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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.custom.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
/**
* StyledText snippet: embed controls
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.2
*/
public class Snippet217 {
static StyledText styledText;
static String text =
"This snippet shows how to embed widgets in a StyledText.\n"+
"Here is one: \uFFFC, and here is another: \uFFFC.";
static int[] offsets;
static Control[] controls;
static int MARGIN = 5;
static void addControl(Control control, int offset) {
StyleRange style = new StyleRange ();
style.start = offset;
style.length = 1;
control.pack();
Rectangle rect = control.getBounds();
int ascent = 2*rect.height/3;
int descent = rect.height - ascent;
style.metrics = new GlyphMetrics(ascent + MARGIN, descent + MARGIN, rect.width + 2*MARGIN);
styledText.setStyleRange(style);
}
public static void main(String [] args) {
final Display display = new Display();
Font font = new Font(display, "Tahoma", 32, SWT.NORMAL);
final Shell shell = new Shell(display);
shell.setLayout(new GridLayout());
styledText = new StyledText(shell, SWT.WRAP | SWT.BORDER);
styledText.setFont(font);
styledText.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
styledText.setText(text);
controls = new Control[2];
Button button = new Button(styledText, SWT.PUSH);
button.setText("Button 1");
controls[0] = button;
Combo combo = new Combo(styledText, SWT.NONE);
combo.add("item 1");
combo.add("another item");
controls[1] = combo;
offsets = new int[controls.length];
int lastOffset = 0;
for (int i = 0; i < controls.length; i++) {
int offset = text.indexOf("\uFFFC", lastOffset);
offsets[i] = offset;
addControl(controls[i], offsets[i]);
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 widget is being deleted from the text
if (controls[i] != null && !controls[i].isDisposed()) {
controls[i].dispose();
controls[i] = null;
}
offset = -1;
}
if (offset != -1 && offset >= start) offset += newCharCount - replaceCharCount;
offsets[i] = offset;
}
}
});
// reposition widgets on paint event
styledText.addPaintObjectListener(new PaintObjectListener() {
public void paintObject(PaintObjectEvent event) {
StyleRange style = event.style;
int start = style.start;
for (int i = 0; i < offsets.length; i++) {
int offset = offsets[i];
if (start == offset) {
Point pt = controls[i].getSize();
int x = event.x + MARGIN;
int y = event.y + event.ascent - 2*pt.y/3;
controls[i].setLocation(x, y);
break;
}
}
}
});
shell.setSize(400, 400);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
font.dispose();
display.dispose();
}
}
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