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  * © 2010-2011 Axel Wagner and contributors (see also: LICENSE)
   6  *
   7  * xcb.c: Communicating with X
   8  *
   9  */
  10 #include <xcb/xcb.h>
  11 #include <xcb/xproto.h>
  12 #include <xcb/xcb_atom.h>
  13
  14 #ifdef XCB_COMPAT
  15 #include "xcb_compat.h"
  16 #endif
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <unistd.h>
  21 #include <fcntl.h>
  22 #include <string.h>
  23 #include <i3/ipc.h>
  24 #include <ev.h>
  25 #include <errno.h>
  26 #include <limits.h>
  27 #include <err.h>
  28
  29 #include <X11/Xlib.h>
  30 #include <X11/XKBlib.h>
  31 #include <X11/extensions/XKB.h>
  32
  33 #include "common.h"
  34 #include "libi3.h"
  35
  36 /* We save the Atoms in an easy to access array, indexed by an enum */
  37 enum {
  38     #define ATOM_DO(name) name,
  39     #include "xcb_atoms.def"
  40     NUM_ATOMS
  41 };
  42
  43 xcb_intern_atom_cookie_t atom_cookies[NUM_ATOMS];
  44 xcb_atom_t               atoms[NUM_ATOMS];
  45
  46 /* Variables, that are the same for all functions at all times */
  47 xcb_connection_t *xcb_connection;
  48 int              screen;
  49 xcb_screen_t     *xcb_screen;
  50 xcb_window_t     xcb_root;
  51 xcb_font_t       xcb_font;
  52
  53 /* We need to cache some data to speed up text-width-prediction */
  54 xcb_query_font_reply_t *font_info;
  55 int                    font_height;
  56 xcb_charinfo_t         *font_table;
  57
  58 /* These are only relevant for XKB, which we only need for grabbing modifiers */
  59 Display          *xkb_dpy;
  60 int              xkb_event_base;
  61 int              mod_pressed = 0;
  62
  63 /* Because the statusline is the same on all outputs, we have
  64  * global buffer to render it on */
  65 xcb_gcontext_t   statusline_ctx;
  66 xcb_gcontext_t   statusline_clear;
  67 xcb_pixmap_t     statusline_pm;
  68 uint32_t         statusline_width;
  69
  70 /* Event-Watchers, to interact with the user */
  71 ev_prepare *xcb_prep;
  72 ev_check   *xcb_chk;
  73 ev_io      *xcb_io;
  74 ev_io      *xkb_io;
  75
  76 /* The parsed colors */
  77 struct xcb_colors_t {
  78     uint32_t bar_fg;
  79     uint32_t bar_bg;
  80     uint32_t active_ws_fg;
  81     uint32_t active_ws_bg;
  82     uint32_t inactive_ws_fg;
  83     uint32_t inactive_ws_bg;
  84     uint32_t urgent_ws_bg;
  85     uint32_t urgent_ws_fg;
  86     uint32_t focus_ws_bg;
  87     uint32_t focus_ws_fg;
  88 };
  89 struct xcb_colors_t colors;
  90
  91 /* We define xcb_request_failed as a macro to include the relevant line-number */
  92 #define xcb_request_failed(cookie, err_msg) _xcb_request_failed(cookie, err_msg, __LINE__)
  93 int _xcb_request_failed(xcb_void_cookie_t cookie, char *err_msg, int line) {
  94     xcb_generic_error_t *err;
  95     if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
  96         fprintf(stderr, "[%s:%d] ERROR: %s. X Error Code: %d\n", __FILE__, line, err_msg, err->error_code);
  97         return err->error_code;
  98     }
  99     return 0;
 100 }
 101
 102 /*
 103  * Predicts the length of text based on cached data.
 104  * The string has to be encoded in ucs2 and glyph_len has to be the length
 105  * of the string (in glyphs).
