AcManager.Controls.Services.ImageViewerService.OnImageChanged C# (CSharp) 메소드

        private static void OnImageChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) {
            var control = d as UIElement;
            if (control == null) return;
            if (e.OldValue == null) {
                control.MouseLeftButtonDown += Control_MouseDown;
            } else if (e.NewValue == null) {
                control.MouseLeftButtonDown -= Control_MouseDown;
            }
        }