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/*******************************************************************************
* Copyright (c) 2000, 2010 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;
/*
* ExpandBar snippet: change an ExpandItem's height in response to a change in a
* contained Control
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.*;
public class Snippet343 {
public static void main(String[] args) {
final Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
shell.setSize(400, 400);
SashForm sashForm = new SashForm(shell, SWT.HORIZONTAL);
Composite leftComposite = new Composite(sashForm, SWT.NONE);
leftComposite.setLayout(new FillLayout());
Composite rightComposite = new Composite(sashForm, SWT.NONE);
rightComposite.setLayout(new FillLayout());
ExpandBar expandBar = new ExpandBar(leftComposite, SWT.NONE);
final ExpandItem expandItem1 = new ExpandItem(expandBar, SWT.NONE);
expandItem1.setText("item 1");
new ExpandItem(expandBar, SWT.NONE).setText("item 2"); /* expandItem2 */
final StyledText text = new StyledText(expandBar, SWT.MULTI | SWT.WRAP);
expandItem1.setControl(text);
text.setText("initial text that will wrap if it's long enough");
/* update the item's height if needed in response to changes in the text's size */
final int TRIAL_WIDTH = 100;
final int trimWidth = text.computeTrim(0, 0, TRIAL_WIDTH, 100).width - TRIAL_WIDTH;
text.addListener(SWT.Modify, new Listener() {
public void handleEvent(Event event) {
Point size = text.computeSize(text.getSize().x - trimWidth, SWT.DEFAULT);
if (expandItem1.getHeight() != size.y) {
expandItem1.setHeight(size.y);
}
}
});
expandBar.addListener(SWT.Resize, new Listener() {
public void handleEvent(Event event) {
/*
* The following is done asynchronously to allow the Text's width
* to be changed before re-calculating its preferred height.
*/
display.asyncExec(new Runnable() {
public void run() {
if (text.isDisposed()) return;
Point size = text.computeSize(text.getSize().x - trimWidth, SWT.DEFAULT);
if (expandItem1.getHeight() != size.y) {
expandItem1.setHeight(size.y);
}
}
});
}
});
shell.open();
/* set the item's initial height */
Point size = text.computeSize(expandBar.getClientArea().width, SWT.DEFAULT);
expandItem1.setHeight(size.y);
expandItem1.setExpanded(true);
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
}
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