private static void TimePropertyChangedCallback(DependencyObject sender, DependencyPropertyChangedEventArgs arg)
{
if (sender != null && sender is ClockUserCtrl)
{
ClockUserCtrl clock = sender as ClockUserCtrl;
clock.OnTimeUpdated((DateTime)arg.OldValue, (DateTime)arg.NewValue);//更新前后的值
}
}
private static void ExecuteSpeak(object sender, ExecutedRoutedEventArgs arg)
{
ClockUserCtrl clock = sender as ClockUserCtrl;
if (clock != null)
{
clock.SpeakTheTime();
}
}
private static void CanExecuteSpeak(object sender, CanExecuteRoutedEventArgs arg)
{
ClockUserCtrl clock = sender as ClockUserCtrl;
arg.CanExecute = (clock != null);
}