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POSWT ExpandListener executes before collapse occurs on Linux
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copied!<p>This is a simple executable snippet that shows the issue. </p> <p>When using the ExpandBar the desired outcome is to resize the window when there is a collapse or expand. It works properly on Mac but does not on Linux.</p> <p>It looks like the <strong>ExpandListener</strong> is called before the collapse/expand actually occurs and therefore the <strong>pack()</strong> resizes incorrectly.</p> <p>The async execution is merely a bandage to have it work on Mac but this does not work on Linux.</p> <pre><code>import org.eclipse.swt.*; import org.eclipse.swt.layout.*; import org.eclipse.swt.widgets.*; import org.eclipse.swt.events.ExpandEvent; import org.eclipse.swt.events.ExpandListener; public class ExpandBarExample { public static void main(String[] args) { Shell shell = new Shell(SWT.DIALOG_TRIM | SWT.MIN | SWT.APPLICATION_MODAL); shell.setLayout(new FormLayout()); shell.setText("Expand Bar"); final ExpandBar bar = new ExpandBar(shell, SWT.NONE); FormData fd = new FormData(); fd.top = new FormAttachment(0); fd.left = new FormAttachment(0); fd.right = new FormAttachment(100); fd.bottom = new FormAttachment(100); bar.setLayoutData(fd); bar.addExpandListener(new ExpandListener() { public void itemCollapsed(ExpandEvent arg0) { Display.getCurrent().asyncExec(new Runnable() { public void run() { bar.getShell().pack(); } }); } public void itemExpanded(ExpandEvent arg0) { bar.getShell().pack(); Display.getCurrent().asyncExec(new Runnable() { public void run() { bar.getShell().pack(); } }); } }); Composite composite = new Composite(bar, SWT.NONE); fd = new FormData(); fd.left = new FormAttachment(0); fd.right = new FormAttachment(100); composite.setLayoutData(fd); FormLayout layout = new FormLayout(); layout.marginLeft = layout.marginTop = layout.marginRight = layout.marginBottom = 8; composite.setLayout(layout); Label label = new Label(composite, SWT.NONE); label.setText("This is Bar 1"); ExpandItem item1 = new ExpandItem(bar, SWT.NONE, 0); item1.setText("Bar 1"); item1.setHeight(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT).y); item1.setControl(composite); item1.setExpanded(true); composite = new Composite(bar, SWT.NONE); fd = new FormData(); fd.left = new FormAttachment(0); fd.right = new FormAttachment(100); composite.setLayoutData(fd); layout = new FormLayout(); layout.marginLeft = layout.marginTop = layout.marginRight = layout.marginBottom = 8; composite.setLayout(layout); label = new Label(composite, SWT.NONE); label.setText("This is Bar2"); ExpandItem item2 = new ExpandItem(bar, SWT.NONE, 1); item2.setText("Bar 2"); item2.setHeight(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT).y); item2.setControl(composite); item2.setExpanded(true); composite = new Composite(bar, SWT.NONE); fd = new FormData(); fd.left = new FormAttachment(0); fd.right = new FormAttachment(100); composite.setLayoutData(fd); layout = new FormLayout(); layout.marginLeft = layout.marginTop = layout.marginRight = layout.marginBottom = 8; composite.setLayout(layout); label = new Label(composite, SWT.NONE); label.setText("This is Bar3"); ExpandItem item3 = new ExpandItem(bar, SWT.NONE, 2); item3.setText("Bar 3"); item3.setHeight(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT).y); item3.setControl(composite); item3.setExpanded(true); bar.setSpacing(6); shell.pack(); shell.open(); Display display = shell.getDisplay(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } } </code></pre>

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