lib/widget/gauge.c

   1 /*
   2    Widgets for the Midnight Commander
   3
   4    Copyright (C) 1994-2024
   5    Free Software Foundation, Inc.
   6
   7    Authors:
   8    Radek Doulik, 1994, 1995
   9    Miguel de Icaza, 1994, 1995
  10    Jakub Jelinek, 1995
  11    Andrej Borsenkow, 1996
  12    Norbert Warmuth, 1997
  13    Andrew Borodin <aborodin@vmail.ru>, 2009-2022
  14
  15    This file is part of the Midnight Commander.
  16
  17    The Midnight Commander is free software: you can redistribute it
  18    and/or modify it under the terms of the GNU General Public License as
  19    published by the Free Software Foundation, either version 3 of the License,
  20    or (at your option) any later version.
  21
  22    The Midnight Commander is distributed in the hope that it will be useful,
  23    but WITHOUT ANY WARRANTY; without even the implied warranty of
  24    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25    GNU General Public License for more details.
  26
  27    You should have received a copy of the GNU General Public License
  28    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  29  */
  30
  31 /** \file gauge.c
  32  *  \brief Source: WGauge widget (progress indicator)
  33  */
  34
  35 #include <config.h>
  36
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 #include "lib/global.h"
  41
  42 #include "lib/tty/tty.h"
  43 #include "lib/tty/color.h"
  44 #include "lib/skin.h"
  45 #include "lib/widget.h"
  46
  47 /*** global variables ****************************************************************************/
  48
  49 /*** file scope macro definitions ****************************************************************/
  50
  51 /*** file scope type declarations ****************************************************************/
  52
  53 /*** forward declarations (file scope functions) *************************************************/
  54
  55 /*** file scope variables ************************************************************************/
  56
  57 /* --------------------------------------------------------------------------------------------- */
  58 /*** file scope functions ************************************************************************/
  59 /* --------------------------------------------------------------------------------------------- */
  60
  61 static cb_ret_t
  62 gauge_callback (Widget *w, Widget *sender, widget_msg_t msg, int parm, void *data)
  63 {
  64     WGauge *g = GAUGE (w);
  65     const int *colors;
  66
  67     switch (msg)
  68     {
  69     case MSG_DRAW:
  70         colors = widget_get_colors (w);
  71         widget_gotoyx (w, 0, 0);
  72         if (!g->shown)
  73         {
  74             tty_setcolor (colors[DLG_COLOR_NORMAL]);
  75             tty_printf ("%*s", w->rect.cols, "");
  76         }
  77         else
  78         {
  79             int gauge_len;
  80             int percentage, columns;
  81             int total = g->max;
  82             int done = g->current;
  83
  84             if (total <= 0 || done < 0)
  85             {
  86                 done = 0;
  87                 total = 100;
  88             }
  89             if (done > total)
  90                 done = total;
  91             while (total > 65535)
  92             {
  93                 total /= 256;
  94                 done /= 256;
  95             }
  96
  97             gauge_len = w->rect.cols - 7;       /* 7 positions for percentage */
  98
  99             percentage = (200 * done / total + 1) / 2;
 100             columns = (2 * gauge_len * done / total + 1) / 2;
 101             tty_print_char ('[');
 102             if (g->from_left_to_right)
 103             {
 104                 tty_setcolor (GAUGE_COLOR);
 105                 tty_printf ("%*s", columns, "");
 106                 tty_setcolor (colors[DLG_COLOR_NORMAL]);
 107                 tty_printf ("%*s] %3d%%", gauge_len - columns, "", percentage);
 108             }
 109             else
 110             {
 111                 tty_setcolor (colors[DLG_COLOR_NORMAL]);
 112                 tty_printf ("%*s", gauge_len - columns, "");
 113                 tty_setcolor (GAUGE_COLOR);
 114                 tty_printf ("%*s", columns, "");
 115                 tty_setcolor (colors[DLG_COLOR_NORMAL]);
 116                 tty_printf ("] %3d%%", percentage);
 117             }
 118         }
 119         return MSG_HANDLED;
 120
 121     default:
 122         return widget_default_callback (w, sender, msg, parm, data);
 123     }
 124 }
 125
 126 /* --------------------------------------------------------------------------------------------- */
 127 /*** public functions ****************************************************************************/
 128 /* --------------------------------------------------------------------------------------------- */
 129
 130 WGauge *
 131 gauge_new (int y, int x, int cols, gboolean shown, int max, int current)
 132 {
 133     WRect r = { y, x, 1, cols };
 134     WGauge *g;
 135     Widget *w;
 136
 137     g = g_new (WGauge, 1);
 138     w = WIDGET (g);
 139     widget_init (w, &r, gauge_callback, NULL);
 140
 141     g->shown = shown;
 142     if (max == 0)
 143         max = 1;                /* I do not like division by zero :) */
 144     g->max = max;
 145     g->current = current;
 146     g->from_left_to_right = TRUE;
 147
 148     return g;
 149 }
 150
 151 /* --------------------------------------------------------------------------------------------- */
 152
 153 void
 154 gauge_set_value (WGauge *g, int max, int current)
 155 {
 156     if (g->current == current && g->max == max)
 157         return;                 /* Do not flicker */
 158
 159     if (max == 0)
 160         max = 1;                /* I do not like division by zero :) */
 161     g->current = current;
 162     g->max = max;
 163     widget_draw (WIDGET (g));
 164 }
 165
 166 /* --------------------------------------------------------------------------------------------- */
 167
 168 void
 169 gauge_show (WGauge *g, gboolean shown)
 170 {
 171     if (g->shown != shown)
 172     {
 173         g->shown = shown;
 174         widget_draw (WIDGET (g));
 175     }
 176 }
 177
 178 /* --------------------------------------------------------------------------------------------- */