2001-09-29 00:14:13 +04:00
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2001-10-26 09:06:07 +04:00
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// vim:cindent:ts=2:et:sw=2:
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2001-09-29 00:14:13 +04:00
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/* ***** BEGIN LICENSE BLOCK *****
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2004-04-18 18:30:37 +04:00
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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1998-04-14 00:24:54 +04:00
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*
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2004-04-18 18:30:37 +04:00
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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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1998-04-14 00:24:54 +04:00
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*
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2001-09-29 00:14:13 +04:00
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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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1998-04-14 00:24:54 +04:00
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*
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1999-11-06 06:40:37 +03:00
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* The Original Code is mozilla.org code.
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*
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2004-04-18 18:30:37 +04:00
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* The Initial Developer of the Original Code is
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2001-09-29 00:14:13 +04:00
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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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1999-11-06 06:40:37 +03:00
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*
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2001-09-29 00:14:13 +04:00
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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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2004-04-18 18:30:37 +04:00
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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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2001-09-29 00:14:13 +04:00
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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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2004-04-18 18:30:37 +04:00
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* use your version of this file under the terms of the MPL, indicate your
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2001-09-29 00:14:13 +04:00
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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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2004-04-18 18:30:37 +04:00
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* the terms of any one of the MPL, the GPL or the LGPL.
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2001-09-29 00:14:13 +04:00
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*
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* ***** END LICENSE BLOCK ***** */
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1998-04-14 00:24:54 +04:00
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#ifndef nsSpaceManager_h___
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#define nsSpaceManager_h___
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1998-05-19 07:00:56 +04:00
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#include "prclist.h"
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2001-10-25 05:08:40 +04:00
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#include "nsIntervalSet.h"
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2001-10-26 09:06:07 +04:00
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#include "nsISupports.h"
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#include "nsCoord.h"
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#include "nsRect.h"
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2001-10-25 05:08:40 +04:00
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class nsIPresShell;
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2001-10-26 09:06:07 +04:00
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class nsIFrame;
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class nsVoidArray;
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struct nsSize;
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2003-05-23 00:56:35 +04:00
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struct nsHTMLReflowState;
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2004-08-01 03:15:21 +04:00
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class nsPresContext;
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1998-04-14 00:24:54 +04:00
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2001-09-11 04:55:05 +04:00
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#define NS_SPACE_MANAGER_CACHE_SIZE 4
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1998-04-14 00:24:54 +04:00
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/**
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* Information about a particular trapezoid within a band. The space described
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* by the trapezoid is in one of three states:
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* <ul>
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* <li>available
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* <li>occupied by one frame
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* <li>occupied by more than one frame
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* </ul>
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1998-04-14 00:24:54 +04:00
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*/
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struct nsBandTrapezoid {
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enum State {Available, Occupied, OccupiedMultiple};
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nscoord mTopY, mBottomY; // top and bottom y-coordinates
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nscoord mTopLeftX, mBottomLeftX; // left edge x-coordinates
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nscoord mTopRightX, mBottomRightX; // right edge x-coordinates
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State mState; // state of the space
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union {
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nsIFrame* mFrame; // single frame occupying the space
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const nsVoidArray* mFrames; // list of frames occupying the space
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};
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// Get the height of the trapezoid
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nscoord GetHeight() const {return mBottomY - mTopY;}
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// Get the bounding rect of the trapezoid
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inline void GetRect(nsRect& aRect) const;
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1998-04-14 00:24:54 +04:00
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// Set the trapezoid from a rectangle
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inline void operator=(const nsRect& aRect);
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1998-05-13 03:02:02 +04:00
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2001-10-26 09:06:07 +04:00
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// Do these trapezoids have the same geometry, frame, and state?
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inline PRBool Equals(const nsBandTrapezoid& aTrap) const;
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1998-05-13 03:02:02 +04:00
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2001-10-26 09:06:07 +04:00
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// Do these trapezoids have the same geometry?
