor mColor;
PRUint8 mDecorationFlags;
nscoord mBlurRadius; // App units
gfxPoint mOffset; // App units
};
void
nsDisplayTextShadow::Paint(nsDisplayListBuilder* aBuilder,
nsIRenderingContext* aCtx,
const nsRect& aDirtyRect)
{
mBlurRadius = PR_MAX(mBlurRadius, 0);
nsCOMPtr<nsIFontMetrics> fm;
nsLayoutUtils::GetFontMetricsForFrame(mFrame, getter_AddRefs(fm));
nsIThebesFontMetrics* tfm = static_cast<nsIThebesFontMetrics*>(fm.get());
gfxFontGroup* fontGroup = tfm->GetThebesFontGroup();
gfxFont* firstFont = fontGroup->GetFontAt(0);
if (!firstFont)
return; // OOM
const gfxFont::Metrics& metrics = firstFont->GetMetrics();
nsPoint pt = aBuilder->ToReferenceFrame(mFrame) + nsPoint(mOffset.x, mOffset.y);
nsHTMLContainerFrame* f = static_cast<nsHTMLContainerFrame*>(mFrame);
nsMargin bp = f->GetUsedBorderAndPadding();
nscoord innerWidthInAppUnits = (mFrame->GetSize().width - bp.LeftRight());
gfxRect shadowRect = gfxRect(pt.x, pt.y, innerWidthInAppUnits, mFrame->GetSize().height);
gfxContext* thebesCtx = aCtx->ThebesContext();
gfxRect dirtyRect(aDirtyRect.x, aDirtyRect.y, aDirtyRect.width, aDirtyRect.height);
nsContextBoxBlur contextBoxBlur;
gfxContext* shadowCtx = contextBoxBlur.Init(shadowRect, mBlurRadius,
mFrame->PresContext()->AppUnitsPerDevPixel(),
thebesCtx, dirtyRect);
if (!shadowCtx)
return;
thebesCtx->Save();
thebesCtx->NewPath();
thebesCtx->SetColor(gfxRGBA(mColor));
if (mDecorationFlags & NS_STYLE_TEXT_DECORATION_UNDERLINE) {
gfxFloat underlineOffset = fontGroup->GetUnderlineOffset();
f->PaintTextDecorationLine(shadowCtx, pt, mLine, mColor,
underlineOffset, metrics.maxAscent,
metrics.underlineSize, NS_STYLE_TEXT_DECORATION_UNDERLINE);
}
if (mDecorationFlags & NS_STYLE_TEXT_DECORATION_OVERLINE) {
f->PaintTextDecorationLine(shadowCtx, pt, mLine, mColor,
metrics.maxAscent, metrics.maxAscent,
metrics.underlineSize, NS_STYLE_TEXT_DECORATION_OVERLINE);
}
if (mDecorationFlags & NS_STYLE_TEXT_DECORATION_LINE_THROUGH) {
f->PaintTextDecorationLine(shadowCtx, pt, mLine, mColor,
metrics.strikeoutOffset, metrics.maxAscent,
metrics.strikeoutSize, NS_STYLE_TEXT_DECORATION_LINE_THROUGH);
}
contextBoxBlur.DoPaint();
thebesCtx->Restore();
}
nsRect
nsDisplayTextShadow::GetBounds(nsDisplayListBuilder* aBuilder)
{
// Shadows are always painted in the overflow rect
return mFrame->GetOverflowRect() + aBuilder->ToReferenceFrame(mFrame);
}
nsresult
nsHTMLContainerFrame::DisplayTextDecorations(nsDisplayListBuilder* aBuilder,
nsDisplayList* aBelowTextDecorations,
nsDisplayList* aAboveTextDecorations,
nsLineBox* aLine)
{
if (eCompatibility_NavQuirks == PresContext()->CompatibilityMode())
return NS_OK;
if (!IsVisibleForPainting(aBuilder))
return NS_OK;
// Do standards mode painting of 'text-decoration's: under+overline
// behind children, line-through in front. For Quirks mode, see
// nsTextFrame::PaintTextDecorations. (See bug 1777.)
nscolor underColor, overColor, strikeColor;
PRUint8 decorations = NS_STYLE_TEXT_DECORATION_NONE;
GetTextDecorations(PresContext(), aLine != nsnull, decorations, underColor,
overColor, strikeColor);
if (decorations == NS_STYLE_TEXT_DECORATION_NONE)
return NS_OK;
// The text-shadow spec says that any text decorations must also have a shadow applied to
// it. So draw the shadows as part of the display list.
