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157c017816
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
150 lines
6.3 KiB
C++
150 lines
6.3 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 Communicator client 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 nsILineIterator_h___
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#define nsILineIterator_h___
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#include "nsISupports.h"
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/* a6cf90ff-15b3-11d2-932e-00805f8add32 */
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#define NS_ILINE_ITERATOR_IID \
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{ 0xa6cf90ff, 0x15b3, 0x11d2,{0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}}
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/* {80AA3D7A-E0BF-4e18-8A82-2110397D7BC4}*/
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#define NS_ILINE_ITERATOR_NAV_IID \
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{ 0x80aa3d7a, 0xe0bf, 0x4e18,{0x8a, 0x82, 0x21, 0x10, 0x39, 0x7d, 0x7b, 0xc4}}
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// Line iterator API.
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//
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// Lines are numbered from 0 to N, where 0 is the top line and N is
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// the bottom line.
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//
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// NOTE: while you can get this interface by doing a slezy hacky
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// QueryInterface on block frames, it isn't like a normal com
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// interface: its not reflexive (you can't query back to the block
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// frame) and unlike other frames, it *IS* reference counted so don't
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// forget to NS_RELEASE it when you are done with it!
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// Line Flags (see GetLine below)
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// This bit is set when the line is wrapping up a block frame. When
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// clear, it means that the line contains inline elements.
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#define NS_LINE_FLAG_IS_BLOCK 0x1
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// This bit is set when the line ends in some sort of break.
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#define NS_LINE_FLAG_ENDS_IN_BREAK 0x4
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class nsILineIterator : public nsISupports {
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_ILINE_ITERATOR_IID)
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// Return the number of lines in the block.
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NS_IMETHOD GetNumLines(PRInt32* aResult) = 0;
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// Return the prevailing direction for the line. aIsRightToLeft will
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// be set to PR_TRUE if the CSS direction property for the block is
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// "rtl", otherwise aIsRightToLeft will be set to PR_FALSE.
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NS_IMETHOD GetDirection(PRBool* aIsRightToLeft) = 0;
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// Return structural information about a line. aFirstFrameOnLine is
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// the first frame on the line and aNumFramesOnLine is the number of
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// frames that are on the line. If the line-number is invalid then
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// aFirstFrameOnLine will be nsnull and aNumFramesOnLine will be
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// zero.
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//
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// For valid line numbers, aLineBounds is set to the bounding box of
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// the line (which is based on the in-flow position of the frames on
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// the line; if a frame was moved because of relative positioning
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// then its coordinates may be outside the line bounds).
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//
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// In addition, aLineFlags will contain flag information about the
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// line.
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NS_IMETHOD GetLine(PRInt32 aLineNumber,
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nsIFrame** aFirstFrameOnLine,
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PRInt32* aNumFramesOnLine,
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nsRect& aLineBounds,
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PRUint32* aLineFlags) = 0;
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// Given a frame thats a child of the block, find which line its on
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// and return that line index into aIndexResult. aIndexResult will
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// be set to -1 if the frame cannot be found.
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NS_IMETHOD FindLineContaining(nsIFrame* aFrame,
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PRInt32* aLineNumberResult) = 0;
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// Given a Y coordinate relative to the block that provided this
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// line iterator, find the line that contains the Y
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// coordinate. Returns -1 in aLineNumberResult if the Y coordinate
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// is above the first line. Returns N (where N is the number of
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// lines) if the Y coordinate is below the last line.
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NS_IMETHOD FindLineAt(nscoord aY,
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PRInt32* aLineNumberResult) = 0;
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// Given a line number and an X coordinate, find the frame on the
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// line that is nearest to the X coordinate. The
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// aXIsBeforeFirstFrame and aXIsAfterLastFrame flags are updated
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// appropriately.
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NS_IMETHOD FindFrameAt(PRInt32 aLineNumber,
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nscoord aX,
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#ifdef IBMBIDI
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//This parameter determines whether to traverse the frames in logical or visual order
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PRBool aCouldBeReordered,
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#endif
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nsIFrame** aFrameFound,
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PRBool* aXIsBeforeFirstFrame,
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PRBool* aXIsAfterLastFrame) = 0;
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// Give the line iterator implementor a chance todo something more complicated than
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// nsIFrame::GetNextSibling()
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NS_IMETHOD GetNextSiblingOnLine(nsIFrame*& aFrame, PRInt32 aLineNumber) = 0;
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#ifdef IBMBIDI
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// Check whether visual and logical order of frames within a line are identical.
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// If not, return the first and last visual frames
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NS_IMETHOD CheckLineOrder(PRInt32 aLine,
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PRBool *aIsReordered,
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nsIFrame **aFirstVisual,
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nsIFrame **aLastVisual) = 0;
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#endif
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};
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//special line iterator for keyboard navigation
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class nsILineIteratorNavigator : public nsILineIterator {
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_ILINE_ITERATOR_NAV_IID)
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};
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#endif /* nsILineIterator_h___ */
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