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inline PRBool EqualGeometry(const nsBandTrapezoid& aTrap) const;
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1998-05-13 03:02:02 +04:00
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2001-10-26 09:06:07 +04:00
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nsBandTrapezoid()
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: mTopY(0),
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mBottomY(0),
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mTopLeftX(0),
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mBottomLeftX(0),
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mTopRightX(0),
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mBottomRightX(0),
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mFrame(nsnull)
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{
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}
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};
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1998-04-14 00:24:54 +04:00
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2001-10-26 09:06:07 +04:00
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inline void nsBandTrapezoid::GetRect(nsRect& aRect) const
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{
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aRect.x = PR_MIN(mTopLeftX, mBottomLeftX);
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aRect.y = mTopY;
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2002-09-25 01:02:20 +04:00
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aRect.width = PR_MAX(mTopRightX, mBottomRightX);
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if (NS_MAXSIZE != aRect.width) {
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aRect.width -= aRect.x;
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}
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aRect.height = (NS_MAXSIZE == mBottomY) ? NS_MAXSIZE : mBottomY - mTopY;
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2001-10-26 09:06:07 +04:00
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}
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inline void nsBandTrapezoid::operator=(const nsRect& aRect)
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{
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mTopLeftX = mBottomLeftX = aRect.x;
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mTopRightX = mBottomRightX = aRect.XMost();
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mTopY = aRect.y;
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mBottomY = aRect.YMost();
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}
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inline PRBool nsBandTrapezoid::Equals(const nsBandTrapezoid& aTrap) const
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{
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return (
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mTopLeftX == aTrap.mTopLeftX &&
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mBottomLeftX == aTrap.mBottomLeftX &&
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mTopRightX == aTrap.mTopRightX &&
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mBottomRightX == aTrap.mBottomRightX &&
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mTopY == aTrap.mTopY &&
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mBottomY == aTrap.mBottomY &&
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mState == aTrap.mState &&
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mFrame == aTrap.mFrame
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);
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}
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inline PRBool nsBandTrapezoid::EqualGeometry(const nsBandTrapezoid& aTrap) const
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{
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return (
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mTopLeftX == aTrap.mTopLeftX &&
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mBottomLeftX == aTrap.mBottomLeftX &&
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mTopRightX == aTrap.mTopRightX &&
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mBottomRightX == aTrap.mBottomRightX &&
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mTopY == aTrap.mTopY &&
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mBottomY == aTrap.mBottomY
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);
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}
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/**
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* Structure used for describing the space within a band.
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* @see #GetBandData()
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*/
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struct nsBandData {
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PRInt32 mCount; // [out] actual number of trapezoids in the band data
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PRInt32 mSize; // [in] the size of the array (number of trapezoids)
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nsBandTrapezoid* mTrapezoids; // [out] array of length 'size'
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};
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/**
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* Class for dealing with bands of available space. The space manager
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* defines a coordinate space with an origin at (0, 0) that grows down
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* and to the right.
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*/
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class nsSpaceManager {
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public:
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nsSpaceManager(nsIPresShell* aPresShell, nsIFrame* aFrame);
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~nsSpaceManager();
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2002-07-03 21:14:41 +04:00
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void* operator new(size_t aSize) CPP_THROW_NEW;
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2001-10-26 09:06:07 +04:00
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void operator delete(void* aPtr, size_t aSize);
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static void Shutdown();
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/*
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* Get the frame that's associated with the space manager. This frame
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* created the space manager, and the world coordinate space is
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* relative to this frame.
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*
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* You can use QueryInterface() on this frame to get any additional
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* interfaces.
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*/
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nsIFrame* GetFrame() const { return mFrame; }
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/**
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* Translate the current origin by the specified (dx, dy). This
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* creates a new local coordinate space relative to the current
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* coordinate space.
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*/
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void Translate(nscoord aDx, nscoord aDy) { mX += aDx; mY += aDy; }
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/**
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* Returns the current translation from local coordinate space to
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* world coordinate space. This represents the accumulated calls to
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* Translate().