 106  *
 107  */
 108 uint32_t predict_text_extents(xcb_char2b_t *text, uint32_t length) {
 109     /* If we don't have per-character data, return the maximum width */
 110     if (font_table == NULL) {
 111         return (font_info->max_bounds.character_width * length);
 112     }
 113
 114     uint32_t width = 0;
 115     uint32_t i;
 116
 117     for (i = 0; i < length; i++) {
 118         xcb_charinfo_t *info;
 119         int row = text[i].byte1;
 120         int col = text[i].byte2;
 121
 122         if (row < font_info->min_byte1 || row > font_info->max_byte1 ||
 123             col < font_info->min_char_or_byte2 || col > font_info->max_char_or_byte2) {
 124             continue;
 125         }
 126
 127         /* Don't you ask me, how this one works… */
 128         info = &font_table[((row - font_info->min_byte1) *
 129                             (font_info->max_char_or_byte2 - font_info->min_char_or_byte2 + 1)) +
 130                            (col - font_info->min_char_or_byte2)];
 131
 132         if (info->character_width != 0 ||
 133             (info->right_side_bearing |
 134              info->left_side_bearing |
 135              info->ascent |
 136              info->descent) != 0) {
 137             width += info->character_width;
 138         }
 139     }
 140
 141     return width;
 142 }
 143
 144 /*
 145  * Draws text given in UCS-2-encoding to a given drawable and position
 146  *
 147  */
 148 void draw_text(xcb_drawable_t drawable, xcb_gcontext_t ctx, int16_t x, int16_t y,
 149                xcb_char2b_t *text, uint32_t glyph_count) {
 150     int offset = 0;
 151     int16_t pos_x = x;
 152     int16_t font_ascent = font_info->font_ascent;
 153
 154     while (glyph_count > 0) {
 155         uint8_t chunk_size = MIN(255, glyph_count);
 156         uint32_t chunk_width = predict_text_extents(text + offset, chunk_size);
 157
 158         xcb_image_text_16(xcb_connection,
 159                           chunk_size,
 160                           drawable,
 161                           ctx,
 162                           pos_x, y + font_ascent,
 163                           text + offset);
 164
 165         offset += chunk_size;
 166         pos_x += chunk_width;
 167         glyph_count -= chunk_size;
 168     }
 169 }
 170
 171 /*
 172  * Redraws the statusline to the buffer
 173  *
 174  */
 175 void refresh_statusline() {
 176     int glyph_count;
 177
 178     if (statusline == NULL) {
 179         return;
 180     }
 181
 182     xcb_char2b_t *text = (xcb_char2b_t*) convert_utf8_to_ucs2(statusline, &glyph_count);
 183     uint32_t old_statusline_width = statusline_width;
 184     statusline_width = predict_text_extents(text, glyph_count);
 185     /* If the statusline is bigger than our screen we need to make sure that
 186      * the pixmap provides enough space, so re-allocate if the width grew */
 187     if (statusline_width > xcb_screen->width_in_pixels &&
 188         statusline_width > old_statusline_width)
 189         realloc_sl_buffer();
 190
 191     xcb_rectangle_t rect = { 0, 0, xcb_screen->width_in_pixels, font_height };
 192     xcb_poly_fill_rectangle(xcb_connection, statusline_pm, statusline_clear, 1, &rect);
 193     draw_text(statusline_pm, statusline_ctx, 0, 0, text, glyph_count);
 194
 195     FREE(text);
 196 }
 197
 198 /*
 199  * Hides all bars (unmaps them)
 200  *
 201  */
 202 void hide_bars() {
 203     if (!config.hide_on_modifier) {
 204         return;
 205     }
 206
 207     i3_output *walk;
 208     SLIST_FOREACH(walk, outputs, slist) {
 209         if (!walk->active) {
 210             continue;
 211         }
 212         xcb_unmap_window(xcb_connection, walk->bar);
 213     }
 214     stop_child();
 215 }
 216
 217 /*
 218  * Unhides all bars (maps them)
 219  *
 220  */
 221 void unhide_bars() {
 222     if (!config.hide_on_modifier) {
 223         return;
 224     }
 225
 226     i3_output           *walk;
 227     xcb_void_cookie_t   cookie;
 228     uint32_t            mask;
 229     uint32_t            values[5];
 230
 231     cont_child();
 232
 233     SLIST_FOREACH(walk, outputs, slist) {
 234         if (walk->bar == XCB_NONE) {
 235             continue;
 236         }
 237         mask = XCB_CONFIG_WINDOW_X |
 238                XCB_CONFIG_WINDOW_Y |
 239                XCB_CONFIG_WINDOW_WIDTH |
 240                XCB_CONFIG_WINDOW_HEIGHT |
 241                XCB_CONFIG_WINDOW_STACK_MODE;
 242         values[0] = walk->rect.x;
 243         if (config.position == POS_TOP)
 244             values[1] = walk->rect.y;
 245         else values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 246         values[2] = walk->rect.w;
 247         values[3] = font_height + 6;
 248         values[4] = XCB_STACK_MODE_ABOVE;
 249         DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 250         cookie = xcb_configure_window_checked(xcb_connection,
 251                                               walk->bar,
 252                                               mask,
 253                                               values);
 254
 255         if (xcb_request_failed(cookie, "Could not reconfigure window")) {
 256             exit(EXIT_FAILURE);
 257         }
 258         xcb_map_window(xcb_connection, walk->bar);
 259     }
 260 }
 261
 262 /*
 263  * Parse the colors into a format that we can use
 264  *
 265  */
 266 void init_colors(const struct xcb_color_strings_t *new_colors) {
 267 #define PARSE_COLOR(name, def) \
 268     do { \
 269         colors.name = get_colorpixel(new_colors->name ? new_colors->name : def); \
 270     } while  (0)
 271     PARSE_COLOR(bar_fg, "#FFFFFF");
 272     PARSE_COLOR(bar_bg, "#000000");
 273     PARSE_COLOR(active_ws_fg, "#888888");
 274     PARSE_COLOR(active_ws_bg, "#222222");
 275     PARSE_COLOR(inactive_ws_fg, "#888888");
 276     PARSE_COLOR(inactive_ws_bg, "#222222");
 277     PARSE_COLOR(urgent_ws_fg, "#FFFFFF");
 278     PARSE_COLOR(urgent_ws_bg, "#900000");
 279     PARSE_COLOR(focus_ws_fg, "#FFFFFF");
 280     PARSE_COLOR(focus_ws_bg, "#285577");
 281 #undef PARSE_COLOR
 282 }
 283
 284 /*
 285  * Handle a button-press-event (i.e. a mouse click on one of our bars).
