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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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;
import org.apache.fop.fo.flow.Character;
import org.apache.fop.fo.TextInfo;
import org.apache.fop.area.inline.InlineArea;
import org.apache.fop.area.Trait;
import org.apache.fop.traits.MinOptMax;
import org.apache.fop.traits.SpaceVal;
import java.util.List;
import java.util.LinkedList;
/**
* LayoutManager for the fo:character formatting object
*/
public class CharacterLayoutManager extends LeafNodeLayoutManager {
private MinOptMax letterSpaceIPD;
private int hyphIPD;
private TextInfo textInfo;
/**
* Constructor
*
* @param node the fo:character formatting object
* @todo better null checking of node
*/
public CharacterLayoutManager(Character node) {
super(node);
InlineArea inline = getCharacterInlineArea(node);
setCurrentArea(inline);
textInfo = node.getPropertyManager().getTextLayoutProps
(node.getFOInputHandler().getFontInfo());
SpaceVal ls = textInfo.letterSpacing;
letterSpaceIPD = new MinOptMax(ls.getSpace().min,
ls.getSpace().opt,
ls.getSpace().max);
hyphIPD = textInfo.fs.getCharWidth(textInfo.hyphChar);
}
private InlineArea getCharacterInlineArea(Character node) {
String str = node.getProperty(Character.PR_CHARACTER).getString();
org.apache.fop.area.inline.Character ch =
new org.apache.fop.area.inline.Character(str.charAt(0));
return ch;
}
/**
* Offset this area.
* Offset the inline area in the bpd direction when adding the
* inline area.
* This is used for vertical alignment.
* Subclasses should override this if necessary.
* @param context the layout context used for adding the area
*/
protected void offsetArea(LayoutContext context) {
int bpd = curArea.getHeight();
switch (alignment) {
case VerticalAlign.MIDDLE:
curArea.setOffset(context.getBaseline() - bpd / 2 /* - fontLead/2 */);
break;
case VerticalAlign.TOP:
//curArea.setOffset(0);
break;
case VerticalAlign.BOTTOM:
curArea.setOffset(context.getLineHeight() - bpd);
break;
case VerticalAlign.BASELINE:
default:
curArea.setOffset(context.getBaseline());
break;
}
}
public LinkedList getNextKnuthElements(LayoutContext context,
int alignment) {
MinOptMax ipd;
curArea = get(context);
LinkedList returnList = new LinkedList();
if (curArea == null) {
setFinished(true);
return null;
}
ipd = new MinOptMax(textInfo.fs.getCharWidth(((org.apache.fop.area.inline.Character) curArea).getChar().charAt(0)));
curArea.setIPD(ipd.opt);
curArea.setWidth(ipd.opt);
curArea.setHeight(textInfo.fs.getAscender()
- textInfo.fs.getDescender());
// offset is set in the offsetArea() method
//curArea.setOffset(textInfo.fs.getAscender());
//curArea.setOffset(context.getBaseline());
curArea.addTrait(Trait.FONT_NAME, textInfo.fs.getFontName());
curArea.addTrait(Trait.FONT_SIZE,
new Integer(textInfo.fs.getFontSize()));
curArea.addTrait(Trait.COLOR, textInfo.color);
int bpd = curArea.getHeight();
int lead = 0;
int total = 0;
int middle = 0;
switch (alignment) {
case VerticalAlign.MIDDLE : middle = bpd / 2 ;
lead = bpd / 2 ;
break;
case VerticalAlign.TOP : total = bpd;
break;
case VerticalAlign.BOTTOM : total = bpd;
break;
case VerticalAlign.BASELINE:
default: lead = bpd;
break;
}
// create the AreaInfo object to store the computed values
areaInfo = new AreaInfo((short) 0, ipd, false,
lead, total, middle);
