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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;
/**
* The span-reference-area.
* This is a block-area with 0 border and padding that is stacked
* within the main-reference-area
* This object holds one or more normal-flow-reference-area children
* based on the column-count trait in effect for this span.
* See fo:region-body definition in the XSL Rec for more information.
*/
public class Span extends Area {
// the list of flow reference areas in this span area
private List flowAreas;
private int colCount;
private int colGap;
private int colWidth; // width for each normal flow, calculated value
private int curFlowIdx; // n-f-r-a currently being processed, zero-based
/**
* Create a span area with the number of columns for this span area.
*
* @param colCount the number of columns in the span
* @param colGap the column gap between each column
* @param ipd the total ipd of the span
*/
public Span(int colCount, int colGap, int ipd) {
addTrait(Trait.IS_REFERENCE_AREA, Boolean.TRUE);
this.colCount = colCount;
this.colGap = colGap;
this.ipd = ipd;
curFlowIdx = 0;
createNormalFlows();
}
/**
* Create the normal flows for this Span
*/
private void createNormalFlows() {
flowAreas = new java.util.ArrayList(colCount);
colWidth = (ipd - ((colCount - 1) * colGap)) / colCount;
for (int i = 0; i < colCount; i++) {
NormalFlow newFlow = new NormalFlow(colWidth);
flowAreas.add(newFlow);
}
}
/**
* Get the column count for this span area.
*
* @return the number of columns defined for this span area
*/
public int getColumnCount() {
return colCount;
}
/**
* Get the width of a single column within this Span
*
* @return the width of a single column
*/
public int getColumnWidth() {
return colWidth;
}
/**
* Get the height of this span area.
*
* @return the height of this span area
*/
public int getHeight() {
return getBPD();
}
/**
* Get the normal flow area for a particular column.
*
* @param colRequested the zero-based column number of the flow
* @return the flow area for the requested column
*/
public NormalFlow getNormalFlow(int colRequested) {
if (colRequested >= 0 && colRequested < colCount) {
return (NormalFlow) flowAreas.get(colRequested);
} else { // internal error
throw new IllegalArgumentException("Invalid column number "
+ colRequested + " requested; only 0-" + (colCount - 1)
+ " available.");
}
}
/**
* Get the NormalFlow area currently being processed
*
* @return the current NormalFlow
*/
public NormalFlow getCurrentFlow() {
return getNormalFlow(curFlowIdx);
}
/** @return the index of the current normal flow */
public int getCurrentFlowIndex() {
return curFlowIdx;
}
/**
* Indicate to the Span that the next column is being
* processed.
*
* @return the new NormalFlow (in the next column)
*/
public NormalFlow moveToNextFlow() {
if (hasMoreFlows()) {
curFlowIdx++;
return getNormalFlow(curFlowIdx);
} else {
throw new IllegalStateException("(Internal error.) No more flows left in span.");
}
}
/**
* Indicates if the Span has unprocessed flows.
*
* @return true if Span can increment to the next flow,
* false otherwise.
*/
public boolean hasMoreFlows() {
return (curFlowIdx < colCount - 1);
}
/**
* Called to notify the span that all its flows have been fully generated so it can update
* its own BPD extent.
*/
public void notifyFlowsFinished() {
int maxFlowBPD = Integer.MIN_VALUE;
for (int i = 0; i < colCount; i++) {
maxFlowBPD = Math.max(maxFlowBPD, getNormalFlow(i).getAllocBPD());
}
bpd = maxFlowBPD;
}
/**
* Indicates whether any child areas have been added to this span area.
*
* This is achieved by looping through each flow.
* @return true if no child areas have been added yet.
*/
public boolean isEmpty() {
int areaCount = 0;
for (int i = 0; i < getColumnCount(); i++) {
NormalFlow flow = getNormalFlow(i);
if (flow != null) {
if (flow.getChildAreas() != null) {
areaCount += flow.getChildAreas().size();
}
}
}
return (areaCount == 0);
}
/** @see java.lang.Object#toString() */
public String toString() {
StringBuffer sb = new StringBuffer(super.toString());
if (colCount > 1) {
sb.append(" {colCount=").append(colCount);
sb.append(", colWidth=").append(colWidth);
sb.append(", curFlowIdx=").append(this.curFlowIdx);
sb.append("}");
}
return sb.toString();
}
}
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