lib/widget/gauge.c

   1 /*
   2    Widgets for the Midnight Commander
   3
   4    Copyright (C) 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003,
   5    2004, 2005, 2006, 2007, 2009, 2010, 2011
   6    The Free Software Foundation, Inc.
   7
   8    Authors:
   9    Radek Doulik, 1994, 1995
  10    Miguel de Icaza, 1994, 1995
  11    Jakub Jelinek, 1995
  12    Andrej Borsenkow, 1996
  13    Norbert Warmuth, 1997
  14    Andrew Borodin <aborodin@vmail.ru>, 2009, 2010
  15
  16    This file is part of the Midnight Commander.
  17
  18    The Midnight Commander is free software: you can redistribute it
  19    and/or modify it under the terms of the GNU General Public License as
  20    published by the Free Software Foundation, either version 3 of the License,
  21    or (at your option) any later version.
  22
  23    The Midnight Commander is distributed in the hope that it will be useful,
  24    but WITHOUT ANY WARRANTY; without even the implied warranty of
  25    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26    GNU General Public License for more details.
  27
  28    You should have received a copy of the GNU General Public License
  29    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  30  */
  31
  32 /** \file gauge.c
  33  *  \brief Source: WGauge widget (progress indicator)
  34  */
  35
  36 #include <config.h>
  37
  38 #include <stdlib.h>
  39 #include <string.h>
  40
  41 #include "lib/global.h"
  42
  43 #include "lib/tty/tty.h"
  44 #include "lib/tty/color.h"
  45 #include "lib/skin.h"
  46 #include "lib/widget.h"
  47
  48 /*** global variables ****************************************************************************/
  49
  50 /*** file scope macro definitions ****************************************************************/
  51
  52 /*** file scope type declarations ****************************************************************/
  53
  54 /*** file scope variables ************************************************************************/
  55
  56 /*** file scope functions ************************************************************************/
  57
  58 static cb_ret_t
  59 gauge_callback (Widget * w, Widget * sender, widget_msg_t msg, int parm, void *data)
  60 {
  61     WGauge *g = GAUGE (w);
  62     WDialog *h = w->owner;
  63
  64     switch (msg)
  65     {
  66     case MSG_INIT:
  67         return MSG_HANDLED;
  68
  69         /* We don't want to get the focus */
  70     case MSG_FOCUS:
  71         return MSG_NOT_HANDLED;
  72
  73     case MSG_DRAW:
  74         widget_move (w, 0, 0);
  75         if (!g->shown)
  76         {
  77             tty_setcolor (h->color[DLG_COLOR_NORMAL]);
  78             tty_printf ("%*s", w->cols, "");
  79         }
  80         else
  81         {
  82             int gauge_len;
  83             int percentage, columns;
  84             long total = g->max;
  85             long done = g->current;
  86
  87             if (total <= 0 || done < 0)
  88             {
  89                 done = 0;
  90                 total = 100;
  91             }
  92             if (done > total)
  93                 done = total;
  94             while (total > 65535)
  95             {
  96                 total /= 256;
  97                 done /= 256;
  98             }
  99
 100             gauge_len = w->cols - 7;    /* 7 positions for percentage */
 101
 102             percentage = (200 * done / total + 1) / 2;
 103             columns = (2 * gauge_len * done / total + 1) / 2;
 104             tty_print_char ('[');
 105             if (g->from_left_to_right)
 106             {
 107                 tty_setcolor (GAUGE_COLOR);
 108                 tty_printf ("%*s", (int) columns, "");
 109                 tty_setcolor (h->color[DLG_COLOR_NORMAL]);
 110                 tty_printf ("%*s] %3d%%", gauge_len - columns, "", percentage);
 111             }
 112             else
 113             {
 114                 tty_setcolor (h->color[DLG_COLOR_NORMAL]);
 115                 tty_printf ("%*s", gauge_len - columns, "");
 116                 tty_setcolor (GAUGE_COLOR);
 117                 tty_printf ("%*s", columns, "");
 118                 tty_setcolor (h->color[DLG_COLOR_NORMAL]);
 119                 tty_printf ("] %3d%%", 100 * columns / gauge_len, percentage);
 120             }
 121         }
 122         return MSG_HANDLED;
 123
 124     default:
 125         return widget_default_callback (w, sender, msg, parm, data);
 126     }
 127 }
 128
 129 /* --------------------------------------------------------------------------------------------- */
 130 /*** public functions ****************************************************************************/
 131 /* --------------------------------------------------------------------------------------------- */
 132
 133 WGauge *
 134 gauge_new (int y, int x, int cols, gboolean shown, int max, int current)
 135 {
 136     WGauge *g;
 137     Widget *w;
 138
 139     g = g_new (WGauge, 1);
 140     w = WIDGET (g);
 141     init_widget (w, y, x, 1, cols, gauge_callback, NULL);
 142     widget_want_cursor (w, FALSE);
 143     widget_want_hotkey (w, FALSE);
 144
 145     g->shown = shown;
 146     if (max == 0)
 147         max = 1;                /* I do not like division by zero :) */
 148     g->max = max;
 149     g->current = current;
 150     g->from_left_to_right = TRUE;
 151
 152     return g;
 153 }
 154
 155 /* --------------------------------------------------------------------------------------------- */
 156
 157 void
 158 gauge_set_value (WGauge * g, int max, int current)
 159 {
 160     if (g->current == current && g->max == max)
 161         return;                 /* Do not flicker */
 162
 163     if (max == 0)
 164         max = 1;                /* I do not like division by zero :) */
 165     g->current = current;
 166     g->max = max;
 167     gauge_callback (WIDGET (g), NULL, MSG_DRAW, 0, NULL);
 168 }
 169
 170 /* --------------------------------------------------------------------------------------------- */
 171
 172 void
 173 gauge_show (WGauge * g, gboolean shown)
 174 {
 175     if (g->shown != shown)
 176     {
 177         g->shown = shown;
 178         gauge_callback (WIDGET (g), NULL, MSG_DRAW, 0, NULL);
 179     }
 180 }
 181
 182 /* --------------------------------------------------------------------------------------------- */