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*/
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void GetTranslation(nscoord& aX, nscoord& aY) const { aX = mX; aY = mY; }
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2002-12-19 03:12:08 +03:00
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/**
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* Returns the x-most rect in the space manager, or 0 if there are no
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* rects.
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*
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* @return PR_TRUE if there are bands and PR_FALSE if there are no bands
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*/
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PRBool XMost(nscoord& aXMost) const;
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2001-10-26 09:06:07 +04:00
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/**
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* Returns the y-most of the bottommost band or 0 if there are no bands.
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*
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* @return PR_TRUE if there are bands and PR_FALSE if there are no bands
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*/
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PRBool YMost(nscoord& aYMost) const;
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/**
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* Returns a band starting at the specified y-offset. The band data
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* indicates which parts of the band are available, and which parts
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* are unavailable
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*
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* The band data that is returned is in the coordinate space of the
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* local coordinate system.
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*
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* The local coordinate space origin, the y-offset, and the max size
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* describe a rectangle that's used to clip the underlying band of
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* available space, i.e.
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* {0, aYOffset, aMaxSize.width, aMaxSize.height} in the local
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* coordinate space
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*
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* @param aYOffset the y-offset of where the band begins. The coordinate is
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* relative to the upper-left corner of the local coordinate space
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* @param aMaxSize the size to use to constrain the band data
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* @param aBandData [in,out] used to return the list of trapezoids that
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* describe the available space and the unavailable space
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* @return NS_OK if successful and NS_ERROR_FAILURE if the band data is not
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* not large enough. The 'count' member of the band data struct
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* indicates how large the array of trapezoids needs to be
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*/
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nsresult GetBandData(nscoord aYOffset,
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const nsSize& aMaxSize,
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nsBandData& aBandData) const;
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/**
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* Add a rectangular region of unavailable space. The space is
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* relative to the local coordinate system.
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*
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* The region is tagged with a frame
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*
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* @param aFrame the frame used to identify the region. Must not be NULL
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* @param aUnavailableSpace the bounding rect of the unavailable space
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* @return NS_OK if successful
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* NS_ERROR_FAILURE if there is already a region tagged with aFrame
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*/
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nsresult AddRectRegion(nsIFrame* aFrame,
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const nsRect& aUnavailableSpace);
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/**
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* Remove the region associated with aFrane.
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*
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* Returns NS_OK if successful and NS_ERROR_INVALID_ARG if there is no region
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* tagged with aFrame
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*/
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2003-03-12 02:56:49 +03:00
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protected: /* doesn't work in the general case */
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2001-10-26 09:06:07 +04:00
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nsresult RemoveRegion(nsIFrame* aFrame);
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2003-03-12 02:56:49 +03:00
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public:
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2001-10-26 09:06:07 +04:00
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/**
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* Clears the list of regions representing the unavailable space.
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*/
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void ClearRegions();
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/**
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* Methods for dealing with the propagation of float damage during
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* reflow.
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*/
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PRBool HasFloatDamage()
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{
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return !mFloatDamage.IsEmpty();
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}
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void IncludeInDamage(nscoord aIntervalBegin, nscoord aIntervalEnd)
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{
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mFloatDamage.IncludeInterval(aIntervalBegin + mY, aIntervalEnd + mY);
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}
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PRBool IntersectsDamage(nscoord aIntervalBegin, nscoord aIntervalEnd)
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{
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return mFloatDamage.Intersects(aIntervalBegin + mY, aIntervalEnd + mY);
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}
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2001-10-25 05:08:40 +04:00
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2002-08-19 08:41:57 +04:00
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/**
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* Pushes the current state of the space manager onto a state stack.
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*/
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void PushState();
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/**
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* Restores the space manager to the state at the top of the state stack,
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* then pops this state off the stack.
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*/
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void PopState();
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2003-03-12 02:56:49 +03:00
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/**
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* Get the top of the last region placed into the space manager, to
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* enforce the rule that a float can't be above an earlier float.
