git.sur5r.net Git - i3/i3/blob - i3bar/src/xcb.c

   1 /*
   2  * vim:ts=4:sw=4:expandtab
   3  *
   4  * i3bar - an xcb-based status- and ws-bar for i3
   5  * © 2010 Axel Wagner and contributors (see also: LICENSE)
   6  *
   7  * xcb.c: Communicating with X
   8  *
   9  */
  10 #include <xcb/xcb.h>
  11 #include <xcb/xkb.h>
  12 #include <xcb/xproto.h>
  13 #include <xcb/xcb_aux.h>
  14
  15 #ifdef XCB_COMPAT
  16 #include "xcb_compat.h"
  17 #endif
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <fcntl.h>
  23 #include <string.h>
  24 #include <i3/ipc.h>
  25 #include <ev.h>
  26 #include <errno.h>
  27 #include <limits.h>
  28 #include <err.h>
  29
  30 #include <X11/Xlib.h>
  31 #include <X11/XKBlib.h>
  32 #include <X11/extensions/XKB.h>
  33 #include <cairo/cairo-xcb.h>
  34
  35 #include "common.h"
  36 #include "libi3.h"
  37
  38 /* We save the atoms in an easy to access array, indexed by an enum */
  39 enum {
  40 #define ATOM_DO(name) name,
  41 #include "xcb_atoms.def"
  42     NUM_ATOMS
  43 };
  44
  45 xcb_intern_atom_cookie_t atom_cookies[NUM_ATOMS];
  46 xcb_atom_t atoms[NUM_ATOMS];
  47
  48 /* Variables, that are the same for all functions at all times */
  49 xcb_connection_t *xcb_connection;
  50 int screen;
  51 xcb_screen_t *root_screen;
  52 xcb_window_t xcb_root;
  53
  54 /* selection window for tray support */
  55 static xcb_window_t selwin = XCB_NONE;
  56 static xcb_intern_atom_reply_t *tray_reply = NULL;
  57
  58 /* This is needed for integration with libi3 */
  59 xcb_connection_t *conn;
  60
  61 /* The font we'll use */
  62 static i3Font font;
  63
  64 /* Icon size (based on font size) */
  65 int icon_size;
  66
  67 xcb_visualtype_t *visual_type;
  68 uint8_t depth;
  69 xcb_colormap_t colormap;
  70
  71 /* Overall height of the bar (based on font size) */
  72 int bar_height;
  73
  74 /* These are only relevant for XKB, which we only need for grabbing modifiers */
  75 int xkb_base;
  76 int mod_pressed = 0;
  77
  78 /* Because the statusline is the same on all outputs, we have
  79  * global buffer to render it on */
  80 surface_t statusline_surface;
  81 uint32_t statusline_width;
  82
  83 /* Event watchers, to interact with the user */
  84 ev_prepare *xcb_prep;
  85 ev_check *xcb_chk;
  86 ev_io *xcb_io;
  87 ev_io *xkb_io;
  88
  89 /* The name of current binding mode */
  90 static mode binding;
  91
  92 /* Indicates whether a new binding mode was recently activated */
  93 bool activated_mode = false;
  94
  95 /* The parsed colors */
  96 struct xcb_colors_t {
  97     color_t bar_fg;
  98     color_t bar_bg;
  99     color_t sep_fg;
 100     color_t active_ws_fg;
 101     color_t active_ws_bg;
 102     color_t active_ws_border;
 103     color_t inactive_ws_fg;
 104     color_t inactive_ws_bg;
 105     color_t inactive_ws_border;
 106     color_t urgent_ws_bg;
 107     color_t urgent_ws_fg;
 108     color_t urgent_ws_border;
 109     color_t focus_ws_bg;
 110     color_t focus_ws_fg;
 111     color_t focus_ws_border;
 112     color_t binding_mode_bg;
 113     color_t binding_mode_fg;
 114     color_t binding_mode_border;
 115 };
 116 struct xcb_colors_t colors;
 117
 118 /* Horizontal offset between a workspace label and button borders */
 119 static const int ws_hoff_px = 4;
 120
 121 /* Vertical offset between a workspace label and button borders */
 122 static const int ws_voff_px = 3;
 123
 124 /* Offset between two workspace buttons */
 125 static const int ws_spacing_px = 1;
 126
 127 /* Offset between the statusline and 1) workspace buttons on the left
 128  *                                   2) the tray or screen edge on the right */
 129 static const int sb_hoff_px = 4;
 130
 131 /* Additional offset between the tray and the statusline, if the tray is not empty */
 132 static const int tray_loff_px = 2;
 133
 134 /* Vertical offset between the bar and a separator */
 135 static const int sep_voff_px = 4;
 136
 137 int _xcb_request_failed(xcb_void_cookie_t cookie, char *err_msg, int line) {
 138     xcb_generic_error_t *err;
 139     if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
 140         fprintf(stderr, "[%s:%d] ERROR: %s. X Error Code: %d\n", __FILE__, line, err_msg, err->error_code);
 141         return err->error_code;
 142     }
 143     return 0;
 144 }
 145
 146 uint32_t get_sep_offset(struct status_block *block) {
 147     if (!block->no_separator && block->sep_block_width > 0)
 148         return block->sep_block_width / 2 + block->sep_block_width % 2;
 149     return 0;
 150 }
 151
 152 int get_tray_width(struct tc_head *trayclients) {
 153     trayclient *trayclient;
 154     int tray_width = 0;
 155     TAILQ_FOREACH_REVERSE(trayclient, trayclients, tc_head, tailq) {
 156         if (!trayclient->mapped)
 157             continue;
 158         tray_width += icon_size + logical_px(config.tray_padding);
 159     }
 160     if (tray_width > 0)
 161         tray_width += logical_px(tray_loff_px);
 162     return tray_width;
 163 }
 164
 165 /*
 166  * Draws a separator for the given block if necessary.
 167  *
 168  */
 169 static void draw_separator(uint32_t x, struct status_block *block) {
 170     uint32_t sep_offset = get_sep_offset(block);
 171     if (TAILQ_NEXT(block, blocks) == NULL || sep_offset == 0)
 172         return;
 173
 174     uint32_t center_x = x - sep_offset;
 175     if (config.separator_symbol == NULL) {
 176         /* Draw a classic one pixel, vertical separator. */
 177         cairo_save(statusline_surface.cr);
 178         cairo_set_operator(statusline_surface.cr, CAIRO_OPERATOR_SOURCE);
 179         cairo_set_source_color(&statusline_surface, colors.sep_fg);
 180         cairo_rectangle(statusline_surface.cr, center_x, logical_px(sep_voff_px), logical_px(1), bar_height - 2 * logical_px(sep_voff_px));
 181         cairo_fill(statusline_surface.cr);
 182         cairo_restore(statusline_surface.cr);
 183     } else {
 184         /* Draw a custom separator. */
 185         uint32_t separator_x = MAX(x - block->sep_block_width, center_x - separator_symbol_width / 2);
 186         set_font_colors(statusline_surface.gc, colors.sep_fg.colorpixel, colors.bar_bg.colorpixel);
 187         draw_text(config.separator_symbol, statusline_surface.id, statusline_surface.gc, visual_type,
 188                   separator_x, logical_px(ws_voff_px), x - separator_x);
 189     }
 190 }
 191
 192 /*
 193  * Redraws the statusline to the buffer
 194  *
 195  */
 196 void refresh_statusline(bool use_short_text) {
 197     struct status_block *block;
 198
 199     uint32_t old_statusline_width = statusline_width;
 200     statusline_width = 0;
 201
 202     /* Predict the text width of all blocks (in pixels). */
 203     TAILQ_FOREACH(block, &statusline_head, blocks) {
 204         /* Try to use the shorter text if necessary and possible. */
 205         if (use_short_text && block->short_text != NULL) {
 206             I3STRING_FREE(block->full_text);
 207             block->full_text = i3string_copy(block->short_text);
 208         }
 209
 210         if (i3string_get_num_bytes(block->full_text) == 0)
 211             continue;
 212
 213         block->width = predict_text_width(block->full_text);
 214
 215         /* Compute offset and append for text aligment in min_width. */
 216         if (block->min_width <= block->width) {
 217             block->x_offset = 0;
 218             block->x_append = 0;
 219         } else {
 220             uint32_t padding_width = block->min_width - block->width;
 221             switch (block->align) {
 222                 case ALIGN_LEFT:
 223                     block->x_append = padding_width;
 224                     break;
 225                 case ALIGN_RIGHT:
 226                     block->x_offset = padding_width;
 227                     break;
 228                 case ALIGN_CENTER:
 229                     block->x_offset = padding_width / 2;
 230                     block->x_append = padding_width / 2 + padding_width % 2;
 231                     break;
 232             }
 233         }
 234
 235         /* If this is not the last block, add some pixels for a separator. */
 236         if (TAILQ_NEXT(block, blocks) != NULL)
 237             statusline_width += block->sep_block_width;
 238
 239         statusline_width += block->width + block->x_offset + block->x_append;
 240     }
 241
 242     /* If the statusline is bigger than our screen we need to make sure that
 243      * the pixmap provides enough space, so re-allocate if the width grew */
 244     if (statusline_width > root_screen->width_in_pixels &&
 245         statusline_width > old_statusline_width)
 246         realloc_sl_buffer();
 247
 248     /* Clear the statusline pixmap. */
 249     cairo_save(statusline_surface.cr);
 250     cairo_set_source_color(&statusline_surface, colors.bar_bg);
 251     cairo_set_operator(statusline_surface.cr, CAIRO_OPERATOR_SOURCE);
 252     cairo_paint(statusline_surface.cr);
 253     cairo_restore(statusline_surface.cr);
 254
 255     /* Draw the text of each block. */
 256     uint32_t x = 0;
 257     TAILQ_FOREACH(block, &statusline_head, blocks) {
 258         if (i3string_get_num_bytes(block->full_text) == 0)
 259             continue;
 260         color_t fg_color;
 261
 262         /* If this block is urgent, draw it with the defined color and border. */
 263         if (block->urgent) {
 264             fg_color = colors.urgent_ws_fg;
 265
 266             /* Draw the background */
 267             cairo_set_source_color(&statusline_surface, colors.urgent_ws_bg);
 268             cairo_rectangle(statusline_surface.cr, x - logical_px(2), logical_px(1), block->width + logical_px(4), bar_height - logical_px(2));
 269             cairo_fill(statusline_surface.cr);
 270         } else {
 271             fg_color = (block->color ? cairo_hex_to_color(block->color) : colors.bar_fg);
 272         }
 273
 274         set_font_colors(statusline_surface.gc, fg_color.colorpixel, colors.bar_bg.colorpixel);
 275         draw_text(block->full_text, statusline_surface.id, statusline_surface.gc, visual_type,
 276                   x + block->x_offset, logical_px(ws_voff_px), block->width);
 277         x += block->width + block->sep_block_width + block->x_offset + block->x_append;
 278
 279         /* If this is not the last block, draw a separator. */
 280         draw_separator(x, block);
 281     }
 282 }
 283
 284 /*
 285  * Hides all bars (unmaps them)
 286  *
