Beispiel #1
0
        private static void OnTransitionPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var source        = (TransitioningContentControl)d;
            var oldTransition = (TransitionType)e.OldValue;
            var newTransition = (TransitionType)e.NewValue;

            if (source.IsTransitioning)
            {
                source.AbortTransition();
            }

            // find new transition
            Storyboard newStoryboard = source.GetStoryboard(newTransition);

            // unable to find the transition.
            if (newStoryboard == null)
            {
                // could be during initialization of xaml that presentationgroups was not yet defined
                if (VisualStates.TryGetVisualStateGroup(source, PresentationGroup) == null)
                {
                    // will delay check
                    source.CurrentTransition = null;
                }
                else
                {
                    // revert to old value
                    source.SetValue(TransitionProperty, oldTransition);

                    throw new ArgumentException(string.Format(CultureInfo.CurrentCulture, "Temporary removed exception message", newTransition));
                }
            }
            else
            {
                source.CurrentTransition = newStoryboard;
            }
        }