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/*
* Copyright 1999-2005 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.inline;
import org.apache.fop.fo.flow.PageNumber;
import org.apache.fop.area.inline.InlineArea;
import org.apache.fop.area.inline.TextArea;
import org.apache.fop.area.Trait;
import org.apache.fop.fonts.Font;
import org.apache.fop.layoutmgr.LayoutContext;
import org.apache.fop.layoutmgr.TraitSetter;
import org.apache.fop.traits.MinOptMax;
/**
* LayoutManager for the fo:page-number formatting object
*/
public class PageNumberLayoutManager extends LeafNodeLayoutManager {
private PageNumber fobj;
private Font font;
/**
* Constructor
*
* @param node the fo:page-number formatting object that creates the area
* @todo better null checking of node, font
*/
public PageNumberLayoutManager(PageNumber node) {
super(node);
fobj = node;
}
/** @see org.apache.fop.layoutmgr.inline.LeafNodeLayoutManager#get(LayoutContext) */
public void initialize() {
font = fobj.getCommonFont().getFontState(fobj.getFOEventHandler().getFontInfo(), this);
setCommonBorderPaddingBackground(fobj.getCommonBorderPaddingBackground());
}
/**
* @see org.apache.fop.layoutmgr.inline.LeafNodeLayoutManager
* #makeAlignmentContext(LayoutContext)
*/
protected AlignmentContext makeAlignmentContext(LayoutContext context) {
return new AlignmentContext(
font
, fobj.getLineHeight().getOptimum(this).getLength().getValue(this)
, fobj.getAlignmentAdjust()
, fobj.getAlignmentBaseline()
, fobj.getBaselineShift()
, fobj.getDominantBaseline()
, context.getAlignmentContext()
);
}
/** @see org.apache.fop.layoutmgr.inline.LeafNodeLayoutManager#get(LayoutContext) */
public InlineArea get(LayoutContext context) {
// get page string from parent, build area
TextArea text = new TextArea();
String str = getCurrentPV().getPageNumberString();
int width = getStringWidth(str);
text.addWord(str, 0);
text.setIPD(width);
text.setBPD(font.getAscender() - font.getDescender());
text.setBaselineOffset(font.getAscender());
TraitSetter.addFontTraits(text, font);
text.addTrait(Trait.COLOR, fobj.getColor());
TraitSetter.addTextDecoration(text, fobj.getTextDecoration());
return text;
}
/** @see org.apache.fop.layoutmgr.inline.LeafNodeLayoutManager#getEffectiveArea() */
protected InlineArea getEffectiveArea() {
TextArea baseArea = (TextArea)curArea;
//TODO Maybe replace that with a clone() call or better, a copy constructor
//TODO or even better: delay area creation until addAreas() stage
//TextArea is cloned because the LM is reused in static areas and the area can't be.
TextArea ta = new TextArea();
TraitSetter.setProducerID(ta, fobj.getId());
ta.setIPD(baseArea.getIPD());
ta.setBPD(baseArea.getBPD());
ta.setOffset(baseArea.getOffset());
ta.setBaselineOffset(baseArea.getBaselineOffset());
ta.addTrait(Trait.COLOR, fobj.getColor()); //only to initialize the trait map
ta.getTraits().putAll(baseArea.getTraits());
updateContent(ta);
return ta;
}
private void updateContent(TextArea area) {
// get the page number of the page actually being built
area.removeText();
area.addWord(getCurrentPV().getPageNumberString(), 0);
// update the ipd of the area
area.updateIPD(getStringWidth(area.getText()));
// update the width stored in the AreaInfo object
areaInfo.ipdArea = new MinOptMax(area.getIPD());
}
/**
* @param str string to be measured
* @return width of the string
*/
private int getStringWidth(String str) {
int width = 0;
for (int count = 0; count < str.length(); count++) {
width += font.getCharWidth(str.charAt(count));
}
return width;
}
/** @see org.apache.fop.layoutmgr.inline.LeafNodeLayoutManager#addId() */
protected void addId() {
getPSLM().addIDToPage(fobj.getId());
}
}
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