 286  * We determine, whether the click occured on a ws-button or if the scroll-
 287  * wheel was used and change the workspace appropriately
 288  *
 289  */
 290 void handle_button(xcb_button_press_event_t *event) {
 291     i3_ws *cur_ws;
 292
 293     /* Determine, which bar was clicked */
 294     i3_output *walk;
 295     xcb_window_t bar = event->event;
 296     SLIST_FOREACH(walk, outputs, slist) {
 297         if (walk->bar == bar) {
 298             break;
 299         }
 300     }
 301
 302     if (walk == NULL) {
 303         DLOG("Unknown Bar klicked!\n");
 304         return;
 305     }
 306
 307     /* TODO: Move this to extern get_ws_for_output() */
 308     TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 309         if (cur_ws->visible) {
 310             break;
 311         }
 312     }
 313
 314     if (cur_ws == NULL) {
 315         DLOG("No Workspace active?\n");
 316         return;
 317     }
 318
 319     int32_t x = event->event_x;
 320
 321     DLOG("Got Button %d\n", event->detail);
 322
 323     switch (event->detail) {
 324         case 1:
 325             /* Left Mousbutton. We determine, which button was clicked
 326              * and set cur_ws accordingly */
 327             TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 328                 DLOG("x = %d\n", x);
 329                 if (x < cur_ws->name_width + 10) {
 330                     break;
 331                 }
 332                 x -= cur_ws->name_width + 10;
 333             }
 334             if (cur_ws == NULL) {
 335                 return;
 336             }
 337             break;
 338         case 4:
 339             /* Mouse wheel down. We select the next ws */
 340             if (cur_ws == TAILQ_FIRST(walk->workspaces)) {
 341                 cur_ws = TAILQ_LAST(walk->workspaces, ws_head);
 342             } else {
 343                 cur_ws = TAILQ_PREV(cur_ws, ws_head, tailq);
 344             }
 345             break;
 346         case 5:
 347             /* Mouse wheel up. We select the previos ws */
 348             if (cur_ws == TAILQ_LAST(walk->workspaces, ws_head)) {
 349                 cur_ws = TAILQ_FIRST(walk->workspaces);
 350             } else {
 351                 cur_ws = TAILQ_NEXT(cur_ws, tailq);
 352             }
 353             break;
 354     }
 355
 356     const size_t len = strlen(cur_ws->name) + strlen("workspace \"\"") + 1;
 357     char buffer[len];
 358     snprintf(buffer, len, "workspace \"%s\"", cur_ws->name);
 359     i3_send_msg(I3_IPC_MESSAGE_TYPE_COMMAND, buffer);
 360 }
 361
 362 /*
 363  * Configures the x coordinate of all trayclients. To be called after adding a
 364  * new tray client or removing an old one.
 365  *
 366  */
 367 static void configure_trayclients() {
 368     trayclient *trayclient;
 369     i3_output *output;
 370     SLIST_FOREACH(output, outputs, slist) {
 371         if (!output->active)
 372             continue;
 373
 374         int clients = 0;
 375         TAILQ_FOREACH_REVERSE(trayclient, output->trayclients, tc_head, tailq) {
 376             clients++;
 377
 378             DLOG("Configuring tray window %08x to x=%d\n",
 379                  trayclient->win, output->rect.w - (clients * (font_height + 2)));
 380             uint32_t x = output->rect.w - (clients * (font_height + 2));
 381             xcb_configure_window(xcb_connection,
 382                                  trayclient->win,
 383                                  XCB_CONFIG_WINDOW_X,
 384                                  &x);
 385         }
 386     }
 387 }
 388
 389 /*
 390  * Handles ClientMessages (messages sent from another client directly to us).
 391  *
 392  * At the moment, only the tray window will receive client messages. All
 393  * supported client messages currently are _NET_SYSTEM_TRAY_OPCODE.
