зеркало из https://github.com/mozilla/gecko-dev.git
64 строки
2.2 KiB
C++
64 строки
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//
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// Eric Vaughan
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// Netscape Communications
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//
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// See documentation in associated header file
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//
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#include "nsStackFrame.h"
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#include "nsStyleContext.h"
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#include "nsIContent.h"
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#include "nsCOMPtr.h"
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#include "nsHTMLParts.h"
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#include "nsIPresShell.h"
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#include "nsCSSRendering.h"
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#include "nsBoxLayoutState.h"
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#include "nsStackLayout.h"
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#include "nsDisplayList.h"
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nsIFrame*
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NS_NewStackFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsStackFrame(aPresShell, aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsStackFrame)
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nsStackFrame::nsStackFrame(nsIPresShell* aPresShell, nsStyleContext* aContext):
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nsBoxFrame(aPresShell, aContext)
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{
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nsCOMPtr<nsBoxLayout> layout;
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NS_NewStackLayout(aPresShell, layout);
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SetLayoutManager(layout);
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}
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// REVIEW: The old code put everything in the background layer. To be more
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// consistent with the way other frames work, I'm putting everything in the
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// Content() (i.e., foreground) layer (see nsFrame::BuildDisplayListForChild,
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// the case for stacking context but non-positioned, non-floating frames).
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// This could easily be changed back by hacking nsBoxFrame::BuildDisplayListInternal
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// a bit more.
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void
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nsStackFrame::BuildDisplayListForChildren(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists)
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{
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// BuildDisplayListForChild puts stacking contexts into the PositionedDescendants
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// list. So we need to map that list to aLists.Content(). This is an easy way to
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// do that.
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nsDisplayList* content = aLists.Content();
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nsDisplayListSet kidLists(content, content, content, content, content, content);
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nsIFrame* kid = mFrames.FirstChild();
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while (kid) {
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// Force each child into its own true stacking context.
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BuildDisplayListForChild(aBuilder, kid, aDirtyRect, kidLists,
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DISPLAY_CHILD_FORCE_STACKING_CONTEXT);
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kid = kid->GetNextSibling();
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}
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}
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