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 init_battery()
  48 {
  49         // check battery
  50         GDir *directory;
  51         GError *error = NULL;
  52         const char *entryname;
  53         char *battery_dir = 0;
  54
  55         path_energy_now = path_energy_full = path_current_now = path_status = 0;
  56         directory = g_dir_open("/sys/class/power_supply", 0, &error);
  57         if (error)
  58                 g_error_free(error);
  59         else {
  60                 while ((entryname=g_dir_read_name(directory))) {
  61                         if (strncmp(entryname,"AC", 2) == 0) continue;
  62
  63                         char *path1 = g_build_filename("/sys/class/power_supply", entryname, "present", NULL);
  64                         if (g_file_test (path1, G_FILE_TEST_EXISTS)) {
  65                                 g_free(path1);
  66                                 battery_dir = g_build_filename("/sys/class/power_supply", entryname, NULL);
  67                                 break;
  68                         }
  69                         g_free(path1);
  70                 }
  71         }
  72         if (battery_dir != 0) {
  73                 char *path1 = g_build_filename(battery_dir, "energy_now", NULL);
  74                 if (g_file_test (path1, G_FILE_TEST_EXISTS)) {
  75                         path_energy_now = g_build_filename(battery_dir, "energy_now", NULL);
  76                         path_energy_full = g_build_filename(battery_dir, "energy_full", NULL);
  77                 }
  78                 else {
  79                         char *path2 = g_build_filename(battery_dir, "charge_now", NULL);
  80                         if (g_file_test (path2, G_FILE_TEST_EXISTS)) {
  81                                 path_energy_now = g_build_filename(battery_dir, "charge_now", NULL);
  82                                 path_energy_full = g_build_filename(battery_dir, "charge_full", NULL);
  83                         }
  84                         else {
  85                                 g_free(battery_dir);
  86                                 battery_dir = 0;
  87                                 fprintf(stderr, "ERROR: can't found energy_* or charge_*\n");
  88                         }
  89                         g_free(path2);
  90                 }
  91                 path_current_now = g_build_filename(battery_dir, "current_now", NULL);
  92                 path_status = g_build_filename(battery_dir, "status", NULL);
  93                 g_free(path1);
  94         }
  95
  96         FILE *fp;
  97    Panel *panel;
  98    Battery *battery;
  99    int i, bat_percentage_height, bat_percentage_height_ink, bat_time_height, bat_time_height_ink;
 100
 101         for (i=0 ; i < nb_panel ; i++) {
 102                 panel = &panel1[i];
 103                 battery = &panel->battery;
 104
 105                 if (battery_dir == 0) battery->area.on_screen = 0;
 106                 if (!battery->area.on_screen) continue;
 107
 108                 battery->area.parent = panel;
 109                 battery->area.panel = panel;
 110                 battery->area._draw_foreground = draw_battery;
 111                 battery->area._resize = resize_battery;
 112
 113                 if((fp = fopen(path_energy_now, "r")) == NULL) {
 114                         fprintf(stderr, "ERROR: battery applet can't open energy_now\n");
 115                         panel->battery.area.on_screen = 0;
 116                         continue;
 117                 }
 118                 fclose(fp);
 119                 if((fp = fopen(path_energy_full, "r")) == NULL) {
 120                         fprintf(stderr, "ERROR: battery applet can't open energy_full\n");
 121                         panel->battery.area.on_screen = 0;
 122                         continue;
 123                 }
 124                 fclose(fp);
 125                 if((fp = fopen(path_current_now, "r")) == NULL) {
 126                         fprintf(stderr, "ERROR: battery applet can't open current_now\n");
 127                         panel->battery.area.on_screen = 0;
 128                         continue;
