private static void OnTemplateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DependencyObject target = d;
if (e.OldValue != null)
{
InteractivityTemplate interactivityTemplate = (InteractivityTemplate)e.OldValue;
InteractivityItems interactivityItems = (InteractivityItems)interactivityTemplate.LoadContent();
BehaviorCollection behaviorCollection = Interaction.GetBehaviors(target);
TriggerCollection triggerCollection = Interaction.GetTriggers(target);
interactivityItems.Behaviors.ForEach(x => behaviorCollection.Remove(x));
interactivityItems.Triggers.ForEach(x => triggerCollection.Remove(x));
}
if (e.NewValue != null)
{
InteractivityTemplate interactivityTemplate = (InteractivityTemplate)e.NewValue;
interactivityTemplate.Seal();
InteractivityItems interactivityItems = (InteractivityItems)interactivityTemplate.LoadContent();
BehaviorCollection behaviorCollection = Interaction.GetBehaviors(target);
TriggerCollection triggerCollection = Interaction.GetTriggers(target);
interactivityItems.Behaviors.ForEach(behaviorCollection.Add);
interactivityItems.Triggers.ForEach(triggerCollection.Add);
}
}
/// <summary>
/// This is called when the triggers collection is altered via a Style.
/// </summary>
/// <param name="dpo"></param>
/// <param name="e"></param>
private static void OnTriggersPropertyChanged(DependencyObject dpo, DependencyPropertyChangedEventArgs e)
{
var uie = dpo as UIElement;
if (uie == null)
{
return;
}
// Get the old and new trigger set.
var oldTriggers = e.OldValue as IList <TriggerBase>;
var newTriggers = e.NewValue as IList <TriggerBase>;
// Get the actual System.Interaction collection
TriggerCollection itemTriggers = Interaction.GetTriggers(uie);
// Remove any old triggers
if (oldTriggers != null)
{
foreach (var trigger in oldTriggers)
{
if (newTriggers == null || !newTriggers.Contains(trigger))
{
itemTriggers.Remove(trigger);
}
}
}
// Add new triggers
if (newTriggers != null)
{
foreach (TriggerBase trigger in newTriggers)
{
if (!itemTriggers.Contains(trigger))
{
var thisTrigger = trigger;
if (thisTrigger.IsFrozen)
{
thisTrigger = (TriggerBase)trigger.Clone();
foreach (var a in trigger.Actions)
{
var thisAction = (TriggerAction)a.Clone();
thisTrigger.Actions.Add(thisAction);
}
}
itemTriggers.Add(thisTrigger);
}
}
}
}