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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 java.util.List;
import java.util.ListIterator;
import org.apache.fop.area.Trait;
import org.apache.fop.area.inline.FilledArea;
import org.apache.fop.area.inline.InlineArea;
import org.apache.fop.area.inline.Space;
import org.apache.fop.area.inline.TextArea;
import org.apache.fop.datatypes.Length;
import org.apache.fop.fo.Constants;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.flow.Inline;
import org.apache.fop.fo.flow.Leader;
import org.apache.fop.fo.flow.Wrapper;
import org.apache.fop.traits.MinOptMax;
import org.apache.fop.fo.LMVisited;
/**
* Visitor pattern for the purpose of adding
* Layout Managers to nodes in the FOTree.
* Each method is responsible to return a LayoutManager
* responsible for laying out this FObj's content.
*/
public class AddLMVisitor {
/** The List object to which methods in this class should add Layout
* Managers */
protected List currentLMList;
/** A List object which can be used to save and restore the currentLMList if
* another List should temporarily be used */
protected List saveLMList;
/**
*
* @param fobj the FObj object for which a layout manager should be created
* @param lmList the list to which the newly created layout manager(s)
* should be added
*/
public void addLayoutManager(FObj fobj, List lmList) {
/* Store the List in a global variable so that it can be accessed by the
Visitor methods */
currentLMList = lmList;
if (fobj instanceof LMVisited) {
((LMVisited) fobj).acceptVisitor(this);
} else {
fobj.addLayoutManager(currentLMList);
}
}
/**
* Accessor for the currentLMList.
* @return the currentLMList.
*/
public List getCurrentLMList() {
return currentLMList;
}
/**
* Accessor for the saveLMList.
* @return the saveLMList.
*/
public List getSaveLMList() {
return saveLMList;
}
/**
* @param node Wrapper object to process
*/
public void serveWrapper(Wrapper node) {
ListIterator baseIter;
baseIter = node.getChildNodes();
if (baseIter == null) return;
while (baseIter.hasNext()) {
FObj child = (FObj) baseIter.next();
if (child instanceof LMVisited) {
((LMVisited) child).acceptVisitor(this);
} else {
child.addLayoutManager(currentLMList);
}
}
}
public void serveLeader(final Leader node) {
LeafNodeLayoutManager lm = new LeafNodeLayoutManager(node) {
public InlineArea get(LayoutContext context) {
return getLeaderInlineArea(node, this);
}
protected MinOptMax getAllocationIPD(int refIPD) {
return getLeaderAllocIPD(node, refIPD);
}
/*protected void offsetArea(LayoutContext context) {
if(leaderPattern == LeaderPattern.DOTS) {
curArea.setOffset(context.getBaseline());
}
}*/
};
lm.setAlignment(node.getProperty(Constants.PR_LEADER_ALIGNMENT).getEnum());
currentLMList.add(lm);
}
public MinOptMax getLeaderAllocIPD(Leader node, int ipd) {
// length of the leader
int opt = node.getLength(Constants.PR_LEADER_LENGTH | Constants.CP_OPTIMUM, ipd);
int min = node.getLength(Constants.PR_LEADER_LENGTH | Constants.CP_MINIMUM, ipd);
int max = node.getLength(Constants.PR_LEADER_LENGTH | Constants.CP_MAXIMUM, ipd);
return new MinOptMax(min, opt, max);
}
private InlineArea getLeaderInlineArea(Leader node, LayoutManager parentLM) {
InlineArea leaderArea = null;
if (node.getLeaderPattern() == Constants.LeaderPattern.RULE) {
org.apache.fop.area.inline.Leader leader = new org.apache.fop.area.inline.Leader();
leader.setRuleStyle(node.getRuleStyle());
leader.setRuleThickness(node.getRuleThickness());
leaderArea = leader;
} else if (node.getLeaderPattern() == Constants.LeaderPattern.SPACE) {
leaderArea = new Space();
} else if (node.getLeaderPattern() == Constants.LeaderPattern.DOTS) {
TextArea t = new TextArea();
char dot = '.'; // userAgent.getLeaderDotCharacter();
t.setTextArea("" + dot);
t.addTrait(Trait.FONT_NAME, node.getFontState().getFontName());
t.addTrait(Trait.FONT_SIZE,
new Integer(node.getFontState().getFontSize()));
// set offset of dot within inline parent
t.setOffset(node.getFontState().getAscender());
int width = node.getFontState().getCharWidth(dot);
Space spacer = null;
if (node.getPatternWidth() > width) {
spacer = new Space();
spacer.setWidth(node.getPatternWidth() - width);
width = node.getPatternWidth();
}
FilledArea fa = new FilledArea();
fa.setUnitWidth(width);
fa.addChild(t);
if (spacer != null) {
fa.addChild(spacer);
}
fa.setHeight(node.getFontState().getAscender());
leaderArea = fa;
} else if (node.getLeaderPattern() == Constants.LeaderPattern.USECONTENT) {
if (node.getChildNodes() == null) {
node.getLogger().error("Leader use-content with no content");
return null;
}
InlineStackingLayoutManager lm;
lm = new InlineStackingLayoutManager(node);
lm.setLMiter(new LMiter(lm, node.getChildNodes()));
lm.initialize();
// get breaks then add areas to FilledArea
FilledArea fa = new FilledArea();
ContentLayoutManager clm = new ContentLayoutManager(fa);
clm.setParent(parentLM);
clm.setUserAgent(node.getUserAgent());
lm.setParent(clm);
clm.fillArea(lm);
int width = clm.getStackingSize();
Space spacer = null;
if (node.getPatternWidth() > width) {
spacer = new Space();
spacer.setWidth(node.getPatternWidth() - width);
width = node.getPatternWidth();
}
fa.setUnitWidth(width);
if (spacer != null) {
fa.addChild(spacer);
}
leaderArea = fa;
}
return leaderArea;
}
}
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