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//
// System.Drawing.Message.cs
//
// Author:
//   Dennis Hayes (dennish@raytek.com)
//
// (C) 2002 Ximian, Inc.  http://www.ximian.com
//
//TODO uncomment and implment GetLParam.
using System;

namespace System.Windows.Forms{
  [Serializable]
  public struct Message { 

    private int msg;
    private IntPtr hwnd;
    private IntPtr lparam;
    private IntPtr wparam;
    private IntPtr result;


    // -----------------------
    // Public Shared Members
    // -----------------------

    /// <summary>
    ///  Equality Operator
    /// </summary>
    ///
    /// <remarks>
    ///  Compares two Message objects. The return value is
    ///  based on the equivalence of the Msg, HWnd, LParam,
    ///   WParam, and Result properties of the two objects.
    /// </remarks>

    public static bool operator == (Message msg_a, 
      Message msg_b) {

      return ((msg_a.msg == msg_b.msg) &&
        (msg_a.hwnd == msg_b.hwnd) &&
        (msg_a.lparam == msg_b.lparam) &&
        (msg_a.wparam == msg_b.wparam) &&
        (msg_a.result == msg_b.result));
    }
    
    /// <summary>
    ///  Inequality Operator
    /// </summary>
    ///
    /// <remarks>
    ///  Compares two Message objects. The return value is
    ///  based on the equivalence of the Msg, HWnd, LParam,
    ///   WParam, and Result properties of the two objects.
    /// </remarks>

    public static bool operator != (Message msg_a, 
      Message msg_b) {
      return ((msg_a.msg != msg_b.msg) ||
        (msg_a.hwnd != msg_b.hwnd) ||
        (msg_a.lparam != msg_b.lparam) ||
        (msg_a.wparam != msg_b.wparam) ||
        (msg_a.result != msg_b.result));
    }
    
    // -----------------------
    // Public Instance Members
    // -----------------------

    public int Msg {
      get{
        return msg;
      }
      set{
        msg = value;
      }
    }

    public IntPtr HWnd {
      get{
        return hwnd;
      }
      set{
        hwnd = value;
      }
    }

    public IntPtr LParam {
      get{
        return lparam;
      }
      set{
        lparam = value;
      }
    }

    public IntPtr WParam {
      get{
        return wparam;
      }
      set{
        wparam = value;
      }
    }

    public IntPtr Result {
      get{
        return result;
      }
      set{
        result = value;
      }
    }

    public static Message create(IntPtr hWnd, int msg, IntPtr wparam, IntPtr lparam)
    {
      Message NewMessage =  new Message();
      NewMessage.msg = msg;
      NewMessage.wparam = wparam;
      NewMessage.lparam = lparam;
      NewMessage.hwnd = hWnd;
      return NewMessage;
    }

    /// <summary>
    ///  Equals Method
    /// </summary>
    ///
    /// <remarks>
    ///  Checks equivalence of this Message and another object.
    /// </remarks>
    
    public override bool Equals (object obj)
    {
      if (!(obj is Message))
        return false;

      return (this == (Message) obj);
    }

    /// <summary>
    ///  GetHashCode Method
    /// </summary>
    ///
    /// <remarks>
    ///  Calculates a hashing value.
    /// </remarks>
    
    public override int GetHashCode ()
    {
      return base.GetHashCode();// (int)( msg ^ lparam ^ wparam ^ result ^ whnd);
    }

    /// <summary>
    ///  ToString Method
    /// </summary>
    ///
    /// <remarks>
    ///  Formats the Message as a string.
    /// </remarks>
    
    public override string ToString ()
    {
      return String.Format ("[{0},{1},{2},{3},{4}]", msg.ToString(), lparam.ToString(), wparam.ToString(), result.ToString(), hwnd.ToString());
    }

//    public object GetLParam(Type cls){
//      //  throw new NotImplementedException ();
//      //return (object) lparam;
//    }
  }
}