 394  *
 395  */
 396 static void handle_client_message(xcb_client_message_event_t* event) {
 397     if (event->type == atoms[_NET_SYSTEM_TRAY_OPCODE] &&
 398         event->format == 32) {
 399         DLOG("_NET_SYSTEM_TRAY_OPCODE received\n");
 400         /* event->data.data32[0] is the timestamp */
 401         uint32_t op = event->data.data32[1];
 402         uint32_t mask;
 403         uint32_t values[2];
 404         if (op == SYSTEM_TRAY_REQUEST_DOCK) {
 405             xcb_window_t client = event->data.data32[2];
 406
 407             /* Listen for PropertyNotify events to get the most recent value of
 408              * the XEMBED_MAPPED atom, also listen for UnmapNotify events */
 409             mask = XCB_CW_EVENT_MASK;
 410             values[0] = XCB_EVENT_MASK_PROPERTY_CHANGE |
 411                         XCB_EVENT_MASK_STRUCTURE_NOTIFY;
 412             xcb_change_window_attributes(xcb_connection,
 413                                          client,
 414                                          mask,
 415                                          values);
 416
 417             /* Request the _XEMBED_INFO property. The XEMBED specification
 418              * (which is referred by the tray specification) says this *has* to
 419              * be set, but VLC does not set it… */
 420             bool map_it = true;
 421             int xe_version = 1;
 422             xcb_get_property_cookie_t xembedc;
 423             xembedc = xcb_get_property_unchecked(xcb_connection,
 424                                                  0,
 425                                                  client,
 426                                                  atoms[_XEMBED_INFO],
 427                                                  XCB_GET_PROPERTY_TYPE_ANY,
 428                                                  0,
 429                                                  2 * 32);
 430
 431             xcb_get_property_reply_t *xembedr = xcb_get_property_reply(xcb_connection,
 432                                                                        xembedc,
 433                                                                        NULL);
 434             if (xembedr != NULL && xembedr->length != 0) {
 435                 DLOG("xembed format = %d, len = %d\n", xembedr->format, xembedr->length);
 436                 uint32_t *xembed = xcb_get_property_value(xembedr);
 437                 DLOG("xembed version = %d\n", xembed[0]);
 438                 DLOG("xembed flags = %d\n", xembed[1]);
 439                 map_it = ((xembed[1] & XEMBED_MAPPED) == XEMBED_MAPPED);
 440                 xe_version = xembed[0];
 441                 if (xe_version > 1)
 442                     xe_version = 1;
 443                 free(xembedr);
 444             } else {
 445                 ELOG("Window %08x violates the XEMBED protocol, _XEMBED_INFO not set\n", client);
 446             }
 447
 448             DLOG("X window %08x requested docking\n", client);
 449             i3_output *walk, *output = NULL;
 450             SLIST_FOREACH(walk, outputs, slist) {
 451                 if (!walk->active)
 452                     continue;
 453                 if (config.tray_output &&
 454                     strcasecmp(walk->name, config.tray_output) != 0)
 455                     continue;
 456                 DLOG("using output %s\n", walk->name);
 457                 output = walk;
 458             }
 459             if (output == NULL) {
 460                 ELOG("No output found\n");
 461                 return;
 462             }
 463             xcb_reparent_window(xcb_connection,
 464                                 client,
 465                                 output->bar,
 466                                 output->rect.w - font_height - 2,
 467                                 2);
 468             /* We reconfigure the window to use a reasonable size. The systray
 469              * specification explicitly says:
 470              *   Tray icons may be assigned any size by the system tray, and
 471              *   should do their best to cope with any size effectively
 472              */
 473             mask = XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
 474             values[0] = font_height;
 475             values[1] = font_height;
 476             xcb_configure_window(xcb_connection,
 477                                  client,
 478                                  mask,
 479                                  values);
 480
 481             /* send the XEMBED_EMBEDDED_NOTIFY message */
 482             void *event = scalloc(32);
 483             xcb_client_message_event_t *ev = event;
 484             ev->response_type = XCB_CLIENT_MESSAGE;
 485             ev->window = client;
 486             ev->type = atoms[_XEMBED];
 487             ev->format = 32;
 488             ev->data.data32[0] = XCB_CURRENT_TIME;
 489             ev->data.data32[1] = atoms[XEMBED_EMBEDDED_NOTIFY];
 490             ev->data.data32[2] = output->bar;
 491             ev->data.data32[3] = xe_version;
 492             xcb_send_event(xcb_connection,
 493                            0,
 494                            client,
 495                            XCB_EVENT_MASK_NO_EVENT,
 496                            (char*)ev);
 497             free(event);
 498
 499             /* Put the client inside the save set. Upon termination (whether
 500              * killed or normal exit does not matter) of i3bar, these clients
 501              * will be correctly reparented to their most closest living
 502              * ancestor. Without this, tray icons might die when i3bar
 503              * exits/crashes. */
 504             xcb_change_save_set(xcb_connection, XCB_SET_MODE_INSERT, client);
 505
 506             if (map_it) {
 507                 DLOG("Mapping dock client\n");
 508                 xcb_map_window(xcb_connection, client);
 509             } else {
 510                 DLOG("Not mapping dock client yet\n");
 511             }
 512             trayclient *tc = smalloc(sizeof(trayclient));
 513             tc->win = client;
 514             tc->mapped = map_it;
 515             tc->xe_version = xe_version;
 516             TAILQ_INSERT_TAIL(output->trayclients, tc, tailq);
 517
 518             /* Trigger an update to copy the statusline text to the appropriate
 519              * position */
 520             configure_trayclients();
 521             draw_bars();
 522         }
 523     }
 524 }
 525
 526 /*
 527  * Handles UnmapNotify events. These events happen when a tray window unmaps
 528  * itself. We then update our data structure
 529  *
 530  */
 531 static void handle_unmap_notify(xcb_unmap_notify_event_t* event) {
 532     DLOG("UnmapNotify for window = %08x, event = %08x\n", event->window, event->event);
 533
 534     i3_output *walk;
 535     SLIST_FOREACH(walk, outputs, slist) {
 536         if (!walk->active)
 537             continue;
 538         DLOG("checking output %s\n", walk->name);
 539         trayclient *trayclient;
 540         TAILQ_FOREACH(trayclient, walk->trayclients, tailq) {
 541             if (trayclient->win != event->window)
 542                 continue;
 543
 544             DLOG("Removing tray client with window ID %08x\n", event->window);
 545             TAILQ_REMOVE(walk->trayclients, trayclient, tailq);
 546
 547             /* Trigger an update, we now have more space for the statusline */
 548             configure_trayclients();
 549             draw_bars();
 550             return;
 551         }
 552     }
 553 }
 554
 555 /*
 556  * Handle PropertyNotify messages. Currently only the _XEMBED_INFO property is
 557  * handled, which tells us whether a dock client should be mapped or unmapped.