 287  */
 288 void hide_bars(void) {
 289     if ((config.hide_on_modifier == M_DOCK) || (config.hidden_state == S_SHOW && config.hide_on_modifier == M_HIDE)) {
 290         return;
 291     }
 292
 293     i3_output *walk;
 294     SLIST_FOREACH(walk, outputs, slist) {
 295         if (!walk->active) {
 296             continue;
 297         }
 298         xcb_unmap_window(xcb_connection, walk->bar.id);
 299     }
 300     stop_child();
 301 }
 302
 303 /*
 304  * Unhides all bars (maps them)
 305  *
 306  */
 307 void unhide_bars(void) {
 308     if (config.hide_on_modifier != M_HIDE) {
 309         return;
 310     }
 311
 312     i3_output *walk;
 313     xcb_void_cookie_t cookie;
 314     uint32_t mask;
 315     uint32_t values[5];
 316
 317     cont_child();
 318
 319     SLIST_FOREACH(walk, outputs, slist) {
 320         if (walk->bar.id == XCB_NONE) {
 321             continue;
 322         }
 323         mask = XCB_CONFIG_WINDOW_X |
 324                XCB_CONFIG_WINDOW_Y |
 325                XCB_CONFIG_WINDOW_WIDTH |
 326                XCB_CONFIG_WINDOW_HEIGHT |
 327                XCB_CONFIG_WINDOW_STACK_MODE;
 328         values[0] = walk->rect.x;
 329         if (config.position == POS_TOP)
 330             values[1] = walk->rect.y;
 331         else
 332             values[1] = walk->rect.y + walk->rect.h - bar_height;
 333         values[2] = walk->rect.w;
 334         values[3] = bar_height;
 335         values[4] = XCB_STACK_MODE_ABOVE;
 336         DLOG("Reconfiguring window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 337         cookie = xcb_configure_window_checked(xcb_connection,
 338                                               walk->bar.id,
 339                                               mask,
 340                                               values);
 341
 342         if (xcb_request_failed(cookie, "Could not reconfigure window")) {
 343             exit(EXIT_FAILURE);
 344         }
 345         xcb_map_window(xcb_connection, walk->bar.id);
 346     }
 347 }
 348
 349 /*
 350  * Parse the colors into a format that we can use
 351  *
 352  */
 353 void init_colors(const struct xcb_color_strings_t *new_colors) {
 354 #define PARSE_COLOR(name, def)                                                       \
 355     do {                                                                             \
 356         colors.name = cairo_hex_to_color(new_colors->name ? new_colors->name : def); \
 357     } while (0)
 358     PARSE_COLOR(bar_fg, "#FFFFFF");
 359     PARSE_COLOR(bar_bg, "#000000");
 360     PARSE_COLOR(sep_fg, "#666666");
 361     PARSE_COLOR(active_ws_fg, "#FFFFFF");
 362     PARSE_COLOR(active_ws_bg, "#333333");
 363     PARSE_COLOR(active_ws_border, "#333333");
 364     PARSE_COLOR(inactive_ws_fg, "#888888");
 365     PARSE_COLOR(inactive_ws_bg, "#222222");
 366     PARSE_COLOR(inactive_ws_border, "#333333");
 367     PARSE_COLOR(urgent_ws_fg, "#FFFFFF");
 368     PARSE_COLOR(urgent_ws_bg, "#900000");
 369     PARSE_COLOR(urgent_ws_border, "#2f343a");
 370     PARSE_COLOR(focus_ws_fg, "#FFFFFF");
 371     PARSE_COLOR(focus_ws_bg, "#285577");
 372     PARSE_COLOR(focus_ws_border, "#4c7899");
 373 #undef PARSE_COLOR
 374
 375 #define PARSE_COLOR_FALLBACK(name, fallback)                                                     \
 376     do {                                                                                         \
 377         colors.name = new_colors->name ? cairo_hex_to_color(new_colors->name) : colors.fallback; \
 378     } while (0)
 379
 380     /* For the binding mode indicator colors, we don't hardcode a default.
 381      * Instead, we fall back to urgent_ws_* colors. */
 382     PARSE_COLOR_FALLBACK(binding_mode_fg, urgent_ws_fg);
 383     PARSE_COLOR_FALLBACK(binding_mode_bg, urgent_ws_bg);
 384     PARSE_COLOR_FALLBACK(binding_mode_border, urgent_ws_border);
 385 #undef PARSE_COLOR_FALLBACK
 386
 387     init_tray_colors();
 388     xcb_flush(xcb_connection);
 389 }
 390
 391 /*
 392  * Handle a button press event (i.e. a mouse click on one of our bars).
 393  * We determine, whether the click occured on a workspace button or if the scroll-
 394  * wheel was used and change the workspace appropriately
 395  *
 396  */
 397 void handle_button(xcb_button_press_event_t *event) {
 398     /* Determine, which bar was clicked */
 399     i3_output *walk;
 400     xcb_window_t bar = event->event;
 401     SLIST_FOREACH(walk, outputs, slist) {
 402         if (walk->bar.id == bar) {
 403             break;
 404         }
 405     }
 406
 407     if (walk == NULL) {
 408         DLOG("Unknown bar clicked!\n");
 409         return;
 410     }
 411
 412     int32_t x = event->event_x >= 0 ? event->event_x : 0;
 413     int32_t original_x = x;
 414
 415     DLOG("Got button %d\n", event->detail);
 416
 417     int workspace_width = 0;
 418     i3_ws *cur_ws = NULL, *clicked_ws = NULL, *ws_walk;
 419
 420     TAILQ_FOREACH(ws_walk, walk->workspaces, tailq) {
 421         int w = 2 * logical_px(ws_hoff_px) + 2 * logical_px(1) + ws_walk->name_width;
 422         if (x >= workspace_width && x <= workspace_width + w)
 423             clicked_ws = ws_walk;
 424         if (ws_walk->visible)
 425             cur_ws = ws_walk;
 426         workspace_width += w;
 427         if (TAILQ_NEXT(ws_walk, tailq) != NULL)
 428             workspace_width += logical_px(ws_spacing_px);
 429     }
 430
 431     if (x > workspace_width && child_want_click_events()) {
 432         /* If the child asked for click events,
 433          * check if a status block has been clicked. */
 434         int tray_width = get_tray_width(walk->trayclients);
 435         int block_x = 0, last_block_x;
 436         int offset = walk->rect.w - statusline_width - tray_width - logical_px(sb_hoff_px);
 437
 438         x = original_x - offset;
 439         if (x >= 0 && (size_t)x < statusline_width) {
 440             struct status_block *block;
 441             int sep_offset_remainder = 0;
 442
 443             TAILQ_FOREACH(block, &statusline_head, blocks) {
 444                 if (i3string_get_num_bytes(block->full_text) == 0)
 445                     continue;
 446
 447                 last_block_x = block_x;
 448                 block_x += block->width + block->x_offset + block->x_append + get_sep_offset(block) + sep_offset_remainder;
 449
 450                 if (x <= block_x && x >= last_block_x) {
 451                     send_block_clicked(event->detail, block->name, block->instance, event->root_x, event->root_y);
 452                     return;
 453                 }
 454
 455                 sep_offset_remainder = block->sep_block_width - get_sep_offset(block);
 456             }
 457         }
 458         x = original_x;
 459     }
 460
 461     /* If a custom command was specified for this mouse button, it overrides
 462      * the default behavior. */
 463     binding_t *binding;
 464     TAILQ_FOREACH(binding, &(config.bindings), bindings) {
 465         if (binding->input_code != event->detail)
 466             continue;
 467
 468         i3_send_msg(I3_IPC_MESSAGE_TYPE_COMMAND, binding->command);
 469         return;
 470     }
 471
 472     if (cur_ws == NULL) {
 473         DLOG("No workspace active?\n");
 474         return;
 475     }
 476     switch (event->detail) {
 477         case 4:
 478             /* Mouse wheel up. We select the previous ws, if any.
 479              * If there is no more workspace, don’t even send the workspace
 480              * command, otherwise (with workspace auto_back_and_forth) we’d end
 481              * up on the wrong workspace. */
 482             if (cur_ws == TAILQ_FIRST(walk->workspaces))
 483                 return;
 484
 485             cur_ws = TAILQ_PREV(cur_ws, ws_head, tailq);
 486             break;
 487         case 5:
 488             /* Mouse wheel down. We select the next ws, if any.
 489              * If there is no more workspace, don’t even send the workspace
 490              * command, otherwise (with workspace auto_back_and_forth) we’d end
 491              * up on the wrong workspace. */
 492             if (cur_ws == TAILQ_LAST(walk->workspaces, ws_head))
 493                 return;
 494
 495             cur_ws = TAILQ_NEXT(cur_ws, tailq);
 496             break;
 497         case 1:
 498             cur_ws = clicked_ws;
 499
 500             /* if no workspace was clicked, focus our currently visible
 501              * workspace if it is not already focused */
 502             if (cur_ws == NULL) {
 503                 TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 504                     if (cur_ws->visible && !cur_ws->focused)
 505                         break;
 506                 }
 507             }
 508
 509             /* if there is nothing to focus, we are done */
 510             if (cur_ws == NULL)
 511                 return;
 512
 513             break;
 514         default:
 515             return;
 516     }
 517
 518     /* To properly handle workspace names with double quotes in them, we need
 519      * to escape the double quotes. Unfortunately, that’s rather ugly in C: We
 520      * first count the number of double quotes, then we allocate a large enough
 521      * buffer, then we copy character by character. */
 522     int num_quotes = 0;
 523     size_t namelen = 0;
 524     const char *utf8_name = cur_ws->canonical_name;
 525     for (const char *walk = utf8_name; *walk != '\0'; walk++) {
 526         if (*walk == '"' || *walk == '\\')
 527             num_quotes++;
 528         /* While we’re looping through the name anyway, we can save one
 529          * strlen(). */
 530         namelen++;
 531     }
 532
 533     const size_t len = namelen + strlen("workspace \"\"") + 1;
 534     char *buffer = scalloc(len + num_quotes, 1);
 535     strncpy(buffer, "workspace \"", strlen("workspace \""));
 536     size_t inpos, outpos;
 537     for (inpos = 0, outpos = strlen("workspace \"");
 538          inpos < namelen;
 539          inpos++, outpos++) {
 540         if (utf8_name[inpos] == '"' || utf8_name[inpos] == '\\') {
 541             buffer[outpos] = '\\';
 542             outpos++;
 543         }
 544         buffer[outpos] = utf8_name[inpos];
 545     }
 546     buffer[outpos] = '"';
 547     i3_send_msg(I3_IPC_MESSAGE_TYPE_COMMAND, buffer);
 548     free(buffer);
 549 }
 550
 551 /*
 552  * Handle visibility notifications: when none of the bars are visible, e.g.
