Dogcows Code - chaz/tint2/blob - src/battery/battery.c

   1 /**************************************************************************
   2 *
   3 * Tint2 : battery
   4 *
   5 * Copyright (C) 2009 Sebastian Reichel <elektranox@gmail.com>
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License version 2
   9 * or any later version as published by the Free Software Foundation.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18 **************************************************************************/
  19
  20 #include <string.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <cairo.h>
  24 #include <cairo-xlib.h>
  25 #include <pango/pangocairo.h>
  26
  27 #include "window.h"
  28 #include "server.h"
  29 #include "taskbar.h"
  30 #include "panel.h"
  31 #include "area.h"
  32 #include "battery.h"
  33 #include "clock.h"
  34
  35 PangoFontDescription *bat1_font_desc;
  36 PangoFontDescription *bat2_font_desc;
  37 struct batstate battery_state;
  38
  39 static char buf_bat_percentage[10];
  40 static char buf_bat_time[20];
  41
  42 int8_t battery_low_status;
  43 char *battery_low_cmd;
  44 char *path_energy_now, *path_energy_full, *path_current_now, *path_status;
  45
  46
  47 void update_battery(struct batstate *data) {
  48         FILE *fp;
  49         char tmp[25];
  50         int64_t energy_now = 0, energy_full = 0, current_now = 0;
  51         int seconds = 0;
  52         int8_t new_percentage = 0;
  53
  54         fp = fopen(path_energy_now, "r");
  55         if(fp != NULL) {
  56                 fgets(tmp, sizeof tmp, fp);
  57                 energy_now = atoi(tmp);
  58                 fclose(fp);
  59         }
  60
  61         fp = fopen(path_energy_full, "r");
  62         if(fp != NULL) {
  63                 fgets(tmp, sizeof tmp, fp);
  64                 energy_full = atoi(tmp);
  65                 fclose(fp);
  66         }
  67
  68         fp = fopen(path_current_now, "r");
  69         if(fp != NULL) {
  70                 fgets(tmp, sizeof tmp, fp);
  71                 current_now = atoi(tmp);
  72                 fclose(fp);
  73         }
  74
  75         fp = fopen(path_status, "r");
  76         if(fp != NULL) {
  77                 fgets(tmp, sizeof tmp, fp);
  78                 fclose(fp);
  79         }
  80
  81         data->state = BATTERY_UNKNOWN;
  82         if(strcasecmp(tmp, "Charging\n")==0) data->state = BATTERY_CHARGING;
  83         if(strcasecmp(tmp, "Discharging\n")==0) data->state = BATTERY_DISCHARGING;
  84
  85         if(current_now > 0) {
  86                 switch(data->state) {
  87                         case BATTERY_CHARGING:
  88                                 seconds = 3600 * (energy_full - energy_now) / current_now;
  89                                 break;
  90                         case BATTERY_DISCHARGING:
  91                                 seconds = 3600 * energy_now / current_now;
  92                                 break;
  93                         default:
  94                                 seconds = 0;
  95                                 break;
  96                 }
  97         } else seconds = 0;
  98
  99         data->time.hours = seconds / 3600;
 100         seconds -= 3600 * data->time.hours;
 101         data->time.minutes = seconds / 60;
 102         seconds -= 60 * data->time.minutes;
 103         data->time.seconds = seconds;
 104
 105         if(energy_full > 0)
 106                 new_percentage = (energy_now*100)/energy_full;
 107
 108         if(battery_low_status != 0 && battery_low_status == new_percentage && data->percentage > new_percentage) {
 109                 printf("battery low, executing: %s\n", battery_low_cmd);
 110                 if(battery_low_cmd) system(battery_low_cmd);
 111         }
 112
 113         data->percentage = new_percentage;
 114 }
 115
 116
 117 void init_battery()
 118 {
 119         // check battery
 120         GDir *directory;
 121         GError *error = NULL;
 122         const char *entryname;
 123         char *battery_dir = 0;
 124
 125         path_energy_now = path_energy_full = path_current_now = path_status = 0;
 126         directory = g_dir_open("/sys/class/power_supply", 0, &error);
 127         if (error)
 128                 g_error_free(error);
 129         else {