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* Returns the minimum nscoord value if there are no regions.
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*/
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nscoord GetLowestRegionTop();
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2004-06-08 23:18:30 +04:00
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/**
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* Return the coordinate of the lowest float matching aBreakType in this
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* space manager. Returns aY if there are no matching floats.
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*/
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nscoord ClearFloats(nscoord aY, PRUint8 aBreakType);
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1999-10-02 04:52:01 +04:00
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#ifdef DEBUG
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2001-10-26 09:06:07 +04:00
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/**
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* Dump the state of the spacemanager out to a file
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*/
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nsresult List(FILE* out);
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1999-10-02 04:52:01 +04:00
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#endif
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1998-04-14 00:24:54 +04:00
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protected:
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1998-05-19 07:00:56 +04:00
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// Structure that maintains information about the region associated
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// with a particular frame
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struct FrameInfo {
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1999-07-03 03:31:01 +04:00
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nsIFrame* const mFrame;
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nsRect mRect; // rectangular region
|
1999-10-06 08:22:51 +04:00
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FrameInfo* mNext;
|
1998-05-13 20:22:44 +04:00
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1998-05-19 07:00:56 +04:00
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FrameInfo(nsIFrame* aFrame, const nsRect& aRect);
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2000-12-16 21:56:06 +03:00
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#ifdef NS_BUILD_REFCNT_LOGGING
|
1999-10-09 00:41:19 +04:00
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~FrameInfo();
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#endif
|
1998-05-19 07:00:56 +04:00
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};
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2002-08-19 08:41:57 +04:00
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// Structure that stores the current state of a frame manager for
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// Save/Restore purposes.
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struct SpaceManagerState {
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nscoord mX, mY;
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nsIFrame *mLastFrame;
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2002-12-19 03:12:08 +03:00
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nscoord mXMost;
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2003-03-12 02:56:49 +03:00
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nscoord mLowestTop;
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2002-08-19 08:41:57 +04:00
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SpaceManagerState *mNext;
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};
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|
1999-02-26 20:36:00 +03:00
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public:
|
1998-05-19 07:00:56 +04:00
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// Doubly linked list of band rects
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struct BandRect : PRCListStr {
