/*      _______   __   __   __   ______   __   __   _______   __   __                 
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\                
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /                 
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /                  
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /                   
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /                    
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/                      
 *
 * Copyright (c) 2004, 2005 darkbits                        Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
 *                                               .)j(] .d_/ '-(  P .   S
 * License: (BSD)                                <Td/Z <fP"5(\"??"\a.  .L
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 * modification, are permitted provided         _Q-5'5W..j/?'   -?!\)cam'
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 * 1. Redistributions of source code must       .$%w\/]Q  . ."'  .  mj$
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 */

#ifndef GCN_KEYLISTENER_HPP
#define GCN_KEYLISTENER_HPP

#include <string>

#include "guichan/key.h"
#include "guichan/platform.h"

namespace gcn
{
    /**
     * Key listeners base class. Inorder to use this class you must inherit
     * from it and implements it's functions. KeyListeners listen for key
     * events on a Widgets. When a Widget recives a key event, the
     * corresponding function in all it's key listeners will be called.
     * Only focused Widgets will generate key events.
     *
     * @see Widget::addKeyListener
     */
    class GCN_CORE_DECLSPEC KeyListener
    {
    public:

        /**
         * Destructor
         */
        virtual ~KeyListener() { }
    
        /**
         * Called if a key is pressed when the widget has keyboard focus.
         * If a key is held down the widget will generate multiple key
         * presses.
         *
         * @param key the key pressed.
         *
         * @return true if this function handled the message; false if
         * the caller should try FocusHandler::checkHotKey instead.
         */
        virtual bool keyPress(const Key& key) { return false; }

        /**
         * Called if a key is released when the widget has keyboard focus.
         *
         * @param key the key released.
         *
         * @return true if this function handled the message; false if
         * the caller should try FocusHandler::checkHotKey instead.
         */
        virtual bool keyRelease(const Key& key) { return false; }

    protected:
        /**
         * Constructor.
         *
         * You should not be able to make an instance of KeyListener,
         * therefore its constructor is protected. To use KeyListener
         * you must inherit from this class and implement it's
         * functions.
         */            
        KeyListener() { }
    };
}

#endif // end GCN_KEYLISTENER_HPP
