зеркало из https://github.com/mozilla/gecko-dev.git
326 строки
12 KiB
C++
326 строки
12 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 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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* Steve Clark <buster@netscape.com>
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* Robert O'Callahan <roc+moz@cs.cmu.edu>
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* L. David Baron <dbaron@dbaron.org>
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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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/* state used in reflow of block frames */
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#ifndef nsBlockReflowState_h__
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#define nsBlockReflowState_h__
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#include "nsFloatManager.h"
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#include "nsLineBox.h"
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#include "nsFrameList.h"
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#include "nsBlockFrame.h"
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// block reflow state flags
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#define BRS_UNCONSTRAINEDHEIGHT 0x00000001
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#define BRS_ISTOPMARGINROOT 0x00000002 // Is this frame a root for top/bottom margin collapsing?
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#define BRS_ISBOTTOMMARGINROOT 0x00000004
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#define BRS_APPLYTOPMARGIN 0x00000008 // See ShouldApplyTopMargin
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#define BRS_ISFIRSTINFLOW 0x00000010
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// Set when mLineAdjacentToTop is valid
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#define BRS_HAVELINEADJACENTTOTOP 0x00000020
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// Set when the block has the equivalent of NS_BLOCK_FLOAT_MGR
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#define BRS_FLOAT_MGR 0x00000040
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// Set when nsLineLayout::LineIsEmpty was true at the end of reflowing
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// the current line
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#define BRS_LINE_LAYOUT_EMPTY 0x00000080
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#define BRS_ISOVERFLOWCONTAINER 0x00000100
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// Our mFloatContinuations list is stored on the blocks' proptable
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#define BRS_PROPTABLE_FLOATCLIST 0x00000200
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#define BRS_LASTFLAG BRS_PROPTABLE_FLOATCLIST
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class nsBlockReflowState {
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public:
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nsBlockReflowState(const nsHTMLReflowState& aReflowState,
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nsPresContext* aPresContext,
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nsBlockFrame* aFrame,
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const nsHTMLReflowMetrics& aMetrics,
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PRBool aTopMarginRoot, PRBool aBottomMarginRoot,
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PRBool aBlockNeedsFloatManager);
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~nsBlockReflowState();
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/**
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* Get the available reflow space (the area not occupied by floats)
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* for the current y coordinate. The available space is relative to
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* our coordinate system, which is the content box, with (0, 0) in the
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* upper left.
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*
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* Returns whether there are floats present at the given vertical
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* coordinate and within the width of the content rect.
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*/
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nsFlowAreaRect GetFloatAvailableSpace() const
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{ return GetFloatAvailableSpace(mY, PR_FALSE); }
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nsFlowAreaRect GetFloatAvailableSpace(nscoord aY,
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PRBool aRelaxHeightConstraint) const
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{ return GetFloatAvailableSpaceWithState(aY, aRelaxHeightConstraint,
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nsnull); }
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nsFlowAreaRect
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GetFloatAvailableSpaceWithState(nscoord aY, PRBool aRelaxHeightConstraint,
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nsFloatManager::SavedState *aState) const;
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nsFlowAreaRect
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GetFloatAvailableSpaceForHeight(nscoord aY, nscoord aHeight,
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nsFloatManager::SavedState *aState) const;
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/*
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* The following functions all return PR_TRUE if they were able to
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* place the float, PR_FALSE if the float did not fit in available
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* space.
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* aLineLayout is null when we are reflowing float continuations (because
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* they are not associated with a line box).
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*/
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PRBool AddFloat(nsLineLayout* aLineLayout,
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nsIFrame* aFloat,
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nscoord aAvailableWidth,
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nsReflowStatus& aReflowStatus);
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PRBool CanPlaceFloat(const nsSize& aFloatSize, PRUint8 aFloats,
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const nsFlowAreaRect& aFloatAvailableSpace,
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PRBool aForceFit);
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PRBool FlowAndPlaceFloat(nsIFrame* aFloat,
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nsReflowStatus& aReflowStatus,
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PRBool aForceFit);
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PRBool PlaceBelowCurrentLineFloats(nsFloatCacheFreeList& aFloats, PRBool aForceFit);
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// Returns the first coordinate >= aY that clears the
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// floats indicated by aBreakType and has enough width between floats
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// (or no floats remaining) to accomodate aReplacedBlock.
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nscoord ClearFloats(nscoord aY, PRUint8 aBreakType,
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nsIFrame *aReplacedBlock = nsnull);
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PRBool IsAdjacentWithTop() const {
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return mY ==
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((mFlags & BRS_ISFIRSTINFLOW) ? mReflowState.mComputedBorderPadding.top : 0);
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}
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/**
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* Adjusts the border/padding to return 0 for the top if
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* we are not the first in flow.
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*/
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nsMargin BorderPadding() const {
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nsMargin result = mReflowState.mComputedBorderPadding;
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if (!(mFlags & BRS_ISFIRSTINFLOW)) {
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result.top = 0;
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if (mFlags & BRS_ISOVERFLOWCONTAINER) {
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result.bottom = 0;
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}
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}
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return result;
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}
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// XXX maybe we should do the same adjustment for continuations here
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const nsMargin& Margin() const {
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return mReflowState.mComputedMargin;
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}
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// Reconstruct the previous bottom margin that goes above |aLine|.
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void ReconstructMarginAbove(nsLineList::iterator aLine);
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// Caller must have called GetAvailableSpace for the correct position
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// (which need not be the current mY). Callers need only pass
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// aReplacedWidth for outer table frames.
