Description Remy Suen 2010-03-16 13:23:34 EDT

That summary was a mouthful so here's the code to reproduce the problem. The idea here is that if you invoke setFocus() on a Control before it's set to a CTabItem, the folder will arbitrarily take that request and select the item at index 0.

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Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
shell.setSize(600, 400);
shell.open();

CTabFolder folder = new CTabFolder(shell, SWT.BORDER);
for (int i = 0; i < 4; i++) {
  CTabItem item = new CTabItem(folder, SWT.CLOSE);
  item.setText("Item " + i);
  Text text = new Text(folder, SWT.MULTI);
  text.setText("Content for Item " + i);
  if (i == 3) {
    text.setFocus();
  }
  item.setControl(text);
}

shell.layout(true, true);

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

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If setControl(Control) is invoked _before_ setFocus() is called on the control, then it will not eagerly select item 0.

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Here's a stack trace of what I hit when debugging through e4 code.

	StackRenderer$5.widgetSelected(SelectionEvent) line: 409	
	TypedListener.handleEvent(Event) line: 228	
	EventTable.sendEvent(Event) line: 84	
	CTabFolder(Widget).sendEvent(Event) line: 1050	
	CTabFolder(Widget).sendEvent(int, Event, boolean) line: 1074	
	CTabFolder(Widget).sendEvent(int, Event) line: 1059	
	CTabFolder(Widget).notifyListeners(int, Event) line: 773	
	CTabFolder.setSelection(int, boolean) line: 2722	
	CTabFolder.onFocus(Event) line: 1306	
	CTabFolder$1.handleEvent(Event) line: 253	
	EventTable.sendEvent(Event) line: 84	
	CTabFolder(Widget).sendEvent(Event) line: 1050	
	CTabFolder(Widget).sendEvent(int, Event, boolean) line: 1074	
	CTabFolder(Widget).sendEvent(int) line: 1055	
	CTabFolder(Control).sendFocusEvent(int) line: 2597	
	CTabFolder(Widget).wmSetFocus(int, int, int) line: 2399	
	CTabFolder(Control).WM_SETFOCUS(int, int) line: 4771	
	CTabFolder(Control).windowProc(int, int, int, int) line: 4208	
	Display.windowProc(int, int, int, int) line: 4843	
	OS.SetFocus(int) line: not available [native method]	
	CTabFolder(Control).forceFocus() line: 978	
	CTabFolder(Control).setFixedFocus() line: 2959	
	CTabFolder(Composite).setFixedFocus() line: 1039	
	Composite(Control).fixFocus(Control) line: 936	
	Composite(Control).setVisible(boolean) line: 3386	
	CTabItem.setControl(Control) line: 301	
	StackRenderer.createTab(MElementContainer<MUIElement>, MUIElement) line: 277