const nsStyleText* textStyle = GetStyleText();
if (textStyle->mTextShadow) {
for (PRUint32 i = textStyle->mTextShadow->Length(); i > 0; --i) {
nsCSSShadowItem* shadow = textStyle->mTextShadow->ShadowAt(i - 1);
nscoord blurRadius = shadow->mRadius;
nscolor shadowColor;
if (shadow->mHasColor)
shadowColor = shadow->mColor;
else
shadowColor = GetStyleColor()->mColor;
gfxPoint offset = gfxPoint(shadow->mXOffset, shadow->mYOffset);
// Add it to the display list so it is painted underneath the text and all decorations
nsresult rv = aBelowTextDecorations->AppendNewToTop(new (aBuilder)
nsDisplayTextShadow(this, decorations, shadowColor, aLine, blurRadius, offset));
NS_ENSURE_SUCCESS(rv, rv);
}
}
if (decorations & NS_STYLE_TEXT_DECORATION_UNDERLINE) {
nsresult rv = aBelowTextDecorations->AppendNewToTop(new (aBuilder)
nsDisplayTextDecoration(this, NS_STYLE_TEXT_DECORATION_UNDERLINE, underColor, aLine));
NS_ENSURE_SUCCESS(rv, rv);
}
if (decorations & NS_STYLE_TEXT_DECORATION_OVERLINE) {
nsresult rv = aBelowTextDecorations->AppendNewToTop(new (aBuilder)
nsDisplayTextDecoration(this, NS_STYLE_TEXT_DECORATION_OVERLINE, overColor, aLine));
NS_ENSURE_SUCCESS(rv, rv);
}
if (decorations & NS_STYLE_TEXT_DECORATION_LINE_THROUGH) {
nsresult rv = aAboveTextDecorations->AppendNewToTop(new (aBuilder)
nsDisplayTextDecoration(this, NS_STYLE_TEXT_DECORATION_LINE_THROUGH, strikeColor, aLine));
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
nsresult
nsHTMLContainerFrame::DisplayTextDecorationsAndChildren(
nsDisplayListBuilder* aBuilder, const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
nsDisplayList aboveChildrenDecorations;
nsresult rv = DisplayTextDecorations(aBuilder, aLists.Content(),
&aboveChildrenDecorations, nsnull);
NS_ENSURE_SUCCESS(rv, rv);
rv = BuildDisplayListForNonBlockChildren(aBuilder, aDirtyRect, aLists,
DISPLAY_CHILD_INLINE);
NS_ENSURE_SUCCESS(rv, rv);
aLists.Content()->AppendToTop(&aboveChildrenDecorations);
return NS_OK;
}
NS_IMETHODIMP
nsHTMLContainerFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists) {
nsresult rv = DisplayBorderBackgroundOutline(aBuilder, aLists);
NS_ENSURE_SUCCESS(rv, rv);
return DisplayTextDecorationsAndChildren(aBuilder, aDirtyRect, aLists);
}
static PRBool
HasTextFrameDescendantOrInFlow(nsIFrame* aFrame);
/*virtual*/ void
nsHTMLContainerFrame::PaintTextDecorationLine(
gfxContext* aCtx,
const nsPoint& aPt,
nsLineBox* aLine,
nscolor aColor,
gfxFloat aOffset,
gfxFloat aAscent,
gfxFloat aSize,
const PRUint8 aDecoration)
{
NS_ASSERTION(!aLine, "Should not have passed a linebox to a non-block frame");
nsMargin bp = GetUsedBorderAndPadding();
PRIntn skip = GetSkipSides();
NS_FOR_CSS_SIDES(side) {
if (skip & (1 << side)) {
bp.side(side) = 0;
}
}
nscoord innerWidth = mRect.width - bp.left - bp.right;
gfxPoint pt(PresContext()->AppUnitsToGfxUnits(bp.left + aPt.x),
PresContext()->AppUnitsToGfxUnits(bp.top + aPt.y));
gfxSize size(PresContext()->AppUnitsToGfxUnits(innerWidth), aSize);
nsCSSRendering::PaintDecorationLine(aCtx, aColor, pt, size, aAscent, aOffset,
aDecoration, nsCSSRendering::DECORATION_STYLE_SOLID);
}
void
nsHTMLContainerFrame::GetTextDecorations(nsPresContext* aPresContext,
PRBool aIsBlock,
PRUint8& aDecorations,
nscolor& aUnderColor,
nscolor& aOverColor,
nscolor& aStrikeColor)
{
aDecorations = NS_STYLE_TEXT_DECORATION_NONE;
if (!mStyleContext->HasTextDecorations()) {
// This is a necessary, but not sufficient, condition for text
// decorations.
return;
}
// A mask of all possible decorations.
