/*******************************************************************************
* 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.SWT;
import org.eclipse.swt.custom.PaintObjectEvent;
import org.eclipse.swt.custom.PaintObjectListener;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.events.VerifyEvent;
import org.eclipse.swt.events.VerifyListener;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.GlyphMetrics;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
/**
* StyledText snippet: embed images
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.2
*/
public class StyledTextEmbedImages {
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 Image[] images;
static int[] offsets;
static void addImage(Image image, int offset) {
StyleRange style = new StyleRange();
style.start = offset;
style.length = 1;
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);
images = new Image[] { display.getSystemImage(SWT.ICON_QUESTION),
display.getSystemImage(SWT.ICON_INFORMATION), };
offsets = new int[images.length];
int lastOffset = 0;
for (int i = 0; i < images.length; i++) {
int offset = text.indexOf("\uFFFC", lastOffset);
offsets[i] = offset;
addImage(images[i], offset);
lastOffset = offset + 1;
}
// use a verify listener to keep the offsets up to date
styledText.addVerifyListener(new VerifyListener() {
public void verifyText(VerifyEvent e) {
int start = e.start;
int replaceCharCount = e.end - e.start;
int newCharCount = e.text.length();
for (int i = 0; i < offsets.length; i++) {
int offset = offsets[i];
if (start <= offset && offset < start + replaceCharCount) {
// this image is being deleted from the text
if (images[i] != null && !images[i].isDisposed()) {
images[i].dispose();
images[i] = null;
}
offset = -1;
}
if (offset != -1 && offset >= start)
offset += newCharCount - replaceCharCount;
offsets[i] = offset;
}
}
});
styledText.addPaintObjectListener(new PaintObjectListener() {
public void paintObject(PaintObjectEvent event) {
GC gc = event.gc;
StyleRange style = event.style;
int start = style.start;
for (int i = 0; i < offsets.length; i++) {
int offset = offsets[i];
if (start == offset) {
Image image = images[i];
int x = event.x;
int y = event.y + event.ascent - style.metrics.ascent;
gc.drawImage(image, x, y);
}
}
}
});
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");
int index = 0;
while (index < offsets.length) {
if (offsets[index] == -1 && images[index] == null)
break;
index++;
}
if (index == offsets.length) {
int[] tmpOffsets = new int[index + 1];
System.arraycopy(offsets, 0, tmpOffsets, 0, offsets.length);
offsets = tmpOffsets;
Image[] tmpImages = new Image[index + 1];
System.arraycopy(images, 0, tmpImages, 0, images.length);
images = tmpImages;
}
offsets[index] = offset;
images[index] = image;
addImage(image, offset);
} catch (Exception e) {
e.printStackTrace();
}
}
}
});
shell.setSize(400, 400);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
for (int i = 0; i < images.length; i++) {
Image image = images[i];
if (image != null && !image.isDisposed()) {
image.dispose();
}
}
display.dispose();
}
}
