gecko-dev/layout/generic/nsAbsoluteContainingBlock.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef nsAbsoluteContainingBlock_h___
#define nsAbsoluteContainingBlock_h___
#include "nslayout.h"
#include "nsIHTMLReflow.h"
#include "nsFrameList.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
nsresult Reflow(nsIFrame* aDelegatingFrame,
nsIPresContext& aPresContext,
const nsHTMLReflowState& aReflowState);
// 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
nsresult IncrementalReflow(nsIFrame* aDelegatingFrame,
nsIPresContext& aPresContext,
const nsHTMLReflowState& aReflowState,
PRBool& aWasHandled);
void DestroyFrames(nsIFrame* aDelegatingFrame,
nsIPresContext& aPresContext);
nsresult GetPositionedInfo(const nsIFrame* aDelegatingFrame,
nscoord& aXMost,
nscoord& aYMost) const;
protected:
nsresult ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame,
nsIPresContext& aPresContext,
const nsHTMLReflowState& aReflowState,
nsIFrame* aKidFrame,
PRBool aInitialReflow,
nsReflowStatus& aStatus);
protected:
nsFrameList mAbsoluteFrames; // additional named child list
};
#endif /* nsnsAbsoluteContainingBlock_h___ */