183 lines
5.9 KiB
Java
183 lines
5.9 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* @author Oleg V. Khaschansky
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* @version $Revision$
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*/
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package java.awt.font;
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import java.text.AttributedCharacterIterator;
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import org.apache.harmony.awt.gl.font.TextMetricsCalculator;
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import org.apache.harmony.awt.gl.font.TextRunBreaker;
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/**
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* The TextMeasurer class provides utilities for line break operations.
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*
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* @since Android 1.0
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*/
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public final class TextMeasurer implements Cloneable {
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/**
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* The aci.
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*/
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AttributedCharacterIterator aci;
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/**
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* The frc.
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*/
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FontRenderContext frc;
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/**
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* The breaker.
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*/
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TextRunBreaker breaker = null;
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/**
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* The tmc.
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*/
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TextMetricsCalculator tmc = null;
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/**
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* Instantiates a new text measurer from the specified text.
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*
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* @param text
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* the source text.
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* @param frc
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* the FontRenderContext.
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*/
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public TextMeasurer(AttributedCharacterIterator text, FontRenderContext frc) {
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this.aci = text;
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this.frc = frc;
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breaker = new TextRunBreaker(aci, this.frc);
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tmc = new TextMetricsCalculator(breaker);
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}
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/**
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* Replaces the current text with the new text, inserting a break character
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* at the specified insert position.
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*
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* @param newParagraph
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* the new paragraph text.
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* @param insertPos
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* the position in the text where the character is inserted.
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*/
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public void insertChar(AttributedCharacterIterator newParagraph, int insertPos) {
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AttributedCharacterIterator oldAci = aci;
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aci = newParagraph;
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if ((oldAci.getEndIndex() - oldAci.getBeginIndex())
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- (aci.getEndIndex() - aci.getBeginIndex()) != -1) {
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breaker = new TextRunBreaker(aci, this.frc);
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tmc = new TextMetricsCalculator(breaker);
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} else {
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breaker.insertChar(newParagraph, insertPos);
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}
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}
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/**
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* Replaces the current text with the new text and deletes a character at
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* the specified position.
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*
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* @param newParagraph
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* the paragraph text after deletion.
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* @param deletePos
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* the position in the text where the character is removed.
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*/
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public void deleteChar(AttributedCharacterIterator newParagraph, int deletePos) {
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AttributedCharacterIterator oldAci = aci;
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aci = newParagraph;
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if ((oldAci.getEndIndex() - oldAci.getBeginIndex())
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- (aci.getEndIndex() - aci.getBeginIndex()) != 1) {
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breaker = new TextRunBreaker(aci, this.frc);
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tmc = new TextMetricsCalculator(breaker);
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} else {
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breaker.deleteChar(newParagraph, deletePos);
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}
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}
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/**
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* Returns a copy of this object.
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*
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* @return a copy of this object.
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*/
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@Override
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protected Object clone() {
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return new TextMeasurer((AttributedCharacterIterator)aci.clone(), frc);
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}
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/**
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* Returns a TextLayout of the specified character range.
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*
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* @param start
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* the index of the first character.
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* @param limit
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* the index after the last character.
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* @return a TextLayout for the characters beginning at "start" up to "end".
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*/
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public TextLayout getLayout(int start, int limit) {
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breaker.pushSegments(start - aci.getBeginIndex(), limit - aci.getBeginIndex());
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breaker.createAllSegments();
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TextLayout layout = new TextLayout((TextRunBreaker)breaker.clone());
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breaker.popSegments();
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return layout;
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}
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/**
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* Returns the graphical width of a line beginning at "start" parameter and
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* including characters up to "end" parameter. "start" and "end" are
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* absolute indices, not relative to the "start" of the paragraph.
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*
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* @param start
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* the character index at which to start measuring.
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* @param end
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* the character index at which to stop measuring.
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* @return the graphical width of a line beginning at "start" and including
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* characters up to "end".
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*/
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public float getAdvanceBetween(int start, int end) {
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breaker.pushSegments(start - aci.getBeginIndex(), end - aci.getBeginIndex());
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breaker.createAllSegments();
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float retval = tmc.createMetrics().getAdvance();
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breaker.popSegments();
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return retval;
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}
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/**
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* Returns the index of the first character which is not fit on a line
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* beginning at start and possible measuring up to maxAdvance in graphical
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* width.
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*
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* @param start
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* he character index at which to start measuring.
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* @param maxAdvance
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* the graphical width in which the line must fit.
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* @return the index after the last character that is fit on a line
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* beginning at start, which is not longer than maxAdvance in
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* graphical width.
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*/
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public int getLineBreakIndex(int start, float maxAdvance) {
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breaker.createAllSegments();
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return breaker.getLineBreakIndex(start - aci.getBeginIndex(), maxAdvance)
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+ aci.getBeginIndex();
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}
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}
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