PRUint8 decorMask = NS_STYLE_TEXT_DECORATION_UNDERLINE |
NS_STYLE_TEXT_DECORATION_OVERLINE |
NS_STYLE_TEXT_DECORATION_LINE_THROUGH;
if (!aIsBlock) {
aDecorations = GetStyleTextReset()->mTextDecoration & decorMask;
if (aDecorations) {
const nsStyleColor* styleColor = GetStyleColor();
aUnderColor = styleColor->mColor;
aOverColor = styleColor->mColor;
aStrikeColor = styleColor->mColor;
}
}
else {
// walk tree
for (nsIFrame *frame = this; frame && decorMask; frame = frame->GetParent()) {
// find text-decorations. "Inherit" from parent *block* frames
nsStyleContext* styleContext = frame->GetStyleContext();
const nsStyleDisplay* styleDisplay = styleContext->GetStyleDisplay();
if (!styleDisplay->IsBlockInside() &&
styleDisplay->mDisplay != NS_STYLE_DISPLAY_TABLE_CELL &&
styleDisplay->mDisplay != NS_STYLE_DISPLAY_TABLE_CAPTION) {
// If an inline frame is discovered while walking up the tree,
// we should stop according to CSS3 draft. CSS2 is rather vague
// about this.
break;
}
const nsStyleTextReset* styleText = styleContext->GetStyleTextReset();
PRUint8 decors = decorMask & styleText->mTextDecoration;
if (decors) {
// A *new* text-decoration is found.
nscolor color = styleContext->GetStyleColor()->mColor;
if (NS_STYLE_TEXT_DECORATION_UNDERLINE & decors) {
aUnderColor = color;
decorMask &= ~NS_STYLE_TEXT_DECORATION_UNDERLINE;
aDecorations |= NS_STYLE_TEXT_DECORATION_UNDERLINE;
}
if (NS_STYLE_TEXT_DECORATION_OVERLINE & decors) {
aOverColor = color;
decorMask &= ~NS_STYLE_TEXT_DECORATION_OVERLINE;
aDecorations |= NS_STYLE_TEXT_DECORATION_OVERLINE;
}
if (NS_STYLE_TEXT_DECORATION_LINE_THROUGH & decors) {
aStrikeColor = color;
decorMask &= ~NS_STYLE_TEXT_DECORATION_LINE_THROUGH;
aDecorations |= NS_STYLE_TEXT_DECORATION_LINE_THROUGH;
}
}
}
}
if (aDecorations) {
// If this frame contains no text, we're required to ignore this property
if (!HasTextFrameDescendantOrInFlow(this)) {
aDecorations = NS_STYLE_TEXT_DECORATION_NONE;
}
}
}
static PRBool
HasTextFrameDescendant(nsIFrame* aParent)
{
for (nsIFrame* kid = aParent->GetFirstChild(nsnull); kid;
kid = kid->GetNextSibling())
{
if (kid->GetType() == nsGkAtoms::textFrame) {
// This is only a candidate. We need to determine if this text
// frame is empty, as in containing only (non-pre) whitespace.
// See bug 20163.
if (!kid->IsEmpty()) {
return PR_TRUE;
}
}
if (HasTextFrameDescendant(kid)) {
return PR_TRUE;
}
}
return PR_FALSE;
}
static PRBool
HasTextFrameDescendantOrInFlow(nsIFrame* aFrame)
{
for (nsIFrame *f = aFrame->GetFirstInFlow(); f; f = f->GetNextInFlow()) {
if (HasTextFrameDescendant(f))
return PR_TRUE;
}
return PR_FALSE;
}
/**
* Create a next-in-flow for aFrame. Will return the newly created
* frame in aNextInFlowResult <b>if and only if</b> a new frame is
* created; otherwise nsnull is returned in aNextInFlowResult.
