using System;
using MS.Internal.PresentationCore;
 
namespace System.Windows.Input 
{
    /// <summary>
    ///     The InputReportEventArgs class contains information about an input
    ///     report that is being processed.
    /// </summary>
    [FriendAccessAllowed]
    internal class InputReportEventArgs : InputEventArgs
    {
        /// <summary>
        ///     Initializes a new instance of the InputReportEventArgs class.
        /// </summary>
        /// <param name="inputDevice">
        ///     The input device to associate this input with.
        /// </param>
        /// <param name="report">
        ///     The input report being processed.
        /// </param>
        public InputReportEventArgs(InputDevice inputDevice, 
                                    InputReport report) : base(inputDevice, ((report != null) ? report.Timestamp : -1))
        {
            if (report == null)
                throw new ArgumentNullException("report");
 
            _report = report;
        }
 
        /// <summary>
        ///     Read-only access to the input report being processed.
        /// </summary>
        public InputReport Report
        {
            get {return _report;}
        }
 
        /// <summary>
        ///     The mechanism used to call the type-specific handler on the
        ///     target.
        /// </summary>
        /// <param name="genericHandler">
        ///     The generic handler to call in a type-specific way.
        /// </param>
        /// <param name="genericTarget">
        ///     The target to call the handler on.
        /// </param>
        protected override void InvokeEventHandler(Delegate genericHandler, object genericTarget)
        {
            InputReportEventHandler handler = (InputReportEventHandler) genericHandler;
            handler(genericTarget, this);
        }
 
        private InputReport _report;
    }
}