Examples of KnuthGlue

org.apache.fop.layoutmgr.KnuthGlue
An instance of this class represents a piece of content with adjustable width: for example a space between words of justified text. A KnuthGlue is a feasible breaking point only if it immediately follows a KnuthBox. The represented piece of content is suppressed if either the KnuthGlue is a chosen breaking point or there isn't any KnuthBox between the previous breaking point and the KnuthGlue itself. So, an unsuppressible piece of content with adjustable width, for example a leader or a word with adjustable letter space, cannot be represented by a single KnuthGlue; it can be represented using the sequence: KnuthBox(width = 0) KnuthPenalty(width = 0, penalty = infinity) KnuthGlue(...) KnuthBox(width = 0) where the infinity penalty avoids choosing the KnuthGlue as a breaking point and the 0-width KnuthBoxes prevent suppression. Besides the inherited methods and attributes, this class has two attributes used to store the stretchability (difference between max and opt width) and the shrinkability (difference between opt and min width), and the methods to get these values.

Examples of org.apache.fop.layoutmgr.KnuthGlue

                // the last character could be used as a line break
                // append new elements to oldList
                oldListIterator = oldList.listIterator(oldList.size());
                oldListIterator.add(new KnuthPenalty(0, KnuthPenalty.FLAGGED_PENALTY, true,
                                                     new LeafPosition(this, -1), false));
                oldListIterator.add(new KnuthGlue(letterSpaceIPD.opt,
                                           letterSpaceIPD.max - letterSpaceIPD.opt,
                                           letterSpaceIPD.opt - letterSpaceIPD.min,
                                           new LeafPosition(this, -1), false));
            } else if (letterSpaceIPD.min == letterSpaceIPD.max) {
                // constant letter space: replace the box
                oldListIterator.set(new KnuthInlineBox(ai.ipdArea.opt, alignmentContext, pos, false));
            } else {
                // adjustable letter space: replace the glue
                oldListIterator.next(); // this would return the penalty element
                oldListIterator.next(); // this would return the glue element
                oldListIterator.set(new KnuthGlue(ai.iLScount * letterSpaceIPD.opt,
                                                  ai.iLScount * (letterSpaceIPD.max - letterSpaceIPD.opt),
                                                  ai.iLScount * (letterSpaceIPD.opt - letterSpaceIPD.min),
                                                  new LeafPosition(this, -1), true));
            }
        }

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Examples of org.apache.fop.layoutmgr.KnuthGlue

                        // which forces a line break
                        lastPar.removeLast();
                        if (!lastPar.containsBox()) {
                            //only a forced linefeed on this line
                            //-> compensate with an auxiliary glue
                            lastPar.add(new KnuthGlue(ipd, 0, ipd, null, true));
                        }
                        lastPar.endParagraph();
                        ElementListObserver.observe(lastPar, "line", null);
                        lastPar = null;
                        if (log.isTraceEnabled()) {

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Examples of org.apache.fop.layoutmgr.KnuthGlue

        */


        if (lastLines != 0
            && (conditionalOptionalLines > 0 || conditionalEliminableLines > 0)) {
            breaker.add(new KnuthPenalty(0, KnuthElement.INFINITE, false, elementPosition, false));
            breaker.add(new KnuthGlue(0, -conditionalOptionalLines * constantLineHeight,
                                        -conditionalEliminableLines * constantLineHeight,
                                        Adjustment.LINE_NUMBER_ADJUSTMENT, elementPosition, false));
            breaker.add(new KnuthPenalty(conditionalOptionalLines * constantLineHeight,
                                           0, false, elementPosition, false));
            breaker.add(new KnuthGlue(0, conditionalOptionalLines * constantLineHeight,
                                        conditionalEliminableLines * constantLineHeight,
                                        Adjustment.LINE_NUMBER_ADJUSTMENT, elementPosition, false));
        } else if (lastLines != 0) {
            breaker.add(new KnuthPenalty(0, 0, false, elementPosition, false));
        }


        //log.debug("first=" + firstLines + " inner=" + innerLines
        //                   + " optional=" + optionalLines + " eliminable=" + eliminableLines
        //                   + " last=" + lastLines
        //                   + " (condOpt=" + conditionalOptionalLines + " condEl=" + conditionalEliminableLines + ")");