 558  *
 559  */
 560 static void handle_property_notify(xcb_property_notify_event_t *event) {
 561     DLOG("PropertyNotify\n");
 562     if (event->atom == atoms[_XEMBED_INFO] &&
 563         event->state == XCB_PROPERTY_NEW_VALUE) {
 564         DLOG("xembed_info updated\n");
 565         trayclient *trayclient = NULL, *walk;
 566         i3_output *o_walk;
 567         SLIST_FOREACH(o_walk, outputs, slist) {
 568             if (!o_walk->active)
 569                 continue;
 570
 571             TAILQ_FOREACH(walk, o_walk->trayclients, tailq) {
 572                 if (walk->win != event->window)
 573                     continue;
 574                 trayclient = walk;
 575                 break;
 576             }
 577
 578             if (trayclient)
 579                 break;
 580         }
 581         if (!trayclient) {
 582             ELOG("PropertyNotify received for unknown window %08x\n",
 583                  event->window);
 584             return;
 585         }
 586         xcb_get_property_cookie_t xembedc;
 587         xembedc = xcb_get_property_unchecked(xcb_connection,
 588                                              0,
 589                                              trayclient->win,
 590                                              atoms[_XEMBED_INFO],
 591                                              XCB_GET_PROPERTY_TYPE_ANY,
 592                                              0,
 593                                              2 * 32);
 594
 595         xcb_get_property_reply_t *xembedr = xcb_get_property_reply(xcb_connection,
 596                                                                    xembedc,
 597                                                                    NULL);
 598         if (xembedr == NULL || xembedr->length == 0)
 599             return;
 600
 601         DLOG("xembed format = %d, len = %d\n", xembedr->format, xembedr->length);
 602         uint32_t *xembed = xcb_get_property_value(xembedr);
 603         DLOG("xembed version = %d\n", xembed[0]);
 604         DLOG("xembed flags = %d\n", xembed[1]);
 605         bool map_it = ((xembed[1] & XEMBED_MAPPED) == XEMBED_MAPPED);
 606         DLOG("map-state now %d\n", map_it);
 607         if (trayclient->mapped && !map_it) {
 608             /* need to unmap the window */
 609             xcb_unmap_window(xcb_connection, trayclient->win);
 610             trayclient->mapped = map_it;
 611             draw_bars();
 612         } else if (!trayclient->mapped && map_it) {
 613             /* need to map the window */
 614             xcb_map_window(xcb_connection, trayclient->win);
 615             trayclient->mapped = map_it;
 616             draw_bars();
 617         }
 618         free(xembedr);
 619     }
 620 }
 621
 622 /*
 623  * Handle ConfigureRequests by denying them and sending the client a
 624  * ConfigureNotify with its actual size.
 625  *
 626  */
 627 static void handle_configure_request(xcb_configure_request_event_t *event) {
 628     DLOG("ConfigureRequest for window = %08x\n", event->window);
 629
 630     trayclient *trayclient;
 631     i3_output *output;
 632     SLIST_FOREACH(output, outputs, slist) {
 633         if (!output->active)
 634             continue;
 635
 636         int clients = 0;
 637         TAILQ_FOREACH_REVERSE(trayclient, output->trayclients, tc_head, tailq) {
 638             clients++;
 639
 640             if (trayclient->win != event->window)
 641                 continue;
 642
 643             xcb_rectangle_t rect;
 644             rect.x = output->rect.w - (clients * (font_height + 2));
 645             rect.y = 2;
 646             rect.width = font_height;
 647             rect.height = font_height;
 648
 649             DLOG("This is a tray window. x = %d\n", rect.x);
 650             fake_configure_notify(xcb_connection, rect, event->window, 0);
 651             return;
 652         }
 653     }
 654
 655     DLOG("WARNING: Could not find corresponding tray window.\n");
 656 }
 657
 658 /*
 659  * This function is called immediately before the main loop locks. We flush xcb
 660  * then (and only then)
 661  *
 662  */
 663 void xcb_prep_cb(struct ev_loop *loop, ev_prepare *watcher, int revents) {
 664     xcb_flush(xcb_connection);
 665 }
 666
 667 /*
 668  * This function is called immediately after the main loop locks, so when one
 669  * of the watchers registered an event.
 670  * We check whether an X-Event arrived and handle it.
