/*
* 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.
*/
package org.apache.uima.caseditor.editor.annotation;
import org.apache.uima.cas.text.AnnotationFS;
import org.eclipse.jface.text.source.Annotation;
import org.eclipse.jface.text.source.AnnotationPainter.IDrawingStrategy;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
public class TokenDrawingStrategy implements IDrawingStrategy {
private static final int BRACKET_WIDTH = 5;
private static boolean isWhitespace(String text, int offset) {
char character = text.charAt(offset);
return Character.isWhitespace(character);
}
public void draw(Annotation annotation, GC gc, StyledText textWidget, int offset, int length,
Color color) {
if (length > 0) {
if (annotation instanceof EclipseAnnotationPeer) {
AnnotationFS annotationFS = ((EclipseAnnotationPeer) annotation).getAnnotationFS();
if (gc != null) {
Rectangle bounds = textWidget.getTextBounds(offset, offset + length - 1);
gc.setForeground(color);
boolean isDrawOpenBracket = annotationFS.getBegin() == offset;
// and no space before offset
if (isDrawOpenBracket && offset > 1 && !isWhitespace(annotationFS.getCAS().getDocumentText(), offset - 1)) {
gc.drawLine(bounds.x, bounds.y + bounds.height - 1, bounds.x + BRACKET_WIDTH, bounds.y
+ bounds.height - 1);
gc.drawLine(bounds.x, bounds.y, bounds.x, bounds.y + bounds.height - 1);
gc.drawLine(bounds.x, bounds.y, bounds.x + BRACKET_WIDTH, bounds.y);
}
boolean isDrawCloseBracket = annotationFS.getEnd() == offset + length;
// and no space after offset
if (isDrawCloseBracket && offset + length < textWidget.getText().length()
&& !isWhitespace(annotationFS.getCAS().getDocumentText(), offset + length)) {
gc.drawLine(bounds.x + bounds.width, bounds.y + bounds.height - 1, bounds.x
+ bounds.width - BRACKET_WIDTH, bounds.y + bounds.height - 1);
gc.drawLine(bounds.x + bounds.width - 1, bounds.y, bounds.x + bounds.width - 1,
bounds.y + bounds.height - 1);
gc.drawLine(bounds.x + bounds.width, bounds.y, bounds.x + bounds.width - BRACKET_WIDTH,
bounds.y);
}
} else {
textWidget.redrawRange(offset, length, true);
}
}
}
}
}