poison.core.eventhandler source code

1 /**
2 * Module for event handlers.
3 *
4 * Authors:
5 *   Jacob Jensen
6 * License:
7 *   https://github.com/PoisonEngine/poison-ui/blob/master/LICENSE
8 */
9 module poison.core.eventhandler;
10 
11 import poison.core.eventargs;
12 
13 /// A base event handler.
14 interface IBaseEventHandler { }
15 
16 /// An event handler.
17 class EventHandler(TEventArgs : EventArgs) : IBaseEventHandler {
18   private:
19   /// The function pointer of the event handler.
20   void function(TEventArgs) _f;
21 
22   /// The delegate of the event handler.
23   void delegate(TEventArgs) _d;
24 
25   public:
26   /**
27   * Creates a new event handler.
28   * Params:
29   *   f = The function pointer.
30   */
31   this(void function(TEventArgs) f) {
32     _f = f;
33   }
34 
35   /**
36   * Creates a new event handler.
37   * Params:
38   *   d = The delegate.
39   */
40   this(void delegate(TEventArgs) d) {
41     _d = d;
42   }
43 
44   /**
45   * Operator overload for calling the event handler implicit.
46   * Params:
47   *   e = The event args.
48   */
49   void opCall(TEventArgs e) {
50     if (_f) {
51       _f(e);
52     }
53     else if (_d) {
54       _d(e);
55     }
56   }
57 }