зеркало из https://github.com/mozilla/gecko-dev.git
123 строки
5.3 KiB
C++
123 строки
5.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#ifndef nsAbsoluteContainingBlock_h___
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#define nsAbsoluteContainingBlock_h___
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#include "nslayout.h"
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#include "nsFrameList.h"
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class nsIAtom;
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class nsIFrame;
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class nsIPresContext;
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/**
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* This class contains the logic for being an absolute containing block.
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*
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* There is no principal child list, just a named child list which contains
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* the absolutely positioned frames
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*
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* All functions include as the first argument the frame that is delegating
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* the request
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*
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* @see nsLayoutAtoms::absoluteList
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*/
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class nsAbsoluteContainingBlock
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{
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public:
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nsresult FirstChild(const nsIFrame* aDelegatingFrame,
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nsIAtom* aListName,
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nsIFrame** aFirstChild) const;
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nsresult SetInitialChildList(nsIFrame* aDelegatingFrame,
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nsIPresContext* aPresContext,
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nsIAtom* aListName,
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nsIFrame* aChildList);
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nsresult AppendFrames(nsIFrame* aDelegatingFrame,
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nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aFrameList);
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nsresult InsertFrames(nsIFrame* aDelegatingFrame,
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nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsIFrame* aFrameList);
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nsresult RemoveFrame(nsIFrame* aDelegatingFrame,
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nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aOldFrame);
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// Called by the delegating frame after it has done its reflow first. This
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// function will reflow any absolutely positioned child frames that need to
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// be reflowed, e.g., because the absolutely positioned child frame has
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// 'auto' for an offset, or a percentage based width or height.
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// Returns (in the local coordinate space) the bounding rect of the absolutely
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// positioned child elements taking into account their overflow area (if it
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// is visible)
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nsresult Reflow(nsIFrame* aDelegatingFrame,
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nsIPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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nsRect& aChildBounds);
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// Called only for a reflow reason of eReflowReason_Incremental. The
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// aWasHandled return value indicates whether the reflow command was
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// handled (i.e., the reflow command involved an absolutely positioned
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// child element), or whether the caller should handle it.
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// Returns (in the local coordinate space) the bounding rect of the absolutely
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// positioned child elements taking into account their overflow area (if it
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// is visible). This is only set if the reflow command was handled
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nsresult IncrementalReflow(nsIFrame* aDelegatingFrame,
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nsIPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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PRBool& aWasHandled,
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nsRect& aChildBounds);
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void DestroyFrames(nsIFrame* aDelegatingFrame,
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nsIPresContext* aPresContext);
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PRBool HasAbsoluteFrames() {return mAbsoluteFrames.NotEmpty();}
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protected:
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nsresult ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame,
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nsIPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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nsIFrame* aKidFrame,
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nsReflowReason aReason,
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nsReflowStatus& aStatus);
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void CalculateChildBounds(nsIPresContext* aPresContext, nsRect& aChildBounds);
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protected:
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nsFrameList mAbsoluteFrames; // additional named child list
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};
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#endif /* nsnsAbsoluteContainingBlock_h___ */
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