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void ComputeReplacedBlockOffsetsForFloats(nsIFrame* aFrame,
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const nsRect& aFloatAvailableSpace,
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nscoord& aLeftResult,
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nscoord& aRightResult,
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nsBlockFrame::ReplacedElementWidthToClear
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*aReplacedWidth = nsnull);
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// Caller must have called GetAvailableSpace for the current mY
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void ComputeBlockAvailSpace(nsIFrame* aFrame,
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const nsStyleDisplay* aDisplay,
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const nsFlowAreaRect& aFloatAvailableSpace,
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PRBool aBlockAvoidsFloats,
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nsRect& aResult);
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protected:
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void RecoverFloats(nsLineList::iterator aLine, nscoord aDeltaY);
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public:
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void RecoverStateFrom(nsLineList::iterator aLine, nscoord aDeltaY);
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void AdvanceToNextLine() {
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if (GetFlag(BRS_LINE_LAYOUT_EMPTY)) {
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SetFlag(BRS_LINE_LAYOUT_EMPTY, PR_FALSE);
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} else {
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mLineNumber++;
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}
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}
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nsLineBox* NewLineBox(nsIFrame* aFrame, PRInt32 aCount, PRBool aIsBlock);
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void FreeLineBox(nsLineBox* aLine);
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//----------------------------------------
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// This state is the "global" state computed once for the reflow of
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// the block.
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// The block frame that is using this object
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nsBlockFrame* mBlock;
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nsPresContext* mPresContext;
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const nsHTMLReflowState& mReflowState;
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nsFloatManager* mFloatManager;
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// The coordinates within the float manager where the block is being
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// placed <b>after</b> taking into account the blocks border and
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// padding. This, therefore, represents the inner "content area" (in
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// spacemanager coordinates) where child frames will be placed,
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// including child blocks and floats.
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nscoord mFloatManagerX, mFloatManagerY;
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// XXX get rid of this
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nsReflowStatus mReflowStatus;
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// The float manager state as it was before the contents of this
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// block. This is needed for positioning bullets, since we only want
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// to move the bullet to flow around floats that were before this
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// block, not floats inside of it.
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nsFloatManager::SavedState mFloatManagerStateBefore;
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nscoord mBottomEdge;
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// The content area to reflow child frames within. The x/y
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// coordinates are known to be mBorderPadding.left and
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// mBorderPadding.top. The width/height may be NS_UNCONSTRAINEDSIZE
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// if the container reflowing this frame has given the frame an
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// unconstrained area.
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nsSize mContentArea;
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// Continuation out-of-flow float frames that need to move to our
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// next in flow are placed here during reflow. At the end of reflow
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// they move to the end of the mFloats list.
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nsFrameList mFloatContinuations;
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// This method makes sure float continuations are accessible to
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// StealFrame. Call it before adding any frames to mFloatContinuations.
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void SetupFloatContinuationList();
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// Use this method to append to mFloatContinuations.
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void AppendFloatContinuation(nsIFrame* aFloatCont) {
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SetupFloatContinuationList();
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mFloatContinuations.AppendFrame(mBlock, aFloatCont);
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}
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// Track child overflow continuations.
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nsOverflowContinuationTracker* mOverflowTracker;
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//----------------------------------------
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// This state is "running" state updated by the reflow of each line
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// in the block. This same state is "recovered" when a line is not
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// dirty and is passed over during incremental reflow.
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// The current line being reflowed
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// If it is mBlock->end_lines(), then it is invalid.
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nsLineList::iterator mCurrentLine;
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// When BRS_HAVELINEADJACENTTOTOP is set, this refers to a line
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// which we know is adjacent to the top of the block (in other words,
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// all lines before it are empty and do not have clearance. This line is
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// always before the current line.
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nsLineList::iterator mLineAdjacentToTop;
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// The current Y coordinate in the block
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nscoord mY;
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// The combined area of all floats placed so far
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nsRect mFloatCombinedArea;
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nsFloatCacheFreeList mFloatCacheFreeList;
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// Previous child. This is used when pulling up a frame to update
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// the sibling list.
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nsIFrame* mPrevChild;
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// The previous child frames collapsed bottom margin value.
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nsCollapsingMargin mPrevBottomMargin;
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// The current next-in-flow for the block. When lines are pulled
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// from a next-in-flow, this is used to know which next-in-flow to
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// pull from. When a next-in-flow is emptied of lines, we advance
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// this to the next next-in-flow.
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nsBlockFrame* mNextInFlow;
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//----------------------------------------
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// Temporary line-reflow state. This state is used during the reflow
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// of a given line, but doesn't have meaning before or after.
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// The list of floats that are "current-line" floats. These are
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// added to the line after the line has been reflowed, to keep the
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// list fiddling from being N^2.
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nsFloatCacheFreeList mCurrentLineFloats;
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// The list of floats which are "below current-line"
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// floats. These are reflowed/placed after the line is reflowed
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// and placed. Again, this is done to keep the list fiddling from
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// being N^2.
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nsFloatCacheFreeList mBelowCurrentLineFloats;
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nscoord mMinLineHeight;
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PRInt32 mLineNumber;
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PRInt16 mFlags;
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PRUint8 mFloatBreakType;
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void SetFlag(PRUint32 aFlag, PRBool aValue)
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{
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NS_ASSERTION(aFlag<=BRS_LASTFLAG, "bad flag");
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NS_ASSERTION(aValue==PR_FALSE || aValue==PR_TRUE, "bad value");
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if (aValue) { // set flag
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mFlags |= aFlag;
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}
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else { // unset flag
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mFlags &= ~aFlag;
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}
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}
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PRBool GetFlag(PRUint32 aFlag) const
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{
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NS_ASSERTION(aFlag<=BRS_LASTFLAG, "bad flag");
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return !!(mFlags & aFlag);
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}
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};
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#endif // nsBlockReflowState_h__
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