Examples of org.apache.fop.layoutmgr.KnuthElement

org.apache.fop.layoutmgr.KnuthElement
This is the super class for KnuthBox, KnuthGlue and KnuthPenalty. It stores information common to all sub classes, and the methods to get it: the width, a Position and a boolean marking KnuthElements used for some special feature (for example, the additional elements used to represent a space when text alignment is right, left or center).

    /** {@inheritDoc} */
    public List addALetterSpaceTo(List oldList, int thisDepth) {
        // old list contains only a box, or the sequence: box penalty glue box


        ListIterator oldListIterator = oldList.listIterator(oldList.size());
        KnuthElement element = (KnuthElement) oldListIterator.previous();
        int depth = thisDepth + 1;


        // The last element may not have a layout manager (its position == null);
        // this may happen if it is a padding box; see bug 39571.
        Position pos = element.getPosition();
        InlineLevelLayoutManager lm = null;
        if (pos != null) {
            lm = (InlineLevelLayoutManager) pos.getLM(depth);
        }
        if (lm == null) {
            return oldList;
        }
        oldList = lm.addALetterSpaceTo(oldList, depth);
        // "wrap" the Position stored in new elements of oldList
        oldListIterator = oldList.listIterator();
        while (oldListIterator.hasNext()) {
            element = (KnuthElement) oldListIterator.next();
            pos = element.getPosition();
            lm = null;
            if (pos != null) {
                lm = (InlineLevelLayoutManager) pos.getLM(thisDepth);
            }
            // in old elements the position at thisDepth is a position for this LM
            // only wrap new elements
            if (lm != this) {
                // new element, wrap position
                element.setPosition(notifyPos(new NonLeafPosition(this, element.getPosition())));
            }
        }


        return oldList;
    }

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    }


    /** {@inheritDoc} */
    public boolean applyChanges(List oldList, int depth) {
        ListIterator oldListIterator = oldList.listIterator();
        KnuthElement oldElement;
        depth += 1;


        InlineLevelLayoutManager prevLM = null;
        InlineLevelLayoutManager currLM;
        int fromIndex = 0;


        boolean bSomethingChanged = false;
        while (oldListIterator.hasNext()) {
            oldElement = (KnuthElement) oldListIterator.next();
            Position pos = oldElement.getPosition();
            if (pos == null) {
                currLM = null;
            } else {
                currLM = (InlineLevelLayoutManager) pos.getLM(depth);
            }

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    /** {@inheritDoc} */
    public List getChangedKnuthElements(List oldList, int alignment, int depth) {
        // "unwrap" the Positions stored in the elements
        ListIterator oldListIterator = oldList.listIterator();
        KnuthElement oldElement;
        depth += 1;


        KnuthElement returnedElement;
        LinkedList returnedList = new LinkedList();
        LinkedList returnList = new LinkedList();
        InlineLevelLayoutManager prevLM = null;
        InlineLevelLayoutManager currLM;
        int fromIndex = 0;


        while (oldListIterator.hasNext()) {
            oldElement = (KnuthElement) oldListIterator.next();
            Position pos = oldElement.getPosition();
            if (pos == null) {
                currLM = null;
            } else {
                currLM = (InlineLevelLayoutManager) pos.getLM(depth);
            }
            if (prevLM == null) {
                prevLM = currLM;
            }


            if (currLM != prevLM || !oldListIterator.hasNext()) {
                if (oldListIterator.hasNext()) {
                    returnedList.addAll
                        (prevLM.getChangedKnuthElements
                         (oldList.subList(fromIndex, oldListIterator.previousIndex()),
                          alignment, depth));
                    prevLM = currLM;
                    fromIndex = oldListIterator.previousIndex();
                } else if (currLM == prevLM) {
                    returnedList.addAll
                        (prevLM.getChangedKnuthElements
                         (oldList.subList(fromIndex, oldList.size()),
                          alignment, depth));
                } else {
                    returnedList.addAll
                        (prevLM.getChangedKnuthElements
                         (oldList.subList(fromIndex, oldListIterator.previousIndex()),
                          alignment, depth));
                    if (currLM != null) {
                        returnedList.addAll
                            (currLM.getChangedKnuthElements
                             (oldList.subList(oldListIterator.previousIndex(), oldList.size()),
                              alignment, depth));
                    }
                }
            }
        }


        // this is a new list
        // "wrap" the Position stored in each element of returnedList
        ListIterator listIter = returnedList.listIterator();
        while (listIter.hasNext()) {
            returnedElement = (KnuthElement) listIter.next();
            returnedElement.setPosition
                (notifyPos(new NonLeafPosition(this, returnedElement.getPosition())));
            returnList.add(returnedElement);
        }


        return returnList;
    }

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        ListIterator citationIterator = citationList.listIterator(citationList.size());
        while (citationIterator.hasPrevious() && lastBox == null) {
            Object obj = citationIterator.previous();
            if (obj instanceof KnuthElement) {
                // obj is an element
                KnuthElement element = (KnuthElement)obj;
                if (element instanceof KnuthInlineBox) {
                    lastBox = (KnuthInlineBox) element;
                }
            } else {
                // obj is a sequence of elements
                KnuthSequence seq = (KnuthSequence)obj;
                ListIterator nestedIterator = seq.listIterator(seq.size());
                while (nestedIterator.hasPrevious() && lastBox == null) {
                    KnuthElement element = (KnuthElement)nestedIterator.previous();
                    if (element instanceof KnuthInlineBox && !element.isAuxiliary()
                            || element == forcedAnchor) {
                        lastBox = (KnuthInlineBox) element;
                    }
                }
            }

