зеркало из https://github.com/mozilla/pjs.git
145 строки
5.9 KiB
C++
145 строки
5.9 KiB
C++
/* -*- 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):
|
|
*
|
|
* 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 ***** */
|
|
|
|
/*
|
|
* code for managing absolutely positioned children of a rendering
|
|
* object that is a containing block for them
|
|
*/
|
|
|
|
#ifndef nsAbsoluteContainingBlock_h___
|
|
#define nsAbsoluteContainingBlock_h___
|
|
|
|
#include "nsFrameList.h"
|
|
#include "nsHTMLReflowState.h"
|
|
#include "nsGkAtoms.h"
|
|
|
|
class nsIAtom;
|
|
class nsIFrame;
|
|
class nsPresContext;
|
|
|
|
/**
|
|
* 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 nsGkAtoms::absoluteList
|
|
*/
|
|
class nsAbsoluteContainingBlock
|
|
{
|
|
public:
|
|
nsAbsoluteContainingBlock() { } // useful for debugging
|
|
|
|
virtual ~nsAbsoluteContainingBlock() { } // useful for debugging
|
|
|
|
virtual nsIAtom* GetChildListName() const { return nsGkAtoms::absoluteList; }
|
|
|
|
nsresult FirstChild(const nsIFrame* aDelegatingFrame,
|
|
nsIAtom* aListName,
|
|
nsIFrame** aFirstChild) const;
|
|
nsIFrame* GetFirstChild() { return mAbsoluteFrames.FirstChild(); }
|
|
|
|
nsresult SetInitialChildList(nsIFrame* aDelegatingFrame,
|
|
nsIAtom* aListName,
|
|
nsIFrame* aChildList);
|
|
nsresult AppendFrames(nsIFrame* aDelegatingFrame,
|
|
nsIAtom* aListName,
|
|
nsIFrame* aFrameList);
|
|
nsresult InsertFrames(nsIFrame* aDelegatingFrame,
|
|
nsIAtom* aListName,
|
|
nsIFrame* aPrevFrame,
|
|
nsIFrame* aFrameList);
|
|
nsresult RemoveFrame(nsIFrame* aDelegatingFrame,
|
|
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.
|
|
// If aChildBounds is set, 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).
|
|
// @param aForceReflow if this is false, reflow for some absolutely
|
|
// positioned frames may be skipped based on whether they use
|
|
// placeholders for positioning and on whether the containing block
|
|
// width or height changed.
|
|
nsresult Reflow(nsIFrame* aDelegatingFrame,
|
|
nsPresContext* aPresContext,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
PRBool aCBWidthChanged,
|
|
PRBool aCBHeightChanged,
|
|
nsRect* aChildBounds = nsnull);
|
|
|
|
|
|
void DestroyFrames(nsIFrame* aDelegatingFrame);
|
|
|
|
PRBool HasAbsoluteFrames() {return mAbsoluteFrames.NotEmpty();}
|
|
|
|
protected:
|
|
// Returns PR_TRUE if the position of f depends on the position of
|
|
// its placeholder or if the position or size of f depends on a
|
|
// containing block dimension that changed.
|
|
PRBool FrameDependsOnContainer(nsIFrame* f, PRBool aCBWidthChanged,
|
|
PRBool aCBHeightChanged);
|
|
|
|
nsresult ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame,
|
|
nsPresContext* aPresContext,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
nsIFrame* aKidFrame,
|
|
nsReflowStatus& aStatus);
|
|
|
|
protected:
|
|
nsFrameList mAbsoluteFrames; // additional named child list
|
|
|
|
#ifdef DEBUG
|
|
// helper routine for debug printout
|
|
void PrettyUC(nscoord aSize,
|
|
char* aBuf);
|
|
#endif
|
|
};
|
|
|
|
#endif /* nsnsAbsoluteContainingBlock_h___ */
|
|
|