*/
nsresult
nsHTMLContainerFrame::CreateNextInFlow(nsPresContext* aPresContext,
nsIFrame* aOuterFrame,
nsIFrame* aFrame,
nsIFrame*& aNextInFlowResult)
{
aNextInFlowResult = nsnull;
nsIFrame* nextInFlow = aFrame->GetNextInFlow();
if (nsnull == nextInFlow) {
// Create a continuation frame for the child frame and insert it
// into our lines child list.
nsIFrame* nextFrame = aFrame->GetNextSibling();
nsresult rv = aPresContext->PresShell()->FrameConstructor()->
CreateContinuingFrame(aPresContext, aFrame, aOuterFrame, &nextInFlow);
if (NS_FAILED(rv)) {
return rv;
}
aFrame->SetNextSibling(nextInFlow);
nextInFlow->SetNextSibling(nextFrame);
NS_FRAME_LOG(NS_FRAME_TRACE_NEW_FRAMES,
("nsHTMLContainerFrame::CreateNextInFlow: frame=%p nextInFlow=%p",
aFrame, nextInFlow));
aNextInFlowResult = nextInFlow;
}
return NS_OK;
}
static nsresult
ReparentFrameViewTo(nsIFrame* aFrame,
nsIViewManager* aViewManager,
nsIView* aNewParentView,
nsIView* aOldParentView)
{
// XXX What to do about placeholder views for "position: fixed" elements?
// They should be reparented too.
// Does aFrame have a view?
if (aFrame->HasView()) {
nsIView* view = aFrame->GetView();
// Verify that the current parent view is what we think it is
//nsIView* parentView;
//NS_ASSERTION(parentView == aOldParentView, "unexpected parent view");
aViewManager->RemoveChild(view);
// The view will remember the Z-order and other attributes that have been set on it.
nsIView* insertBefore = nsLayoutUtils::FindSiblingViewFor(aNewParentView, aFrame);
aViewManager->InsertChild(aNewParentView, view, insertBefore, insertBefore != nsnull);
} else {
PRInt32 listIndex = 0;
nsIAtom* listName = nsnull;
// This loop iterates through every child list name, and also
// executes once with listName == nsnull.
do {
// Iterate the child frames, and check each child frame to see if it has
// a view
nsIFrame* childFrame = aFrame->GetFirstChild(listName);
for (; childFrame; childFrame = childFrame->GetNextSibling()) {
ReparentFrameViewTo(childFrame, aViewManager,
aNewParentView, aOldParentView);
}
listName = aFrame->GetAdditionalChildListName(listIndex++);
} while (listName);
}
return NS_OK;
}
nsresult
nsHTMLContainerFrame::ReparentFrameView(nsPresContext* aPresContext,
nsIFrame* aChildFrame,
nsIFrame* aOldParentFrame,
nsIFrame* aNewParentFrame)
{
NS_PRECONDITION(aChildFrame, "null child frame pointer");
NS_PRECONDITION(aOldParentFrame, "null old parent frame pointer");
NS_PRECONDITION(aNewParentFrame, "null new parent frame pointer");
NS_PRECONDITION(aOldParentFrame != aNewParentFrame, "same old and new parent frame");
// See if either the old parent frame or the new parent frame have a view
while (!aOldParentFrame->HasView() && !aNewParentFrame->HasView()) {
// Walk up both the old parent frame and the new parent frame nodes
// stopping when we either find a common parent or views for one
// or both of the frames.
//
// This works well in the common case where we push/pull and the old parent
// frame and the new parent frame are part of the same flow. They will
// typically be the same distance (height wise) from the
aOldParentFrame = aOldParentFrame->GetParent();
aNewParentFrame = aNewParentFrame->GetParent();
// We should never walk all the way to the root frame without finding
// a view
NS_ASSERTION(aOldParentFrame && aNewParentFrame, "didn't find view");
// See if we reached a common ancestor
if (aOldParentFrame == aNewParentFrame) {
break;
}
}
// See if we found a common parent frame
if (aOldParentFrame == aNewParentFrame) {
// We found a common parent and there are no views between the old parent
// and the common parent or the new parent frame and the common parent.
// Because neither the old parent frame nor the new parent frame have views,
// then any child views don't need reparenting
return NS_OK;
}
// We found views for one or both of the ancestor frames before we
// found a common ancestor.
