Property Events

/*
(c) 2005, Marc Clifton
All Rights Reserved
 
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list
of conditions and the following disclaimer. 

Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or other
materials provided with the distribution. 

Neither the name of the Marc Clifton, "MyXaml", "MycroXaml", nor the names
of its contributors may be used to endorse or promote products derived from this
software without specific prior written permission. 

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

using System;
using System.Collections;
using System.ComponentModel;
using System.Diagnostics;

namespace MyXaml.MxHelpers
{
	public class ControllerEventArgs : EventArgs
	{
		protected EventArgs e;
		protected bool qualified;

		public EventArgs EventArgs
		{
			get {return e;}
		}

		public bool IsQualified
		{
			get {return qualified;}
			set {qualified=value;}
		}

		public ControllerEventArgs(EventArgs e)
		{
			this.e=e;
			qualified=false;
		}
	}

	public class Controller : IController
	{
		protected string descr;
		protected IOnEvent onEvent;
		protected ConditionSet qualifiedBy;
		protected ActionSet actionSet;
		protected ActionSet elseAction;

		public string Description
		{
			get {return descr;}
			set {descr=value;}
		}

		public IOnEvent OnEvent
		{
			get {return onEvent;}
			set {onEvent=value;}
		}

		public ConditionSet QualifiedBy
		{
			get {return qualifiedBy;}
			set {qualifiedBy=value;}
		}

		public ActionSet Action
		{
			get {return actionSet;}
			set {actionSet=value;}
		}

		public ActionSet ElseAction
		{
			get {return elseAction;}
			set {elseAction=value;}
		}

		public void Initialize(IMxController masterController)
		{
			if (onEvent==null)
			{
				throw(new EventNullException("OnEvent is null."));
			}
			if (actionSet==null)
			{
				throw(new ActionSetNullException("ActionSet is null."));
			}

			onEvent.Triggered+=new OnEvent.ControllerEventHandler(OnTriggered);
			onEvent.WireUp(masterController);
		}

		protected void OnTriggered(object sender, ControllerEventArgs e)
		{
			Trace.WriteLine(descr);
			if (qualifiedBy != null)
			{
				if (qualifiedBy.IsQualified(sender))
				{
					actionSet.Set(sender);
					e.IsQualified=true;
				}

				if ( (!e.IsQualified) && (elseAction != null) )
				{
					elseAction.Set(sender);
					e.IsQualified=true;
				}
			}
			else
			{
				actionSet.Set(sender);
				e.IsQualified=true;
			}
		}
	}

	public class MxController : ISupportInitialize, IMxController
	{
		protected ArrayList controllers;

		public ArrayList Controllers
		{
			get {return controllers;}
		}

		public MxController()
		{
			controllers=new ArrayList();
		}

		public void Fire(IOnEvent onEvent, EventArgs e)
		{
			ControllerEventArgs cea=new ControllerEventArgs(e);
			object[] args=new object[] {onEvent.Object, cea};
			foreach(Delegate sink in onEvent.InvocationList)
			{
				try
				{
					// process any controller that is unqualified or has no qualifying logic.
					if ( (((IController)sink.Target).QualifiedBy == null) || (!cea.IsQualified) )
					{
						sink.DynamicInvoke(args);
					}
				}
				catch(Exception ex)
				{
					throw(new ControllerEventException(ex.InnerException.ToString()));
				}
			}
		}

		public virtual void BeginInit()
		{
		}

		public virtual void EndInit()
		{
			foreach(IController controller in controllers)
			{
				controller.Initialize(this);
			}
		}
	}
}