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        /**
         * @return true if the sequence contains a box
         */
        public boolean containsBox() {
            for (int i = 0; i < this.size(); i++) {
                KnuthElement el = (KnuthElement)this.get(i);
                if (el.isBox()) {
                    return true;
                }
            }
            return false;
        }

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                AlignmentContext lastAC = null;
                int maxIgnoredHeight = 0; // See spec 7.13
                for (int j = firstElementIndex;
                     j <= lastElementIndex;
                     j++) {
                    KnuthElement element = (KnuthElement) inlineIterator.next();
                    if (element instanceof KnuthInlineBox ) {
                        AlignmentContext ac = ((KnuthInlineBox) element).getAlignmentContext();
                        if (ac != null && lastAC != ac) {
                            if (!ac.usesInitialBaselineTable()
                                || ac.getAlignmentBaselineIdentifier() != EN_BEFORE_EDGE
                                   && ac.getAlignmentBaselineIdentifier() != EN_AFTER_EDGE) {
                                if (fobj.getLineHeightShiftAdjustment() == EN_CONSIDER_SHIFTS
                                    || ac.getBaselineShiftValue() == 0) {
                                    int alignmentOffset = ac.getTotalAlignmentBaselineOffset();
                                    if (alignmentOffset + ac.getAltitude() > lineLead) {
                                        lineLead = alignmentOffset + ac.getAltitude();
                                    }
                                    if (ac.getDepth() - alignmentOffset > lineFollow)  {
                                        lineFollow = ac.getDepth() - alignmentOffset;
                                    }
                                }
                            } else {
                                if (ac.getHeight() > maxIgnoredHeight) {
                                    maxIgnoredHeight = ac.getHeight();
                                }
                            }
                            lastAC = ac;
                        }
                        if (isZeroHeightLine
                            && (!element.isAuxiliary() || ac != null && ac.getHeight() > 0)) {
                            isZeroHeightLine = false;
                        }
                    }
                }

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                - totalHeight;


            //Additional penalty height from penalties in the source lists
            int additionalPenaltyHeight = 0;
            int stepPenalty = 0;
            KnuthElement endEl = (KnuthElement)elementLists[0].get(end[0]);
            if (endEl instanceof KnuthPenalty) {
                additionalPenaltyHeight = endEl.getWidth();
                stepPenalty = Math.max(stepPenalty, endEl.getPenalty());
            }
            endEl = (KnuthElement)elementLists[1].get(end[1]);
            if (endEl instanceof KnuthPenalty) {
                additionalPenaltyHeight = Math.max(
                        additionalPenaltyHeight, endEl.getWidth());
                stepPenalty = Math.max(stepPenalty, endEl.getPenalty());
            }


            int boxHeight = step - addedBoxHeight - penaltyHeight;
            penaltyHeight += additionalPenaltyHeight; //Add AFTER calculating boxHeight!

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        // get next possible sequence for label and body
        int seqCount = 0;
        for (int i = 0; i < start.length; i++) {
            while (end[i] + 1 < elementLists[i].size()) {
                end[i]++;
                KnuthElement el = (KnuthElement)elementLists[i].get(end[i]);
                if (el.isPenalty()) {
                    if (el.getPenalty() < KnuthElement.INFINITE) {
                        //First legal break point
                        break;
                    }
                } else if (el.isGlue()) {
                    if (end[i] > 0) {
                        KnuthElement prev = (KnuthElement)elementLists[i].get(end[i] - 1);
                        if (prev.isBox()) {
                            //Second legal break point
                            break;
                        }
                    }
                    partialHeights[i] += el.getWidth();

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        labelList = label.getChangedKnuthElements(labelList, alignment);


        // body
        // "unwrap" the Positions stored in the elements
        ListIterator oldListIterator = oldList.listIterator();
        KnuthElement oldElement;
        while (oldListIterator.hasNext()) {
            oldElement = (KnuthElement)oldListIterator.next();
            Position innerPosition = oldElement.getPosition().getPosition();
            if (innerPosition != null) {
                // oldElement was created by a descendant of this BlockLM
                oldElement.setPosition(innerPosition);
            } else {
                // thisElement was created by this BlockLM
                // modify its position in order to recognize it was not created
                // by a child
                oldElement.setPosition(new Position(this));
            }
        }


        List returnedList = body.getChangedKnuthElements(oldList, alignment);
        // "wrap" the Position inside each element
        List tempList = returnedList;
        KnuthElement tempElement;
        returnedList = new LinkedList();
        ListIterator listIter = tempList.listIterator();
        while (listIter.hasNext()) {
            tempElement = (KnuthElement)listIter.next();
            tempElement.setPosition(new NonLeafPosition(this, tempElement.getPosition()));
            returnedList.add(tempElement);
        }


        return returnedList;
    }

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        if (((KnuthElement) returnList.get(0)).isForcedBreak()) {
            primaryGridUnit.setBreakBefore(((KnuthPenalty) returnList.get(0)).getBreakClass());
            returnList.remove(0);
            assert !returnList.isEmpty();
        }
        final KnuthElement lastItem = (KnuthElement) ListUtil
                .getLast(returnList);
        if (lastItem.isForcedBreak()) {
            KnuthPenalty p = (KnuthPenalty) lastItem;
            primaryGridUnit.setBreakAfter(p.getBreakClass());
            p.setPenalty(0);
        }

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