/* -*- 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 * * 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 "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); virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder); NS_DISPLAY_DECL_NAME("TextDecoration") private: nsLineBox* mLine; nscolor mColor; PRUint8 mDecoration; }; void nsDisplayTextDecoration::Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx) { nsCOMPtr fm; nsLayoutUtils::GetFontMetricsForFrame(mFrame, getter_AddRefs(fm)); nsIThebesFontMetrics* tfm = static_cast(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(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(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 nsPoint& 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); virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder); NS_DISPLAY_DECL_NAME("TextShadow") private: nsLineBox* mLine; nscolor mColor; PRUint8 mDecorationFlags; nscoord mBlurRadius; nsPoint mOffset; }; void nsDisplayTextShadow::Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx) { mBlurRadius = NS_MAX(mBlurRadius, 0); nsCOMPtr fm; nsLayoutUtils::GetFontMetricsForFrame(mFrame, getter_AddRefs(fm)); nsIThebesFontMetrics* tfm = static_cast(fm.get()); gfxFontGroup* fontGroup = tfm->GetThebesFontGroup(); gfxFont* firstFont = fontGroup->GetFontAt(0); if (!firstFont) return; // OOM const gfxFont::Metrics& metrics = firstFont->GetMetrics(); gfxFloat underlineOffset = fontGroup->GetUnderlineOffset(); nsHTMLContainerFrame* f = static_cast(mFrame); nsPoint pt = aBuilder->ToReferenceFrame(mFrame) + mOffset; nsPresContext* presContext = mFrame->PresContext(); gfxFloat lineWidth; nsPoint linePt; gfxFloat ascent; if (mLine) { // Block frames give us an nsLineBox, so we must use that nscoord start = mLine->mBounds.x; nscoord width = mLine->mBounds.width; f->AdjustForTextIndent(mLine, start, width); if (width <= 0) return; lineWidth = presContext->AppUnitsToGfxUnits(width); linePt = nsPoint(start + pt.x, mLine->mBounds.y + pt.y); ascent = presContext->AppUnitsToGfxUnits(mLine->GetAscent()); } else { // For inline frames, we must use the frame's geometry nsRect contentRect = mFrame->GetContentRect() - mFrame->GetPosition() + pt; lineWidth = presContext->AppUnitsToGfxUnits(contentRect.width); linePt = contentRect.TopLeft(); // The ascent of :first-letter frame's text may not be the same as the ascent // of the font metrics, because it 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 those will be added in PaintTextDecorationLine. nsFirstLetterFrame* letterFrame = static_cast(mFrame); nscoord tmp = letterFrame->GetFirstLetterBaseline(); tmp -= letterFrame->GetUsedBorderAndPadding().top; ascent = presContext->AppUnitsToGfxUnits(tmp); } else { ascent = metrics.maxAscent; } } gfxContext* thebesCtx = aCtx->ThebesContext(); nsRect shadowRect(0, 0, 0, 0); // Get the rects for each text decoration line, and union them together so we // know the minimum size we can make our shadow-painting surface. if (mDecorationFlags & NS_STYLE_TEXT_DECORATION_UNDERLINE) { gfxSize size(lineWidth, metrics.underlineSize); nsRect rect = nsCSSRendering::GetTextDecorationRect(presContext, size, ascent, underlineOffset, NS_STYLE_TEXT_DECORATION_UNDERLINE, nsCSSRendering::DECORATION_STYLE_SOLID); shadowRect.UnionRect(shadowRect, rect + linePt); } if (mDecorationFlags & NS_STYLE_TEXT_DECORATION_OVERLINE) { gfxSize size(lineWidth, metrics.underlineSize); nsRect rect = nsCSSRendering::GetTextDecorationRect(presContext, size, ascent, metrics.maxAscent, NS_STYLE_TEXT_DECORATION_OVERLINE, nsCSSRendering::DECORATION_STYLE_SOLID); shadowRect.UnionRect(shadowRect, rect + linePt); } if (mDecorationFlags & NS_STYLE_TEXT_DECORATION_LINE_THROUGH) { gfxSize size(lineWidth, metrics.strikeoutSize); nsRect rect = nsCSSRendering::GetTextDecorationRect(presContext, size, ascent, metrics.strikeoutOffset, NS_STYLE_TEXT_DECORATION_LINE_THROUGH, nsCSSRendering::DECORATION_STYLE_SOLID); shadowRect.UnionRect(shadowRect, rect + linePt); } // Create our shadow surface, then paint the text decorations onto it nsContextBoxBlur contextBoxBlur; gfxContext* shadowCtx = contextBoxBlur.Init(shadowRect, mBlurRadius, presContext->AppUnitsPerDevPixel(), thebesCtx, mVisibleRect); if (!shadowCtx) return; thebesCtx->Save(); thebesCtx->NewPath(); thebesCtx->SetColor(gfxRGBA(mColor)); if (mDecorationFlags & NS_STYLE_TEXT_DECORATION_UNDERLINE) { f->PaintTextDecorationLine(shadowCtx, pt, mLine, mColor, underlineOffset, ascent, metrics.underlineSize, NS_STYLE_TEXT_DECORATION_UNDERLINE); } if (mDecorationFlags & NS_STYLE_TEXT_DECORATION_OVERLINE) { f->PaintTextDecorationLine(shadowCtx, pt, mLine, mColor, metrics.maxAscent, ascent, metrics.underlineSize, NS_STYLE_TEXT_DECORATION_OVERLINE); } if (mDecorationFlags & NS_STYLE_TEXT_DECORATION_LINE_THROUGH) { f->PaintTextDecorationLine(shadowCtx, pt, mLine, mColor, metrics.strikeoutOffset, ascent, 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; nsPoint offset(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); } /*virtual*/ void nsHTMLContainerFrame::AdjustForTextIndent(const nsLineBox* aLine, nscoord& start, nscoord& width) { // This function is not for us. // It allows nsBlockFrame to adjust the width/X position of its // shadowed decorations if a text-indent rule is in effect. } 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 if and only if a new frame is * created; otherwise nsnull is returned in aNextInFlowResult. */ nsresult nsHTMLContainerFrame::CreateNextInFlow(nsPresContext* aPresContext, nsIFrame* aFrame, nsIFrame*& aNextInFlowResult) { NS_PRECONDITION(GetType() != nsGkAtoms::blockFrame, "you should have called nsBlockFrame::CreateContinuationFor instead"); NS_PRECONDITION(mFrames.ContainsFrame(aFrame), "expected an in-flow child frame"); aNextInFlowResult = nsnull; nsIFrame* nextInFlow = aFrame->GetNextInFlow(); if (nsnull == nextInFlow) { // Create a continuation frame for the child frame and insert it // into our child list. nsresult rv = aPresContext->PresShell()->FrameConstructor()-> CreateContinuingFrame(aPresContext, aFrame, this, &nextInFlow); if (NS_FAILED(rv)) { return rv; } mFrames.InsertFrame(nsnull, aFrame, nextInFlow); 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()) { #ifdef MOZ_XUL if (aFrame->GetType() == nsGkAtoms::menuPopupFrame) { // This view must be parented by the root view, don't reparent it. return NS_OK; } #endif 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, const nsFrameList& aChildFrameList, nsIFrame* aOldParentFrame, nsIFrame* aNewParentFrame) { NS_PRECONDITION(aChildFrameList.NotEmpty(), "empty 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 (nsFrameList::Enumerator e(aChildFrameList); !e.AtEnd(); e.Next()) { ReparentFrameViewTo(e.get(), 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 && !aFrame->NeedsView()) { // don't need a view return NS_OK; } nsIView* parentView = aFrame->GetParent()->GetClosestView(); 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); 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; } NS_IMPL_FRAMEARENA_HELPERS(nsHTMLContainerFrame)