 553  * if windows are in fullscreen on each output, suspend the child process.
 554  *
 555  */
 556 static void handle_visibility_notify(xcb_visibility_notify_event_t *event) {
 557     bool visible = (event->state != XCB_VISIBILITY_FULLY_OBSCURED);
 558     int num_visible = 0;
 559     i3_output *output;
 560
 561     SLIST_FOREACH(output, outputs, slist) {
 562         if (!output->active) {
 563             continue;
 564         }
 565         if (output->bar.id == event->window) {
 566             if (output->visible == visible) {
 567                 return;
 568             }
 569             output->visible = visible;
 570         }
 571         num_visible += output->visible;
 572     }
 573
 574     if (num_visible == 0) {
 575         stop_child();
 576     } else if (num_visible == visible) {
 577         /* Wake the child only when transitioning from 0 to 1 visible bar.
 578          * We cannot transition from 0 to 2 or more visible bars at once since
 579          * visibility events are delivered to each window separately */
 580         cont_child();
 581     }
 582 }
 583
 584 /*
 585  * Adjusts the size of the tray window and alignment of the tray clients by
 586  * configuring their respective x coordinates. To be called when mapping or
 587  * unmapping a tray client window.
 588  *
 589  */
 590 static void configure_trayclients(void) {
 591     trayclient *trayclient;
 592     i3_output *output;
 593     SLIST_FOREACH(output, outputs, slist) {
 594         if (!output->active)
 595             continue;
 596
 597         int clients = 0;
 598         TAILQ_FOREACH_REVERSE(trayclient, output->trayclients, tc_head, tailq) {
 599             if (!trayclient->mapped)
 600                 continue;
 601             clients++;
 602
 603             DLOG("Configuring tray window %08x to x=%d\n",
 604                  trayclient->win, output->rect.w - (clients * (icon_size + logical_px(config.tray_padding))));
 605             uint32_t x = output->rect.w - (clients * (icon_size + logical_px(config.tray_padding)));
 606             xcb_configure_window(xcb_connection,
 607                                  trayclient->win,
 608                                  XCB_CONFIG_WINDOW_X,
 609                                  &x);
 610         }
 611     }
 612 }
 613
 614 /*
 615  * Handles ClientMessages (messages sent from another client directly to us).
 616  *
 617  * At the moment, only the tray window will receive client messages. All
 618  * supported client messages currently are _NET_SYSTEM_TRAY_OPCODE.
 619  *
 620  */
 621 static void handle_client_message(xcb_client_message_event_t *event) {
 622     if (event->type == atoms[_NET_SYSTEM_TRAY_OPCODE] &&
 623         event->format == 32) {
 624         DLOG("_NET_SYSTEM_TRAY_OPCODE received\n");
 625         /* event->data.data32[0] is the timestamp */
 626         uint32_t op = event->data.data32[1];
 627         uint32_t mask;
 628         uint32_t values[2];
 629         if (op == SYSTEM_TRAY_REQUEST_DOCK) {
 630             xcb_window_t client = event->data.data32[2];
 631
 632             /* Listen for PropertyNotify events to get the most recent value of
 633              * the XEMBED_MAPPED atom, also listen for UnmapNotify events */
 634             mask = XCB_CW_EVENT_MASK;
 635             values[0] = XCB_EVENT_MASK_PROPERTY_CHANGE |
 636                         XCB_EVENT_MASK_STRUCTURE_NOTIFY;
 637             xcb_change_window_attributes(xcb_connection,
 638                                          client,
 639                                          mask,
 640                                          values);
 641
 642             /* Request the _XEMBED_INFO property. The XEMBED specification
 643              * (which is referred by the tray specification) says this *has* to
 644              * be set, but VLC does not set it… */
 645             bool map_it = true;
 646             int xe_version = 1;
 647             xcb_get_property_cookie_t xembedc;
 648             xcb_generic_error_t *error;
 649             xembedc = xcb_get_property(xcb_connection,
 650                                        0,
 651                                        client,
 652                                        atoms[_XEMBED_INFO],
 653                                        XCB_GET_PROPERTY_TYPE_ANY,
 654                                        0,
 655                                        2 * 32);
 656
 657             xcb_get_property_reply_t *xembedr = xcb_get_property_reply(xcb_connection,
 658                                                                        xembedc,
 659                                                                        &error);
 660             if (error != NULL) {
 661                 ELOG("Error getting _XEMBED_INFO property: error_code %d\n",
 662                      error->error_code);
 663                 free(error);
 664                 return;
 665             }
 666             if (xembedr != NULL && xembedr->length != 0) {
 667                 DLOG("xembed format = %d, len = %d\n", xembedr->format, xembedr->length);
 668                 uint32_t *xembed = xcb_get_property_value(xembedr);
 669                 DLOG("xembed version = %d\n", xembed[0]);
 670                 DLOG("xembed flags = %d\n", xembed[1]);
 671                 map_it = ((xembed[1] & XEMBED_MAPPED) == XEMBED_MAPPED);
 672                 xe_version = xembed[0];
 673                 if (xe_version > 1)
 674                     xe_version = 1;
 675                 free(xembedr);
 676             } else {
 677                 ELOG("Window %08x violates the XEMBED protocol, _XEMBED_INFO not set\n", client);
 678             }
 679
 680             DLOG("X window %08x requested docking\n", client);
 681             i3_output *walk, *output = NULL;
 682             SLIST_FOREACH(walk, outputs, slist) {
 683                 if (!walk->active)
 684                     continue;
 685                 if (config.tray_output) {
 686                     if ((strcasecmp(walk->name, config.tray_output) != 0) &&
 687                         (!walk->primary || strcasecmp("primary", config.tray_output) != 0))
 688                         continue;
 689                 }
 690
 691                 DLOG("using output %s\n", walk->name);
 692                 output = walk;
 693                 break;
 694             }
 695             /* In case of tray_output == primary and there is no primary output
 696              * configured, we fall back to the first available output. */
 697             if (output == NULL &&
 698                 config.tray_output &&
 699                 strcasecmp("primary", config.tray_output) == 0) {
 700                 SLIST_FOREACH(walk, outputs, slist) {
 701                     if (!walk->active)
 702                         continue;
 703                     DLOG("Falling back to output %s because no primary output is configured\n", walk->name);
 704                     output = walk;
 705                     break;
 706                 }
 707             }
 708             if (output == NULL) {
 709                 ELOG("No output found\n");
 710                 return;
 711             }
 712
 713             xcb_void_cookie_t rcookie = xcb_reparent_window(xcb_connection,
 714                                                             client,
 715                                                             output->bar.id,
 716                                                             output->rect.w - icon_size - logical_px(config.tray_padding),
 717                                                             logical_px(config.tray_padding));
 718             if (xcb_request_failed(rcookie, "Could not reparent window. Maybe it is using an incorrect depth/visual?"))
 719                 return;
 720
 721             /* We reconfigure the window to use a reasonable size. The systray
 722              * specification explicitly says:
 723              *   Tray icons may be assigned any size by the system tray, and
 724              *   should do their best to cope with any size effectively
 725              */
 726             mask = XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
 727             values[0] = icon_size;
 728             values[1] = icon_size;
 729             xcb_configure_window(xcb_connection,
 730                                  client,
 731                                  mask,
 732                                  values);
 733
 734             /* send the XEMBED_EMBEDDED_NOTIFY message */
 735             void *event = scalloc(32, 1);
 736             xcb_client_message_event_t *ev = event;
 737             ev->response_type = XCB_CLIENT_MESSAGE;
 738             ev->window = client;
 739             ev->type = atoms[_XEMBED];
 740             ev->format = 32;
 741             ev->data.data32[0] = XCB_CURRENT_TIME;
 742             ev->data.data32[1] = atoms[XEMBED_EMBEDDED_NOTIFY];
 743             ev->data.data32[2] = output->bar.id;
 744             ev->data.data32[3] = xe_version;
 745             xcb_send_event(xcb_connection,
 746                            0,
 747                            client,
 748                            XCB_EVENT_MASK_NO_EVENT,
 749                            (char *)ev);
 750             free(event);
 751
 752             /* Put the client inside the save set. Upon termination (whether
 753              * killed or normal exit does not matter) of i3bar, these clients
 754              * will be correctly reparented to their most closest living
 755              * ancestor. Without this, tray icons might die when i3bar
 756              * exits/crashes. */
 757             xcb_change_save_set(xcb_connection, XCB_SET_MODE_INSERT, client);
 758
 759             trayclient *tc = smalloc(sizeof(trayclient));
 760             tc->win = client;
 761             tc->xe_version = xe_version;
 762             tc->mapped = false;
 763             TAILQ_INSERT_TAIL(output->trayclients, tc, tailq);
 764
 765             if (map_it) {
 766                 DLOG("Mapping dock client\n");
 767                 xcb_map_window(xcb_connection, client);
 768             } else {
 769                 DLOG("Not mapping dock client yet\n");
 770             }
 771             /* Trigger an update to copy the statusline text to the appropriate
 772              * position */
 773             configure_trayclients();
 774             draw_bars(false);
 775         }
 776     }
 777 }
 778
 779 /*
 780  * Handles DestroyNotify events by removing the tray client from the data
 781  * structure. According to the XEmbed protocol, this is one way for a tray
 782  * client to finish the protocol. After this event is received, there is no
 783  * further interaction with the tray client.