 130                 while ((entryname=g_dir_read_name(directory))) {
 131                         if (strncmp(entryname,"AC", 2) == 0) continue;
 132
 133                         char *path1 = g_build_filename("/sys/class/power_supply", entryname, "present", NULL);
 134                         if (g_file_test (path1, G_FILE_TEST_EXISTS)) {
 135                                 g_free(path1);
 136                                 battery_dir = g_build_filename("/sys/class/power_supply", entryname, NULL);
 137                                 break;
 138                         }
 139                         g_free(path1);
 140                 }
 141         }
 142         if (battery_dir != 0) {
 143                 path_energy_now = g_build_filename(battery_dir, "energy_now", NULL);
 144                 path_energy_full = g_build_filename(battery_dir, "energy_full", NULL);
 145                 path_current_now = g_build_filename(battery_dir, "current_now", NULL);
 146                 path_status = g_build_filename(battery_dir, "status", NULL);
 147         }
 148
 149         FILE *fp;
 150    Panel *panel;
 151    Battery *battery;
 152    int i, bat_percentage_height, bat_percentage_height_ink, bat_time_height, bat_time_height_ink;
 153
 154         for (i=0 ; i < nb_panel ; i++) {
 155                 panel = &panel1[i];
 156                 battery = &panel->battery;
 157
 158                 battery->area.parent = panel;
 159                 battery->area.panel = panel;
 160                 battery->area._draw_foreground = draw_battery;
 161                 battery->area._resize = resize_battery;
 162
 163                 if (battery_dir == 0) panel->battery.area.on_screen = 0;
 164                 if (!battery->area.on_screen) continue;
 165                 if((fp = fopen(path_energy_now, "r")) == NULL) {
 166                         fprintf(stderr, "ERROR: battery applet can't open energy_now\n");
 167                         panel->battery.area.on_screen = 0;
 168                         continue;
 169                 }
 170                 fclose(fp);
 171                 if((fp = fopen(path_energy_full, "r")) == NULL) {
 172                         fprintf(stderr, "ERROR: battery applet can't open energy_full\n");
 173                         panel->battery.area.on_screen = 0;
 174                         continue;
 175                 }
 176                 fclose(fp);
 177                 if((fp = fopen(path_current_now, "r")) == NULL) {
 178                         fprintf(stderr, "ERROR: battery applet can't open current_now\n");
 179                         panel->battery.area.on_screen = 0;
 180                         continue;
 181                 }
 182                 fclose(fp);
 183                 if((fp = fopen(path_status, "r")) == NULL) {
 184                         fprintf(stderr, "ERROR: battery applet can't open status");
 185                         panel->battery.area.on_screen = 0;
 186                         continue;
 187                 }
 188                 fclose(fp);
 189
 190                 battery->area.posy = panel->area.pix.border.width + panel->area.paddingy;
 191                 battery->area.height = panel->area.height - (2 * battery->area.posy);
 192                 battery->area.resize = 1;
 193                 battery->area.redraw = 1;
 194
 195                 update_battery(&battery_state);
 196                 snprintf(buf_bat_percentage, sizeof(buf_bat_percentage), "%d%%", battery_state.percentage);
 197                 snprintf(buf_bat_time, sizeof(buf_bat_time), "%02d:%02d", battery_state.time.hours, battery_state.time.minutes);
 198
 199                 get_text_size(bat1_font_desc, &bat_percentage_height_ink, &bat_percentage_height, panel->area.height, buf_bat_percentage, strlen(buf_bat_percentage));
 200                 battery->bat1_posy = (battery->area.height - bat_percentage_height) / 2;
 201
 202                 get_text_size(bat2_font_desc, &bat_time_height_ink, &bat_time_height, panel->area.height, buf_bat_time, strlen(buf_bat_time));
 203
 204                 battery->bat1_posy -= ((bat_time_height_ink + 2) / 2);
 205                 battery->bat2_posy = battery->bat1_posy + bat_percentage_height + 2 - (bat_percentage_height - bat_percentage_height_ink)/2 - (bat_time_height - bat_time_height_ink)/2;
