golgotha/i4/gui/scroll_bar.hh

/********************************************************************** <BR>
  This file is part of Crack dot Com's free source code release of
  Golgotha. <a href="http://www.crack.com/golgotha_release"> <BR> for
  information about compiling & licensing issues visit this URL</a> 
  <PRE> If that doesn't help, contact Jonathan Clark at 
  golgotha_source@usa.net (Subject should have "GOLG" in it) 
***********************************************************************/

#ifndef SCROLL_BAR_HH
#define SCROLL_BAR_HH

#include "device/event.hh"
#include "window/window.hh"

class i4_button_class;
class i4_graphical_style_class;

class i4_scroll_message : public i4_user_message_event_class
{
public:
  sw32 amount;
  sw32 scroll_total;

  i4_scroll_message(sw32 amount, sw32 scroll_total, w32 id)
    : amount(amount), scroll_total(scroll_total),
      i4_user_message_event_class(id)

  {}

  virtual i4_event *copy() { return new i4_scroll_message(amount, scroll_total, sub_type); } 
};



class i4_scroll_button;

class i4_scroll_bar : public i4_parent_window_class        // up-down scroll bar
{
  friend class i4_scroll_button;
  i4_graphical_style_class *style;
  w32 total_scroll_objects, total_visible_objects;
  i4_button_class *up_but, *down_but, *left_but, *right_but;
  i4_scroll_button *scroll_but;
  i4_parent_window_class *scroll_area;
  w32 id,pos;
  i4_event_handler_class *send_to;
  i4_bool vertical;

  i4_button_class *create_button(i4_button_class *&b, i4_image_class *im);
public:
  void send_position();
  void set_bar_pos(sw32 pos);
  void calc_pos();
  void set_new_total(int total);              // if total items under control changes
  i4_scroll_bar(i4_bool vertical,
                int max_dimention_size,      // width/height depending on vertical
                int total_visible_objects,   // used to determine scroll bar dragger size
                int total_scroll_objects,    // total number of objects that will be scrolled
                w32 message_id,
                i4_event_handler_class *send_to,
                i4_graphical_style_class *style);

  virtual void receive_event(i4_event *ev);

  char *name() { return "vscroll_bar"; }
};


#endif