Mega Code Archive
Embed image and controls in TextLayout
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/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
//package org.eclipse.swt.snippets;
/*
* TextLayout example snippet: using the GlyphMetrics to embedded images in
* a TextLayout.
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.2
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.GlyphMetrics;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.graphics.TextLayout;
import org.eclipse.swt.graphics.TextStyle;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
public class TextLayoutImageControl {
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display, SWT.SHELL_TRIM | SWT.DOUBLE_BUFFERED);
shell.setText("Embedding objects in text");
final Image[] images = { new Image(display, 32, 32), new Image(display, 20, 40),
new Image(display, 40, 20) };
int[] colors = { SWT.COLOR_BLUE, SWT.COLOR_MAGENTA, SWT.COLOR_GREEN };
for (int i = 0; i < images.length; i++) {
GC gc = new GC(images[i]);
gc.setBackground(display.getSystemColor(colors[i]));
gc.fillRectangle(images[i].getBounds());
gc.dispose();
}
final Button button = new Button(shell, SWT.PUSH);
button.setText("Button");
button.pack();
String text = "Here is some text with a blue image \uFFFC, a magenta image \uFFFC, a green image \uFFFC, and a button: \uFFFC.";
final int[] imageOffsets = { 36, 55, 72 };
final TextLayout layout = new TextLayout(display);
layout.setText(text);
for (int i = 0; i < images.length; i++) {
Rectangle bounds = images[i].getBounds();
TextStyle imageStyle = new TextStyle(null, null, null);
imageStyle.metrics = new GlyphMetrics(bounds.height, 0, bounds.width);
layout.setStyle(imageStyle, imageOffsets[i], imageOffsets[i]);
}
Rectangle bounds = button.getBounds();
TextStyle buttonStyle = new TextStyle(null, null, null);
buttonStyle.metrics = new GlyphMetrics(bounds.height, 0, bounds.width);
final int buttonOffset = text.length() - 2;
layout.setStyle(buttonStyle, buttonOffset, buttonOffset);
shell.addListener(SWT.Paint, new Listener() {
public void handleEvent(Event event) {
GC gc = event.gc;
Point margin = new Point(10, 10);
layout.setWidth(shell.getClientArea().width - 2 * margin.x);
layout.draw(event.gc, margin.x, margin.y);
for (int i = 0; i < images.length; i++) {
int offset = imageOffsets[i];
int lineIndex = layout.getLineIndex(offset);
FontMetrics lineMetrics = layout.getLineMetrics(lineIndex);
Point point = layout.getLocation(offset, false);
GlyphMetrics glyphMetrics = layout.getStyle(offset).metrics;
gc.drawImage(images[i], point.x + margin.x, point.y + margin.y + lineMetrics.getAscent()
- glyphMetrics.ascent);
}
int lineIndex = layout.getLineIndex(buttonOffset);
FontMetrics lineMetrics = layout.getLineMetrics(lineIndex);
Point point = layout.getLocation(buttonOffset, false);
GlyphMetrics glyphMetrics = layout.getStyle(buttonOffset).metrics;
button.setLocation(point.x + margin.x, point.y + margin.y + lineMetrics.getAscent()
- glyphMetrics.ascent);
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
layout.dispose();
for (int i = 0; i < images.length; i++) {
images[i].dispose();
}
display.dispose();
}
}
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