diff options
Diffstat (limited to 'src/java/org')
| -rw-r--r-- | src/java/org/apache/fop/layoutmgr/inline/LineLayoutManager.java | 393 |
1 files changed, 191 insertions, 202 deletions
diff --git a/src/java/org/apache/fop/layoutmgr/inline/LineLayoutManager.java b/src/java/org/apache/fop/layoutmgr/inline/LineLayoutManager.java index b14293d89..aa6c4b862 100644 --- a/src/java/org/apache/fop/layoutmgr/inline/LineLayoutManager.java +++ b/src/java/org/apache/fop/layoutmgr/inline/LineLayoutManager.java @@ -949,7 +949,9 @@ public class LineLayoutManager extends InlineStackingLayoutManager while (paragraphsIterator.hasPrevious()) { KnuthSequence seq = (KnuthSequence) paragraphsIterator.previous(); if (!seq.isInlineSequence()) { - llPoss = createBlockLineBreak(seq); + // This set of line layout possibilities does not matter; + // we only need an entry in lineLayoutsList. + llPoss = new LineLayoutPossibilities(); } else { llPoss = findOptimalBreakingPoints(alignment, (Paragraph) seq); } @@ -963,39 +965,6 @@ public class LineLayoutManager extends InlineStackingLayoutManager } /** - * create a single line layout possibility with a single linebreak - * for a block sequence - * @param seq the Knuth sequence for which the linebreak is created - * @return the line layout possibilities for the paragraph - */ - private LineLayoutPossibilities createBlockLineBreak(KnuthSequence seq) { - //TODO Should this really create only a single LineBreakPosition??? - //This creates an implicit keep-together on the nested block-level FOs. - LineLayoutPossibilities llPoss = new LineLayoutPossibilities(); - llPoss.addPossibility(1, 0); - int localLineHeight = 0, lineStretch = 0, lineShrink = 0; - ListIterator seqIterator = seq.listIterator(); - while (seqIterator.hasNext()) { - ListElement elt = (ListElement) seqIterator.next(); - if (!(elt instanceof KnuthElement)) { - continue; - } - KnuthElement element = (KnuthElement) elt; - localLineHeight += element.getW(); - if (element.isGlue()) { - lineStretch += element.getY(); - lineShrink += element.getZ(); - } - } - LineBreakPosition lbp = new LineBreakPosition(this, - knuthParagraphs.indexOf(seq), 0, seq.size() - 1, - lineShrink, lineStretch, 0, 0, 0, 0, localLineHeight, - iLineWidth, 0, 0, 0); - llPoss.addBreakPosition(lbp, 0); - return llPoss; - } - - /** * Fint the optimal linebreaks for a paragraph * @param alignment alignment of the paragraph * @param currPar the Paragraph for which the linebreaks are found @@ -1654,184 +1623,204 @@ public class LineLayoutManager extends InlineStackingLayoutManager */ public void addAreas(PositionIterator parentIter, LayoutContext context) { - LayoutManager childLM; - LayoutContext lc = new LayoutContext(0); - lc.setAlignmentContext(alignmentContext); - int iCurrParIndex; while (parentIter.hasNext()) { Position pos = (Position) parentIter.next(); + boolean isLastPosition = !parentIter.hasNext(); if (pos instanceof LineBreakPosition) { - ListIterator seqIterator = null; - KnuthElement tempElement = null; - // the TLM which created the last KnuthElement in this line - LayoutManager lastLM = null; - - LineBreakPosition lbp = (LineBreakPosition) pos; - iCurrParIndex = lbp.iParIndex; - KnuthSequence seq = (KnuthSequence) knuthParagraphs.get(iCurrParIndex); - int iStartElement = lbp.iStartIndex; - int iEndElement = lbp.getLeafPos(); - - LineArea lineArea - = new LineArea((lbp.getLeafPos() < seq.size() - 1 - ? textAlignment : textAlignmentLast), - lbp.difference, lbp.availableStretch, lbp.availableShrink); - lineArea.setStartIndent(lbp.startIndent); - lineArea.setBPD(lbp.lineHeight); - lineArea.setIPD(lbp.lineWidth); - lineArea.addTrait(Trait.SPACE_BEFORE, new Integer(lbp.spaceBefore)); - lineArea.addTrait(Trait.SPACE_AFTER, new Integer(lbp.spaceAfter)); - alignmentContext.resizeLine(lbp.lineHeight, lbp.baseline); - - if (seq instanceof Paragraph) { - Paragraph currPar = (Paragraph) seq; - // ignore the first elements added by the LineLayoutManager - iStartElement += (iStartElement == 0) ? currPar.ignoreAtStart : 0; - - // if this is the last line area that for this paragraph, - // ignore