lib/widget/gauge.c

   1 /*
   2    Widgets for the Midnight Commander
   3
   4    Copyright (C) 1994-2016
   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, 2010, 2013
  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 /*** file scope variables ************************************************************************/
  54
  55 /*** file scope functions ************************************************************************/
  56
  57 static cb_ret_t
  58 gauge_callback (Widget * w, Widget * sender, widget_msg_t msg, int parm, void *data)
  59 {
  60     WGauge *g = GAUGE (w);
  61     WDialog *h = w->owner;
  62
  63     switch (msg)
  64     {
  65     case MSG_INIT:
  66         return MSG_HANDLED;
  67
  68         /* We don't want to get the focus */
  69     case MSG_FOCUS:
  70         return MSG_NOT_HANDLED;
  71
  72     case MSG_DRAW:
  73         widget_move (w, 0, 0);
  74         if (!g->shown)
  75         {
  76             tty_setcolor (h->color[DLG_COLOR_NORMAL]);
  77             tty_printf ("%*s", w->cols, "");
  78         }
  79         else
  80         {
  81             int gauge_len;
  82             int percentage, columns;
  83             int total = g->max;
  84             int done = g->current;
  85
  86             if (total <= 0 || done < 0)
  87             {
  88                 done = 0;
  89                 total = 100;
  90             }
  91             if (done > total)
  92                 done = total;
  93             while (total > 65535)
  94             {
  95                 total /= 256;
  96                 done /= 256;
  97             }
  98
  99             gauge_len = w->cols - 7;    /* 7 positions for percentage */
 100
 101             percentage = (200 * done / total + 1) / 2;
 102             columns = (2 * gauge_len * done / total + 1) / 2;
 103             tty_print_char ('[');
 104             if (g->from_left_to_right)
 105             {
 106                 tty_setcolor (GAUGE_COLOR);
 107                 tty_printf ("%*s", columns, "");
 108                 tty_setcolor (h->color[DLG_COLOR_NORMAL]);
 109                 tty_printf ("%*s] %3d%%", gauge_len - columns, "", percentage);
 110             }
 111             else
 112             {
 113                 tty_setcolor (h->color[DLG_COLOR_NORMAL]);
 114                 tty_printf ("%*s", gauge_len - columns, "");
 115                 tty_setcolor (GAUGE_COLOR);
 116                 tty_printf ("%*s", columns, "");
 117                 tty_setcolor (h->color[DLG_COLOR_NORMAL]);
 118                 tty_printf ("] %3d%%", percentage);
 119             }
 120         }
 121         return MSG_HANDLED;
 122
 123     default:
 124         return widget_default_callback (w, sender, msg, parm, data);
 125     }
 126 }
 127
 128 /* --------------------------------------------------------------------------------------------- */
 129 /*** public functions ****************************************************************************/
 130 /* --------------------------------------------------------------------------------------------- */
 131
 132 WGauge *
 133 gauge_new (int y, int x, int cols, gboolean shown, int max, int current)
 134 {
 135     WGauge *g;
 136     Widget *w;
 137
 138     g = g_new (WGauge, 1);
 139     w = WIDGET (g);
 140     widget_init (w, y, x, 1, cols, gauge_callback, NULL);
 141
 142     g->shown = shown;
 143     if (max == 0)
 144         max = 1;                /* I do not like division by zero :) */
 145     g->max = max;
 146     g->current = current;
 147     g->from_left_to_right = TRUE;
 148
 149     return g;
 150 }
 151
 152 /* --------------------------------------------------------------------------------------------- */
 153
 154 void
 155 gauge_set_value (WGauge * g, int max, int current)
 156 {
 157     if (g->current == current && g->max == max)
 158         return;                 /* Do not flicker */
 159
 160     if (max == 0)
 161         max = 1;                /* I do not like division by zero :) */
 162     g->current = current;
 163     g->max = max;
 164     widget_redraw (WIDGET (g));
 165 }
 166
 167 /* --------------------------------------------------------------------------------------------- */
 168
 169 void
 170 gauge_show (WGauge * g, gboolean shown)
 171 {
 172     if (g->shown != shown)
 173     {
 174         g->shown = shown;
 175         widget_redraw (WIDGET (g));
 176     }
 177 }
 178
 179 /* --------------------------------------------------------------------------------------------- */