eventresponder.h

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/*
 * Vega Strike
 * Copyright (C) 2003 Mike Byron
 *
 * http://vegastrike.sourceforge.net/
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifndef __EVENTRESPONDER_H__
#define __EVENTRESPONDER_H__

//See cpp file for detailed descriptions of classes, functions, etc.

#include "guidefs.h"
#include <string>

//The type of a command
typedef std::string EventCommandId;

//Forward reference
class Control;

//The EventResponder class is a virtual base class that allows objects
//to intercept and respond to input and command events. This class is
//used in conjunction with the EventManager.

class EventResponder
{
public:
//PROCESS COMMAND
//Process a command event.
    virtual bool processCommand( const EventCommandId &command, Control *control );

//PROCESS KEYBOARD
//Process a key pressed down.
    virtual bool processKeyDown( const InputEvent &event );

//Process a key released.
    virtual bool processKeyUp( const InputEvent &event );

//PROCESS MOUSE
//Process a mouse button pressed down.
    virtual bool processMouseDown( const InputEvent &event );

//Called for every click except those landing on the control.
    virtual void processUnfocus( const InputEvent &event );

//Process a mouse button released.
    virtual bool processMouseUp( const InputEvent &event );

//Process a mouse location change.
    virtual bool processMouseMove( const InputEvent &event );

//Process a mouse location change when at least one mouse button is down.
    virtual bool processMouseDrag( const InputEvent &event );

//CODE-GENERATED EVENTS.
//Send a command event into the event chain.
    virtual void sendCommand( const EventCommandId &command, Control *control );

//Set a specified target for commands.  Commands aren't forwarded into the
//event chain, they are sent to this specific target.  This can be used, for
//instance, to tie two controls tightly together.
//Use NULL to clear the target and forward commands into the event chain.
    virtual void setCommandTarget( EventResponder *responder );

//BEHAVIOR
//Handle all input events.  Don't forward anything down the event chain.
    virtual void setModal( bool modal );

//CONSTRUCTION
public: EventResponder( void );
    virtual ~EventResponder( void );

//VARIABLES
protected:
    bool m_modal;                   //true = This window "traps" all events -- events don't go to other windows.
    EventResponder *m_commandTarget; //Forward events to this particular responder, not the event chain.
};

#endif   //__EVENTRESPONDER_H__