        // creation of the elements:
        // first group of lines
        list.add(new KnuthBox(firstLines * constantLineHeight, elementPosition,
                              (lastLines == 0
                               && conditionalOptionalLines == 0
                               && conditionalEliminableLines == 0)));
        if (conditionalOptionalLines > 0
            || conditionalEliminableLines > 0) {
            list.add(new KnuthPenalty(0, KnuthElement.INFINITE, false, elementPosition, false));
            list.add(new KnuthGlue(0, conditionalOptionalLines * constantLineHeight,
                                   conditionalEliminableLines * constantLineHeight,
                                   Adjustment.LINE_NUMBER_ADJUSTMENT, elementPosition, false));
            list.add(new KnuthBox(0, elementPosition, (lastLines == 0)));
        }


        // optional lines
        for (int i = 0; i < optionalLines; i++) {
            list.addAll(breaker);
            list.add(new KnuthBox(0, elementPosition, false));
            list.add(new KnuthPenalty(0, KnuthElement.INFINITE, false, elementPosition, false));
            list.add(new KnuthGlue(0, constantLineHeight, 0,
                                   Adjustment.LINE_NUMBER_ADJUSTMENT, elementPosition, false));
            list.add(new KnuthBox(0, elementPosition, false));
        }


        // eliminable lines
        for (int i = 0; i < eliminableLines; i++) {
            list.addAll(breaker);
            list.add(new KnuthBox(constantLineHeight, elementPosition, false));
            list.add(new KnuthPenalty(0, KnuthElement.INFINITE, false, elementPosition, false));
            list.add(new KnuthGlue(0, 0, constantLineHeight,
                                   Adjustment.LINE_NUMBER_ADJUSTMENT, elementPosition, false));
            list.add(new KnuthBox(0, elementPosition, false));
        }


        // inner lines

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Examples of org.apache.fop.layoutmgr.KnuthGlue

                p = -KnuthPenalty.INFINITE; //Overrides any keeps (see 4.8 in XSL 1.0)
                breakClass = nextBreakClass;
            }
            returnList.add(new BreakElement(penaltyPos, effPenaltyLen, p, breakClass, context));
            if (penaltyOrGlueLen < 0) {
                returnList.add(new KnuthGlue(-penaltyOrGlueLen, 0, 0, new Position(null), true));
            }


            laststep = step;
            step = getNextStep();
        } while (step >= 0);

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Examples of org.apache.fop.layoutmgr.KnuthGlue

        }
    }


    private KnuthSequence processLinebreak(List returnList, KnuthSequence sequence) {
        if (lineEndBAP != 0) {
            sequence.add(new KnuthGlue(lineEndBAP, 0, 0, auxiliaryPosition, true));
        }
        sequence.endSequence();
        sequence = new InlineKnuthSequence();
        returnList.add(sequence);
        return sequence;

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Examples of org.apache.fop.layoutmgr.KnuthGlue

                // the last character could be used as a line break
                // append new elements to oldList
                oldListIterator = oldList.listIterator(oldList.size());
                oldListIterator.add(new KnuthPenalty(0, KnuthPenalty.FLAGGED_PENALTY, true,
                        auxiliaryPosition, false));
                oldListIterator.add(new KnuthGlue(letterSpaceIPD, auxiliaryPosition, false));
            } else if (letterSpaceIPD.isStiff()) {
                // constant letter space: replace the box
                oldListIterator.set(new KnuthInlineBox(areaInfo.areaIPD.getOpt(),
                        alignmentContext, pos, false));
            } else {
                // adjustable letter space: replace the glue
                oldListIterator.next(); // this would return the penalty element
                oldListIterator.next(); // this would return the glue element
                oldListIterator.set(new KnuthGlue(letterSpaceIPD.mult(areaInfo.letterSpaceCount),
                        auxiliaryPosition, true));
            }
        }
        return oldList;
    }

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Examples of org.apache.fop.layoutmgr.KnuthGlue

            if (alignment == Constants.EN_JUSTIFY) {
                // the space can stretch and shrink, and must be preserved
                // when starting a line
                baseList.add(makeAuxiliaryZeroWidthBox());
                baseList.add(makeZeroWidthPenalty(KnuthElement.INFINITE));
                baseList.add(new KnuthGlue(areaInfo.areaIPD, mainPosition, false));
            } else {
                // the space does not need to stretch or shrink, and must be
                // preserved when starting a line
                baseList.add(new KnuthInlineBox(areaInfo.areaIPD.getOpt(), null, mainPosition,
                        true));