 784  *
 785  * See: http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
 786  *
 787  */
 788 static void handle_destroy_notify(xcb_destroy_notify_event_t *event) {
 789     DLOG("DestroyNotify for window = %08x, event = %08x\n", event->window, event->event);
 790
 791     i3_output *walk;
 792     SLIST_FOREACH(walk, outputs, slist) {
 793         if (!walk->active)
 794             continue;
 795         DLOG("checking output %s\n", walk->name);
 796         trayclient *trayclient;
 797         TAILQ_FOREACH(trayclient, walk->trayclients, tailq) {
 798             if (trayclient->win != event->window)
 799                 continue;
 800
 801             DLOG("Removing tray client with window ID %08x\n", event->window);
 802             TAILQ_REMOVE(walk->trayclients, trayclient, tailq);
 803
 804             /* Trigger an update, we now have more space for the statusline */
 805             configure_trayclients();
 806             draw_bars(false);
 807             return;
 808         }
 809     }
 810 }
 811
 812 /*
 813  * Handles MapNotify events. These events happen when a tray client shows its
 814  * window. We respond by realigning the tray clients.
 815  *
 816  */
 817 static void handle_map_notify(xcb_map_notify_event_t *event) {
 818     DLOG("MapNotify for window = %08x, event = %08x\n", event->window, event->event);
 819
 820     i3_output *walk;
 821     SLIST_FOREACH(walk, outputs, slist) {
 822         if (!walk->active)
 823             continue;
 824         DLOG("checking output %s\n", walk->name);
 825         trayclient *trayclient;
 826         TAILQ_FOREACH(trayclient, walk->trayclients, tailq) {
 827             if (trayclient->win != event->window)
 828                 continue;
 829
 830             DLOG("Tray client mapped (window ID %08x). Adjusting tray.\n", event->window);
 831             trayclient->mapped = true;
 832
 833             /* Trigger an update, we now have more space for the statusline */
 834             configure_trayclients();
 835             draw_bars(false);
 836             return;
 837         }
 838     }
 839 }
 840 /*
 841  * Handles UnmapNotify events. These events happen when a tray client hides its
 842  * window. We respond by realigning the tray clients.
 843  *
 844  */
 845 static void handle_unmap_notify(xcb_unmap_notify_event_t *event) {
 846     DLOG("UnmapNotify for window = %08x, event = %08x\n", event->window, event->event);
 847
 848     i3_output *walk;
 849     SLIST_FOREACH(walk, outputs, slist) {
 850         if (!walk->active)
 851             continue;
 852         DLOG("checking output %s\n", walk->name);
 853         trayclient *trayclient;
 854         TAILQ_FOREACH(trayclient, walk->trayclients, tailq) {
 855             if (trayclient->win != event->window)
 856                 continue;
 857
 858             DLOG("Tray client unmapped (window ID %08x). Adjusting tray.\n", event->window);
 859             trayclient->mapped = false;
 860
 861             /* Trigger an update, we now have more space for the statusline */
 862             configure_trayclients();
 863             draw_bars(false);
 864             return;
 865         }
 866     }
 867 }
 868
 869 /*
 870  * Handle PropertyNotify messages. Currently only the _XEMBED_INFO property is
 871  * handled, which tells us whether a dock client should be mapped or unmapped.
 872  *
 873  */
 874 static void handle_property_notify(xcb_property_notify_event_t *event) {
 875     DLOG("PropertyNotify\n");
 876     if (event->atom == atoms[_XEMBED_INFO] &&
 877         event->state == XCB_PROPERTY_NEW_VALUE) {
 878         DLOG("xembed_info updated\n");
 879         trayclient *trayclient = NULL, *walk;
 880         i3_output *o_walk;
 881         SLIST_FOREACH(o_walk, outputs, slist) {
 882             if (!o_walk->active)
 883                 continue;
 884
 885             TAILQ_FOREACH(walk, o_walk->trayclients, tailq) {
 886                 if (walk->win != event->window)
 887                     continue;
 888                 trayclient = walk;
 889                 break;
 890             }
 891
 892             if (trayclient)
 893                 break;
 894         }
 895         if (!trayclient) {
 896             ELOG("PropertyNotify received for unknown window %08x\n",
 897                  event->window);
 898             return;
 899         }
 900         xcb_get_property_cookie_t xembedc;
 901         xembedc = xcb_get_property_unchecked(xcb_connection,
 902                                              0,
 903                                              trayclient->win,
 904                                              atoms[_XEMBED_INFO],
 905                                              XCB_GET_PROPERTY_TYPE_ANY,
 906                                              0,
 907                                              2 * 32);
 908
 909         xcb_get_property_reply_t *xembedr = xcb_get_property_reply(xcb_connection,
 910                                                                    xembedc,
 911                                                                    NULL);
 912         if (xembedr == NULL || xembedr->length == 0) {
 913             DLOG("xembed_info unset\n");
 914             return;
 915         }
 916
 917         DLOG("xembed format = %d, len = %d\n", xembedr->format, xembedr->length);
 918         uint32_t *xembed = xcb_get_property_value(xembedr);
 919         DLOG("xembed version = %d\n", xembed[0]);
 920         DLOG("xembed flags = %d\n", xembed[1]);
 921         bool map_it = ((xembed[1] & XEMBED_MAPPED) == XEMBED_MAPPED);
 922         DLOG("map state now %d\n", map_it);
 923         if (trayclient->mapped && !map_it) {
 924             /* need to unmap the window */
 925             xcb_unmap_window(xcb_connection, trayclient->win);
 926         } else if (!trayclient->mapped && map_it) {
 927             /* need to map the window */
 928             xcb_map_window(xcb_connection, trayclient->win);
 929         }
 930         free(xembedr);
 931     }
 932 }
 933
 934 /*
 935  * Handle ConfigureRequests by denying them and sending the client a
 936  * ConfigureNotify with its actual size.
 937  *
 938  */
 939 static void handle_configure_request(xcb_configure_request_event_t *event) {
 940     DLOG("ConfigureRequest for window = %08x\n", event->window);
 941
 942     trayclient *trayclient;
 943     i3_output *output;
 944     SLIST_FOREACH(output, outputs, slist) {
 945         if (!output->active)
 946             continue;
 947
 948         int clients = 0;
 949         TAILQ_FOREACH_REVERSE(trayclient, output->trayclients, tc_head, tailq) {
 950             if (!trayclient->mapped)
 951                 continue;
 952             clients++;
 953
 954             if (trayclient->win != event->window)
 955                 continue;
 956
 957             xcb_rectangle_t rect;
 958             rect.x = output->rect.w - (clients * (icon_size + logical_px(config.tray_padding)));
 959             rect.y = logical_px(config.tray_padding);
 960             rect.width = icon_size;
 961             rect.height = icon_size;
 962
 963             DLOG("This is a tray window. x = %d\n", rect.x);
 964             fake_configure_notify(xcb_connection, rect, event->window, 0);
 965             return;
 966         }
 967     }
 968
 969     DLOG("WARNING: Could not find corresponding tray window.\n");
 970 }
 971
 972 /*
 973  * This function is called immediately before the main loop locks. We flush xcb
 974  * then (and only then)
 975  *
 976  */
 977 void xcb_prep_cb(struct ev_loop *loop, ev_prepare *watcher, int revents) {
 978     xcb_flush(xcb_connection);
 979 }
 980
 981 /*
 982  * This function is called immediately after the main loop locks, so when one
 983  * of the watchers registered an event.
 984  * We check whether an X-Event arrived and handle it.
 985  *
 986  */
 987 void xcb_chk_cb(struct ev_loop *loop, ev_check *watcher, int revents) {
 988     xcb_generic_event_t *event;
 989
 990     if (xcb_connection_has_error(xcb_connection)) {
 991         ELOG("X11 connection was closed unexpectedly - maybe your X server terminated / crashed?\n");
 992         exit(1);
 993     }
 994
 995     while ((event = xcb_poll_for_event(xcb_connection)) != NULL) {
 996         int type = (event->response_type & ~0x80);
 997
 998         if (type == xkb_base && xkb_base > -1) {
 999             DLOG("received an xkb event\n");
1000
1001             xcb_xkb_state_notify_event_t *state = (xcb_xkb_state_notify_event_t *)event;
1002             if (state->xkbType == XCB_XKB_STATE_NOTIFY) {
1003                 int modstate = state->mods & config.modifier;
1004
1005 #define DLOGMOD(modmask, status)                        \
1006     do {                                                \
1007         switch (modmask) {                              \
1008             case ShiftMask:                             \
1009                 DLOG("ShiftMask got " #status "!\n");   \
1010                 break;                                  \
1011             case ControlMask:                           \
1012                 DLOG("ControlMask got " #status "!\n"); \
1013                 break;                                  \
1014             case Mod1Mask:                              \
1015                 DLOG("Mod1Mask got " #status "!\n");    \
1016                 break;                                  \
1017             case Mod2Mask:                              \
1018                 DLOG("Mod2Mask got " #status "!\n");    \
1019                 break;                                  \
1020             case Mod3Mask:                              \
1021                 DLOG("Mod3Mask got " #status "!\n");    \
1022                 break;                                  \
1023             case Mod4Mask:                              \
1024                 DLOG("Mod4Mask got " #status "!\n");    \
1025                 break;                                  \
1026             case Mod5Mask:                              \
1027                 DLOG("Mod5Mask got " #status "!\n");    \
1028                 break;                                  \
1029         }                                               \
1030     } while (0)
1031
1032                 if (modstate != mod_pressed) {
1033                     if (modstate == 0) {
1034                         DLOGMOD(config.modifier, released);
1035                         if (!activated_mode)
1036                             hide_bars();
1037                     } else {
1038                         DLOGMOD(config.modifier, pressed);
1039                         activated_mode = false;
1040                         unhide_bars();
1041                     }
1042                     mod_pressed = modstate;
1043                 }
1044 #undef DLOGMOD
1045             }
1046
1047             free(event);
1048             continue;
1049         }
1050
1051         switch (type) {
1052             case XCB_VISIBILITY_NOTIFY:
1053                 /* Visibility change: a bar is [un]obscured by other window */
1054                 handle_visibility_notify((xcb_visibility_notify_event_t *)event);
1055                 break;
1056             case XCB_EXPOSE:
1057                 /* Expose-events happen, when the window needs to be redrawn */
1058                 redraw_bars();
1059                 break;
1060             case XCB_BUTTON_PRESS:
1061                 /* Button press events are mouse buttons clicked on one of our bars */
1062                 handle_button((xcb_button_press_event_t *)event);
1063                 break;
1064             case XCB_CLIENT_MESSAGE:
1065                 /* Client messages are used for client-to-client communication, for
1066                  * example system tray widgets talk to us directly via client messages. */
1067                 handle_client_message((xcb_client_message_event_t *)event);
1068                 break;
1069             case XCB_DESTROY_NOTIFY:
1070                 /* DestroyNotify signifies the end of the XEmbed protocol */
1071                 handle_destroy_notify((xcb_destroy_notify_event_t *)event);
1072                 break;
1073             case XCB_UNMAP_NOTIFY:
1074                 /* UnmapNotify is received when a tray client hides its window. */
1075                 handle_unmap_notify((xcb_unmap_notify_event_t *)event);
1076                 break;
1077             case XCB_MAP_NOTIFY:
1078                 handle_map_notify((xcb_map_notify_event_t *)event);
1079                 break;
1080             case XCB_PROPERTY_NOTIFY:
1081                 /* PropertyNotify */
1082                 handle_property_notify((xcb_property_notify_event_t *)event);
1083                 break;
1084             case XCB_CONFIGURE_REQUEST:
1085                 /* ConfigureRequest, sent by a tray child */
1086                 handle_configure_request((xcb_configure_request_event_t *)event);
1087                 break;
1088         }
1089         free(event);
1090     }
1091 }
1092
1093 /*
1094  * Dummy callback. We only need this, so that the prepare and check watchers
1095  * are triggered
1096  *
1097  */
1098 void xcb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
1099 }
1100
1101 /*
1102  * Early initialization of the connection to X11: Everything which does not
1103  * depend on 'config'.
