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- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
- /* $Id$ */
-
- package org.apache.fop.layoutmgr.inline;
-
- import java.util.LinkedList;
- import java.util.List;
-
- import org.apache.fop.area.Trait;
- import org.apache.fop.area.inline.TextArea;
- import org.apache.fop.fo.flow.Character;
- import org.apache.fop.fo.properties.CommonBorderPaddingBackground;
- import org.apache.fop.fonts.Font;
- import org.apache.fop.fonts.FontSelector;
- import org.apache.fop.layoutmgr.InlineKnuthSequence;
- import org.apache.fop.layoutmgr.KnuthElement;
- import org.apache.fop.layoutmgr.KnuthGlue;
- import org.apache.fop.layoutmgr.KnuthPenalty;
- import org.apache.fop.layoutmgr.KnuthSequence;
- import org.apache.fop.layoutmgr.LayoutContext;
- import org.apache.fop.layoutmgr.LeafPosition;
- import org.apache.fop.layoutmgr.Position;
- import org.apache.fop.layoutmgr.TraitSetter;
- import org.apache.fop.traits.MinOptMax;
- import org.apache.fop.traits.SpaceVal;
- import org.apache.fop.util.CharUtilities;
-
- /**
- * LayoutManager for the fo:character formatting object
- */
- public class CharacterLayoutManager extends LeafNodeLayoutManager {
- private MinOptMax letterSpaceIPD;
- private int hyphIPD;
- private Font font;
- private CommonBorderPaddingBackground borderProps = null;
-
- /**
- * Constructor
- *
- * @param node the fo:character formatting object
- */
- public CharacterLayoutManager(Character node) {
- super(node);
- }
-
- /** {@inheritDoc} */
- @Override
- public void initialize() {
- Character fobj = (Character)this.fobj;
- font = FontSelector.selectFontForCharacter(fobj, this);
- SpaceVal ls = SpaceVal.makeLetterSpacing(fobj.getLetterSpacing());
- letterSpaceIPD = ls.getSpace();
- hyphIPD = fobj.getCommonHyphenation().getHyphIPD(font);
- borderProps = fobj.getCommonBorderPaddingBackground();
- setCommonBorderPaddingBackground(borderProps);
- TextArea chArea = getCharacterInlineArea(fobj);
- chArea.setBaselineOffset(font.getAscender());
- setCurrentArea(chArea);
- }
-
- private TextArea getCharacterInlineArea(Character node) {
- TextArea text = new TextArea();
- char ch = node.getCharacter();
- if (CharUtilities.isAnySpace(ch)) {
- // add space unless it's zero-width:
- if (!CharUtilities.isZeroWidthSpace(ch)) {
- text.addSpace(ch, 0, CharUtilities.isAdjustableSpace(ch));
- }
- } else {
- text.addWord(String.valueOf(ch), 0);
- }
- TraitSetter.setProducerID(text, node.getId());
- TraitSetter.addTextDecoration(text, node.getTextDecoration());
- TraitSetter.addStructureTreeElement(text, node.getStructureTreeElement());
- return text;
- }
-
- /** {@inheritDoc} */
- @Override
- public List getNextKnuthElements(LayoutContext context, int alignment) {
- MinOptMax ipd;
- curArea = get(context);
- KnuthSequence seq = new InlineKnuthSequence();
-
- if (curArea == null) {
- setFinished(true);
- return null;
- }
-
- Character fobj = (Character)this.fobj;
-
- ipd = MinOptMax.getInstance(font.getCharWidth(fobj.getCharacter()));
-
- curArea.setIPD(ipd.getOpt());
- curArea.setBPD(font.getAscender() - font.getDescender());
-
- TraitSetter.addFontTraits(curArea, font);
- curArea.addTrait(Trait.COLOR, fobj.getColor());
-
- // TODO: may need some special handling for fo:character
- alignmentContext = new AlignmentContext(font
- , font.getFontSize()
- , fobj.getAlignmentAdjust()
- , fobj.getAlignmentBaseline()
- , fobj.getBaselineShift()
- , fobj.getDominantBaseline()
