Bug 357026

Description Mark McLaren 2011-09-07 20:40:27 EDT

Build Identifier: 3.7.0 (I20110613-1736)

AVG is a popular free anti-virus program, but their latest version seems to cause SWT virtual tables to crash.

Reproducible: Always

Steps to Reproduce:
1. Download and install the free version of AVG here:
http://free.avg.com/au-en/free-antivirus-download

2. Run the snippet shown below.

3. When the table appears, scroll up and down for about 15 seconds.  Eventually the following exception is thrown:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3
	at org.eclipse.swt.widgets.Table.wmNotifyChild(Table.java:6743)
	at org.eclipse.swt.widgets.Control.wmNotify(Control.java:5534)
	at org.eclipse.swt.widgets.Composite.wmNotify(Composite.java:1896)
	at org.eclipse.swt.widgets.Control.WM_NOTIFY(Control.java:5086)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:4584)
	at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:341)
	at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1610)
	at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:2061)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4985)
	at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
	at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:2424)
	at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:564)
	at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:430)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:4623)
	at org.eclipse.swt.widgets.Table.windowProc(Table.java:5893)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4985)
	at org.eclipse.swt.internal.win32.OS.PeekMessageW(Native Method)
	at org.eclipse.swt.internal.win32.OS.PeekMessage(OS.java:3095)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3749)
	at TestVirtualTable.main(TestVirtualTable.java:64)



------------------- code snippet -------------------------

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.RowData;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;


/**
 * A version of Snippet 144 with columns added. 
 */
public class TestVirtualTable {
	
	static final int COUNT = 200;
	
	public static void main(String[] args) {
		
		Display display = new Display ();
		final Shell shell = new Shell (display);
		shell.setLayout (new RowLayout (SWT.VERTICAL));
		final Table table = new Table (shell, SWT.VIRTUAL | SWT.BORDER);
		table.addListener (SWT.SetData, new Listener () {
			public void handleEvent (Event event) {
				if(event.index < 0) {
					throw new RuntimeException("Index < 0");
				}
				
				TableItem item = (TableItem) event.item;
				int index = table.indexOf (item);

				String randomString = ("" + Math.random()).substring(2, 4);
				item.setText(0, randomString);
				item.setText (1, "Foo bah do");
				item.setText(2, "Item " + index);
			}
		});
		table.setLayoutData (new RowData (200, 200));
		createColumns(table);
		
		Button button = new Button (shell, SWT.PUSH);
		button.setText ("Add Items");
		button.addListener (SWT.Selection, new Listener () {
			public void handleEvent (Event event) {

				table.clearAll();
				table.setItemCount (COUNT + 2);				
				shell.layout ();
			}
		});

		table.setItemCount (COUNT);		
		
		shell.pack ();
		shell.open ();
		while (!shell.isDisposed ()) {
			if (!display.readAndDispatch ()) display.sleep ();
		}
		display.dispose ();
	}
	
	private static void createColumns(Table tbl) {
		String[] titles = {" ", "Name", "Size"};
		for (int i = 0; i < titles.length; i++) {
			TableColumn column = new TableColumn (tbl, SWT.VIRTUAL);
			column.setText(titles [i]);
			column.setWidth(50);
		}
	}
}