//  This may look like C code, but it is really -*- C++ -*-

//  ------------------------------------------------------------------
//  The Goldware Library
//  Copyright (C) 1990-1999 Odinn Sorensen
//  ------------------------------------------------------------------
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Library General Public
//  License as published by the Free Software Foundation; either
//  version 2 of the License, or (at your option) any later version.
//
//  This library 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
//  Library General Public License for more details.
//
//  You should have received a copy of the GNU Library 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
//  ------------------------------------------------------------------
//  $Id: gwinpick.h,v 1.2 2001/03/17 21:17:57 asa Exp $
//  ------------------------------------------------------------------
//  Pick engine.
//  ------------------------------------------------------------------

#ifndef __gwinpick_h
#define __gwinpick_h


//  ------------------------------------------------------------------

#include <gkbdbase.h>


//  ------------------------------------------------------------------
//  Constants

const int PICK_DISP = 0;
const int PICK_BAR  = 1;

const int LIST_BOTTOM      = -2;
const int LIST_NEARBOTTOM  = -1;
const int LIST_MIDDLE      = 0;
const int LIST_NEARTOP     = 1;
const int LIST_TOP         = 2;


//  ------------------------------------------------------------------

class gwinpick {

private:

protected:

  gkey key;
  bool keyok;

  void cursor_up();
  void cursor_down();
  void cursor_pageup();
  void cursor_pagedown();
  void cursor_first();
  void cursor_last();
  void cursor_scroll_up();
  void cursor_scroll_down();

  void update_cursor();

  void display_line(bool bar=false);
  void display_page();
  bool default_handle_key();

  inline void update() { display_page(); };

public:

  uint  ypos;                                 // Window Starting Row
  uint  xpos;                                 // Window Starting Column
  uint  ylen;                                 // Window Height
  uint  xlen;                                 // Window Width
  int   btype;                                // Window Border Type
  int   battr;                                // Window Border Color
  int   wattr;                                // Window Color
  int   tattr;                                // Window Title Color
  int   sattr;                                // Window Selection Bar Color
  int   hattr;                                // Window Highlight Color
  int   loattr;                               // Window LoAttr Color
  int   sbattr;                               // Window Scrollbar Color
  const char* title;                          // Window Title
  int   helpcat;                              // Window Help Category
  uint  maximum_index;                        // List Entries - 1
  uint  minimum_index;                        // Minimum index in the list
  uint  maximum_position;                     // Display Pos
  uint  index;                                // List Index
  uint  position;                             // Display Pos
  bool  aborted;                              // True if aborted
  bool  listwrap;                             // True if wrap-around is supported
  int   direction;                            // 1 if next, -1 if previous

  virtual void open();                        // Called after window is opened
  virtual void close();                       // Called after window is closed
  virtual void precursor();                   // Called before any cursor movement
  virtual void do_delayed();                  // Called after a delay
  virtual void print_line(uint idx, uint pos, bool isbar) = 0;
  virtual void scroll(int where);             // Scroll page
  virtual bool handle_key();                  // Handles keypress
  virtual bool is_selectable(uint idx);       // returns true if selectable

  void display_bar()  { display_line(true); }
  void center(int listmode);

  int run_picker();

  gwinpick();
  virtual ~gwinpick() { };
};


//  ------------------------------------------------------------------

#endif

//  ------------------------------------------------------------------