the last elements added by the LineLayoutManager and - // subtract the last-line-end-indent from the area ipd - if (iEndElement == (currPar.size() - 1)) { - iEndElement -= currPar.ignoreAtEnd; - lineArea.setIPD(lineArea.getIPD() - lastLineEndIndent.getValue(this)); - } - } + addInlineArea(context, pos, isLastPosition); + } else if ((pos instanceof NonLeafPosition) && pos.generatesAreas()) { + addBlockArea(context, pos, isLastPosition); + } else { + /* + * pos was the Position inside a penalty item, nothing to do; + * or Pos does not generate an area, + * i.e. it stand for spaces, borders and padding. + */ + } + } + setCurrentArea(null); // ?? necessary + } + + /** + * Add a line with inline content + * @param context the context for adding areas + * @param pos the position for which the line is generated + * @param isLastPosition true if this is the last position of this LM + */ + private void addInlineArea(LayoutContext context, Position pos, boolean isLastPosition) { + ListIterator seqIterator = null; + KnuthElement tempElement = null; + // the TLM which created the last KnuthElement in this line + LayoutManager lastLM = null; + + LineBreakPosition lbp = (LineBreakPosition) pos; + int iCurrParIndex; + iCurrParIndex = lbp.iParIndex; + KnuthSequence seq = (KnuthSequence) knuthParagraphs.get(iCurrParIndex); + int iStartElement = lbp.iStartIndex; + int iEndElement = lbp.getLeafPos(); + + LineArea lineArea + = new LineArea((lbp.getLeafPos() < seq.size() - 1 + ? textAlignment : textAlignmentLast), + lbp.difference, lbp.availableStretch, lbp.availableShrink); + lineArea.setStartIndent(lbp.startIndent); + lineArea.setBPD(lbp.lineHeight); + lineArea.setIPD(lbp.lineWidth); + lineArea.addTrait(Trait.SPACE_BEFORE, new Integer(lbp.spaceBefore)); + lineArea.addTrait(Trait.SPACE_AFTER, new Integer(lbp.spaceAfter)); + alignmentContext.resizeLine(lbp.lineHeight, lbp.baseline); + + if (seq instanceof Paragraph) { + Paragraph currPar = (Paragraph) seq; + // ignore the first elements added by the LineLayoutManager + iStartElement += (iStartElement == 0) ? currPar.ignoreAtStart : 0; - // ignore the last element in the line if it is a KnuthGlue object - seqIterator = seq.listIterator(iEndElement); - tempElement = (KnuthElement) seqIterator.next(); - if (tempElement.isGlue()) { - iEndElement--; - // this returns the same KnuthElement - seqIterator.previous(); - tempElement = (KnuthElement) seqIterator.previous(); + // if this is the last line area that for this paragraph, + // ignore the last elements added by the LineLayoutManager and + // subtract the last-line-end-indent from the area ipd + if (iEndElement == (currPar.size() - 1)) { + iEndElement -= currPar.ignoreAtEnd; + lineArea.setIPD(lineArea.getIPD() - lastLineEndIndent.getValue(this)); } - lastLM = tempElement.getLayoutManager(); - - // ignore KnuthGlue and KnuthPenalty objects - // at the beginning of the line - seqIterator = seq.listIterator(iStartElement); + } + + // ignore the last element in the line if it is a KnuthGlue object + seqIterator = seq.listIterator(iEndElement); + tempElement = (KnuthElement) seqIterator.next(); + if (tempElement.isGlue()) { + iEndElement--; + // this returns the same KnuthElement + seqIterator.previous(); + tempElement = (KnuthElement) seqIterator.previous(); + } + lastLM = tempElement.getLayoutManager(); + + // ignore KnuthGlue and KnuthPenalty objects + // at the beginning of the line + seqIterator = seq.listIterator(iStartElement); + tempElement = (KnuthElement) seqIterator.next(); + while (!tempElement.isBox() && seqIterator.hasNext()) { tempElement = (KnuthElement) seqIterator.next(); - while (!tempElement.isBox() && seqIterator.hasNext()) { - tempElement = (KnuthElement) seqIterator.next(); - iStartElement++; - } - - // Add the inline areas to lineArea - PositionIterator inlinePosIter - = new KnuthPossPosIter(seq, iStartElement, - iEndElement + 1); - - iStartElement = lbp.getLeafPos() + 1; - if (iStartElement == seq.size()) { - // advance to next paragraph - iStartElement = 0; + iStartElement++; + } + + // Add the inline areas to lineArea + PositionIterator inlinePosIter + = new KnuthPossPosIter(seq, iStartElement, iEndElement + 1); + + iStartElement = lbp.getLeafPos() + 1; + if (iStartElement == seq.size()) { + // advance to next paragraph + iStartElement = 0; + } + + LayoutContext lc = new LayoutContext(0); + lc.setAlignmentContext(alignmentContext); + lc.setSpaceAdjust(lbp.dAdjust); + lc.setIPDAdjust(lbp.ipdAdjust); + lc.setLeadingSpace(new SpaceSpecifier(true)); + lc.setTrailingSpace(new SpaceSpecifier(false)); + lc.setFlags(LayoutContext.RESOLVE_LEADING_SPACE, true); + + /* + * extension (not in the XSL FO recommendation): if the left and right margins + * have been optimized, recompute indents and / or adjust ratio, according + * to the paragraph horizontal alignment + */ + if (false && textAlignment == EN_JUSTIFY) { + // re-compute space adjust ratio + int updatedDifference = context.getStackLimit().opt + - lbp.lineWidth + lbp.difference; + double updatedRatio = 0.0; + if (updatedDifference > 0) { + updatedRatio = (float) updatedDifference / lbp.availableStretch; + } else if (updatedDifference < 0) { + updatedRatio = (float) updatedDifference / lbp.availableShrink; } - - lc.setSpaceAdjust(lbp.dAdjust); - lc.setIPDAdjust(lbp.ipdAdjust); - lc.setLeadingSpace(new SpaceSpecifier(true)); + lc.setIPDAdjust(updatedRatio); + //log.debug("LLM.addAreas> old difference = " + lbp.difference + " new difference = " + updatedDifference); + //log.debug(" old ratio = " + lbp.ipdAdjust + " new ratio = " + updatedRatio); + } else if (false && textAlignment == EN_CENTER) { + // re-compute indent + int updatedIndent = lbp.startIndent + + (context.getStackLimit().opt - lbp.lineWidth) / 2; + lineArea.setStartIndent(updatedIndent); + } else if (false && textAlignment == EN_END) { + // re-compute indent + int updatedIndent = lbp.startIndent + + (context.getStackLimit().opt - lbp.lineWidth); + lineArea.setStartIndent(updatedIndent); + } + + setCurrentArea(lineArea); + setChildContext(lc); + LayoutManager childLM; + while ((childLM = inlinePosIter.getNextChildLM()) != null) { + lc.setFlags(LayoutContext.LAST_AREA, (childLM == lastLM)); + childLM.addAreas(inlinePosIter, lc); + lc.setLeadingSpace(lc.getTrailingSpace()); lc.setTrailingSpace(new SpaceSpecifier(false)); - lc.setFlags(LayoutContext.RESOLVE_LEADING_SPACE, true); - - /* extension (not in the XSL FO recommendation): if the left and right margins - have been optimized, recompute indents and / or adjust ratio, according - to the paragraph horizontal alignment */ - if (false && textAlignment == EN_JUSTIFY) { - // re-compute space adjust ratio - int updatedDifference = context.getStackLimit().opt - - lbp.lineWidth + lbp.difference; - double updatedRatio = 0.0; - if (updatedDifference > 0) { - updatedRatio = (float) updatedDifference / lbp.availableStretch; - } else if (updatedDifference < 0) { - updatedRatio = (float) updatedDifference / lbp.availableShrink; - } - lc.setIPDAdjust(updatedRatio); - //log.debug("LLM.addAreas> old difference = " + lbp.difference + " new difference = " + updatedDifference); - //log.debug(" old ratio = " + lbp.ipdAdjust + " new ratio = " + updatedRatio); - } else if (false && textAlignment == EN_CENTER) { - // re-compute indent - int updatedIndent = lbp.startIndent - + (context.getStackLimit().opt - lbp.lineWidth) / 2; - lineArea.setStartIndent(updatedIndent); - } else if (false && textAlignment == EN_END) { - // re-compute indent - int updatedIndent = lbp.startIndent - + (context.getStackLimit().opt - lbp.lineWidth); - lineArea.setStartIndent(updatedIndent); - } - - setCurrentArea(lineArea); - setChildContext(lc); - while ((childLM = inlinePosIter.getNextChildLM()) != null) { - lc.setFlags(LayoutContext.LAST_AREA, (childLM == lastLM)); - childLM.addAreas(inlinePosIter, lc); - lc.setLeadingSpace(lc.getTrailingSpace()); - lc.setTrailingSpace(new SpaceSpecifier(false)); - } - - // when can this be null? - // if display-align is distribute, add space after - if (context.getSpaceAfter() > 0 - && (!context.isLastArea() || parentIter.hasNext())) { - lineArea.setBPD(lineArea.getBPD() + context.getSpaceAfter()); - } - lineArea.finalise(); - parentLM.addChildArea(lineArea); - } else if (pos instanceof NonLeafPosition) { - // Nested block-level content; - // go down the LM stack again; - // collect all consecutive NonLeafPosition objects, - // "unwrap" them and put the child positions in a new list. - LinkedList positionList = new LinkedList(); - Position innerPosition; - innerPosition = ((NonLeafPosition) pos).getPosition(); - positionList.add(innerPosition); - while (parentIter.hasNext()) { - pos = (Position)parentIter.peekNext(); - if (!