src/progress_bar.c

   1 /* ncmpc (Ncurses MPD Client)
   2  * (c) 2004-2017 The Music Player Daemon Project
   3  * Project homepage: http://musicpd.org
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #include "progress_bar.h"
  21
  22 #include <assert.h>
  23
  24 void
  25 progress_bar_paint(const struct progress_bar *p)
  26 {
  27         assert(p != NULL);
  28
  29         mvwhline(p->window.w, 0, 0, ACS_HLINE, p->window.cols);
  30
  31         if (p->max > 0) {
  32                 assert(p->width < p->window.cols);
  33
  34                 if (p->width > 0)
  35                         whline(p->window.w, '=', p->width);
  36
  37                 mvwaddch(p->window.w, 0, p->width, 'O');
  38         }
  39
  40         wnoutrefresh(p->window.w);
  41 }
  42
  43 static bool
  44 progress_bar_calc(struct progress_bar *p)
  45 {
  46         if (p->max == 0)
  47                 return false;
  48
  49         unsigned old_width = p->width;
  50         p->width = (p->window.cols * p->current) / (p->max + 1);
  51         assert(p->width < p->window.cols);
  52
  53         return p->width != old_width;
  54 }
  55
  56 void
  57 progress_bar_resize(struct progress_bar *p, unsigned width, int y, int x)
  58 {
  59         assert(p != NULL);
  60
  61         p->window.cols = width;
  62         wresize(p->window.w, 1, width);
  63         mvwin(p->window.w, y, x);
  64
  65         progress_bar_calc(p);
  66 }
  67
  68 bool
  69 progress_bar_set(struct progress_bar *p, unsigned current, unsigned max)
  70 {
  71         assert(p != NULL);
  72
  73         if (current > max)
  74                 current = max;
  75
  76         bool modified = (max == 0) != (p->max == 0);
  77
  78         p->max = max;
  79         p->current = current;
  80
  81         return progress_bar_calc(p) || modified;
  82 }