 671  *
 672  */
 673 void xcb_chk_cb(struct ev_loop *loop, ev_check *watcher, int revents) {
 674     xcb_generic_event_t *event;
 675
 676     if (xcb_connection_has_error(xcb_connection)) {
 677         ELOG("X11 connection was closed unexpectedly - maybe your X server terminated / crashed?\n");
 678         exit(1);
 679     }
 680
 681     while ((event = xcb_poll_for_event(xcb_connection)) == NULL) {
 682         return;
 683     }
 684
 685     switch (event->response_type & ~0x80) {
 686         case XCB_EXPOSE:
 687             /* Expose-events happen, when the window needs to be redrawn */
 688             redraw_bars();
 689             break;
 690         case XCB_BUTTON_PRESS:
 691             /* Button-press-events are mouse-buttons clicked on one of our bars */
 692             handle_button((xcb_button_press_event_t*) event);
 693             break;
 694         case XCB_CLIENT_MESSAGE:
 695             /* Client messages are used for client-to-client communication, for
 696              * example system tray widgets talk to us directly via client messages. */
 697             handle_client_message((xcb_client_message_event_t*) event);
 698             break;
 699         case XCB_UNMAP_NOTIFY:
 700             /* UnmapNotifies are received when a tray window unmaps itself */
 701             handle_unmap_notify((xcb_unmap_notify_event_t*) event);
 702             break;
 703         case XCB_PROPERTY_NOTIFY:
 704             /* PropertyNotify */
 705             handle_property_notify((xcb_property_notify_event_t*) event);
 706             break;
 707         case XCB_CONFIGURE_REQUEST:
 708             /* ConfigureRequest, sent by a tray child */
 709             handle_configure_request((xcb_configure_request_event_t*) event);
 710             break;
 711     }
 712     FREE(event);
 713 }
 714
 715 /*
 716  * Dummy Callback. We only need this, so that the Prepare- and Check-Watchers
 717  * are triggered
 718  *
 719  */
 720 void xcb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 721 }
 722
 723 /*
 724  * We need to bind to the modifier per XKB. Sadly, XCB does not implement this
 725  *
 726  */
 727 void xkb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 728     XkbEvent ev;
 729     int modstate = 0;
 730
 731     DLOG("Got XKB-Event!\n");
 732
 733     while (XPending(xkb_dpy)) {
 734         XNextEvent(xkb_dpy, (XEvent*)&ev);
 735
 736         if (ev.type != xkb_event_base) {
 737             ELOG("No Xkb-Event!\n");
 738             continue;
 739         }
 740
 741         if (ev.any.xkb_type != XkbStateNotify) {
 742             ELOG("No State Notify!\n");
 743             continue;
 744         }
 745
 746         unsigned int mods = ev.state.mods;
 747         modstate = mods & Mod4Mask;
 748     }
 749
 750     if (modstate != mod_pressed) {
 751         if (modstate == 0) {
 752             DLOG("Mod4 got released!\n");
 753             hide_bars();
 754         } else {
 755             DLOG("Mod4 got pressed!\n");
 756             unhide_bars();
 757         }
 758         mod_pressed = modstate;
 759     }
 760 }
 761
 762 /*
 763  * Early initialization of the connection to X11: Everything which does not
 764  * depend on 'config'.
 765  *
 766  */
 767 char *init_xcb_early() {
 768     /* FIXME: xcb_connect leaks Memory */
 769     xcb_connection = xcb_connect(NULL, &screen);
 770     if (xcb_connection_has_error(xcb_connection)) {
 771         ELOG("Cannot open display\n");
 772         exit(EXIT_FAILURE);
 773     }
 774     DLOG("Connected to xcb\n");
 775
 776     /* We have to request the atoms we need */
 777     #define ATOM_DO(name) atom_cookies[name] = xcb_intern_atom(xcb_connection, 0, strlen(#name), #name);
 778     #include "xcb_atoms.def"
 779
 780     xcb_screen = xcb_setup_roots_iterator(xcb_get_setup(xcb_connection)).data;
 781     xcb_root = xcb_screen->root;
 782
 783     /* We draw the statusline to a seperate pixmap, because it looks the same on all bars and
 784      * this way, we can choose to crop it */
 785     uint32_t mask = XCB_GC_FOREGROUND;
 786     uint32_t vals[] = { colors.bar_bg, colors.bar_bg };
 787
 788     statusline_clear = xcb_generate_id(xcb_connection);
 789     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 790                                                                statusline_clear,
 791                                                                xcb_root,
 792                                                                mask,
 793                                                                vals);
 794
 795     mask |= XCB_GC_BACKGROUND;
 796     vals[0] = colors.bar_fg;
 797     statusline_ctx = xcb_generate_id(xcb_connection);
 798     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 799                                                             statusline_ctx,
 800                                                             xcb_root,
 801                                                             mask,
 802                                                             vals);
 803
 804     statusline_pm = xcb_generate_id(xcb_connection);
 805     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 806                                                                xcb_screen->root_depth,
 807                                                                statusline_pm,
 808                                                                xcb_root,
 809                                                                xcb_screen->width_in_pixels,
 810                                                                xcb_screen->height_in_pixels);
 811
 812
 813     /* The various Watchers to communicate with xcb */
 814     xcb_io = smalloc(sizeof(ev_io));
 815     xcb_prep = smalloc(sizeof(ev_prepare));
 816     xcb_chk = smalloc(sizeof(ev_check));
 817
 818     ev_io_init(xcb_io, &xcb_io_cb, xcb_get_file_descriptor(xcb_connection), EV_READ);
 819     ev_prepare_init(xcb_prep, &xcb_prep_cb);
 820     ev_check_init(xcb_chk, &xcb_chk_cb);
 821
 822     ev_io_start(main_loop, xcb_io);
 823     ev_prepare_start(main_loop, xcb_prep);
 824     ev_check_start(main_loop, xcb_chk);
 825
 826     /* Now we get the atoms and save them in a nice data structure */
 827     get_atoms();
 828
 829     xcb_get_property_cookie_t path_cookie;
 830     path_cookie = xcb_get_property_unchecked(xcb_connection,
 831                                    0,
 832                                    xcb_root,
 833                                    atoms[I3_SOCKET_PATH],
 834                                    XCB_GET_PROPERTY_TYPE_ANY,
 835                                    0, PATH_MAX);
 836
 837     /* We check, if i3 set its socket-path */
 838     xcb_get_property_reply_t *path_reply = xcb_get_property_reply(xcb_connection,
 839                                                                   path_cookie,
 840                                                                   NULL);
 841     char *path = NULL;
 842     if (path_reply) {
 843         int len = xcb_get_property_value_length(path_reply);
 844         if (len != 0) {
 845             path = strndup(xcb_get_property_value(path_reply), len);
 846         }
 847     }
 848
 849
 850     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
 851         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
 852         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
 853         exit(EXIT_FAILURE);
 854     }
 855
 856     return path;
 857 }
 858
 859 /*
 860  * Initialization which depends on 'config' being usable. Called after the
 861  * configuration has arrived.
