| /* |
| * 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(); |
| } |
| |
| } |
| |