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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.PageNumberCitation;
import org.apache.fop.area.PageViewport;
import org.apache.fop.area.Resolvable;
import org.apache.fop.area.Trait;
import org.apache.fop.area.inline.InlineArea;
import org.apache.fop.area.inline.UnresolvedPageNumber;
import org.apache.fop.area.inline.TextArea;
import org.apache.fop.fonts.Font;
import org.apache.fop.layoutmgr.LayoutContext;
import org.apache.fop.layoutmgr.LayoutManager;
import org.apache.fop.layoutmgr.PositionIterator;
import org.apache.fop.layoutmgr.TraitSetter;
/**
* LayoutManager for the fo:page-number-citation formatting object
*/
public class PageNumberCitationLayoutManager extends LeafNodeLayoutManager {
private PageNumberCitation fobj;
/** Font for the page-number-citation */
protected Font font;
/** Indicates whether the page referred to by the citation has been resolved yet */
protected boolean resolved = false;
/**
* Constructor
*
* @param node the formatting object that creates this area
* @todo better retrieval of font info
*/
public PageNumberCitationLayoutManager(PageNumberCitation node) {
super(node);
fobj = node;
}
/** @see org.apache.fop.layoutmgr.LayoutManager#initialize */
public void initialize() {
font = fobj.getCommonFont().getFontState(fobj.getFOEventHandler().getFontInfo(), this);
setCommonBorderPaddingBackground(fobj.getCommonBorderPaddingBackground());
}
/**
* @see 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) {
curArea = getPageNumberCitationInlineArea(parentLM);
return curArea;
}
/**
* @see org.apache.fop.layoutmgr.inline.LeafNodeLayoutManager#addAreas(PositionIterator
* , LayoutContext)
*/
public void addAreas(PositionIterator posIter, LayoutContext context) {
super.addAreas(posIter, context);
if (!resolved) {
getPSLM().addUnresolvedArea(fobj.getRefId(), (Resolvable) curArea);
}
}
/**
* if id can be resolved then simply return a word, otherwise
* return a resolvable area
*/
private InlineArea getPageNumberCitationInlineArea(LayoutManager parentLM) {
PageViewport page = getPSLM().getFirstPVWithID(fobj.getRefId());
TextArea text = null;
if (page != null) {
String str = page.getPageNumberString();
// get page string from parent, build area
text = new TextArea();
int width = getStringWidth(str);
text.addWord(str, 0);
text.setIPD(width);
resolved = true;
} else {
resolved = false;
text = new UnresolvedPageNumber(fobj.getRefId(), font);
String str = "MMM"; // reserve three spaces for page number
int width = getStringWidth(str);
text.setIPD(width);
}
updateTextAreaTraits(text);
return text;
}
/**
* Updates the traits for the generated text area.
* @param text the text area
*/
protected void updateTextAreaTraits(TextArea text) {
TraitSetter.setProducerID(text, fobj.getId());
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());
}
/**
* @param str string to be measured
* @return width (in millipoints ??) of the string
*/
protected 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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