org.eclipse.swt.snippets.Snippet205.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet205.java

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/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * 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.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

public class Snippet205 {

    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, 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 lineIndex1 = layout.getLineIndex(offset);
                FontMetrics lineMetrics1 = layout.getLineMetrics(lineIndex1);
                Point point1 = layout.getLocation(offset, false);
                GlyphMetrics glyphMetrics1 = layout.getStyle(offset).metrics;
                gc.drawImage(images[i], point1.x + margin.x,
                        point1.y + margin.y + lineMetrics1.getAscent() - glyphMetrics1.ascent);
            }
            int lineIndex2 = layout.getLineIndex(buttonOffset);
            FontMetrics lineMetrics2 = layout.getLineMetrics(lineIndex2);
            Point point2 = layout.getLocation(buttonOffset, false);
            GlyphMetrics glyphMetrics2 = layout.getStyle(buttonOffset).metrics;
            button.setLocation(point2.x + margin.x,
                    point2.y + margin.y + lineMetrics2.getAscent() - glyphMetrics2.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();
    }
}