(pos instanceof NonLeafPosition)) { - break; - } - pos = (Position) parentIter.next(); - innerPosition = ((NonLeafPosition) pos).getPosition(); - positionList.add(innerPosition); - } - - // do we have the last LM? - LayoutManager lastLM = null; - if (!parentIter.hasNext()) { - lastLM = innerPosition.getLM(); - } - - // this may be wrong; not all areas belong inside a single line area - // see InlineStackingLM.addChildArea - LineArea lineArea = new LineArea(); - setCurrentArea(lineArea); - setChildContext(lc); - - PositionIterator childPosIter = new StackingIter(positionList.listIterator()); - LayoutContext blocklc = new LayoutContext(0); - blocklc.setLeadingSpace(new SpaceSpecifier(true)); - blocklc.setTrailingSpace(new SpaceSpecifier(false)); - blocklc.setFlags(LayoutContext.RESOLVE_LEADING_SPACE, true); - while ((childLM = childPosIter.getNextChildLM()) != null) { - // set last area flag - blocklc.setFlags(LayoutContext.LAST_AREA, - (context.isLastArea() && childLM == lastLM)); - blocklc.setStackLimit(context.getStackLimit()); - // Add the line areas to Area - childLM.addAreas(childPosIter, blocklc); - blocklc.setLeadingSpace(blocklc.getTrailingSpace()); - blocklc.setTrailingSpace(new SpaceSpecifier(false)); - } - lineArea.updateExtentsFromChildren(); - parentLM.addChildArea(lineArea); - } else { - // pos was the Position inside a penalty item, nothing to do } + + // when can this be null? + // if display-align is distribute, add space after + if (context.getSpaceAfter() > 0 + && (!context.isLastArea() || !isLastPosition)) { + lineArea.setBPD(lineArea.getBPD() + context.getSpaceAfter()); + } + lineArea.finalise(); + parentLM.addChildArea(lineArea); + } + + /** + * Add a line with block content + * @param context the context for adding areas + * @param pos the position for which the line is generated + * @param isLastPosition true if this is the last position of this LM + */ + private void addBlockArea(LayoutContext context, Position pos, boolean isLastPosition) { + /* Nested block-level content; + * go down the LM stack again; + * "unwrap" the positions and put the child positions in a new list. + * The positionList must contain one area-generating position, + * which creates one line area. + */ + List positionList = new ArrayList(1); + Position innerPosition; + innerPosition = ((NonLeafPosition) pos).getPosition(); + positionList.add(innerPosition); + + // do we have the last LM? + LayoutManager lastLM = null; + if (isLastPosition) { + lastLM = innerPosition.getLM(); } - setCurrentArea(null); // ?? necessary + + LineArea lineArea = new LineArea(); + setCurrentArea(lineArea); + LayoutContext lc = new LayoutContext(0); + lc.setAlignmentContext(alignmentContext); + setChildContext(lc); + + PositionIterator childPosIter = new StackingIter(positionList.listIterator()); + LayoutContext blocklc = new LayoutContext(0); + blocklc.setLeadingSpace(new SpaceSpecifier(true)); + blocklc.setTrailingSpace(new SpaceSpecifier(false)); + blocklc.setFlags(LayoutContext.RESOLVE_LEADING_SPACE, true); + LayoutManager childLM; + while ((childLM = childPosIter.getNextChildLM()) != null) { + // set last area flag + blocklc.setFlags(LayoutContext.LAST_AREA, + (context.isLastArea() && childLM == lastLM)); + blocklc.setStackLimit(context.getStackLimit()); + // Add the line areas to Area + childLM.addAreas(childPosIter, blocklc); + blocklc.setLeadingSpace(blocklc.getTrailingSpace()); + blocklc.setTrailingSpace(new SpaceSpecifier(false)); + } + lineArea.updateExtentsFromChildren(); + parentLM.addChildArea(lineArea); } /** |