/// <summary>
/// Raised when the action's target object changes. Removes the behavior from the previous target
/// and adds it to the new one.
/// </summary>
protected override void OnTargetChanged(DependencyObject oldTarget, DependencyObject newTarget)
{
base.OnTargetChanged(oldTarget, newTarget);
// Detach behavior from previous target
if (oldTarget != null)
{
BehaviorCollection behaviors = Interaction.GetBehaviors(oldTarget);
if (behaviors.Contains(Behavior))
{
behaviors.Remove(Behavior);
}
}
// Attach behavior to the new target, making sure that the new target is of the behavior's
// target type.
if (newTarget != null && isTargetTypeValid(newTarget, Behavior.GetType()))
{
BehaviorCollection behaviors = Interaction.GetBehaviors(newTarget);
if (!behaviors.Contains(Behavior))
{
behaviors.Add(Behavior);
}
}
}
/// <summary>
/// Raised when the action is executed. Attempts to add the Behavior to the target object's
/// behaviors collection.
/// </summary>
/// <param name="parameter"></param>
protected override void Invoke(object parameter)
{
// Make sure that both the target and behavior are non-null, and that the target matches the
// behavior's target type
if ((Target != null) && (Behavior != null) && isTargetTypeValid(Target, Behavior.GetType()))
{
// Add the behavior to the target object's behaviors collection
BehaviorCollection behaviors = Interaction.GetBehaviors(Target);
if (!behaviors.Contains(Behavior))
{
behaviors.Add(Behavior);
}
}
}
/// <summary>
/// This is called when the behaviors collection is altered via a Style.
/// </summary>
/// <param name="dpo"></param>
/// <param name="e"></param>
private static void OnBehaviorsPropertyChanged(DependencyObject dpo, DependencyPropertyChangedEventArgs e)
{
var uie = dpo as UIElement;
if (uie == null)
{
return;
}
// Get the old and new behaviors.
var oldBehaviors = e.OldValue as IList <Behavior>;
var newBehaviors = e.NewValue as IList <Behavior>;
// Get the actual System.Interaction collection.
BehaviorCollection itemBehaviors = Interaction.GetBehaviors(uie);
// Remove any missing behaviors.
if (oldBehaviors != null)
{
foreach (var behavior in oldBehaviors)
{
if (newBehaviors == null || !newBehaviors.Contains(behavior))
{
itemBehaviors.Remove(behavior);
}
}
}
// Add any new behaviors.
if (newBehaviors != null)
{
foreach (var behavior in newBehaviors)
{
if (!itemBehaviors.Contains(behavior))
{
var thisBehavior = behavior;
if (thisBehavior.IsFrozen)
{
thisBehavior = (Behavior)behavior.Clone();
}
itemBehaviors.Add(thisBehavior);
}
}
}
}
private void addRemoveMapBehavior(ExtensionBehavior extensionBehavior)
{
if (MapApplication.Current == null && MapApplication.Current.Map != null)
{
return;
}
BehaviorCollection behaviors = Interaction.GetBehaviors(MapApplication.Current.Map);
if (behaviors == null)
{
return;
}
Behavior <Map> mapBehavior = extensionBehavior.MapBehavior as Behavior <Map>;
if (mapBehavior == null)
{
mapBehavior = BehaviorUtils.GetMapBehavior(extensionBehavior);
extensionBehavior.MapBehavior = mapBehavior;
}
if (mapBehavior == null)
{
return;
}
if (extensionBehavior.IsEnabled)
{
if (!behaviors.Contains(mapBehavior))
{
behaviors.Add(mapBehavior);
}
}
else
{
behaviors.Remove(mapBehavior);
}
}