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ScrollBarWidget.h

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2005 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $Header: /cvsroot/scummvm/scummvm/gui/ScrollBarWidget.h,v 1.11.2.1 2005/10/18 02:11:18 sev Exp $
 */

#ifndef SCROLLBARWIDGET_H
#define SCROLLBARWIDGET_H

#include "gui/widget.h"

namespace GUI {

enum {
      kNormalScrollBarWidth   = 9,
      kBigScrollBarWidth            = 15
};


enum {
      kSetPositionCmd         = 'SETP'
};


class ScrollBarWidget : public Widget, public CommandSender {
protected:
      typedef enum {
            kNoPart,
            kUpArrowPart,
            kDownArrowPart,
            kSliderPart,
            kPageUpPart,
            kPageDownPart
      } Part;

      Part  _part;
      int         _sliderHeight;
      int         _sliderPos;

      Part  _draggingPart;
      int         _sliderDeltaMouseDownPos;

public:
      int         _numEntries;
      int         _entriesPerPage;
      int         _currentPos;

public:
      ScrollBarWidget(GuiObject *boss, int x, int y, int w, int h);

      void handleMouseDown(int x, int y, int button, int clickCount);
      void handleMouseUp(int x, int y, int button, int clickCount);
      void handleMouseWheel(int x, int y, int direction);
      void handleMouseMoved(int x, int y, int button);
      void handleMouseEntered(int button) { setFlags(WIDGET_HILITED); }
      void handleMouseLeft(int button)    { clearFlags(WIDGET_HILITED); _part = kNoPart; draw(); }
      void handleTickle();

      // FIXME - this should be private, but then we also have to add accessors
      // for _numEntries, _entriesPerPage and _currentPos. This again leads to the question:
      // should these accessors force a redraw?
      void recalc();

protected:
      void drawWidget(bool hilite);
      void checkBounds(int old_pos);
};

} // End of namespace GUI

#endif

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