public static IObservable <KeyboardFocusChangedEventArgs> PreviewGotKeyboardFocus(this DependencyObject that)
{
return(Observable.FromEvent <KeyboardFocusChangedEventArgs>(
on => Keyboard.AddPreviewGotKeyboardFocusHandler(that, (o, e) => on(e)),
on => Keyboard.RemovePreviewGotKeyboardFocusHandler(that, (o, e) => on(e))
));
}
} // proc LoadInternAsync
/// <summary>Control is created.</summary>
protected virtual void OnControlCreated()
{
CallMemberDirect(nameof(OnControlCreated), Array.Empty <object>(), rawGet: true, ignoreNilFunction: true);
Mouse.AddPreviewMouseDownHandler(Control, Control_MouseDownHandler);
Mouse.AddPreviewMouseDownOutsideCapturedElementHandler(Control, Control_MouseDownHandler);
Keyboard.AddPreviewGotKeyboardFocusHandler(Control, Control_GotKeyboardFocusHandler);
Keyboard.AddPreviewLostKeyboardFocusHandler(Control, Control_LostKeyboardFocusHandler);
Keyboard.AddPreviewKeyUpHandler(Control, Control_KeyUpHandler);
} // proc OnControlCreated
private void RegisterFocusEvents(bool register)
{
if (register && !eventWired)
{
Keyboard.AddPreviewGotKeyboardFocusHandler(this, new KeyboardFocusChangedEventHandler(TooltipTracker));
eventWired = true;
}
else if (!register && eventWired)
{
Keyboard.RemoveGotKeyboardFocusHandler(this, new KeyboardFocusChangedEventHandler(TooltipTracker));
eventWired = false;
}
}
