text: /*
   * Events.h
   *
   * Copyright (c) 2015, Peter Macko
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   * 
   * 1. Redistributions of source code must retain the above copyright notice, 
   * this list of conditions and the following disclaimer.
   * 
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   * this list of conditions and the following disclaimer in the documentation
   * and/or other materials provided with the distribution.
   * 
   * 3. Neither the name of the copyright holder nor the names of its
   * contributors may be used to endorse or promote products derived from this
   * software without specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   * THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  
  #ifndef __EVENTS_H
  #define __EVENTS_H
  
  // Forward declarations
  class Component;
  
  
  /**
   * An event handler
   *
   * @author Peter Macko
   */
  class EventHandler
  {
  	friend class Component;
  
  
  protected:
  
  	/**
  	 * Create an instance of class EventHandler
  	 */
  	inline EventHandler() {}
  
  	/**
  	 * An event handler for an action
  	 *
  	 * @param sender the sender
  	 */
  	virtual void OnAction(Component* sender) {}
  
  	/**
  	 * An event handler for value changed
  	 *
  	 * @param sender the sender
  	 */
  	virtual void OnValueChanged(Component* sender) {}
  
  
  public:
  
  	/**
  	 * Destroy the event handler
  	 */
  	virtual ~EventHandler() {}
  };
  
  
  #endif
  