gecko-dev/layout/generic/nsAbsoluteContainingBlock.h

138 lines
6.3 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
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*
* Software distributed under the License is distributed on an "AS IS" basis,
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* 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 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
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* ***** END LICENSE BLOCK ***** */
#ifndef nsAbsoluteContainingBlock_h___
#define nsAbsoluteContainingBlock_h___
#include "nsFrameList.h"
#include "nsHTMLReflowState.h"
class nsIAtom;
class nsIFrame;
class nsIPresContext;
/**
* This class contains the logic for being an absolute containing block.
*
* There is no principal child list, just a named child list which contains
* the absolutely positioned frames
*
* All functions include as the first argument the frame that is delegating
* the request
*
* @see nsLayoutAtoms::absoluteList
*/
class nsAbsoluteContainingBlock
{
public:
nsresult FirstChild(const nsIFrame* aDelegatingFrame,
nsIAtom* aListName,
nsIFrame** aFirstChild) const;
nsresult SetInitialChildList(nsIFrame* aDelegatingFrame,
nsIPresContext* aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList);
nsresult AppendFrames(nsIFrame* aDelegatingFrame,
nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aFrameList);
nsresult InsertFrames(nsIFrame* aDelegatingFrame,
nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList);
nsresult RemoveFrame(nsIFrame* aDelegatingFrame,
nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame);
// Called by the delegating frame after it has done its reflow first. This
// function will reflow any absolutely positioned child frames that need to
// be reflowed, e.g., because the absolutely positioned child frame has
// 'auto' for an offset, or a percentage based width or height.
// Returns (in the local coordinate space) the bounding rect of the absolutely
// positioned child elements taking into account their overflow area (if it
// is visible)
nsresult Reflow(nsIFrame* aDelegatingFrame,
nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nscoord aContainingBlockWidth,
nscoord aContainingBlockHeight,
nsRect& aChildBounds);
// Called only for a reflow reason of eReflowReason_Incremental. The
// aWasHandled return value indicates whether the reflow command was
// handled (i.e., the reflow command involved an absolutely positioned
// child element), or whether the caller should handle it.
// Returns (in the local coordinate space) the bounding rect of the absolutely
// positioned child elements taking into account their overflow area (if it
// is visible). This is only set if the reflow command was handled
nsresult IncrementalReflow(nsIFrame* aDelegatingFrame,
nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nscoord aContainingBlockWidth,
nscoord aContainingBlockHeight,
PRBool& aWasHandled,
nsRect& aChildBounds);
void DestroyFrames(nsIFrame* aDelegatingFrame,
nsIPresContext* aPresContext);
PRBool HasAbsoluteFrames() {return mAbsoluteFrames.NotEmpty();}
protected:
nsresult ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame,
nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nscoord aContainingBlockWidth,
nscoord aContainingBlockHeight,
nsIFrame* aKidFrame,
nsReflowReason aReason,
nsReflowStatus& aStatus);
void CalculateChildBounds(nsIPresContext* aPresContext, nsRect& aChildBounds);
protected:
nsFrameList mAbsoluteFrames; // additional named child list
};
#endif /* nsnsAbsoluteContainingBlock_h___ */