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1999-07-03 03:31:01 +04:00
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nscoord mLeft, mTop;
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nscoord mRight, mBottom;
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2003-03-12 02:56:49 +03:00
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PRInt32 mNumFrames; // number of frames occupying this rect
|
1998-05-13 20:22:44 +04:00
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union {
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1999-07-03 03:31:01 +04:00
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nsIFrame* mFrame; // single frame occupying the space
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nsVoidArray* mFrames; // list of frames occupying the space
|
1998-05-13 20:22:44 +04:00
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};
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|
1998-05-19 07:00:56 +04:00
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BandRect(nscoord aLeft, nscoord aTop,
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nscoord aRight, nscoord aBottom,
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nsIFrame*);
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BandRect(nscoord aLeft, nscoord aTop,
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nscoord aRight, nscoord aBottom,
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nsVoidArray*);
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~BandRect();
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|
1998-05-20 02:55:40 +04:00
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// List operations
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BandRect* Next() const {return (BandRect*)PR_NEXT_LINK(this);}
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BandRect* Prev() const {return (BandRect*)PR_PREV_LINK(this);}
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void InsertBefore(BandRect* aBandRect) {PR_INSERT_BEFORE(aBandRect, this);}
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void InsertAfter(BandRect* aBandRect) {PR_INSERT_AFTER(aBandRect, this);}
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void Remove() {PR_REMOVE_LINK(this);}
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|
1998-05-19 07:00:56 +04:00
|
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|
// Split the band rect into two vertically, with this band rect becoming
|
|
|
|
// the top part, and a new band rect being allocated and returned for the
|
|
|
|
// bottom part
|
1998-05-20 02:55:40 +04:00
|
|
|
//
|
|
|
|
// Does not insert the new band rect into the linked list
|
1998-05-19 07:00:56 +04:00
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BandRect* SplitVertically(nscoord aBottom);
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|
// Split the band rect into two horizontally, with this band rect becoming
|
|
|
|
// the left part, and a new band rect being allocated and returned for the
|
|
|
|
// right part
|
1998-05-20 02:55:40 +04:00
|
|
|
//
|
|
|
|
// Does not insert the new band rect into the linked list
|
1998-05-19 07:00:56 +04:00
|
|
|
BandRect* SplitHorizontally(nscoord aRight);
|
|
|
|
|
|
|
|
// Accessor functions
|
1998-05-19 19:30:10 +04:00
|
|
|
PRBool IsOccupiedBy(const nsIFrame*) const;
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|
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|
void AddFrame(const nsIFrame*);
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|
void RemoveFrame(const nsIFrame*);
|
|
|
|
PRBool HasSameFrameList(const BandRect* aBandRect) const;
|
1999-01-04 07:54:33 +03:00
|
|
|
PRInt32 Length() const;
|
1998-04-29 04:58:16 +04:00
|
|
|
};
|
|
|
|
|
1998-05-20 02:55:40 +04:00
|
|
|
// Circular linked list of band rects
|
|
|
|
struct BandList : BandRect {
|
|
|
|
BandList();
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|
|
|
|
|
|
|
// Accessors
|
|
|
|
PRBool IsEmpty() const {return PR_CLIST_IS_EMPTY((PRCListStr*)this);}
|
|
|
|
BandRect* Head() const {return (BandRect*)PR_LIST_HEAD(this);}
|
|
|
|
BandRect* Tail() const {return (BandRect*)PR_LIST_TAIL(this);}
|
|
|
|
|
