/*
* 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.
*/
/*
* @author Oleg V. Khaschansky
*/
package com.jgraph.gaeawt.java.awt.font;
import java.text.AttributedCharacterIterator;
import org.apache.harmony.awt.gl.font.TextMetricsCalculator;
import org.apache.harmony.awt.gl.font.TextRunBreaker;
public final class TextMeasurer implements Cloneable {
AttributedCharacterIterator aci;
FontRenderContext frc;
TextRunBreaker breaker = null;
TextMetricsCalculator tmc = null;
public TextMeasurer(AttributedCharacterIterator text, FontRenderContext frc) {
this.aci = text;
this.frc = frc;
breaker = new TextRunBreaker(aci, this.frc);
tmc = new TextMetricsCalculator(breaker);
}
public void insertChar(AttributedCharacterIterator newParagraph, int insertPos) {
AttributedCharacterIterator oldAci = aci;
aci = newParagraph;
if ((oldAci.getEndIndex() - oldAci.getBeginIndex()) -
(aci.getEndIndex() - aci.getBeginIndex()) != -1) {
breaker = new TextRunBreaker(aci, this.frc);
tmc = new TextMetricsCalculator(breaker);
} else {
breaker.insertChar(newParagraph, insertPos);
}
}
public void deleteChar(AttributedCharacterIterator newParagraph, int deletePos) {
AttributedCharacterIterator oldAci = aci;
aci = newParagraph;
if ((oldAci.getEndIndex() - oldAci.getBeginIndex()) -
(aci.getEndIndex() - aci.getBeginIndex()) != 1) {
breaker = new TextRunBreaker(aci, this.frc);
tmc = new TextMetricsCalculator(breaker);
} else {
breaker.deleteChar(newParagraph, deletePos);
}
}
@Override
protected Object clone() {
return new TextMeasurer((AttributedCharacterIterator) aci.clone(), frc);
}
public TextLayout getLayout(int start, int limit) {
breaker.pushSegments(start - aci.getBeginIndex(), limit - aci.getBeginIndex());
breaker.createAllSegments();
TextLayout layout = new TextLayout((TextRunBreaker) breaker.clone());
breaker.popSegments();
return layout;
}
public float getAdvanceBetween(int start, int end) {
breaker.pushSegments(start - aci.getBeginIndex(), end - aci.getBeginIndex());
breaker.createAllSegments();
float retval = tmc.createMetrics().getAdvance();
breaker.popSegments();
return retval;
}
public int getLineBreakIndex(int start, float maxAdvance) {
breaker.createAllSegments();
return breaker.getLineBreakIndex(
start - aci.getBeginIndex(), maxAdvance) + aci.getBeginIndex();
}
}