/// <summary>
/// Attaches an event to the first Parent of obj (which must be a
/// FrameworkElement) which declares a public method with the name
/// "handler" and arguments of types "types".
///
/// When that method is found, attacher is invoked with:
/// - sender is "obj"
/// - target is the Parent that declares the method
/// - method is the method of Parent
/// </summary>
/// <param name="obj">the object to which to attach an event</param>
/// <param name="handler">the name of the method to be found in some Parent of obj</param>
/// <param name="attacher">indicates how to attach an event to the target</param>
public static void AttachEventHandler(DependencyObject obj, string methodName, Type[] handlerTypes, EventAttacher attacher)
{
FrameworkElement element = obj as FrameworkElement;
if (element == null)
throw new ArgumentException("Can only attach events to FrameworkElement instances, not to '" + obj.GetType() + "'");
element.Loaded += (sender, e) =>
{
DependencyObject parent = sender as DependencyObject;
MethodInfo info = null;
while (info == null)
{
info = parent.GetType().GetMethod(methodName, handlerTypes);
if (info != null)
{
attacher(sender, parent, info);
return;
}
parent = (parent is FrameworkElement) ? ((FrameworkElement)parent).Parent : null;
if (parent == null)
throw new ArgumentException("Can't find handler '" + methodName + "' (maybe it's not public, or set in a ControlTemplate?)");
}
};
}
/// <summary>
/// Attaches an event to the first Parent of obj (which must be a
/// FrameworkElement) which declares a public method with the name
/// "handler" and arguments of types "types".
///
/// When that method is found, attacher is invoked with:
/// - sender is "obj"
/// - target is the Parent that declares the method
/// - method is the method of Parent
/// </summary>
/// <param name="obj">the object to which to attach an event</param>
/// <param name="handler">the name of the method to be found in some Parent of obj</param>
/// <param name="attacher">indicates how to attach an event to the target</param>
public static void AttachEvent(DependencyObject obj, string handler, Type[] types, EventAttacher attacher)
{
FrameworkElement fe = obj as FrameworkElement;
if (fe == null)
{
throw new ArgumentException("Can only attach events to FrameworkElement instances, not to '" + obj.GetType() + "'");
}
fe.Loaded += (sender, e) =>
{
DependencyObject parent = sender as DependencyObject;
MethodInfo info = null;
while (info == null)
{
info = parent.GetType().GetMethod(handler, types);
if (info != null)
{
attacher(sender, parent, info);
return;
}
if (parent is FrameworkElement)
{
parent = (parent as FrameworkElement).Parent;
}
else
{
parent = null;
}
if (parent == null)
{
throw new ArgumentException("Can't find handler '" + handler + "' (maybe it's not public?)");
}
}
};
}
protected override void SubRevoke(IEntity tVar)
{
this.eaAttacher = null;
}
public EventAttachService(EventAttacher ea)
{
this.eaAttacher = ea;
}
/// <summary>
/// Attaches an event to the first Parent of obj (which must be a
/// FrameworkElement) which declares a public method with the name
/// "handler" and arguments of types "types".
///
/// When that method is found, attacher is invoked with:
/// - sender is "obj"
/// - target is the Parent that declares the method
/// - method is the method of Parent
/// </summary>
/// <param name="obj">the object to which to attach an event</param>
/// <param name="handler">the name of the method to be found in some Parent of obj</param>
/// <param name="attacher">indicates how to attach an event to the target</param>
public static void AttachEvent(DependencyObject obj, string handler, Type[] types, EventAttacher attacher)
{
FrameworkElement fe = obj as FrameworkElement;
if (fe == null)
{
throw new ArgumentException("Can only attach events to FrameworkElement instances, not to '" + obj.GetType() + "'");
}
fe.Loaded += (sender, e) =>
{
DependencyObject parent = sender as DependencyObject;
MethodInfo info = null;
while (info == null)
{
info = parent.GetType().GetMethod(handler, types);
if (info != null)
{
attacher(sender, parent, info);
return;
}
if (parent is FrameworkElement)
{
parent = (parent as FrameworkElement).Parent;
}
else
{
parent = null;
}
if (parent == null)
{
throw new ArgumentException("Can't find handler '" + handler + "' (maybe it's not public?)");
}
}
};
}