nsIView* oldParentView = aOldParentFrame->GetClosestView();
nsIView* newParentView = aNewParentFrame->GetClosestView();
// See if the old parent frame and the new parent frame are in the
// same view sub-hierarchy. If they are then we don't have to do
// anything
if (oldParentView != newParentView) {
// They're not so we need to reparent any child views
return ReparentFrameViewTo(aChildFrame, oldParentView->GetViewManager(), newParentView,
oldParentView);
}
return NS_OK;
}
nsresult
nsHTMLContainerFrame::ReparentFrameViewList(nsPresContext* aPresContext,
nsIFrame* aChildFrameList,
nsIFrame* aOldParentFrame,
nsIFrame* aNewParentFrame)
{
NS_PRECONDITION(aChildFrameList, "null child frame list");
NS_PRECONDITION(aOldParentFrame, "null old parent frame pointer");
NS_PRECONDITION(aNewParentFrame, "null new parent frame pointer");
NS_PRECONDITION(aOldParentFrame != aNewParentFrame, "same old and new parent frame");
// See if either the old parent frame or the new parent frame have a view
while (!aOldParentFrame->HasView() && !aNewParentFrame->HasView()) {
// Walk up both the old parent frame and the new parent frame nodes
// stopping when we either find a common parent or views for one
// or both of the frames.
//
// This works well in the common case where we push/pull and the old parent
// frame and the new parent frame are part of the same flow. They will
// typically be the same distance (height wise) from the
aOldParentFrame = aOldParentFrame->GetParent();
aNewParentFrame = aNewParentFrame->GetParent();
// We should never walk all the way to the root frame without finding
// a view
NS_ASSERTION(aOldParentFrame && aNewParentFrame, "didn't find view");
// See if we reached a common ancestor
if (aOldParentFrame == aNewParentFrame) {
break;
}
}
// See if we found a common parent frame
if (aOldParentFrame == aNewParentFrame) {
// We found a common parent and there are no views between the old parent
// and the common parent or the new parent frame and the common parent.
// Because neither the old parent frame nor the new parent frame have views,
// then any child views don't need reparenting
return NS_OK;
}
// We found views for one or both of the ancestor frames before we
// found a common ancestor.
nsIView* oldParentView = aOldParentFrame->GetClosestView();
nsIView* newParentView = aNewParentFrame->GetClosestView();
// See if the old parent frame and the new parent frame are in the
// same view sub-hierarchy. If they are then we don't have to do
// anything
if (oldParentView != newParentView) {
nsIViewManager* viewManager = oldParentView->GetViewManager();
// They're not so we need to reparent any child views
for (nsIFrame* f = aChildFrameList; f; f = f->GetNextSibling()) {
ReparentFrameViewTo(f, viewManager, newParentView,
oldParentView);
}
}
return NS_OK;
}
nsresult
nsHTMLContainerFrame::CreateViewForFrame(nsIFrame* aFrame,
PRBool aForce)
{
if (aFrame->HasView()) {
return NS_OK;
}
// If we don't yet have a view, see if we need a view
if (!(aForce || FrameNeedsView(aFrame))) {
// don't need a view
return NS_OK;
}
nsIView* parentView = aFrame->GetParent()->GetParentViewForChildFrame(aFrame);
NS_ASSERTION(parentView, "no parent with view");
nsIViewManager* viewManager = parentView->GetViewManager();
NS_ASSERTION(viewManager, "null view manager");
// Create a view
nsIView* view = viewManager->CreateView(aFrame->GetRect(), parentView);
if (!view)
return NS_ERROR_OUT_OF_MEMORY;
SyncFrameViewProperties(aFrame->PresContext(), aFrame, nsnull, view);
// Insert the view into the view hierarchy. If the parent view is a
// scrolling view we need to do this differently
nsIScrollableView* scrollingView = parentView->ToScrollableView();
if (scrollingView) {
scrollingView->SetScrolledView(view);
} else {
nsIView* insertBefore = nsLayoutUtils::FindSiblingViewFor(parentView, aFrame);
// we insert this view 'above' the insertBefore view, unless insertBefore is null,
// in which case we want to call with aAbove == PR_FALSE to insert at the beginning
// in document order
viewManager->InsertChild(parentView, view, insertBefore, insertBefore != nsnull);
}
// REVIEW: Don't create a widget for fixed-pos elements anymore.
// ComputeRepaintRegionForCopy will calculate the right area to repaint
// when we scroll.
// Reparent views on any child frames (or their descendants) to this
// view. We can just call ReparentFrameViewTo on this frame because
// we know this frame has no view, so it will crawl the children. Also,
// we know that any descendants with views must have 'parentView' as their
// parent view.
ReparentFrameViewTo(aFrame, viewManager, view, parentView);
// Remember our view
aFrame->SetView(view);
NS_FRAME_LOG(NS_FRAME_TRACE_CALLS,
("nsHTMLContainerFrame::CreateViewForFrame: frame=%p view=%p",
aFrame));
return NS_OK;
}
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