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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} */
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.addPtr(text, node.getPtr()); // used for accessibility
return text;
}
/** {@inheritDoc} */
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 returnList = new LinkedList();
returnList.add(seq);
setFinished(true);
return returnList;
}
/** {@inheritDoc} */
public String getWordChars(Position pos) {
return ((TextArea) curArea).getText();
}
/** {@inheritDoc} */
public void hyphenate(Position pos, HyphContext hc) {
if (hc.getNextHyphPoint() == 1) {
// the character ends a syllable
areaInfo.bHyphenated = true;
isSomethingChanged = 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} */
public boolean applyChanges(List oldList) {
setFinished(false);
return isSomethingChanged;
}
/** {@inheritDoc} */
public List getChangedKnuthElements(List oldList, int alignment) {
if (isFinished()) {
return null;
}
LinkedList returnList = new LinkedList();
addKnuthElementsForBorderPaddingStart(returnList);
if (letterSpaceIPD.isStiff() || areaInfo.iLScount == 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.bHyphenated) {
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.iLScount * 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.iLScount),
new LeafPosition(this, -1), true));
returnList.add
(new KnuthInlineBox(0, null, notifyPos(new LeafPosition(this, -1)), true));
if (areaInfo.bHyphenated) {
returnList.add(new KnuthPenalty(hyphIPD, KnuthPenalty.FLAGGED_PENALTY, true,
new LeafPosition(this, -1), false));
}
}
addKnuthElementsForBorderPaddingEnd(returnList);
setFinished(true);
return returnList;
}
}
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