 206         }
 207 }
 208
 209
 210 void draw_battery (void *obj, cairo_t *c, int active)
 211 {
 212         Battery *battery = obj;
 213         PangoLayout *layout;
 214
 215         layout = pango_cairo_create_layout (c);
 216
 217         // draw layout
 218         pango_layout_set_font_description(layout, bat1_font_desc);
 219         pango_layout_set_width(layout, battery->area.width * PANGO_SCALE);
 220         pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER);
 221         pango_layout_set_text(layout, buf_bat_percentage, strlen(buf_bat_percentage));
 222
 223         cairo_set_source_rgba(c, battery->font.color[0], battery->font.color[1], battery->font.color[2], battery->font.alpha);
 224
 225         pango_cairo_update_layout(c, layout);
 226         cairo_move_to(c, 0, battery->bat1_posy);
 227         pango_cairo_show_layout(c, layout);
 228
 229         pango_layout_set_font_description(layout, bat2_font_desc);
 230         pango_layout_set_indent(layout, 0);
 231         pango_layout_set_text(layout, buf_bat_time, strlen(buf_bat_time));
 232         pango_layout_set_width(layout, battery->area.width * PANGO_SCALE);
 233
 234         pango_cairo_update_layout(c, layout);
 235         cairo_move_to(c, 0, battery->bat2_posy);
 236         pango_cairo_show_layout(c, layout);
 237
 238         g_object_unref(layout);
 239 }
 240
 241 void resize_battery(void *obj)
 242 {
 243         Battery *battery = obj;
 244         PangoLayout *layout;
 245         int percentage_width, time_width, new_width;
 246
 247         percentage_width = time_width = 0;
 248         battery->area.redraw = 1;
 249
 250         snprintf(buf_bat_percentage, sizeof(buf_bat_percentage), "%d%%", battery_state.percentage);
 251         snprintf(buf_bat_time, sizeof(buf_bat_time), "%02d:%02d", battery_state.time.hours, battery_state.time.minutes);
 252
 253         cairo_surface_t *cs;
 254         cairo_t *c;
 255         Pixmap pmap;
 256         pmap = XCreatePixmap(server.dsp, server.root_win, battery->area.width, battery->area.height, server.depth);
 257
 258         cs = cairo_xlib_surface_create(server.dsp, pmap, server.visual, battery->area.width, battery->area.height);
 259         c = cairo_create(cs);
 260         layout = pango_cairo_create_layout(c);
 261
 262         // check width
 263         pango_layout_set_font_description(layout, bat1_font_desc);
 264         pango_layout_set_indent(layout, 0);
 265         pango_layout_set_text(layout, buf_bat_percentage, strlen(buf_bat_percentage));
 266         pango_layout_get_pixel_size(layout, &percentage_width, NULL);
 267
 268         pango_layout_set_font_description(layout, bat2_font_desc);
 269         pango_layout_set_indent(layout, 0);
 270         pango_layout_set_text(layout, buf_bat_time, strlen(buf_bat_time));
 271         pango_layout_get_pixel_size(layout, &time_width, NULL);
 272
 273         if(percentage_width > time_width) new_width = percentage_width;
 274         else new_width = time_width;
 275
 276         new_width += (2*battery->area.paddingxlr) + (2*battery->area.pix.border.width);
 277
 278         if(new_width > battery->area.width || new_width < (battery->area.width-6)) {
 279                 int i;
 280                 Panel *panel = ((Area*)obj)->panel;
 281
 282                 printf("battery_width %d, new_width %d\n", battery->area.width, new_width);
 283
 284                 // resize battery
 285                 // we try to limit the number of resize
 286                 battery->area.width = new_width + 1;
 287                 battery->area.posx = panel->area.width - battery->area.width - panel->area.paddingxlr - panel->area.pix.border.width;
 288                 if (panel->clock.area.on_screen)
 289                         battery->area.posx -= (panel->clock.area.width + panel->area.paddingx);
 290
 291                 // resize other objects on panel
 292                 for (i=0 ; i < nb_panel ; i++)
 293                         panel1[i].area.resize = 1;
 294
 295                 systray.area.resize = 1;
 296                 panel_refresh = 1;
 297         }
 298
 299         g_object_unref (layout);
 300         cairo_destroy (c);
 301         cairo_surface_destroy (cs);
 302         XFreePixmap (server.dsp, pmap);
 303 }
 304