1104  *
1105  */
1106 char *init_xcb_early() {
1107     /* FIXME: xcb_connect leaks memory */
1108     xcb_connection = xcb_connect(NULL, &screen);
1109     if (xcb_connection_has_error(xcb_connection)) {
1110         ELOG("Cannot open display\n");
1111         exit(EXIT_FAILURE);
1112     }
1113     conn = xcb_connection;
1114     DLOG("Connected to xcb\n");
1115
1116 /* We have to request the atoms we need */
1117 #define ATOM_DO(name) atom_cookies[name] = xcb_intern_atom(xcb_connection, 0, strlen(#name), #name);
1118 #include "xcb_atoms.def"
1119
1120     root_screen = xcb_aux_get_screen(xcb_connection, screen);
1121     xcb_root = root_screen->root;
1122
1123     depth = root_screen->root_depth;
1124     colormap = root_screen->default_colormap;
1125     visual_type = xcb_aux_find_visual_by_attrs(root_screen, -1, 32);
1126     if (visual_type) {
1127         depth = xcb_aux_get_depth_of_visual(root_screen, visual_type->visual_id);
1128         colormap = xcb_generate_id(xcb_connection);
1129         xcb_void_cookie_t cm_cookie = xcb_create_colormap_checked(xcb_connection,
1130                                                                   XCB_COLORMAP_ALLOC_NONE,
1131                                                                   colormap,
1132                                                                   xcb_root,
1133                                                                   visual_type->visual_id);
1134         if (xcb_request_failed(cm_cookie, "Could not allocate colormap")) {
1135             exit(EXIT_FAILURE);
1136         }
1137     } else {
1138         visual_type = get_visualtype(root_screen);
1139     }
1140
1141     /* We draw the statusline to a seperate pixmap, because it looks the same on all bars and
1142      * this way, we can choose to crop it */
1143     xcb_pixmap_t statusline_id = xcb_generate_id(xcb_connection);
1144     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1145                                                                depth,
1146                                                                statusline_id,
1147                                                                xcb_root,
1148                                                                root_screen->width_in_pixels,
1149                                                                root_screen->height_in_pixels);
1150     cairo_surface_init(&statusline_surface, statusline_id, root_screen->width_in_pixels, root_screen->height_in_pixels);
1151
1152     /* The various watchers to communicate with xcb */
1153     xcb_io = smalloc(sizeof(ev_io));
1154     xcb_prep = smalloc(sizeof(ev_prepare));
1155     xcb_chk = smalloc(sizeof(ev_check));
1156
1157     ev_io_init(xcb_io, &xcb_io_cb, xcb_get_file_descriptor(xcb_connection), EV_READ);
1158     ev_prepare_init(xcb_prep, &xcb_prep_cb);
1159     ev_check_init(xcb_chk, &xcb_chk_cb);
1160
1161     ev_io_start(main_loop, xcb_io);
1162     ev_prepare_start(main_loop, xcb_prep);
1163     ev_check_start(main_loop, xcb_chk);
1164
1165     /* Now we get the atoms and save them in a nice data structure */
1166     get_atoms();
1167
1168     char *path = root_atom_contents("I3_SOCKET_PATH", xcb_connection, screen);
1169
1170     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline buffer"))
1171         exit(EXIT_FAILURE);
1172
1173     return path;
1174 }
1175
1176 /*
1177  * Register for xkb keyevents. To grab modifiers without blocking other applications from receiving key events
1178  * involving that modifier, we sadly have to use xkb which is not yet fully supported
1179  * in xcb.
1180  *
1181  */
1182 void register_xkb_keyevents() {
1183     const xcb_query_extension_reply_t *extreply;
1184     extreply = xcb_get_extension_data(conn, &xcb_xkb_id);
1185     if (!extreply->present) {
1186         ELOG("xkb is not present on this server\n");
1187         exit(EXIT_FAILURE);
1188     }
1189     DLOG("initializing xcb-xkb\n");
1190     xcb_xkb_use_extension(conn, XCB_XKB_MAJOR_VERSION, XCB_XKB_MINOR_VERSION);
1191     xcb_xkb_select_events(conn,
1192                           XCB_XKB_ID_USE_CORE_KBD,
1193                           XCB_XKB_EVENT_TYPE_STATE_NOTIFY,
1194                           0,
1195                           XCB_XKB_EVENT_TYPE_STATE_NOTIFY,
1196                           0xff,
1197                           0xff,
1198                           NULL);
1199     xkb_base = extreply->first_event;
1200 }
1201
1202 /*
1203  * Deregister from xkb keyevents.
1204  *
1205  */
1206 void deregister_xkb_keyevents() {
1207     xcb_xkb_select_events(conn,
1208                           XCB_XKB_ID_USE_CORE_KBD,
1209                           0,
1210                           0,
1211                           0,
1212                           0xff,
1213                           0xff,
1214                           NULL);
1215 }
1216
1217 /*
1218  * Initialization which depends on 'config' being usable. Called after the
1219  * configuration has arrived.
1220  *
1221  */
1222 void init_xcb_late(char *fontname) {
1223     if (fontname == NULL)
1224         fontname = "-misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1";
1225
1226     /* Load the font */
1227     font = load_font(fontname, true);
1228     set_font(&font);
1229     DLOG("Calculated font height: %d\n", font.height);
1230     bar_height = font.height + 2 * logical_px(ws_voff_px);
1231     icon_size = bar_height - 2 * logical_px(config.tray_padding);
1232
1233     if (config.separator_symbol)
1234         separator_symbol_width = predict_text_width(config.separator_symbol);
1235
1236     xcb_flush(xcb_connection);
1237
1238     if (config.hide_on_modifier == M_HIDE)
1239         register_xkb_keyevents();
1240 }
1241
1242 /*
1243  * Inform clients waiting for a new _NET_SYSTEM_TRAY that we took the
1244  * selection.
1245  *
1246  */
1247 static void send_tray_clientmessage(void) {
1248     uint8_t buffer[32] = {0};
1249     xcb_client_message_event_t *ev = (xcb_client_message_event_t *)buffer;
1250
1251     ev->response_type = XCB_CLIENT_MESSAGE;
1252     ev->window = xcb_root;
1253     ev->type = atoms[MANAGER];
1254     ev->format = 32;
1255     ev->data.data32[0] = XCB_CURRENT_TIME;
1256     ev->data.data32[1] = tray_reply->atom;
1257     ev->data.data32[2] = selwin;
1258
1259     xcb_send_event(xcb_connection,
1260                    0,
1261                    xcb_root,
1262                    0xFFFFFF,
1263                    (char *)buffer);
1264 }
1265
1266 /*
1267  * Initializes tray support by requesting the appropriate _NET_SYSTEM_TRAY atom
1268  * for the X11 display we are running on, then acquiring the selection for this
1269  * atom. Afterwards, tray clients will send ClientMessages to our window.
