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/****************************************************************************
*
* Copyright (c) 1996-2022 Vladi Belperchinov-Shabanski "Cade"
* http://cade.noxrun.com/ <cade@noxrun.com> <cade@bis.bg> <cade@cpan.org>
*
* SEE `README',`LICENSE' OR `COPYING' FILE FOR LICENSE AND OTHER DETAILS!
*
****************************************************************************/
#ifndef _SCROLL_H_
#define _SCROLL_H_
class ScrollPos
{
int _min;
int _max;
int _pos;
int _page;
int _pagesize;
/*
_pagestep -- step to change page on up/down out of the current page
if _pagestep is between 0 and 1 it is considered percentage of _pagesize
(with minimum step of 1)
if _pagestep is 1 or above it is considered integer fixed step
(limited to size of _pagesize)
*/
double _pagestep;
int _size;
void fix();
int check();
public:
int wrap; // 0 -- none, else -- wrap end/begin; NOTE: works only on up/down
ScrollPos()
{
wrap = _min = _max = _pos = _page = _pagesize = _size = 0;
_pagestep = 1;
};
void set_min_max( int a_min, int a_max )
{ _min = a_min; _max = a_max; _size = _max - _min + 1; }
void set_pos( int a_pos )
{ _pos = a_pos; }
void set_page( int a_page )
{ _page = a_page; }
void set_pagesize( int a_pagesize )
{ _pagesize = a_pagesize;
if( _pagesize < 0 ) _pagesize = 0;
if( _pagestep >= 1 and _pagestep > _pagesize ) _pagestep = _pagesize; }
void set_pagestep( double a_pagestep )
{ _pagestep = a_pagestep;
if( _pagestep <= 0 ) _pagestep = 1; }
int min() { return _min; }
int max() { return _max; }
int pos() { if ( ! _size ) return 0; return _pos; }
int page() { if ( ! _size ) return 0; return _page; }
int pagesize() { return _pagesize; }
int step() { return _pagestep; }
void home();
void end();
void up();
void down();
void pageup();
void pagedown();
void ppage() { pageup(); }
void npage() { pagedown(); }
void go( int new_pos );
};
#endif //_SCROLL_H_
// eof scroll.h
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