 862  *
 863  */
 864 void init_xcb_late(char *fontname) {
 865     if (fontname == NULL) {
 866         /* XXX: font fallback to 'misc' like i3 does it would be good. */
 867         fontname = "-misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1";
 868     }
 869
 870     /* We load and allocate the font */
 871     xcb_font = xcb_generate_id(xcb_connection);
 872     xcb_void_cookie_t open_font_cookie;
 873     open_font_cookie = xcb_open_font_checked(xcb_connection,
 874                                              xcb_font,
 875                                              strlen(fontname),
 876                                              fontname);
 877
 878     /* We need to save info about the font, because we need the font's height and
 879      * information about the width of characters */
 880     xcb_query_font_cookie_t query_font_cookie;
 881     query_font_cookie = xcb_query_font(xcb_connection,
 882                                        xcb_font);
 883
 884     xcb_change_gc(xcb_connection,
 885                   statusline_ctx,
 886                   XCB_GC_FONT,
 887                   (uint32_t[]){ xcb_font });
 888
 889     xcb_flush(xcb_connection);
 890
 891     /* To grab modifiers without blocking other applications from receiving key-events
 892      * involving that modifier, we sadly have to use xkb which is not yet fully supported
 893      * in xcb */
 894     if (config.hide_on_modifier) {
 895         int xkb_major, xkb_minor, xkb_errbase, xkb_err;
 896         xkb_major = XkbMajorVersion;
 897         xkb_minor = XkbMinorVersion;
 898
 899         xkb_dpy = XkbOpenDisplay(NULL,
 900                                  &xkb_event_base,
 901                                  &xkb_errbase,
 902                                  &xkb_major,
 903                                  &xkb_minor,
 904                                  &xkb_err);
 905
 906         if (xkb_dpy == NULL) {
 907             ELOG("No XKB!\n");
 908             exit(EXIT_FAILURE);
 909         }
 910
 911         if (fcntl(ConnectionNumber(xkb_dpy), F_SETFD, FD_CLOEXEC) == -1) {
 912             ELOG("Could not set FD_CLOEXEC on xkbdpy: %s\n", strerror(errno));
 913             exit(EXIT_FAILURE);
 914         }
 915
 916         int i1;
 917         if (!XkbQueryExtension(xkb_dpy, &i1, &xkb_event_base, &xkb_errbase, &xkb_major, &xkb_minor)) {
 918             ELOG("XKB not supported by X-server!\n");
 919             exit(EXIT_FAILURE);
 920         }
 921
 922         if (!XkbSelectEvents(xkb_dpy, XkbUseCoreKbd, XkbStateNotifyMask, XkbStateNotifyMask)) {
 923             ELOG("Could not grab Key!\n");
 924             exit(EXIT_FAILURE);
 925         }
 926
 927         xkb_io = smalloc(sizeof(ev_io));
 928         ev_io_init(xkb_io, &xkb_io_cb, ConnectionNumber(xkb_dpy), EV_READ);
 929         ev_io_start(main_loop, xkb_io);
 930         XFlush(xkb_dpy);
 931     }
 932
 933     /* Now we save the font-infos */
 934     font_info = xcb_query_font_reply(xcb_connection,
 935                                      query_font_cookie,
 936                                      NULL);
 937
 938     if (xcb_request_failed(open_font_cookie, "Could not open font")) {
 939         exit(EXIT_FAILURE);
 940     }
 941
 942     font_height = font_info->font_ascent + font_info->font_descent;
 943
 944     if (xcb_query_font_char_infos_length(font_info) == 0) {
 945         font_table = NULL;
 946     } else {
 947         font_table = xcb_query_font_char_infos(font_info);
 948     }
 949
 950     DLOG("Calculated Font-height: %d\n", font_height);
 951 }
 952
 953 /*
 954  * Initializes tray support by requesting the appropriate _NET_SYSTEM_TRAY atom
 955  * for the X11 display we are running on, then acquiring the selection for this
 956  * atom. Afterwards, tray clients will send ClientMessages to our window.
