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/*******************************************************************************
* Copyright (c) 2018 Red Hat 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:
* Red Hat - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.tests.gtk.snippets;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.FocusAdapter;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
/**
* This Snippet is supposed to demonstrate a probable Bug in SWT for gtk. It causes a general protection fault when you do the following:
* - launch as swt app
* - focus the first textfield
* - click into the second textfield
* - click back into the first one --> should crash with a GPF with: Symbol=IA__gtk_container_set_focus_child . The symbol changes from time to time to g_object_lib but is the focus_child one most of the time
* - it usually happens the first time this is done but you sometimes might have to do it 2-3 times
*
* The Problem seems to arise because the widget that looses focus is disposed during its own focus event processing. Though this works without problems on windows plattforms.
* @author psimon
*
*/
public class Bug245593_DisposeWidgetParent {
Shell shell;
public Bug245593_DisposeWidgetParent() {
final Display display = new Display();
shell = new Shell(display);
shell.setLayout(new FillLayout());
shell.setSize(200,200);
createWidgets();
shell.open ();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
public static void main(String [] args) {
new Bug245593_DisposeWidgetParent();
}
public void disposeWidgets(){
parent.dispose();
}
private Composite parent;
public void createWidgets(){
parent = new Composite(shell,SWT.NONE);
parent.setLayout(new GridLayout(2,true));
Text triggerText = new Text(parent,SWT.BORDER);
triggerText.setText("widget.text 1");
Text looseFocus = new Text(parent,SWT.BORDER);
looseFocus.setText("widget.text 2");
triggerText.addFocusListener(new FocusAdapter(){
@Override
public void focusLost(FocusEvent e) {
triggerRefresh();
}
});
shell.layout();
}
public void triggerRefresh(){
disposeWidgets();
createWidgets();
shell.layout();
}
}
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