TextLayoutImageControl.java Source code

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Here is the source code for TextLayoutImageControl.java

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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();
    }
}