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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;
import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.custom.*;
/**
* StyledText snippet: embed images
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.2
*/
public class Snippet212 {
static StyledText styledText;
static String text =
"This snippet shows how to embed images in a StyledText.\n"+
"Here is one: \uFFFC, and here is another: \uFFFC."+
"Use the add button to add an image from your filesystem to the StyledText at the current caret offset.";
static void addImage(Image image, int offset) {
StyleRange style = new StyleRange ();
style.start = offset;
style.length = 1;
style.data = image;
Rectangle rect = image.getBounds();
style.metrics = new GlyphMetrics(rect.height, 0, rect.width);
styledText.setStyleRange(style);
}
public static void main(String [] args) {
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new GridLayout());
styledText = new StyledText(shell, SWT.WRAP | SWT.BORDER);
styledText.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
styledText.setText(text);
int offset = text.indexOf("\uFFFC", 0);
addImage(display.getSystemImage(SWT.ICON_QUESTION), offset);
offset = text.indexOf("\uFFFC", offset + 1);
addImage(display.getSystemImage(SWT.ICON_INFORMATION), offset);
// use a verify listener to dispose the images
styledText.addVerifyListener(new VerifyListener() {
public void verifyText(VerifyEvent event) {
if (event.start == event.end) return;
String text = styledText.getText(event.start, event.end - 1);
int index = text.indexOf('\uFFFC');
while (index != -1) {
StyleRange style = styledText.getStyleRangeAtOffset(event.start + index);
if (style != null) {
Image image = (Image)style.data;
if (image != null) image.dispose();
}
index = text.indexOf('\uFFFC', index + 1);
}
}
});
// draw images on paint event
styledText.addPaintObjectListener(new PaintObjectListener() {
public void paintObject(PaintObjectEvent event) {
StyleRange style = event.style;
Image image = (Image)style.data;
if (!image.isDisposed()) {
int x = event.x;
int y = event.y + event.ascent - style.metrics.ascent;
event.gc.drawImage(image, x, y);
}
}
});
styledText.addListener(SWT.Dispose, new Listener() {
public void handleEvent(Event event) {
StyleRange[] styles = styledText.getStyleRanges();
for (int i = 0; i < styles.length; i++) {
StyleRange style = styles[i];
if (style.data != null) {
Image image = (Image)style.data;
if (image != null) image.dispose();
}
}
}
});
Button button = new Button (shell, SWT.PUSH);
button.setText("Add Image");
button.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, false, false));
button.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
FileDialog dialog = new FileDialog(shell);
String filename = dialog.open();
if (filename != null) {
try {
Image image = new Image(display, filename);
int offset = styledText.getCaretOffset();
styledText.replaceTextRange(offset, 0, "\uFFFC");
addImage(image, offset);
} catch (Exception e) {
e.printStackTrace();
}
}
}
});
shell.setSize(400, 400);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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