1270  *
1271  */
1272 void init_tray(void) {
1273     DLOG("Initializing system tray functionality\n");
1274     /* request the tray manager atom for the X11 display we are running on */
1275     char atomname[strlen("_NET_SYSTEM_TRAY_S") + 11];
1276     snprintf(atomname, strlen("_NET_SYSTEM_TRAY_S") + 11, "_NET_SYSTEM_TRAY_S%d", screen);
1277     xcb_intern_atom_cookie_t tray_cookie;
1278     if (tray_reply == NULL)
1279         tray_cookie = xcb_intern_atom(xcb_connection, 0, strlen(atomname), atomname);
1280
1281     /* tray support: we need a window to own the selection */
1282     selwin = xcb_generate_id(xcb_connection);
1283     uint32_t selmask = XCB_CW_BACK_PIXEL | XCB_CW_BORDER_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_COLORMAP;
1284     uint32_t selval[] = {root_screen->black_pixel, root_screen->black_pixel, 1, colormap};
1285     xcb_create_window(xcb_connection,
1286                       depth,
1287                       selwin,
1288                       xcb_root,
1289                       -1, -1,
1290                       1, 1,
1291                       0,
1292                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
1293                       visual_type->visual_id,
1294                       selmask,
1295                       selval);
1296
1297     uint32_t orientation = _NET_SYSTEM_TRAY_ORIENTATION_HORZ;
1298     /* set the atoms */
1299     xcb_change_property(xcb_connection,
1300                         XCB_PROP_MODE_REPLACE,
1301                         selwin,
1302                         atoms[_NET_SYSTEM_TRAY_ORIENTATION],
1303                         XCB_ATOM_CARDINAL,
1304                         32,
1305                         1,
1306                         &orientation);
1307     xcb_change_property(xcb_connection,
1308                         XCB_PROP_MODE_REPLACE,
1309                         selwin,
1310                         atoms[_NET_SYSTEM_TRAY_VISUAL],
1311                         XCB_ATOM_VISUALID,
1312                         32,
1313                         1,
1314                         &visual_type->visual_id);
1315
1316     init_tray_colors();
1317
1318     if (tray_reply == NULL) {
1319         if (!(tray_reply = xcb_intern_atom_reply(xcb_connection, tray_cookie, NULL))) {
1320             ELOG("Could not get atom %s\n", atomname);
1321             exit(EXIT_FAILURE);
1322         }
1323     }
1324
1325     xcb_set_selection_owner(xcb_connection,
1326                             selwin,
1327                             tray_reply->atom,
1328                             XCB_CURRENT_TIME);
1329
1330     /* Verify that we have the selection */
1331     xcb_get_selection_owner_cookie_t selcookie;
1332     xcb_get_selection_owner_reply_t *selreply;
1333
1334     selcookie = xcb_get_selection_owner(xcb_connection, tray_reply->atom);
1335     if (!(selreply = xcb_get_selection_owner_reply(xcb_connection, selcookie, NULL))) {
1336         ELOG("Could not get selection owner for %s\n", atomname);
1337         exit(EXIT_FAILURE);
1338     }
1339
1340     if (selreply->owner != selwin) {
1341         ELOG("Could not set the %s selection. "
1342              "Maybe another tray is already running?\n",
1343              atomname);
1344         /* NOTE that this error is not fatal. We just can’t provide tray
1345          * functionality */
1346         free(selreply);
1347         return;
1348     }
1349
1350     send_tray_clientmessage();
1351 }
1352
1353 /*
1354  * We need to set the _NET_SYSTEM_TRAY_COLORS atom on the tray selection window
1355  * to make GTK+ 3 applets with symbolic icons visible. If the colors are unset,
1356  * they assume a light background.
1357  * See also https://bugzilla.gnome.org/show_bug.cgi?id=679591
1358  *
1359  */
1360 void init_tray_colors(void) {
1361     /* Convert colors.bar_fg (#rrggbb) to 16-bit RGB */
1362     const char *bar_fg = (config.colors.bar_fg ? config.colors.bar_fg : "#FFFFFF");
1363
1364     DLOG("Setting bar_fg = %s as _NET_SYSTEM_TRAY_COLORS\n", bar_fg);
1365
1366     char strgroups[3][3] = {{bar_fg[1], bar_fg[2], '\0'},
1367                             {bar_fg[3], bar_fg[4], '\0'},
1368                             {bar_fg[5], bar_fg[6], '\0'}};
1369     const uint8_t r = strtol(strgroups[0], NULL, 16);
1370     const uint8_t g = strtol(strgroups[1], NULL, 16);
1371     const uint8_t b = strtol(strgroups[2], NULL, 16);
1372
1373     const uint16_t r16 = ((uint16_t)r << 8) | r;
1374     const uint16_t g16 = ((uint16_t)g << 8) | g;
1375     const uint16_t b16 = ((uint16_t)b << 8) | b;
1376
1377     const uint32_t tray_colors[12] = {
1378         r16, g16, b16, /* foreground color */
1379         r16, g16, b16, /* error color */
1380         r16, g16, b16, /* warning color */
1381         r16, g16, b16, /* success color */
1382     };
1383
1384     xcb_change_property(xcb_connection,
1385                         XCB_PROP_MODE_REPLACE,
1386                         selwin,
1387                         atoms[_NET_SYSTEM_TRAY_COLORS],
1388                         XCB_ATOM_CARDINAL,
1389                         32,
1390                         12,
1391                         tray_colors);
1392 }
1393
1394 /*
1395  * Cleanup the xcb stuff.
1396  * Called once, before the program terminates.
1397  *
1398  */
1399 void clean_xcb(void) {
1400     i3_output *o_walk;
1401     free_workspaces();
1402     SLIST_FOREACH(o_walk, outputs, slist) {
1403         destroy_window(o_walk);
1404         FREE(o_walk->trayclients);
1405         FREE(o_walk->workspaces);
1406         FREE(o_walk->name);
1407     }
1408     FREE_SLIST(outputs, i3_output);
1409     FREE(outputs);
1410
1411     xcb_flush(xcb_connection);
1412     xcb_aux_sync(xcb_connection);
1413     xcb_disconnect(xcb_connection);
1414
1415     ev_check_stop(main_loop, xcb_chk);
1416     ev_prepare_stop(main_loop, xcb_prep);
1417     ev_io_stop(main_loop, xcb_io);
1418
1419     FREE(xcb_chk);
1420     FREE(xcb_prep);
1421     FREE(xcb_io);
1422 }
1423
1424 /*
1425  * Get the earlier requested atoms and save them in the prepared data structure
1426  *
1427  */
1428 void get_atoms(void) {
1429     xcb_intern_atom_reply_t *reply;
1430 #define ATOM_DO(name)                                                        \
1431     reply = xcb_intern_atom_reply(xcb_connection, atom_cookies[name], NULL); \
1432     if (reply == NULL) {                                                     \
1433         ELOG("Could not get atom %s\n", #name);                              \
1434         exit(EXIT_FAILURE);                                                  \
1435     }                                                                        \
1436     atoms[name] = reply->atom;                                               \
1437     free(reply);
1438
1439 #include "xcb_atoms.def"
1440     DLOG("Got atoms\n");
1441 }
1442
1443 /*
1444  * Reparents all tray clients of the specified output to the root window. This
1445  * is either used when shutting down, when an output appears (xrandr --output
1446  * VGA1 --off) or when the primary output changes.
1447  *
1448  * Applications using the tray will start the protocol from the beginning again
1449  * afterwards.
1450  *
1451  */
1452 void kick_tray_clients(i3_output *output) {
1453     if (TAILQ_EMPTY(output->trayclients))
1454         return;
1455
1456     trayclient *trayclient;
1457     while (!TAILQ_EMPTY(output->trayclients)) {
1458         trayclient = TAILQ_FIRST(output->trayclients);
1459         /* Unmap, then reparent (to root) the tray client windows */
1460         xcb_unmap_window(xcb_connection, trayclient->win);
1461         xcb_reparent_window(xcb_connection,
1462                             trayclient->win,
1463                             xcb_root,
1464                             0,
1465                             0);
1466
1467         /* We remove the trayclient right here. We might receive an UnmapNotify
1468          * event afterwards, but better safe than sorry. */
1469         TAILQ_REMOVE(output->trayclients, trayclient, tailq);
1470     }
1471
1472     /* Fake a DestroyNotify so that Qt re-adds tray icons.
1473      * We cannot actually destroy the window because then Qt will not restore
1474      * its event mask on the new window. */
1475     uint8_t buffer[32] = {0};
1476     xcb_destroy_notify_event_t *event = (xcb_destroy_notify_event_t *)buffer;
1477
1478     event->response_type = XCB_DESTROY_NOTIFY;
1479     event->event = selwin;
1480     event->window = selwin;
1481
1482     xcb_send_event(conn, false, selwin, XCB_EVENT_MASK_STRUCTURE_NOTIFY, (char *)event);
1483
1484     send_tray_clientmessage();
1485 }
1486
1487 /*
1488  * Destroy the bar of the specified output
1489  *
1490  */
1491 void destroy_window(i3_output *output) {
1492     if (output == NULL) {
1493         return;
1494     }
1495     if (output->bar.id == XCB_NONE) {
1496         return;
1497     }
1498
1499     kick_tray_clients(output);
1500     xcb_destroy_window(xcb_connection, output->bar.id);
1501     output->bar.id = XCB_NONE;
1502 }
1503
1504 /*
1505  * Reallocate the statusline buffer
1506  *
1507  */
1508 void realloc_sl_buffer(void) {
1509     DLOG("Re-allocating statusline buffer, statusline_width = %d, root_screen->width_in_pixels = %d\n",
1510          statusline_width, root_screen->width_in_pixels);
1511     xcb_free_pixmap(xcb_connection, statusline_surface.id);
1512     cairo_surface_free(&statusline_surface);
1513
1514     xcb_pixmap_t statusline_id = xcb_generate_id(xcb_connection);
1515     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1516                                                                depth,
1517                                                                statusline_id,
1518                                                                xcb_root,
1519                                                                MAX(root_screen->width_in_pixels, statusline_width),
1520                                                                bar_height);
1521     cairo_surface_init(&statusline_surface, statusline_id, root_screen->width_in_pixels, root_screen->height_in_pixels);
1522
1523     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline buffer"))
1524         exit(EXIT_FAILURE);
1525 }
1526
1527 /* Strut partial tells i3 where to reserve space for i3bar. This is determined
1528  * by the `position` bar config directive. */
1529 xcb_void_cookie_t config_strut_partial(i3_output *output) {
1530     /* A local struct to save the strut_partial property */
1531     struct {
1532         uint32_t left;
1533         uint32_t right;
1534         uint32_t top;
1535         uint32_t bottom;
1536         uint32_t left_start_y;
1537         uint32_t left_end_y;
1538         uint32_t right_start_y;
1539         uint32_t right_end_y;
1540         uint32_t top_start_x;
1541         uint32_t top_end_x;
1542         uint32_t bottom_start_x;
1543         uint32_t bottom_end_x;
1544     } __attribute__((__packed__)) strut_partial;
1545     memset(&strut_partial, 0, sizeof(strut_partial));
1546
1547     switch (config.position) {
1548         case POS_NONE:
1549             break;
1550         case POS_TOP:
1551             strut_partial.top = bar_height;
1552             strut_partial.top_start_x = output->rect.x;
1553             strut_partial.top_end_x = output->rect.x + output->rect.w;
1554             break;
1555         case POS_BOT:
1556             strut_partial.bottom = bar_height;
1557             strut_partial.bottom_start_x = output->rect.x;
1558             strut_partial.bottom_end_x = output->rect.x + output->rect.w;
1559             break;
