/** DGui project file.

Copyright: Trogu Antonio Davide 2011-2013

License: $(HTTP boost.org/LICENSE_1_0.txt, Boost License 1.0).

Authors: Trogu Antonio Davide
*/
module dguihub.core.events.eventargs;

class EventArgs {
   private static EventArgs _empty;

   protected this() {

   }

   @property public static EventArgs empty() {
      if (!this._empty) {
         _empty = new EventArgs();
      }

      return _empty;
   }
}

class CancelEventArgs(T) : EventArgs {
   private bool _cancel = false;
   private T _t;

   public this(T t) {
      this._t = t;
   }

   @property public final bool cancel() {
      return this._cancel;
   }

   @property public final void cancel(bool b) {
      this._cancel = b;
   }

   @property public final T item() {
      return this._t;
   }
}

class ItemEventArgs(T) : EventArgs {
   private T _checkedItem;

   public this(T item) {
      this._checkedItem = item;
   }

   @property public T item() {
      return this._checkedItem;
   }
}

class ItemChangedEventArgs(T) : EventArgs {
   private T _oldItem;
   private T _newItem;

   public this(T oItem, T nItem) {
      this._oldItem = oItem;
      this._newItem = nItem;
   }

   @property public T oldItem() {
      return this._oldItem;
   }

   @property public T newItem() {
      return this._newItem;
   }
}