зеркало из https://github.com/mozilla/pjs.git
378 строки
9.8 KiB
C++
378 строки
9.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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 1.0 (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"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* under the 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 Netscape Communications
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* Corporation. Portions created by Netscape are Copyright (C) 1998
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* Netscape Communications Corporation. All Rights Reserved.
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*/
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#ifndef nsLineLayout_h___
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#define nsLineLayout_h___
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#include "nsFrame.h"
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#include "nsVoidArray.h"
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#include "nsTextRun.h"
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class nsISpaceManager;
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class nsBlockReflowState;
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class nsPlaceholderFrame;
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struct nsStyleText;
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// If your machine has a limited size stack, you'll want to adjust
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// these numbers. Note that it will force the line layout code to use
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// the heap more so layout will be slower!
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#if defined(XP_MAC)
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#define NS_LINELAYOUT_NUM_FRAMES 15
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#define NS_LINELAYOUT_NUM_SPANS 5
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#else
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#define NS_LINELAYOUT_NUM_FRAMES 50
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#define NS_LINELAYOUT_NUM_SPANS 20
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#endif
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class nsLineLayout {
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public:
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nsLineLayout(nsIPresContext& aPresContext,
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nsISpaceManager* aSpaceManager,
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const nsHTMLReflowState* aOuterReflowState,
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PRBool aComputeMaxElementSize);
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nsLineLayout(nsIPresContext& aPresContext);
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~nsLineLayout();
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void Init(nsBlockReflowState* aState) {
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mBlockRS = aState;
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}
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PRInt32 GetColumn() {
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return mColumn;
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}
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void SetColumn(PRInt32 aNewColumn) {
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mColumn = aNewColumn;
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}
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void AdvanceToNextLine() {
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mLineNumber++;
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}
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PRInt32 GetLineNumber() const {
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return mLineNumber;
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}
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void BeginLineReflow(nscoord aX, nscoord aY,
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nscoord aWidth, nscoord aHeight,
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PRBool aImpactedByFloaters,
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PRBool aIsTopOfPage);
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void EndLineReflow();
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void UpdateBand(nscoord aX, nscoord aY, nscoord aWidth, nscoord aHeight,
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PRBool aPlacedLeftFloater);
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nsresult BeginSpan(nsIFrame* aFrame,
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const nsHTMLReflowState* aSpanReflowState,
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nscoord aLeftEdge,
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nscoord aRightEdge);
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void EndSpan(nsIFrame* aFrame, nsSize& aSizeResult,
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nsSize* aMaxElementSize);
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PRInt32 GetCurrentSpanCount() const;
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void SplitLineTo(PRInt32 aNewCount);
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PRBool IsZeroHeight();
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nsresult ReflowFrame(nsIFrame* aFrame,
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nsIFrame** aNextRCFrame,
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nsReflowStatus& aReflowStatus);
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nscoord GetCarriedOutBottomMargin() const {
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return mCarriedOutBottomMargin;
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}
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nsresult AddBulletFrame(nsIFrame* aFrame,
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const nsHTMLReflowMetrics& aMetrics);
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void RemoveBulletFrame(nsIFrame* aFrame) {
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PushFrame(aFrame);
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}
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void VerticalAlignFrames(nsRect& aLineBoxResult,
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nsSize& aMaxElementSizeResult);
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void TrimTrailingWhiteSpace(nsRect& aLineBounds);
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void HorizontalAlignFrames(nsRect& aLineBounds, PRBool aAllowJustify);
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void RelativePositionFrames(nsRect& aCombinedArea);
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//----------------------------------------
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// Support methods for white-space compression and word-wrapping
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// during line reflow
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void SetEndsInWhiteSpace(PRBool aState) {
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mEndsInWhiteSpace = aState;
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}
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PRBool GetEndsInWhiteSpace() const {
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return mEndsInWhiteSpace;
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}
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void SetUnderstandsWhiteSpace(PRBool aSetting) {
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mUnderstandsWhiteSpace = aSetting;
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}
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void RecordWordFrame(nsIFrame* aWordFrame) {
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mWordFrames.AppendElement(aWordFrame);
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}
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PRBool InWord() const {
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return 0 != mWordFrames.Count();
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}
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void ForgetWordFrame(nsIFrame* aFrame);
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void ForgetWordFrames() {
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mWordFrames.Clear();
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}
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nsIFrame* FindNextText(nsIFrame* aFrame);
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PRBool CanPlaceFloaterNow() const;
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PRBool LineIsEmpty() const;
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PRBool LineIsBreakable() const;
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//----------------------------------------
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// Inform the line-layout about the presence of a floating frame
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// XXX get rid of this: use get-frame-type?
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void InitFloater(nsPlaceholderFrame* aFrame);
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void AddFloater(nsPlaceholderFrame* aFrame);
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//----------------------------------------
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PRBool GetFirstLetterStyleOK() const {
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return mFirstLetterStyleOK;
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}
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void SetFirstLetterStyleOK(PRBool aSetting) {
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mFirstLetterStyleOK = aSetting;
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}
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void SetFirstLetterFrame(nsIFrame* aFrame) {
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mFirstLetterFrame = aFrame;
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}
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//----------------------------------------
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// Text run usage methods. These methods are using during reflow to
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// track the current text run and to advance through text runs.
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void SetReflowTextRuns(nsTextRun* aTextRuns) {
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mReflowTextRuns = aTextRuns;
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}
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//----------------------------------------
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static PRBool TreatFrameAsBlock(nsIFrame* aFrame);
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//----------------------------------------
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// XXX Move this out of line-layout; make some little interface to
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// deal with it...
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// Add another piece of text to a text-run during FindTextRuns.
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// Note: continuation frames must NOT add themselves; just the
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// first-in-flow
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nsresult AddText(nsIFrame* aTextFrame);
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// Close out a text-run during FindTextRuns.
