private void FindStoryboard(string stateName)
{
DisposeEventHandlers();
var groups = VisualStateManager.GetVisualStateGroups(LayoutRootPart);
var transitionState = (from VisualStateGroup visualStateGroup in groups
from VisualState state in visualStateGroup.States
where visualStateGroup.Name == TransitionStatesGroupName
where state.Name == stateName
select state).FirstOrDefault();
if (transitionState == null)
{
return;
}
switch (stateName)
{
case BeforeLoadedStateName:
beforeLoadedEvents = new WeakStoryboardEvents(this, transitionState.Storyboard);
break;
case LoadedStateName:
loadedEvents = new WeakStoryboardEvents(this, transitionState.Storyboard);
break;
case UnloadedStateName:
unloadedEvents = new WeakStoryboardEvents(this, transitionState.Storyboard);
break;
}
}
private void DisposeEventHandlers()
{
if (beforeLoadedEvents != null)
{
beforeLoadedEvents.Dispose();
beforeLoadedEvents = null;
}
if (loadedEvents != null)
{
loadedEvents.Dispose();
loadedEvents = null;
}
if (unloadedEvents != null)
{
unloadedEvents.Dispose();
unloadedEvents = null;
}
}