1560     }
1561     return xcb_change_property(xcb_connection,
1562                                XCB_PROP_MODE_REPLACE,
1563                                output->bar.id,
1564                                atoms[_NET_WM_STRUT_PARTIAL],
1565                                XCB_ATOM_CARDINAL,
1566                                32,
1567                                12,
1568                                &strut_partial);
1569 }
1570
1571 /*
1572  * Reconfigure all bars and create new bars for recently activated outputs
1573  *
1574  */
1575 void reconfig_windows(bool redraw_bars) {
1576     uint32_t mask;
1577     uint32_t values[5];
1578     static bool tray_configured = false;
1579
1580     i3_output *walk;
1581     SLIST_FOREACH(walk, outputs, slist) {
1582         if (!walk->active) {
1583             /* If an output is not active, we destroy its bar */
1584             /* FIXME: Maybe we rather want to unmap? */
1585             DLOG("Destroying window for output %s\n", walk->name);
1586             destroy_window(walk);
1587             continue;
1588         }
1589         if (walk->bar.id == XCB_NONE) {
1590             DLOG("Creating window for output %s\n", walk->name);
1591
1592             xcb_window_t bar_id = xcb_generate_id(xcb_connection);
1593             xcb_pixmap_t buffer_id = xcb_generate_id(xcb_connection);
1594             mask = XCB_CW_BACK_PIXEL | XCB_CW_BORDER_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK | XCB_CW_COLORMAP;
1595
1596             values[0] = colors.bar_bg.colorpixel;
1597             values[1] = root_screen->black_pixel;
1598             /* If hide_on_modifier is set to hide or invisible mode, i3 is not supposed to manage our bar windows */
1599             values[2] = (config.hide_on_modifier == M_DOCK ? 0 : 1);
1600             /* We enable the following EventMask fields:
1601              * EXPOSURE, to get expose events (we have to re-draw then)
1602              * SUBSTRUCTURE_REDIRECT, to get ConfigureRequests when the tray
1603              *                        child windows use ConfigureWindow
1604              * BUTTON_PRESS, to handle clicks on the workspace buttons
1605              * */
1606             values[3] = XCB_EVENT_MASK_EXPOSURE |
1607                         XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT |
1608                         XCB_EVENT_MASK_BUTTON_PRESS;
1609             if (config.hide_on_modifier == M_DOCK) {
1610                 /* If the bar is normally visible, catch visibility change events to suspend
1611                  * the status process when the bar is obscured by full-screened windows.  */
1612                 values[3] |= XCB_EVENT_MASK_VISIBILITY_CHANGE;
1613                 walk->visible = true;
1614             }
1615             values[4] = colormap;
1616
1617             xcb_void_cookie_t win_cookie = xcb_create_window_checked(xcb_connection,
1618                                                                      depth,
1619                                                                      bar_id,
1620                                                                      xcb_root,
1621                                                                      walk->rect.x, walk->rect.y + walk->rect.h - bar_height,
1622                                                                      walk->rect.w, bar_height,
1623                                                                      0,
1624                                                                      XCB_WINDOW_CLASS_INPUT_OUTPUT,
1625                                                                      visual_type->visual_id,
1626                                                                      mask,
1627                                                                      values);
1628
1629             /* The double-buffer we use to render stuff off-screen */
1630             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1631                                                                     depth,
1632                                                                     buffer_id,
1633                                                                     bar_id,
1634                                                                     walk->rect.w,
1635                                                                     bar_height);
1636
1637             /* Set the WM_CLASS and WM_NAME (we don't need UTF-8) atoms */
1638             xcb_void_cookie_t class_cookie;
1639             class_cookie = xcb_change_property(xcb_connection,
1640                                                XCB_PROP_MODE_REPLACE,
1641                                                bar_id,
1642                                                XCB_ATOM_WM_CLASS,
1643                                                XCB_ATOM_STRING,
1644                                                8,
1645                                                (strlen("i3bar") + 1) * 2,
1646                                                "i3bar\0i3bar\0");
1647
1648             char *name;
1649             sasprintf(&name, "i3bar for output %s", walk->name);
1650             xcb_void_cookie_t name_cookie;
1651             name_cookie = xcb_change_property(xcb_connection,
1652                                               XCB_PROP_MODE_REPLACE,
1653                                               bar_id,
1654                                               XCB_ATOM_WM_NAME,
1655                                               XCB_ATOM_STRING,
1656                                               8,
1657                                               strlen(name),
1658                                               name);
1659             free(name);
1660
1661             /* We want dock windows (for now). When override_redirect is set, i3 is ignoring
1662              * this one */
1663             xcb_void_cookie_t dock_cookie = xcb_change_property(xcb_connection,
1664                                                                 XCB_PROP_MODE_REPLACE,
1665                                                                 bar_id,
1666                                                                 atoms[_NET_WM_WINDOW_TYPE],
1667                                                                 XCB_ATOM_ATOM,
1668                                                                 32,
1669                                                                 1,
1670                                                                 (unsigned char *)&atoms[_NET_WM_WINDOW_TYPE_DOCK]);
1671
1672             cairo_surface_init(&walk->bar, bar_id, walk->rect.w, bar_height);
1673             cairo_surface_init(&walk->buffer, buffer_id, walk->rect.w, bar_height);
1674
1675             xcb_void_cookie_t strut_cookie = config_strut_partial(walk);
1676
1677             /* We finally map the bar (display it on screen), unless the modifier-switch is on */
1678             xcb_void_cookie_t map_cookie;
1679             if (config.hide_on_modifier == M_DOCK) {
1680                 map_cookie = xcb_map_window_checked(xcb_connection, bar_id);
1681             }
1682
1683             if (xcb_request_failed(win_cookie, "Could not create window") ||
1684                 xcb_request_failed(pm_cookie, "Could not create pixmap") ||
1685                 xcb_request_failed(dock_cookie, "Could not set dock mode") ||
1686                 xcb_request_failed(class_cookie, "Could not set WM_CLASS") ||
1687                 xcb_request_failed(name_cookie, "Could not set WM_NAME") ||
1688                 xcb_request_failed(strut_cookie, "Could not set strut") ||
1689                 ((config.hide_on_modifier == M_DOCK) && xcb_request_failed(map_cookie, "Could not map window"))) {
1690                 exit(EXIT_FAILURE);
1691             }
1692
1693             const char *tray_output = (config.tray_output ? config.tray_output : SLIST_FIRST(outputs)->name);
1694             if (!tray_configured && strcasecmp(tray_output, "none") != 0) {
1695                 /* Configuration sanity check: ensure this i3bar instance handles the output on
1696                  * which the tray should appear (e.g. don’t initialize a tray if tray_output ==
1697                  * VGA-1 but output == [HDMI-1]).
1698                  */
1699                 i3_output *output;
1700                 SLIST_FOREACH(output, outputs, slist) {
1701                     if (strcasecmp(output->name, tray_output) == 0 ||
1702                         (strcasecmp(tray_output, "primary") == 0 && output->primary)) {
1703                         init_tray();
1704                         break;
1705                     }
1706                 }
1707                 tray_configured = true;
1708             }
1709         } else {
1710             /* We already have a bar, so we just reconfigure it */
1711             mask = XCB_CONFIG_WINDOW_X |
1712                    XCB_CONFIG_WINDOW_Y |
1713                    XCB_CONFIG_WINDOW_WIDTH |
1714                    XCB_CONFIG_WINDOW_HEIGHT |
1715                    XCB_CONFIG_WINDOW_STACK_MODE;
1716             values[0] = walk->rect.x;
1717             if (config.position == POS_TOP)
1718                 values[1] = walk->rect.y;
1719             else
1720                 values[1] = walk->rect.y + walk->rect.h - bar_height;
1721             values[2] = walk->rect.w;
1722             values[3] = bar_height;
1723             values[4] = XCB_STACK_MODE_ABOVE;
1724
1725             DLOG("Reconfiguring strut partial property for output %s\n", walk->name);
1726             xcb_void_cookie_t strut_cookie = config_strut_partial(walk);
1727
1728             DLOG("Destroying buffer for output %s\n", walk->name);
1729             xcb_free_pixmap(xcb_connection, walk->buffer.id);
1730
1731             DLOG("Reconfiguring window for output %s to %d,%d\n", walk->name, values[0], values[1]);
1732             xcb_void_cookie_t cfg_cookie = xcb_configure_window_checked(xcb_connection,
1733                                                                         walk->bar.id,
1734                                                                         mask,
1735                                                                         values);
1736
1737             mask = XCB_CW_OVERRIDE_REDIRECT;
1738             values[0] = (config.hide_on_modifier == M_DOCK ? 0 : 1);
1739             DLOG("Changing window attribute override_redirect for output %s to %d\n", walk->name, values[0]);
1740             xcb_void_cookie_t chg_cookie = xcb_change_window_attributes(xcb_connection,
1741                                                                         walk->bar.id,
1742                                                                         mask,
1743                                                                         values);
1744
1745             DLOG("Recreating buffer for output %s\n", walk->name);
1746             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1747                                                                     depth,
1748                                                                     walk->buffer.id,
1749                                                                     walk->bar.id,
1750                                                                     walk->rect.w,
1751                                                                     bar_height);
1752
1753             cairo_surface_free(&(walk->bar));
1754             cairo_surface_free(&(walk->buffer));
1755             cairo_surface_init(&(walk->bar), walk->bar.id, walk->rect.w, bar_height);