|
|
|
// Operations
|
|
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|
void Append(BandRect* aBandRect) {PR_APPEND_LINK(aBandRect, this);}
|
|
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|
|
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|
|
// Remove and delete all the band rects in the list
|
|
|
|
void Clear();
|
|
|
|
};
|
|
|
|
|
1999-02-26 20:36:00 +03:00
|
|
|
protected:
|
1998-05-19 07:00:56 +04:00
|
|
|
nsIFrame* const mFrame; // frame associated with the space manager
|
|
|
|
nscoord mX, mY; // translation from local to global coordinate space
|
1999-06-24 06:04:50 +04:00
|
|
|
BandList mBandList; // header/sentinel for circular linked list of band rects
|
2002-12-19 03:12:08 +03:00
|
|
|
nscoord mXMost;
|
2003-03-12 02:56:49 +03:00
|
|
|
nscoord mLowestTop; // the lowest *top*
|
1999-10-06 08:22:51 +04:00
|
|
|
FrameInfo* mFrameInfoMap;
|
2001-10-25 05:08:40 +04:00
|
|
|
nsIntervalSet mFloatDamage;
|
1998-04-14 00:24:54 +04:00
|
|
|
|
2002-08-19 08:41:57 +04:00
|
|
|
SpaceManagerState *mSavedStates;
|
2004-06-06 22:45:02 +04:00
|
|
|
SpaceManagerState mAutoState;
|
2002-08-19 08:41:57 +04:00
|
|
|
|
1998-05-19 07:00:56 +04:00
|
|
|
protected:
|
|
|
|
FrameInfo* GetFrameInfoFor(nsIFrame* aFrame);
|
|
|
|
FrameInfo* CreateFrameInfo(nsIFrame* aFrame, const nsRect& aRect);
|
|
|
|
void DestroyFrameInfo(FrameInfo*);
|
1998-04-14 00:24:54 +04:00
|
|
|
|
1998-05-19 07:00:56 +04:00
|
|
|
void ClearFrameInfo();
|
|
|
|
void ClearBandRects();
|
1998-04-14 00:24:54 +04:00
|
|
|
|
1998-05-19 07:00:56 +04:00
|
|
|
BandRect* GetNextBand(const BandRect* aBandRect) const;
|
|
|
|
void DivideBand(BandRect* aBand, nscoord aBottom);
|
1998-05-20 02:55:40 +04:00
|
|
|
PRBool CanJoinBands(BandRect* aBand, BandRect* aPrevBand);
|
1998-05-19 19:30:10 +04:00
|
|
|
PRBool JoinBands(BandRect* aBand, BandRect* aPrevBand);
|
1998-05-19 07:00:56 +04:00
|
|
|
void AddRectToBand(BandRect* aBand, BandRect* aBandRect);
|
|
|
|
void InsertBandRect(BandRect* aBandRect);
|
1998-04-14 00:24:54 +04:00
|
|
|
|
1999-01-04 07:54:33 +03:00
|
|
|
nsresult GetBandAvailableSpace(const BandRect* aBand,
|
1998-05-19 07:00:56 +04:00
|
|
|
nscoord aY,
|
|
|
|
const nsSize& aMaxSize,
|
|
|
|
nsBandData& aAvailableSpace) const;
|
1998-04-14 00:24:54 +04:00
|
|
|
|
|
|
|
private:
|
2001-09-11 04:55:05 +04:00
|
|
|
static PRInt32 sCachedSpaceManagerCount;
|
2001-10-26 09:06:07 +04:00
|
|
|
static void* sCachedSpaceManagers[NS_SPACE_MANAGER_CACHE_SIZE];
|
2001-09-11 04:55:05 +04:00
|
|
|
|
|
|
|
nsSpaceManager(const nsSpaceManager&); // no implementation
|
|
|
|
void operator=(const nsSpaceManager&); // no implementation
|
1998-04-14 00:24:54 +04:00
|
|
|
};
|
|
|
|
|
2003-05-23 00:56:35 +04:00
|
|
|
/**
|
|
|
|
* A helper class to manage maintenance of the space manager during
|
|
|
|
* nsBlockFrame::Reflow. It automatically restores the old space
|
|
|
|
* manager in the reflow state when the object goes out of scope.
|
|
|
|
*/
|
|
|
|
class nsAutoSpaceManager {
|
|
|
|
public:
|
|
|
|
nsAutoSpaceManager(nsHTMLReflowState& aReflowState)
|
|
|
|
: mReflowState(aReflowState),
|
|
|
|
#ifdef DEBUG
|
|
|
|
mOwns(PR_TRUE),
|
|
|
|
#endif
|
|
|
|
mNew(nsnull),
|
|
|
|
mOld(nsnull) {}
|
|
|
|
|
|
|
|
~nsAutoSpaceManager();
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Create a new space manager for the specified frame. This will
|
|
|
|
* `remember' the old space manager, and install the new space
|
|
|
|
* manager in the reflow state.
|
|
|
|
*/
|
|
|
|
nsresult
|
2004-08-01 03:15:21 +04:00
|
|
|
CreateSpaceManagerFor(nsPresContext *aPresContext,
|
2003-05-23 00:56:35 +04:00
|
|
|
nsIFrame *aFrame);
|
|
|
|
|
|
|
|
#ifdef DEBUG
|
|
|
|
/**
|
|
|
|
* `Orphan' any space manager that the nsAutoSpaceManager created;
|
|
|
|
* i.e., make it so that we don't destroy the space manager when we
|
|
|
|
* go out of scope.
|
|
|
|
*/
|
|
|
|
void DebugOrphanSpaceManager() { mOwns = PR_FALSE; }
|
|
|
|
#endif
|
|
|
|
|
|
|
|
protected:
|
|
|
|
nsHTMLReflowState &mReflowState;
|
|
|
|
#ifdef DEBUG
|
|
|
|
PRBool mOwns;
|
|
|
|
#endif
|
|
|
|
nsSpaceManager *mNew;
|
|
|
|
nsSpaceManager *mOld;
|
|
|
|
};
|
|
|
|
|
1998-04-14 00:24:54 +04:00
|
|
|
#endif /* nsSpaceManager_h___ */
|
|
|
|
|