// node is a fo:Character
if (letterSpaceIPD.min == letterSpaceIPD.max) {
// constant letter space, only return a box
returnList.add(new KnuthBox(areaInfo.ipdArea.opt, areaInfo.lead,
areaInfo.total, areaInfo.middle,
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
returnList.add(new KnuthBox(areaInfo.ipdArea.opt, areaInfo.lead,
areaInfo.total, areaInfo.middle,
new LeafPosition(this, 0), false));
returnList.add(new KnuthPenalty(0, KnuthElement.INFINITE, false,
new LeafPosition(this, -1), true));
returnList.add(new KnuthGlue(0, 0, 0,
new LeafPosition(this, -1), true));
returnList.add(new KnuthBox(0, 0, 0, 0,
new LeafPosition(this, -1), true));
}
setFinished(true);
return returnList;
}
public void getWordChars(StringBuffer sbChars, Position bp) {
sbChars.append
(((org.apache.fop.area.inline.Character) curArea).getChar());
}
public KnuthElement addALetterSpaceTo(KnuthElement element) {
areaInfo.iLScount ++;
areaInfo.ipdArea.add(letterSpaceIPD);
if (letterSpaceIPD.min == letterSpaceIPD.max) {
// constant letter space, return a new box
return new KnuthBox(areaInfo.ipdArea.opt, areaInfo.lead,
areaInfo.total, areaInfo.middle,
new LeafPosition(this, 0), false);
} else {
// adjustable letter space, return a new glue
return new KnuthGlue(letterSpaceIPD.opt,
letterSpaceIPD.max - letterSpaceIPD.opt,
letterSpaceIPD.opt - letterSpaceIPD.min,
new LeafPosition(this, -1), true);
}
}
public void hyphenate(Position pos, HyphContext hc) {
if (hc.getNextHyphPoint() == 1) {
// the character ends a syllable
areaInfo.bHyphenated = true;
bSomethingChanged = true;
} else {
// hc.getNextHyphPoint() returned -1 (no more hyphenation points)
// or a number > 1;
// the character does not end a syllable
}
hc.updateOffset(1);
}
public boolean applyChanges(List oldList) {
setFinished(false);
if (bSomethingChanged) {
// there is nothing to do,
// possible changes have already been applied
// in the hyphenate() method
return true;
} else {
return false;
}
}
public LinkedList getChangedKnuthElements(List oldList,
int flaggedPenalty,
int alignment) {
if (isFinished()) {
return null;
}
LinkedList returnList = new LinkedList();
if (letterSpaceIPD.min == letterSpaceIPD.max
|| areaInfo.iLScount == 0) {
// constant letter space, or no letter space
returnList.add(new KnuthBox(areaInfo.ipdArea.opt, areaInfo.lead,
areaInfo.total, areaInfo.middle,
new LeafPosition(this, 0), false));
if (areaInfo.bHyphenated) {
returnList.add
(new KnuthPenalty(hyphIPD, flaggedPenalty, true,
new LeafPosition(this, -1), false));
}
} else {
// adjustable letter space
returnList.add
(new KnuthBox(areaInfo.ipdArea.opt
- areaInfo.iLScount * letterSpaceIPD.opt,
areaInfo.lead, areaInfo.total, areaInfo.middle,
new LeafPosition(this, 0), false));
returnList.add(new KnuthPenalty(0, KnuthElement.INFINITE, false,
new LeafPosition(this, -1), true));
returnList.add
(new KnuthGlue(areaInfo.iLScount * letterSpaceIPD.opt,
areaInfo.iLScount * letterSpaceIPD.max - letterSpaceIPD.opt,
areaInfo.iLScount * letterSpaceIPD.opt - letterSpaceIPD.min,
new LeafPosition(this, -1), true));
returnList.add(new KnuthBox(0, 0, 0, 0,
new LeafPosition(this, -1), true));
if (areaInfo.bHyphenated) {
returnList.add
(new KnuthPenalty(hyphIPD, flaggedPenalty, true,
new LeafPosition(this, -1), false));
}
}
setFinished(true);
return returnList;
}
}
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