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void EndTextRun();
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// This returns the first nsTextRun found during a FindTextRuns. The
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// internal text-run state is reset.
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nsTextRun* TakeTextRuns();
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nsIPresContext& mPresContext;
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protected:
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// This state is constant for a given block frame doing line layout
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nsISpaceManager* mSpaceManager;
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const nsStyleText* mStyleText;
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const nsHTMLReflowState* mBlockReflowState;
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nsBlockReflowState* mBlockRS;/* XXX hack! */
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nscoord mMinLineHeight;
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PRBool mComputeMaxElementSize;
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PRUint8 mTextAlign;
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// This state varies during the reflow of a line but is line
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// "global" state not span "local" state.
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nsIFrame* mFirstLetterFrame;
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PRInt32 mLineNumber;
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PRInt32 mColumn;
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PRBool mEndsInWhiteSpace;
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PRBool mUnderstandsWhiteSpace;
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PRBool mFirstLetterStyleOK;
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PRBool mIsTopOfPage;
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PRBool mUpdatedBand;
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PRBool mImpactedByFloaters;
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PRBool mCanPlaceFloater;
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PRUint8 mPlacedFloaters;
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PRInt32 mTotalPlacedFrames;
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nsVoidArray mWordFrames;
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nscoord mTopEdge;
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nscoord mBottomEdge;
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nscoord mMaxTopBoxHeight;
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nscoord mMaxBottomBoxHeight;
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nscoord mCarriedOutBottomMargin;
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nsTextRun* mReflowTextRuns;
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nsTextRun* mTextRun;
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// Per-frame data recorded by the line-layout reflow logic. This
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// state is the state needed to post-process the line after reflow
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// has completed (vertical alignment, horizontal alignment,
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// justification and relative positioning).
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struct PerSpanData;
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struct PerFrameData;
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friend struct PerSpanData;
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friend struct PerFrameData;
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struct PerFrameData {
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// link to next/prev frame in same span
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PerFrameData* mNext;
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PerFrameData* mPrev;
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// pointer to child span data if this is an inline container frame
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PerSpanData* mSpan;
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// The frame and its type
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nsIFrame* mFrame;
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nsCSSFrameType mFrameType;
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// From metrics
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nscoord mAscent, mDescent;
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nsRect mBounds;
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nsSize mMaxElementSize;
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nsRect mCombinedArea;
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// From reflow-state
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nsMargin mMargin;
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nsMargin mBorderPadding;
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nsMargin mOffsets;
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PRBool mRelativePos;
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// Other state we use
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PRUint8 mVerticalAlign;
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};
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PerFrameData mFrameDataBuf[NS_LINELAYOUT_NUM_FRAMES];
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PerFrameData* mFrameFreeList;
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PRInt32 mInitialFramesFreed;
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#ifdef AIX
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public:
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#endif
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struct PerSpanData {
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union {
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PerSpanData* mParent;
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PerSpanData* mNextFreeSpan;
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};
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PerFrameData* mFrame;
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PerFrameData* mFirstFrame;
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PerFrameData* mLastFrame;
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const nsHTMLReflowState* mReflowState;
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PRBool mNoWrap;
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PRUint8 mDirection;
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nscoord mLeftEdge;
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nscoord mX;
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nscoord mRightEdge;
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nscoord mTopLeading, mBottomLeading;
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nscoord mLogicalHeight;
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nscoord mMinY, mMaxY;
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void AppendFrame(PerFrameData* pfd) {
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if (nsnull == mLastFrame) {
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mFirstFrame = pfd;
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}
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else {
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mLastFrame->mNext = pfd;
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pfd->mPrev = mLastFrame;
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}
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mLastFrame = pfd;
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}
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};
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#ifdef AIX
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protected:
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#endif
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PerSpanData mSpanDataBuf[NS_LINELAYOUT_NUM_SPANS];
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PerSpanData* mSpanFreeList;
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PRInt32 mInitialSpansFreed;
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PerSpanData* mRootSpan;
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PerSpanData* mCurrentSpan;
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PRInt32 mSpanDepth;
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#ifdef DEBUG
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PRInt32 mSpansAllocated, mSpansFreed;
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PRInt32 mFramesAllocated, mFramesFreed;
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#endif
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// XXX These slots are used ONLY during FindTextRuns
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nsTextRun* mTextRuns;
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nsTextRun** mTextRunP;
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nsTextRun* mNewTextRun;
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nsresult NewPerFrameData(PerFrameData** aResult);
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nsresult NewPerSpanData(PerSpanData** aResult);
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void FreeSpan(PerSpanData* psd);
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PRBool InBlockContext() const {
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return mSpanDepth == 0;
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}
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void PushFrame(nsIFrame* aFrame);
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void ApplyLeftMargin(PerFrameData* pfd,
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nsHTMLReflowState& aReflowState);
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PRBool CanPlaceFrame(PerFrameData* pfd,
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const nsHTMLReflowState& aReflowState,
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PRBool aNotSafeToBreak,
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nsHTMLReflowMetrics& aMetrics,
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nsReflowStatus& aStatus);
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void PlaceFrame(PerFrameData* pfd,
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nsHTMLReflowMetrics& aMetrics);
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void UpdateFrames();
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void VerticalAlignFrames(PerSpanData* psd);
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void PlaceTopBottomFrames(PerSpanData* psd,
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nscoord aDistanceFromTop,
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nscoord aLineHeight);
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void RelativePositionFrames(PerSpanData* psd, nsRect& aCombinedArea);
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#ifdef DEBUG
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void DumpPerSpanData(PerSpanData* psd, PRInt32 aIndent);
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#endif
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};
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#endif /* nsLineLayout_h___ */
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