зеркало из https://github.com/mozilla/pjs.git
174 строки
7.1 KiB
C++
174 строки
7.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* code for managing absolutely positioned children of a rendering
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* object that is a containing block for them
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*/
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#ifndef nsAbsoluteContainingBlock_h___
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#define nsAbsoluteContainingBlock_h___
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#include "nsFrameList.h"
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#include "nsHTMLReflowState.h"
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#include "nsGkAtoms.h"
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#include "nsContainerFrame.h"
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class nsIAtom;
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class nsIFrame;
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class nsPresContext;
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/**
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* This class contains the logic for being an absolute containing block. This
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* class is used within viewport frames (for frames representing content with
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* fixed position) and blocks (for frames representing absolutely positioned
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* content), since each set of frames is absolutely positioned with respect to
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* its parent.
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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 nsGkAtoms::absoluteList and nsGkAtoms::fixedList
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*/
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class nsAbsoluteContainingBlock
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{
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public:
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nsAbsoluteContainingBlock(nsIAtom* aChildListName)
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#ifdef DEBUG
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: mChildListName(aChildListName)
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#endif
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{
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NS_ASSERTION(mChildListName == nsGkAtoms::absoluteList ||
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mChildListName == nsGkAtoms::fixedList,
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"should either represent position:fixed or absolute content");
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}
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#ifdef DEBUG
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nsIAtom* GetChildListName() const { return mChildListName; }
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#endif
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const nsFrameList& GetChildList() const { return mAbsoluteFrames; }
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nsresult SetInitialChildList(nsIFrame* aDelegatingFrame,
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nsIAtom* aListName,
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nsFrameList& aChildList);
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nsresult AppendFrames(nsIFrame* aDelegatingFrame,
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nsIAtom* aListName,
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nsFrameList& aFrameList);
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nsresult InsertFrames(nsIFrame* aDelegatingFrame,
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nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsFrameList& aFrameList);
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void RemoveFrame(nsIFrame* aDelegatingFrame,
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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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// If aChildBounds is set, it returns (in the local coordinate space) the
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// bounding rect of the absolutely positioned child elements taking into
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// account their overflow area (if it is visible).
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// @param aForceReflow if this is false, reflow for some absolutely
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// positioned frames may be skipped based on whether they use
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// placeholders for positioning and on whether the containing block
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// width or height changed.
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nsresult Reflow(nsContainerFrame* aDelegatingFrame,
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nsPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aReflowStatus,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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PRBool aConstrainHeight,
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PRBool aCBWidthChanged,
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PRBool aCBHeightChanged,
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nsRect* aChildBounds = nsnull);
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void DestroyFrames(nsIFrame* aDelegatingFrame,
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nsIFrame* aDestructRoot);
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PRBool HasAbsoluteFrames() {return mAbsoluteFrames.NotEmpty();}
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// Mark our size-dependent absolute frames with NS_FRAME_HAS_DIRTY_CHILDREN
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// so that we'll make sure to reflow them.
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void MarkSizeDependentFramesDirty();
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// Mark all our absolute frames with NS_FRAME_IS_DIRTY
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void MarkAllFramesDirty();
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protected:
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// Returns PR_TRUE if the position of f depends on the position of
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// its placeholder or if the position or size of f depends on a
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// containing block dimension that changed.
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PRBool FrameDependsOnContainer(nsIFrame* f, PRBool aCBWidthChanged,
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PRBool aCBHeightChanged);
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nsresult ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame,
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nsPresContext* 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 aConstrainHeight,
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nsIFrame* aKidFrame,
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nsReflowStatus& aStatus,
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nsRect* aChildBounds);
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// Mark our absolute frames dirty. If aMarkAllDirty is true, all will be
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// marked with NS_FRAME_IS_DIRTY. Otherwise, the size-dependant ones will be
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// marked with NS_FRAME_HAS_DIRTY_CHILDREN.
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void DoMarkFramesDirty(PRBool aMarkAllDirty);
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protected:
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nsFrameList mAbsoluteFrames; // additional named child list
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#ifdef DEBUG
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nsIAtom* const mChildListName; // nsGkAtoms::fixedList or nsGkAtoms::absoluteList
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// helper routine for debug printout
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void PrettyUC(nscoord aSize,
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char* aBuf);
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#endif
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};
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#endif /* nsnsAbsoluteContainingBlock_h___ */
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