mirror of
https://github.com/mozilla/gecko-dev.git
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e0c71d1e53
Fix bugs 24186, 26996, and 26998 by reworking the quirks-mode line-height handling so that inline elements that do not have text as children (or meet a few other conditions that show the author wants real CSS support) will not increase the size of the line, but will be as close to their correct size as possible without enlarging the line. This fix includes emulation of the strange Nav4/IE quirk that a block's line-height is enforced on the first line of LI elements and the last line of LI, DD, and DT elements. Many of the changes are removing an earlier fix for 24186. r=buster
418 lines
11 KiB
C++
418 lines
11 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
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations 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
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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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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#include "nsLineBox.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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#define NS_LINELAYOUT_NUM_FRAMES 10
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#define NS_LINELAYOUT_NUM_SPANS 5
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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, nscoord aMinLineHeight,
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PRInt32 aLineNumber) {
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mBlockRS = aState;
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mMinLineHeight = aMinLineHeight;
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mLineNumber = aLineNumber;
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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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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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nsIFrame* aFloaterFrame);
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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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PRBool InStrictMode();
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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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// Reflows the frame and returns the reflow status. aPushedFrame is PR_TRUE
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// if the frame is pushed to the next line because it doesn't fit
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nsresult ReflowFrame(nsIFrame* aFrame,
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nsIFrame** aNextRCFrame,
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nsReflowStatus& aReflowStatus,
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nsHTMLReflowMetrics* aMetrics,
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PRBool& aPushedFrame);
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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(nsLineBox* aLineBox,
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nsSize& aMaxElementSizeResult);
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PRBool TrimTrailingWhiteSpace();
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PRBool HorizontalAlignFrames(nsRect& aLineBounds,
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PRBool aAllowJustify,
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PRBool aShrinkWrapWidth);
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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 SetTextStartsWithNBSP(PRBool aYes) {
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mTextStartsWithNBSP = aYes;
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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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PRBool GetLineEndsInBR() const { return mLineEndsInBR; }
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void SetLineEndsInBR(PRBool aOn) { mLineEndsInBR = aOn; }
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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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PRPackedBool 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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nsLineBox* mLineBox;
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PRPackedBool mEndsInWhiteSpace;
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PRPackedBool mUnderstandsWhiteSpace;
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PRPackedBool mTextStartsWithNBSP;
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PRPackedBool mFirstLetterStyleOK;
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PRPackedBool mIsTopOfPage;
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PRPackedBool mUpdatedBand;
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PRPackedBool mImpactedByFloaters;
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PRPackedBool mLastFloaterWasLetterFrame;
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PRPackedBool mCanPlaceFloater;
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PRPackedBool mKnowStrictMode;
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PRPackedBool mInStrictMode;
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PRPackedBool mLineEndsInBR;
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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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// Final computed line-height value after VerticalAlignFrames for
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// the block has been called.
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nscoord mFinalLineHeight;
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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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PRPackedBool mRelativePos;
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// Other state we use
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PRUint8 mVerticalAlign;
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PRPackedBool mIsTextFrame;
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PRPackedBool mIsNonEmptyTextFrame;
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PRPackedBool mIsNonWhitespaceTextFrame;
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PRPackedBool mIsLetterFrame;
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PRPackedBool mIsSticky;
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PerFrameData* Last() {
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PerFrameData* pfd = this;
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while (pfd->mNext) {
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pfd = pfd->mNext;
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}
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return pfd;
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}
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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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PRPackedBool mNoWrap;
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PRUint8 mDirection;
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PRPackedBool mChangedFrameDirection;
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PRPackedBool mZeroEffectiveSpanBox;
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PRPackedBool mContainsFloater;
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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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PRBool TrimTrailingWhiteSpaceIn(PerSpanData* psd, nscoord* aDeltaWidth);
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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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