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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: MainReference.java,v 1.2 2004/02/27 17:41:26 jeremias Exp $ */
package org.apache.fop.area;
import java.util.List;
import java.util.Iterator;
/**
* The main-reference-area generated by an fo:region-body
* This object holds one or more span-reference-areas (block-areas
* stacked in the block progression direction)
* See fo:region-body definition in the XSL Rec for more information.
*/
public class MainReference extends Area {
private BodyRegion parent;
private List spanAreas = new java.util.ArrayList();
private int width;
private boolean isEmpty = true;
/**
* Constructor
*
* @param parent the body region this reference area is placed in.
*/
public MainReference(BodyRegion parent) {
this.parent = parent;
addTrait(Trait.IS_REFERENCE_AREA, Boolean.TRUE);
}
/**
* Add a span area to this area.
*
* @param spanAll whether to make a single-column span
* @return the created span area.
*/
public Span createSpan(boolean spanAll) {
if (spanAreas.size() > 0 && getCurrentSpan().getBPD() == 0) {
//Remove the current one if it is empty
spanAreas.remove(spanAreas.size() - 1);
}
RegionViewport rv = parent.getRegionViewport();
int ipdWidth = (int) parent.getIPD()
- rv.getBorderAndPaddingWidthStart() - rv.getBorderAndPaddingWidthEnd();
Span newSpan = new Span(((spanAll) ? 1 : getColumnCount()),
getColumnGap(), ipdWidth);
spanAreas.add(newSpan);
return getCurrentSpan();
}
/**
* Get the span areas from this area.
*
* @return the list of span areas
*/
public List getSpans() {
return spanAreas;
}
/**
* Get the span area currently being filled (i.e., the last span created).
* @return the active span.
*/
public Span getCurrentSpan() {
return (Span) spanAreas.get(spanAreas.size() - 1);
}
/**
* Indicates whether any child areas have been added to this reference area.
*
* This is achieved by looping through each span.
* @return true if no child areas have been added yet.
*/
public boolean isEmpty() {
if (isEmpty) {
int areaCount = 0;
if (spanAreas != null) {
for (Iterator spaniter = spanAreas.iterator(); spaniter.hasNext();) {
Span spanArea = (Span) spaniter.next();
for (int i = 0; i < spanArea.getColumnCount(); i++) {
NormalFlow flow = spanArea.getNormalFlow(i);
if (flow != null) {
if (flow.getChildAreas() != null) {
areaCount += flow.getChildAreas().size();
}
}
}
}
}
isEmpty = (areaCount == 0);
}
return isEmpty;
}
/** @return the number of columns */
public int getColumnCount() {
return parent.getColumnCount();
}
/** @return the column gap in millipoints */
public int getColumnGap() {
return parent.getColumnGap();
}
/**
* Get the width of this reference area.
*
* @return the width
*/
public int getWidth() {
return width;
}
}
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