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object.h

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2004 The ScummVM project
 *
 * 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.
 *
 * $Header: /cvsroot/scummvm/scummvm/gui/object.h,v 1.5 2004/01/06 12:45:29 fingolfin Exp $
 */

#ifndef GUI_OBJECT_H
#define GUI_OBJECT_H

namespace GUI {

class CommandReceiver;
class CommandSender;

class CommandReceiver {
      friend class CommandSender;
protected:
      virtual void handleCommand(CommandSender *sender, uint32 cmd, uint32 data) {}
};

class CommandSender {
      // TODO - allow for multiple targets, i.e. store targets in a list
      // and add methods addTarget/removeTarget.
protected:
      CommandReceiver   *_target;
public:
      CommandSender(CommandReceiver *target) : _target(target) {}

      void setTarget(CommandReceiver *target)   { _target = target; }
      CommandReceiver *getTarget() const        { return _target; }

      virtual void sendCommand(uint32 cmd, uint32 data) {
            if (_target && cmd)
                  _target->handleCommand(this, cmd, data);
      }
};

class Widget;

class GuiObject : public CommandReceiver {
      friend class Widget;
protected:
      int16       _x, _y;
      uint16            _w, _h;

      Widget            *_firstWidget;

public:
      GuiObject(int x, int y, int w, int h) : _x(x), _y(y), _w(w), _h(h), _firstWidget(0) { }

      virtual int16     getAbsX() const         { return _x; }
      virtual int16     getAbsY() const         { return _y; }
      virtual int16     getChildX() const { return getAbsX(); }
      virtual int16     getChildY() const { return getAbsY(); }
      virtual uint16    getWidth() const  { return _w; }
      virtual uint16    getHeight() const { return _h; }

      virtual bool      isVisible() const = 0;

      virtual void      draw() = 0;

protected:
      virtual void      releaseFocus() = 0;
};

} // End of namespace GUI

#endif

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