- , context.getAlignmentContext());
-
- addKnuthElementsForBorderPaddingStart(seq);
-
- // create the AreaInfo object to store the computed values
- areaInfo = new AreaInfo((short) 0, ipd, false, alignmentContext);
-
- // node is a fo:Character
- if (letterSpaceIPD.isStiff()) {
- // constant letter space, only return a box
- seq.add(new KnuthInlineBox(areaInfo.ipdArea.getOpt(), areaInfo.alignmentContext,
- notifyPos(new LeafPosition(this, 0)), false));
- } else {
- // adjustable letter space, return a sequence of elements;
- // at the moment the character is supposed to have no letter spaces,
- // but returning this sequence allows us to change only one element
- // if addALetterSpaceTo() is called
- seq.add(new KnuthInlineBox(areaInfo.ipdArea.getOpt(), areaInfo.alignmentContext,
- notifyPos(new LeafPosition(this, 0)), false));
- seq.add(new KnuthPenalty(0, KnuthElement.INFINITE, false,
- new LeafPosition(this, -1), true));
- seq.add(new KnuthGlue(0, 0, 0,
- new LeafPosition(this, -1), true));
- seq.add(new KnuthInlineBox(0, null,
- notifyPos(new LeafPosition(this, -1)), true));
- }
-
- addKnuthElementsForBorderPaddingEnd(seq);
-
- LinkedList<KnuthSequence> returnList = new LinkedList<KnuthSequence>();
- returnList.add(seq);
- setFinished(true);
- return returnList;
- }
-
- /** {@inheritDoc} */
- @Override
- public String getWordChars(Position pos) {
- return ((TextArea) curArea).getText();
- }
-
- /** {@inheritDoc} */
- @Override
- public void hyphenate(Position pos, HyphContext hc) {
- if (hc.getNextHyphPoint() == 1) {
- // the character ends a syllable
- areaInfo.isHyphenated = true;
- somethingChanged = true;
- } else {
- // hc.getNextHyphPoint() returned -1 (no more hyphenation points)
- // or a number > 1;
- // the character does not end a syllable
- }
- hc.updateOffset(1);
- }
-
- /** {@inheritDoc} */
- @Override
- public boolean applyChanges(List oldList) {
- setFinished(false);
- return somethingChanged;
- }
-
- /** {@inheritDoc} */
- @Override
- public List getChangedKnuthElements(List oldList, int alignment) {
- if (isFinished()) {
- return null;
- }
-
- LinkedList<KnuthElement> returnList = new LinkedList<KnuthElement>();
-
- addKnuthElementsForBorderPaddingStart(returnList);
-
- if (letterSpaceIPD.isStiff() || areaInfo.letterSpaces == 0) {
- // constant letter space, or no letter space
- returnList.add(new KnuthInlineBox(areaInfo.ipdArea.getOpt(),
- areaInfo.alignmentContext,
- notifyPos(new LeafPosition(this, 0)), false));
- if (areaInfo.isHyphenated) {
- returnList.add(new KnuthPenalty(hyphIPD, KnuthPenalty.FLAGGED_PENALTY, true,
- new LeafPosition(this, -1), false));
- }
- } else {
- // adjustable letter space
- returnList.add(new KnuthInlineBox(areaInfo.ipdArea.getOpt()
- - areaInfo.letterSpaces * letterSpaceIPD.getOpt(), areaInfo.alignmentContext,
- notifyPos(new LeafPosition(this, 0)), false));
- returnList.add(new KnuthPenalty(0, KnuthElement.INFINITE, false,
- new LeafPosition(this, -1), true));
- returnList.add(new KnuthGlue(letterSpaceIPD.mult(areaInfo.letterSpaces),
- new LeafPosition(this, -1), true));
- returnList.add (
- new KnuthInlineBox(0, null, notifyPos(new LeafPosition(this, -1)), true));
- if (areaInfo.isHyphenated) {
- returnList.add(new KnuthPenalty(hyphIPD, KnuthPenalty.FLAGGED_PENALTY, true,
- new LeafPosition(this, -1), false));
- }
- }
-
- addKnuthElementsForBorderPaddingEnd(returnList);
-
- setFinished(true);
- return returnList;
- }
-
- }
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