/// <summary>
/// Change handler for the event name
/// </summary>
/// <param name="dpo">VMTrigger object</param>
/// <param name="e">EventArgs</param>
private static void OnTargetChanged(DependencyObject dpo, DependencyPropertyChangedEventArgs e)
{
ViewModelTrigger vmt = (ViewModelTrigger)dpo;
object oldTarget = e.OldValue;
if (oldTarget != null)
{
vmt.Unregister(oldTarget, vmt.EventName);
}
vmt.Register(vmt.Target, vmt.EventName);
}
/// <summary>
/// Change handler for the event name
/// </summary>
/// <param name="dpo">VMTrigger object</param>
/// <param name="e">EventArgs</param>
private static void OnEventNameChanged(DependencyObject dpo, DependencyPropertyChangedEventArgs e)
{
ViewModelTrigger vmt = (ViewModelTrigger)dpo;
string oldEventName = e.OldValue as string;
if (!string.IsNullOrEmpty(oldEventName))
{
vmt.Unregister(vmt.Target, oldEventName);
}
vmt.Register(vmt.Target, vmt.EventName);
}
/// <summary>
/// Change handler for IViewModelTrigger.
/// </summary>
/// <param name="dpo">VMTrigger object</param>
/// <param name="e">EventArgs</param>
private static void OnTriggerChanged(DependencyObject dpo, DependencyPropertyChangedEventArgs e)
{
ViewModelTrigger vmt = (ViewModelTrigger)dpo;
IViewModelTrigger ivm = e.OldValue as IViewModelTrigger;
if (ivm != null)
{
ivm.Execute -= vmt.TriggerRaised;
}
ivm = e.NewValue as IViewModelTrigger;
if (ivm != null)
{
ivm.Execute += vmt.TriggerRaised;
}
}
/// <summary>
/// Change handler for the event name
/// </summary>
/// <param name="dpo">VMTrigger object</param>
/// <param name="e">EventArgs</param>
private static void OnTargetChanged(DependencyObject dpo, DependencyPropertyChangedEventArgs e)
{
ViewModelTrigger vmt = (ViewModelTrigger)dpo;
if (string.IsNullOrEmpty(vmt.EventName))
{
return;
}
object oldTarget = e.OldValue;
if (oldTarget != null)
{
vmt.UnregisterEvent(oldTarget, vmt.EventName);
}
vmt.RegisterEvent(vmt.Target, vmt.EventName);
}
