8b3489a026
Make the line list doubly linked and access it through a list class and iterators. Stop recomputing margins on all of the children of each block in the reflow chain (which causes O(N^2) state recovery during incremental reflow). Instead, add a second dirty bit to the lines and walk backwards through the line list to recompute vertical margins only when either dirty bit is set and the previous line was not reflowed. Add nsIFrame::IsEmpty to identify frames through which margins collapse. Fix O(N^2) propagation of float damage by maintaining a set of intervals damaged by floats (bug 61962) and be sure to damage the correct areas (bug 48138). Introduce nsCollapsingMargin to do correct collapsing of combinations of positive and negative margins (bug 50142). Clean up some odds and ends and fix another smaller O(N^2) problem in nsBlockFrame::AddFrames. r=attinasi, rbs sr=waterson git-svn-id: svn://10.0.0.236/trunk@106224 18797224-902f-48f8-a5cc-f745e15eee43
92 lines
3.4 KiB
C++
92 lines
3.4 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: NPL 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 Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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 NPL, 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 NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsPlaceholderFrame_h___
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#define nsPlaceholderFrame_h___
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#include "nsFrame.h"
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/**
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* Implementation of a frame that's used as a placeholder for a frame that
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* has been moved out of the flow
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*/
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class nsPlaceholderFrame : public nsFrame {
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public:
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/**
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* Create a new placeholder frame
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*/
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friend nsresult NS_NewPlaceholderFrame(nsIPresShell* aPresShell, nsIFrame** aInstancePtrResult);
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// Get/Set the associated out of flow frame
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nsIFrame* GetOutOfFlowFrame() const {return mOutOfFlowFrame;}
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void SetOutOfFlowFrame(nsIFrame* aFrame) {mOutOfFlowFrame = aFrame;}
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// nsIHTMLReflow overrides
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NS_IMETHOD Reflow(nsIPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus);
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// nsIFrame overrides
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#ifdef DEBUG
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NS_IMETHOD Paint(nsIPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
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nsFramePaintLayer aWhichLayer,
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PRUint32 aFlags = 0);
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NS_IMETHOD List(nsIPresContext* aPresContext, FILE* out, PRInt32 aIndent) const;
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#endif
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/**
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* Get the "type" of the frame
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*
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* @see nsLayoutAtoms::placeholderFrame
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*/
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NS_IMETHOD GetFrameType(nsIAtom** aType) const;
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#ifdef DEBUG
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NS_IMETHOD SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const;
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NS_IMETHOD GetFrameName(nsString& aResult) const;
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#endif
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NS_IMETHOD IsEmpty(PRBool aIsQuirkMode, PRBool aIsPre, PRBool *aResult);
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protected:
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nsIFrame* mOutOfFlowFrame;
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};
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#endif /* nsPlaceholderFrame_h___ */
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