// OnWindowHideOrClose - Called by the WindowHideOrCloseTracker class when UI is hidden or destroyed
private static void OnWindowHideOrClose(IntPtr hwnd, AutomationElement rawEl, int [] runtimeId)
{
bool doWindowClosedEvent = false;
bool doStructureChangedEvent = false;
lock ( _classLock )
{
if (_listeners != null)
{
// if an hwnd is hidden or closed remove event listeners for the window's provider
for (int i = 0; i < _listeners.Count; i++)
{
EventListenerClientSide ec = (EventListenerClientSide)_listeners[i];
EventListener l = ec.EventListener;
if (l.EventId == WindowPattern.WindowClosedEvent)
{
doWindowClosedEvent = true;
}
if (l.EventId == AutomationElement.StructureChangedEvent)
{
doStructureChangedEvent = true;
}
// Only advise UI contexts if the provider still exists
// (but keep looking to see if need to do a WindowClosedEvent)
if (rawEl == null)
{
continue;
}
// Only advise UI contexts if the provider might raise that event.
if (!ShouldAdviseProviders(l.EventId))
{
continue;
}
// Only advise UI contexts if the element is w/in scope of the reference element
if (!ec.WithinScope(rawEl))
{
continue;
}
// Notify the server-side that this event is no longer interesting
UiaCoreApi.UiaEventRemoveWindow(ec.EventHandle, hwnd);
}
}
}
// Piggy-back on the listener for Windows hiding or closing to raise WindowClosed and StructureChanged events.
// When the hwnd behind rawEl is being destroyed, it can't be determined that rawEl once had the
// WindowPattern interface. Therefore raise an event for any window close.
if (doWindowClosedEvent)
{
// When the hwnd is just hidden, rawEl will not be null, so can test if this would support WindowPattern
// and throw this event away if the window doesn't support that CP
if (rawEl != null && !HwndProxyElementProvider.IsWindowPatternWindow(NativeMethods.HWND.Cast(hwnd)))
{
return;
}
// Go ahead and raise a client-side only WindowClosedEvent (if anyone is listening)
WindowClosedEventArgs e = new WindowClosedEventArgs(runtimeId);
RaiseEventInThisClientOnly(WindowPattern.WindowClosedEvent, runtimeId, e);
}
if (doStructureChangedEvent)
{
// Raise an event for structure changed. This element has essentially gone away so there isn't an
// opportunity to do filtering here. So, just like WindowClosed, this event will be very noisy.
StructureChangedEventArgs e = new StructureChangedEventArgs(StructureChangeType.ChildRemoved, runtimeId);
RaiseEventInThisClientOnly(AutomationElement.StructureChangedEvent, runtimeId, e);
}
}
