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//
// System.ComponentModel.EventDescriptor.cs
//
// Authors:
// Lluis Sanchez Gual (lluis@ximian.com)
//
// (C) Novell, Inc. 2004, 2005
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Runtime.InteropServices;
using System.Collections;
using System.Reflection;
namespace System.ComponentModel
{
internal class ReflectionEventDescriptor: EventDescriptor
{
Type _eventType;
Type _componentType;
EventInfo _eventInfo;
MethodInfo add_method;
MethodInfo remove_method;
public ReflectionEventDescriptor (EventInfo eventInfo) : base (eventInfo.Name, (Attribute[]) eventInfo.GetCustomAttributes (true))
{
_eventInfo = eventInfo;
_componentType = eventInfo.DeclaringType;
_eventType = eventInfo.EventHandlerType;
add_method = eventInfo.GetAddMethod ();
remove_method = eventInfo.GetRemoveMethod ();
}
public ReflectionEventDescriptor (Type componentType, EventDescriptor oldEventDescriptor, Attribute[] attrs) : base (oldEventDescriptor, attrs)
{
_componentType = componentType;
_eventType = oldEventDescriptor.EventType;
EventInfo event_info = componentType.GetEvent (oldEventDescriptor.Name);
add_method = event_info.GetAddMethod ();
remove_method = event_info.GetRemoveMethod ();
}
public ReflectionEventDescriptor (Type componentType, string name, Type type, Attribute[] attrs) : base (name, attrs)
{
_componentType = componentType;
_eventType = type;
EventInfo event_info = componentType.GetEvent (name);
add_method = event_info.GetAddMethod ();
remove_method = event_info.GetRemoveMethod ();
}
EventInfo GetEventInfo ()
{
if (_eventInfo == null) {
_eventInfo = _componentType.GetEvent (Name);
if (_eventInfo == null)
throw new ArgumentException ("Accessor methods for the " + Name + " event are missing");
}
return _eventInfo;
}
public override void AddEventHandler (object component, System.Delegate value)
{
add_method.Invoke (component, new object [] { value });
}
public override void RemoveEventHandler (object component, System.Delegate value)
{
remove_method.Invoke (component, new object [] { value });
}
public override System.Type ComponentType
{
get { return _componentType; }
}
public override System.Type EventType
{
get { return _eventType; }
}
public override bool IsMulticast
{
get { return GetEventInfo().IsMulticast; }
}
}
}
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