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Home » Eclipse Projects » Standard Widget Toolkit (SWT) » ExpandItem(ExpandItem: parent layout appears incorrect on Expand/Collaps events)
ExpandItem [message #1782191] Tue, 20 February 2018 10:48
Julia Kurde is currently offline Julia KurdeFriend
Messages: 88
Registered: November 2011
Location: Berlin, Germany

I have the following snipped with a GridLayout and two Composites, an upper one and a lower one. The lower one is an ExpandBar with one Item. When the Item is collapsed, the parent should layout so that the available vertical space is grabbed by the upper composite. Correspondingly, when the the Item is expanded, it should get the space it needs.
package probieren.julia.layout;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.ExpandBar;
import org.eclipse.swt.widgets.ExpandItem;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

public class MyLayoutExpandBar {
	public static void main (String [] args) {
		final Display display = new Display ();
		Shell shell = new Shell (display);
		shell.setLayout (new FillLayout());

		final Composite parent = new Composite (shell, SWT.BORDER);
		parent.setLayout(new GridLayout());
		Composite comp = new Composite(parent, SWT.BORDER);
		comp.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
		ExpandBar expandBar = new ExpandBar (parent, SWT.V_SCROLL);
		expandBar.setLayoutData(new GridData(SWT.FILL, SWT.END, true, false));

		ExpandItem item = new ExpandItem (expandBar, SWT.NONE);
		item.setText("Expand Item");

		/* Listener */
		expandBar.addListener(SWT.Expand, new Listener() {
			public void handleEvent(Event event) {
				display.asyncExec(new Runnable() {
					public void run() {
		expandBar.addListener(SWT.Collapse, new Listener() {
			public void handleEvent(Event event) {
				display.asyncExec(new Runnable() {
					public void run() {
		shell.setSize(300, 300); ();

		while (!shell.isDisposed ()) {
			if (!display.readAndDispatch ())
				display.sleep ();
		display.dispose ();

On Windows the snipped works, but on Linux (in my case Ubuntu 16.04 LTS) the size of the ExpandBar after a Collaps/Expand event is not yet updated when parent.layout() is called. So the hight of the ExpandBar is small when it is expanded and large when it is collapsed (just opposite as it should!).
After the parent is resized, e.g. by resizing the shell, the layout appears correctly.

Does anyone know, how to make this work correctly?
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