Attachment 264574 Details for Bug 245593 – Snippet reproducing the focus issue

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Snippet reproducing the focus issue

Bug245593_DisposeWidgetParent.java (text/x-java), 2.16 KB, created by Eric Williams

on 2016-10-04 11:01:31 EDT

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Filename:

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Creator: Eric Williams

Created: 2016-10-04 11:01:31 EDT

Size: 2.16 KB

patch

obsolete

>package z_unsorted;
>
>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("text 1");
>		Text looseFocus = new Text(parent,SWT.BORDER);
>		looseFocus.setText("text 2");
>		triggerText.addFocusListener(new FocusAdapter(){
>
>			public void focusLost(FocusEvent e) {
>				triggerRefresh();
>			}
>			
>		});
>
>		shell.layout();
>	}
>	
>	public void triggerRefresh(){
>		disposeWidgets();
>		createWidgets();
>		shell.layout();
>	}
>	
>	}

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Attachments on bug 245593: 111253 | 264574