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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.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 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().isEmpty()) {
//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) {
boolean nonEmptyFound = false;
if (spanAreas != null) {
for (Iterator spaniter = spanAreas.iterator(); spaniter.hasNext();) {
Span spanArea = (Span) spaniter.next();
nonEmptyFound |= !spanArea.isEmpty();
}
}
isEmpty = !nonEmptyFound;
}
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();
}
}
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