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Examples of org.apache.fop.layoutmgr.KnuthGlue

        case EN_CENTER:
            // centered text:
            // if the second element is chosen as a line break these elements
            // add a constant amount of stretch at the end of a line and at the
            // beginning of the next one, otherwise they don't add any stretch
            elements.add(new KnuthGlue(lineEndBAP, 3 * LineLayoutManager.DEFAULT_SPACE_WIDTH, 0,
                    auxiliaryPosition, false));
            elements.add(makeZeroWidthPenalty(0));
            elements.add(new KnuthGlue(p2WidthOffset - (lineStartBAP + lineEndBAP), -6
                    * LineLayoutManager.DEFAULT_SPACE_WIDTH, 0, pos2, false));
            elements.add(makeAuxiliaryZeroWidthBox());
            elements.add(makeZeroWidthPenalty(KnuthElement.INFINITE));
            elements.add(new KnuthGlue(lineStartBAP + p3WidthOffset,
                    3 * LineLayoutManager.DEFAULT_SPACE_WIDTH, 0, pos3, false));
            break;


        case EN_START: // fall through
        case EN_END:
            // left- or right-aligned text:
            // if the second element is chosen as a line break these elements
            // add a constant amount of stretch at the end of a line, otherwise
            // they don't add any stretch
            if (skipZeroCheck || lineStartBAP != 0 || lineEndBAP != 0) {
                elements.add(new KnuthGlue(lineEndBAP, 3 * LineLayoutManager.DEFAULT_SPACE_WIDTH, 0, auxiliaryPosition, false));
                elements.add(makeZeroWidthPenalty(0));
                elements.add(new KnuthGlue(p2WidthOffset - (lineStartBAP + lineEndBAP), -3 * LineLayoutManager.DEFAULT_SPACE_WIDTH, 0, pos2, false));
                elements.add(makeAuxiliaryZeroWidthBox());
                elements.add(makeZeroWidthPenalty(KnuthElement.INFINITE));
                elements.add(new KnuthGlue(lineStartBAP + p3WidthOffset, 0, 0, pos3, false));
            } else {
                elements.add(new KnuthGlue(0, 3 * LineLayoutManager.DEFAULT_SPACE_WIDTH, 0, auxiliaryPosition, false));
                elements.add(makeZeroWidthPenalty(0));
                elements.add(new KnuthGlue(areaInfo.areaIPD.getOpt(), -3 * LineLayoutManager.DEFAULT_SPACE_WIDTH, 0, pos2, false));
            }
            break;


        case EN_JUSTIFY:
            // justified text:

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Examples of org.apache.fop.layoutmgr.KnuthGlue


        int stretchability = areaInfo.areaIPD.getStretch();


        List elements = new ArrayList();
        if (skipZeroCheck || lineStartBAP != 0 || lineEndBAP != 0) {
            elements.add(new KnuthGlue(lineEndBAP, 0, 0, auxiliaryPosition, false));
            elements.add(makeZeroWidthPenalty(0));
            elements.add(new KnuthGlue(p2WidthOffset - (lineStartBAP + lineEndBAP),
                    stretchability, shrinkability, pos2, false));
            elements.add(makeAuxiliaryZeroWidthBox());
            elements.add(makeZeroWidthPenalty(KnuthElement.INFINITE));
            elements.add(new KnuthGlue(lineStartBAP + p3WidthOffset, 0, 0, pos3, false));
        } else {
            elements.add(new KnuthGlue(areaInfo.areaIPD.getOpt(), stretchability, shrinkability,
                    pos2, false));
        }
        return elements;
    }

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Examples of org.apache.fop.layoutmgr.KnuthGlue

                    : areaInfo.letterSpaceCount;
            baseList.add(new KnuthInlineBox(areaInfo.areaIPD.getOpt()
                    - areaInfo.letterSpaceCount * letterSpaceIPD.getOpt(),
                            alignmentContext, notifyPos(mainPosition), false));
            baseList.add(makeZeroWidthPenalty(KnuthElement.INFINITE));
            baseList.add(new KnuthGlue(letterSpaceIPD.mult(unsuppressibleLetterSpaces),
                    auxiliaryPosition, true));
            baseList.add(makeAuxiliaryZeroWidthBox());
        }


        // extra-elements if the word fragment is the end of a syllable,

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