using System; using System.Collections.Generic; using System.Text; namespace SilverlightCairngorm.Control { /// <summary> /// Used to dispatch system events, by raising an event that the /// controller class subscribes to every time any system event is /// raised. /// Client code has no need to use this class. (internal class) /// </summary> internal class CairngormEventDispatcher { private static readonly CairngormEventDispatcher _instance = new CairngormEventDispatcher(); // Explicit static constructor to tell C# compiler // not to mark type as beforefieldinit static CairngormEventDispatcher() { } /// <summary> /// private constructor /// </summary> private CairngormEventDispatcher() { } /// <summary> /// Returns the single instance of the dispatcher /// </summary> /// <returns>single instance of the dispatcher</returns> public static CairngormEventDispatcher Instance { get { return _instance; } } /// <summary> /// The subscriber to a system event must accept as argument /// the CairngormEvent raised (within a CairngormEventArgs\ /// object) /// </summary> /// <param name="sender">Unused</param> /// <param name="args">a CairngormEventArgs object, containing the raised event object</param> public delegate void EventDispatchDelegate(object sender, CairngormEventArgs args); /// <summary> /// The single event raised whenever a Cairngorm system event occurs /// </summary> public event EventDispatchDelegate EventDispatched = delegate { }; /// <summary> /// dispatchEvent raises a normal .net event, containing the /// instance of the CairngormEvent raised - to be handled by /// the Controller Class /// </summary> /// <param name="cairngormEvent">the raised Cairngorm Event</param> public void dispatchEvent(CairngormEvent cairngormEvent) { CairngormEventArgs args = new CairngormEventArgs(cairngormEvent); EventDispatched(null, args); } } }
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