/// <summary>
///
/// </summary>
public override void OnApplyTemplate()
{
if (IsTransitioning)
{
AbortTransition();
}
if (CustomVisualStates != null && CustomVisualStates.Any())
{
var presentationGroup = VisualStates.TryGetVisualStateGroup(this, PresentationGroup);
if (presentationGroup != null)
{
foreach (var state in CustomVisualStates)
{
presentationGroup.States.Add(state);
}
}
}
base.OnApplyTemplate();
previousContentPresentationSite = GetTemplateChild(PreviousContentPresentationSitePartName) as ContentPresenter;
currentContentPresentationSite = GetTemplateChild(CurrentContentPresentationSitePartName) as ContentPresenter;
if (currentContentPresentationSite != null)
{
if (ContentTemplateSelector != null)
{
currentContentPresentationSite.ContentTemplate = ContentTemplateSelector.SelectTemplate(Content, this);
}
else
{
currentContentPresentationSite.ContentTemplate = ContentTemplate;
}
currentContentPresentationSite.Content = Content;
}
// hookup currenttransition
Storyboard transition = GetStoryboard(Transition);
CurrentTransition = transition;
if (transition == null)
{
var invalidTransition = Transition;
// revert to default
Transition = DefaultTransitionState;
throw new ArgumentException(string.Format("'{0}' Transition could not be found!", invalidTransition), "Transition");
}
VisualStateManager.GoToState(this, NormalState, false);
}
void StartTransition(object oldContent, object newContent)
{
// both presenters must be available, otherwise a transition is useless.
if (currentContentPresentationSite != null && previousContentPresentationSite != null)
{
if (RestartTransitionOnContentChange)
{
CurrentTransition.Completed -= OnTransitionCompleted;
}
if (ContentTemplateSelector != null)
{
previousContentPresentationSite.ContentTemplate = ContentTemplateSelector.SelectTemplate(oldContent, this);
currentContentPresentationSite.ContentTemplate = ContentTemplateSelector.SelectTemplate(newContent, this);
}
else
{
previousContentPresentationSite.ContentTemplate = ContentTemplate;
currentContentPresentationSite.ContentTemplate = ContentTemplate;
}
currentContentPresentationSite.Content = newContent;
previousContentPresentationSite.Content = oldContent;
// and start a new transition
if (!IsTransitioning || RestartTransitionOnContentChange)
{
if (RestartTransitionOnContentChange)
{
CurrentTransition.Completed += OnTransitionCompleted;
}
IsTransitioning = true;
VisualStateManager.GoToState(this, NormalState, false);
VisualStateManager.GoToState(this, GetTransitionName(Transition), true);
}
}
}