 129                 }
 130                 fclose(fp);
 131                 if((fp = fopen(path_status, "r")) == NULL) {
 132                         fprintf(stderr, "ERROR: battery applet can't open status");
 133                         panel->battery.area.on_screen = 0;
 134                         continue;
 135                 }
 136                 fclose(fp);
 137
 138                 battery->area.posy = panel->area.pix.border.width + panel->area.paddingy;
 139                 battery->area.height = panel->area.height - (2 * battery->area.posy);
 140                 battery->area.resize = 1;
 141                 battery->area.redraw = 1;
 142
 143                 update_battery(&battery_state);
 144                 snprintf(buf_bat_percentage, sizeof(buf_bat_percentage), "%d%%", battery_state.percentage);
 145                 snprintf(buf_bat_time, sizeof(buf_bat_time), "%02d:%02d", battery_state.time.hours, battery_state.time.minutes);
 146
 147                 get_text_size(bat1_font_desc, &bat_percentage_height_ink, &bat_percentage_height, panel->area.height, buf_bat_percentage, strlen(buf_bat_percentage));
 148                 battery->bat1_posy = (battery->area.height - bat_percentage_height) / 2;
 149
 150                 get_text_size(bat2_font_desc, &bat_time_height_ink, &bat_time_height, panel->area.height, buf_bat_time, strlen(buf_bat_time));
 151
 152                 battery->bat1_posy -= ((bat_time_height_ink + 2) / 2);
 153                 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;
 154         }
 155 }
 156
 157
 158 void update_battery() {
 159         FILE *fp;
 160         char tmp[25];
 161         int64_t energy_now = 0, energy_full = 0, current_now = 0;
 162         int seconds = 0;
 163         int8_t new_percentage = 0;
 164
 165         fp = fopen(path_energy_now, "r");
 166         if(fp != NULL) {
 167                 fgets(tmp, sizeof tmp, fp);
 168                 energy_now = atoi(tmp);
 169                 fclose(fp);
 170         }
 171
 172         fp = fopen(path_energy_full, "r");
 173         if(fp != NULL) {
 174                 fgets(tmp, sizeof tmp, fp);
 175                 energy_full = atoi(tmp);
 176                 fclose(fp);
 177         }
 178
 179         fp = fopen(path_current_now, "r");
 180         if(fp != NULL) {
 181                 fgets(tmp, sizeof tmp, fp);
 182                 current_now = atoi(tmp);
 183                 fclose(fp);
 184         }
 185
 186         fp = fopen(path_status, "r");
 187         if(fp != NULL) {
 188                 fgets(tmp, sizeof tmp, fp);
 189                 fclose(fp);
 190         }
 191
 192         battery_state.state = BATTERY_UNKNOWN;
 193         if(strcasecmp(tmp, "Charging\n")==0) battery_state.state = BATTERY_CHARGING;
 194         if(strcasecmp(tmp, "Discharging\n")==0) battery_state.state = BATTERY_DISCHARGING;
 195
 196         if(current_now > 0) {
 197                 switch(battery_state.state) {
 198                         case BATTERY_CHARGING:
 199                                 seconds = 3600 * (energy_full - energy_now) / current_now;
 200                                 break;
 201                         case BATTERY_DISCHARGING:
 202                                 seconds = 3600 * energy_now / current_now;
 203                                 break;
 204                         default:
 205                                 seconds = 0;
 206                                 break;
 207                 }
 208         } else seconds = 0;
 209
 210         battery_state.time.hours = seconds / 3600;
 211         seconds -= 3600 * battery_state.time.hours;
 212         battery_state.time.minutes = seconds / 60;
 213         seconds -= 60 * battery_state.time.minutes;
 214         battery_state.time.seconds = seconds;
 215
 216         if(energy_full > 0)
 217                 new_percentage = (energy_now*100)/energy_full;
 218
 219         if(battery_low_status != 0 && battery_low_status == new_percentage && battery_state.percentage > new_percentage) {
 220                 printf("battery low, executing: %s\n", battery_low_cmd);
 221                 if(battery_low_cmd) system(battery_low_cmd);
 222         }
 223