1756             cairo_surface_init(&(walk->buffer), walk->buffer.id, walk->rect.w, bar_height);
1757
1758             xcb_void_cookie_t map_cookie, umap_cookie;
1759             if (redraw_bars) {
1760                 /* Unmap the window, and draw it again when in dock mode */
1761                 umap_cookie = xcb_unmap_window_checked(xcb_connection, walk->bar.id);
1762                 if (config.hide_on_modifier == M_DOCK) {
1763                     cont_child();
1764                     map_cookie = xcb_map_window_checked(xcb_connection, walk->bar.id);
1765                 } else {
1766                     stop_child();
1767                 }
1768
1769                 if (config.hide_on_modifier == M_HIDE) {
1770                     /* Switching to hide mode, register for keyevents */
1771                     register_xkb_keyevents();
1772                 } else {
1773                     /* Switching to dock/invisible mode, deregister from keyevents */
1774                     deregister_xkb_keyevents();
1775                 }
1776             }
1777
1778             if (xcb_request_failed(cfg_cookie, "Could not reconfigure window") ||
1779                 xcb_request_failed(chg_cookie, "Could not change window") ||
1780                 xcb_request_failed(pm_cookie, "Could not create pixmap") ||
1781                 xcb_request_failed(strut_cookie, "Could not set strut") ||
1782                 (redraw_bars && (xcb_request_failed(umap_cookie, "Could not unmap window") ||
1783                                  (config.hide_on_modifier == M_DOCK && xcb_request_failed(map_cookie, "Could not map window"))))) {
1784                 exit(EXIT_FAILURE);
1785             }
1786         }
1787     }
1788 }
1789
1790 /*
1791  * Render the bars, with buttons and statusline
1792  *
1793  */
1794 void draw_bars(bool unhide) {
1795     DLOG("Drawing bars...\n");
1796     int workspace_width = 0;
1797     /* Is the currently-rendered statusline using short_text items? */
1798     bool rendered_statusline_is_short = false;
1799
1800     refresh_statusline(false);
1801
1802     i3_output *outputs_walk;
1803     SLIST_FOREACH(outputs_walk, outputs, slist) {
1804         if (!outputs_walk->active) {
1805             DLOG("Output %s inactive, skipping...\n", outputs_walk->name);
1806             continue;
1807         }
1808         if (outputs_walk->bar.id == XCB_NONE) {
1809             /* Oh shit, an active output without an own bar. Create it now! */
1810             reconfig_windows(false);
1811         }
1812
1813         /* First things first: clear the backbuffer */
1814         cairo_save(outputs_walk->buffer.cr);
1815         cairo_set_source_color(&(outputs_walk->buffer), colors.bar_bg);
1816         cairo_set_operator(outputs_walk->buffer.cr, CAIRO_OPERATOR_SOURCE);
1817         cairo_paint(outputs_walk->buffer.cr);
1818         cairo_restore(outputs_walk->buffer.cr);
1819
1820         if (!config.disable_ws) {
1821             i3_ws *ws_walk;
1822             TAILQ_FOREACH(ws_walk, outputs_walk->workspaces, tailq) {
1823                 DLOG("Drawing button for WS %s at x = %d, len = %d\n",
1824                      i3string_as_utf8(ws_walk->name), workspace_width, ws_walk->name_width);
1825                 color_t fg_color = colors.inactive_ws_fg;
1826                 color_t bg_color = colors.inactive_ws_bg;
1827                 color_t border_color = colors.inactive_ws_border;
1828                 if (ws_walk->visible) {
1829                     if (!ws_walk->focused) {
1830                         fg_color = colors.active_ws_fg;
1831                         bg_color = colors.active_ws_bg;
1832                         border_color = colors.active_ws_border;
1833                     } else {
1834                         fg_color = colors.focus_ws_fg;
1835                         bg_color = colors.focus_ws_bg;
1836                         border_color = colors.focus_ws_border;
1837                     }
1838                 }
1839                 if (ws_walk->urgent) {
1840                     DLOG("WS %s is urgent!\n", i3string_as_utf8(ws_walk->name));
1841                     fg_color = colors.urgent_ws_fg;
1842                     bg_color = colors.urgent_ws_bg;
1843                     border_color = colors.urgent_ws_border;
1844                     unhide = true;
1845                 }
1846
1847                 cairo_save(outputs_walk->buffer.cr);
1848                 cairo_set_operator(outputs_walk->buffer.cr, CAIRO_OPERATOR_SOURCE);
1849
1850                 /* Draw the border of the button. */
1851                 cairo_set_source_color(&(outputs_walk->buffer), border_color);
1852                 cairo_rectangle(outputs_walk->buffer.cr, workspace_width, logical_px(1),
1853                                 ws_walk->name_width + 2 * logical_px(ws_hoff_px) + 2 * logical_px(1),
1854                                 font.height + 2 * logical_px(ws_voff_px) - 2 * logical_px(1));
1855                 cairo_fill(outputs_walk->buffer.cr);
1856
1857                 /* Draw the inside of the button. */
1858                 cairo_set_source_color(&(outputs_walk->buffer), bg_color);
1859                 cairo_rectangle(outputs_walk->buffer.cr, workspace_width + logical_px(1), 2 * logical_px(1),
1860                                 ws_walk->name_width + 2 * logical_px(ws_hoff_px),
1861                                 font.height + 2 * logical_px(ws_voff_px) - 4 * logical_px(1));
1862                 cairo_fill(outputs_walk->buffer.cr);
1863
1864                 cairo_restore(outputs_walk->buffer.cr);
1865
1866                 set_font_colors(outputs_walk->buffer.gc, fg_color.colorpixel, bg_color.colorpixel);
1867                 draw_text(ws_walk->name, outputs_walk->buffer.id, outputs_walk->buffer.gc, visual_type,
1868                           workspace_width + logical_px(ws_hoff_px) + logical_px(1),
1869                           logical_px(ws_voff_px),
1870                           ws_walk->name_width);
1871
1872                 workspace_width += 2 * logical_px(ws_hoff_px) + 2 * logical_px(1) + ws_walk->name_width;
1873                 if (TAILQ_NEXT(ws_walk, tailq) != NULL)
1874                     workspace_width += logical_px(ws_spacing_px);
1875             }
1876         }
1877
1878         if (binding.name && !config.disable_binding_mode_indicator) {
1879             workspace_width += logical_px(ws_spacing_px);
1880
1881             color_t fg_color = colors.binding_mode_fg;
1882             color_t bg_color = colors.binding_mode_bg;
1883
1884             cairo_save(outputs_walk->buffer.cr);
1885             cairo_set_operator(outputs_walk->buffer.cr, CAIRO_OPERATOR_SOURCE);
1886
1887             cairo_set_source_color(&(outputs_walk->buffer), colors.binding_mode_border);
1888             cairo_rectangle(outputs_walk->buffer.cr, workspace_width, logical_px(1),
1889                             binding.width + 2 * logical_px(ws_hoff_px) + 2 * logical_px(1),
1890                             font.height + 2 * logical_px(ws_voff_px) - 2 * logical_px(1));
1891             cairo_fill(outputs_walk->buffer.cr);
1892
1893             cairo_set_source_color(&(outputs_walk->buffer), bg_color);
1894             cairo_rectangle(outputs_walk->buffer.cr, workspace_width + logical_px(1), 2 * logical_px(1),
1895                             binding.width + 2 * logical_px(ws_hoff_px),
1896                             font.height + 2 * logical_px(ws_voff_px) - 4 * logical_px(1));
1897             cairo_fill(outputs_walk->buffer.cr);
1898
1899             cairo_restore(outputs_walk->buffer.cr);
1900
1901             set_font_colors(outputs_walk->buffer.gc, fg_color.colorpixel, bg_color.colorpixel);
1902             draw_text(binding.name,
1903                       outputs_walk->buffer.id,
1904                       outputs_walk->buffer.gc,
1905                       visual_type,
1906                       workspace_width + logical_px(ws_hoff_px) + logical_px(1),
1907                       logical_px(ws_voff_px),
1908                       binding.width);
1909
1910             unhide = true;
1911             workspace_width += 2 * logical_px(ws_hoff_px) + 2 * logical_px(1) + binding.width;
1912         }
1913
1914         if (!TAILQ_EMPTY(&statusline_head)) {
1915             DLOG("Printing statusline!\n");
1916
1917             int tray_width = get_tray_width(outputs_walk->trayclients);
1918             uint32_t max_statusline_width = outputs_walk->rect.w - workspace_width - tray_width - 2 * logical_px(sb_hoff_px);
1919
1920             /* If the statusline is too long, try to use short texts. */
1921             if (statusline_width > max_statusline_width) {
1922                 /* If the currently rendered statusline is long, render a short status line */
1923                 refresh_statusline(true);
1924                 rendered_statusline_is_short = true;
1925             } else if (rendered_statusline_is_short) {
1926                 /* If the currently rendered statusline is short, render a long status line */
1927                 refresh_statusline(false);
1928                 rendered_statusline_is_short = false;
1929             }
1930
1931             /* Luckily we already prepared a seperate pixmap containing the rendered
1932              * statusline, we just have to copy the relevant parts to the relevant
1933              * position */
1934             int visible_statusline_width = MIN(statusline_width, max_statusline_width);
1935             int x_src = (int16_t)(statusline_width - visible_statusline_width);
1936             int x_dest = (int16_t)(outputs_walk->rect.w - tray_width - logical_px(sb_hoff_px) - visible_statusline_width);
1937
1938             cairo_save(outputs_walk->buffer.cr);
1939             cairo_set_operator(outputs_walk->buffer.cr, CAIRO_OPERATOR_SOURCE);
1940             cairo_set_source_surface(outputs_walk->buffer.cr, statusline_surface.surface, x_dest - x_src, 0);
1941             cairo_rectangle(outputs_walk->buffer.cr, x_dest, 0, (int16_t)visible_statusline_width, (int16_t)bar_height);
1942             cairo_fill(outputs_walk->buffer.cr);
1943             cairo_restore(outputs_walk->buffer.cr);
1944         }
1945
1946         workspace_width = 0;
1947     }
1948
1949     /* Assure the bar is hidden/unhidden according to the specified hidden_state and mode */
1950     if (mod_pressed ||
1951         config.hidden_state == S_SHOW ||
1952         unhide) {
1953         unhide_bars();
1954     } else if (config.hide_on_modifier == M_HIDE) {
1955         hide_bars();
1956     }
1957
1958     redraw_bars();
1959 }
1960
1961 /*
1962  * Redraw the bars, i.e. simply copy the buffer to the barwindow
1963  *
1964  */
1965 void redraw_bars(void) {
1966     i3_output *outputs_walk;
1967     SLIST_FOREACH(outputs_walk, outputs, slist) {
1968         if (!outputs_walk->active) {
1969             continue;
1970         }
1971
1972         cairo_save(outputs_walk->bar.cr);
1973         cairo_set_operator(outputs_walk->bar.cr, CAIRO_OPERATOR_SOURCE);
1974         cairo_set_source_surface(outputs_walk->bar.cr, outputs_walk->buffer.surface, 0, 0);
1975         cairo_rectangle(outputs_walk->bar.cr, 0, 0, outputs_walk->rect.w, outputs_walk->rect.h);
1976         cairo_fill(outputs_walk->bar.cr);
1977         cairo_restore(outputs_walk->bar.cr);
1978
1979         xcb_flush(xcb_connection);
1980     }
1981 }
1982
1983 /*
1984  * Set the current binding mode
1985  *
1986  */
1987 void set_current_mode(struct mode *current) {
1988     I3STRING_FREE(binding.name);
1989     binding = *current;
1990     activated_mode = binding.name != NULL;
1991     return;
1992 }