 224         battery_state.percentage = new_percentage;
 225 }
 226
 227
 228 void draw_battery (void *obj, cairo_t *c, int active)
 229 {
 230         Battery *battery = obj;
 231         PangoLayout *layout;
 232
 233         layout = pango_cairo_create_layout (c);
 234
 235         // draw layout
 236         pango_layout_set_font_description(layout, bat1_font_desc);
 237         pango_layout_set_width(layout, battery->area.width * PANGO_SCALE);
 238         pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER);
 239         pango_layout_set_text(layout, buf_bat_percentage, strlen(buf_bat_percentage));
 240
 241         cairo_set_source_rgba(c, battery->font.color[0], battery->font.color[1], battery->font.color[2], battery->font.alpha);
 242
 243         pango_cairo_update_layout(c, layout);
 244         cairo_move_to(c, 0, battery->bat1_posy);
 245         pango_cairo_show_layout(c, layout);
 246
 247         pango_layout_set_font_description(layout, bat2_font_desc);
 248         pango_layout_set_indent(layout, 0);
 249         pango_layout_set_text(layout, buf_bat_time, strlen(buf_bat_time));
 250         pango_layout_set_width(layout, battery->area.width * PANGO_SCALE);
 251
 252         pango_cairo_update_layout(c, layout);
 253         cairo_move_to(c, 0, battery->bat2_posy);
 254         pango_cairo_show_layout(c, layout);
 255
 256         g_object_unref(layout);
 257 }
 258
 259
 260 void resize_battery(void *obj)
 261 {
 262         Battery *battery = obj;
 263         PangoLayout *layout;
 264         int percentage_width, time_width, new_width;
 265
 266         percentage_width = time_width = 0;
 267         battery->area.redraw = 1;
 268
 269         snprintf(buf_bat_percentage, sizeof(buf_bat_percentage), "%d%%", battery_state.percentage);
 270         snprintf(buf_bat_time, sizeof(buf_bat_time), "%02d:%02d", battery_state.time.hours, battery_state.time.minutes);
 271
 272         cairo_surface_t *cs;
 273         cairo_t *c;
 274         Pixmap pmap;
 275         pmap = XCreatePixmap(server.dsp, server.root_win, battery->area.width, battery->area.height, server.depth);
 276
 277         cs = cairo_xlib_surface_create(server.dsp, pmap, server.visual, battery->area.width, battery->area.height);
 278         c = cairo_create(cs);
 279         layout = pango_cairo_create_layout(c);
 280
 281         // check width
 282         pango_layout_set_font_description(layout, bat1_font_desc);
 283         pango_layout_set_indent(layout, 0);
 284         pango_layout_set_text(layout, buf_bat_percentage, strlen(buf_bat_percentage));
 285         pango_layout_get_pixel_size(layout, &percentage_width, NULL);
 286
 287         pango_layout_set_font_description(layout, bat2_font_desc);
 288         pango_layout_set_indent(layout, 0);
 289         pango_layout_set_text(layout, buf_bat_time, strlen(buf_bat_time));
 290         pango_layout_get_pixel_size(layout, &time_width, NULL);
 291
 292         if(percentage_width > time_width) new_width = percentage_width;
 293         else new_width = time_width;
 294
 295         new_width += (2*battery->area.paddingxlr) + (2*battery->area.pix.border.width);
 296
 297         int old_width = battery->area.width;
 298
 299         Panel *panel = ((Area*)obj)->panel;
 300         battery->area.width = new_width + 1;
 301         battery->area.posx = panel->area.width - battery->area.width - panel->area.paddingxlr - panel->area.pix.border.width;
 302         if (panel->clock.area.on_screen)
 303                 battery->area.posx -= (panel->clock.area.width + panel->area.paddingx);
 304
 305         if(new_width > old_width || new_width < (old_width-6)) {
 306                 // refresh and resize other objects on panel
 307                 // we try to limit the number of refresh
 308                 // printf("battery_width %d, new_width %d\n", battery->area.width, new_width);
 309                 panel->area.resize = 1;
 310                 systray.area.resize = 1;
 311                 panel_refresh = 1;
 312         }
 313
 314         g_object_unref (layout);
 315         cairo_destroy (c);
 316         cairo_surface_destroy (cs);
 317         XFreePixmap (server.dsp, pmap);
 318 }
 319