 957  *
 958  */
 959 void init_tray() {
 960     DLOG("Initializing system tray functionality\n");
 961     /* request the tray manager atom for the X11 display we are running on */
 962     char atomname[strlen("_NET_SYSTEM_TRAY_S") + 11];
 963     snprintf(atomname, strlen("_NET_SYSTEM_TRAY_S") + 11, "_NET_SYSTEM_TRAY_S%d", screen);
 964     xcb_intern_atom_cookie_t tray_cookie;
 965     xcb_intern_atom_reply_t *tray_reply;
 966     tray_cookie = xcb_intern_atom(xcb_connection, 0, strlen(atomname), atomname);
 967
 968     /* tray support: we need a window to own the selection */
 969     xcb_window_t selwin = xcb_generate_id(xcb_connection);
 970     uint32_t selmask = XCB_CW_OVERRIDE_REDIRECT;
 971     uint32_t selval[] = { 1 };
 972     xcb_create_window(xcb_connection,
 973                       xcb_screen->root_depth,
 974                       selwin,
 975                       xcb_root,
 976                       -1, -1,
 977                       1, 1,
 978                       1,
 979                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
 980                       xcb_screen->root_visual,
 981                       selmask,
 982                       selval);
 983
 984     uint32_t orientation = _NET_SYSTEM_TRAY_ORIENTATION_HORZ;
 985     /* set the atoms */
 986     xcb_change_property(xcb_connection,
 987                         XCB_PROP_MODE_REPLACE,
 988                         selwin,
 989                         atoms[_NET_SYSTEM_TRAY_ORIENTATION],
 990                         XCB_ATOM_CARDINAL,
 991                         32,
 992                         1,
 993                         &orientation);
 994
 995     if (!(tray_reply = xcb_intern_atom_reply(xcb_connection, tray_cookie, NULL))) {
 996         ELOG("Could not get atom %s\n", atomname);
 997         exit(EXIT_FAILURE);
 998     }
 999
1000     xcb_set_selection_owner(xcb_connection,
1001                             selwin,
1002                             tray_reply->atom,
1003                             XCB_CURRENT_TIME);
1004
1005     /* Verify that we have the selection */
1006     xcb_get_selection_owner_cookie_t selcookie;
1007     xcb_get_selection_owner_reply_t *selreply;
1008
1009     selcookie = xcb_get_selection_owner(xcb_connection, tray_reply->atom);
1010     if (!(selreply = xcb_get_selection_owner_reply(xcb_connection, selcookie, NULL))) {
1011         ELOG("Could not get selection owner for %s\n", atomname);
1012         exit(EXIT_FAILURE);
1013     }
1014
1015     if (selreply->owner != selwin) {
1016         ELOG("Could not set the %s selection. " \
1017              "Maybe another tray is already running?\n", atomname);
1018         /* NOTE that this error is not fatal. We just can’t provide tray
1019          * functionality */
1020         free(selreply);
1021         return;
1022     }
1023
1024     /* Inform clients waiting for a new _NET_SYSTEM_TRAY that we are here */
1025     void *event = scalloc(32);
1026     xcb_client_message_event_t *ev = event;
1027     ev->response_type = XCB_CLIENT_MESSAGE;
1028     ev->window = xcb_root;
1029     ev->type = atoms[MANAGER];
1030     ev->format = 32;
1031     ev->data.data32[0] = XCB_CURRENT_TIME;
1032     ev->data.data32[1] = tray_reply->atom;
1033     ev->data.data32[2] = selwin;
1034     xcb_send_event(xcb_connection,
1035                    0,
1036                    xcb_root,
1037                    XCB_EVENT_MASK_STRUCTURE_NOTIFY,
1038                    (char*)ev);
1039     free(event);
1040     free(tray_reply);
1041 }
1042
1043 /*
1044  * Cleanup the xcb-stuff.
1045  * Called once, before the program terminates.
1046  *
1047  */
1048 void clean_xcb() {
1049     i3_output *o_walk;
1050     trayclient *trayclient;
1051     free_workspaces();
1052     SLIST_FOREACH(o_walk, outputs, slist) {
1053         TAILQ_FOREACH(trayclient, o_walk->trayclients, tailq) {
1054             /* Unmap, then reparent (to root) the tray client windows */
1055             xcb_unmap_window(xcb_connection, trayclient->win);
1056             xcb_reparent_window(xcb_connection,
1057                                 trayclient->win,
1058                                 xcb_root,
1059                                 0,
1060                                 0);
1061         }
1062         destroy_window(o_walk);
1063         FREE(o_walk->trayclients);
1064         FREE(o_walk->workspaces);
1065         FREE(o_walk->name);
1066     }
1067     FREE_SLIST(outputs, i3_output);
1068     FREE(outputs);
1069
1070     xcb_flush(xcb_connection);
1071     xcb_disconnect(xcb_connection);
1072
1073     ev_check_stop(main_loop, xcb_chk);
1074     ev_prepare_stop(main_loop, xcb_prep);
1075     ev_io_stop(main_loop, xcb_io);
1076
1077     FREE(xcb_chk);
1078     FREE(xcb_prep);
1079     FREE(xcb_io);
1080     FREE(font_info);
1081 }
1082
1083 /*
1084  * Get the earlier requested atoms and save them in the prepared data structure
1085  *
1086  */
1087 void get_atoms() {
1088     xcb_intern_atom_reply_t *reply;
1089     #define ATOM_DO(name) reply = xcb_intern_atom_reply(xcb_connection, atom_cookies[name], NULL); \
1090         if (reply == NULL) { \
1091             ELOG("Could not get atom %s\n", #name); \
1092             exit(EXIT_FAILURE); \
1093         } \
1094         atoms[name] = reply->atom; \
1095         free(reply);
1096
1097     #include "xcb_atoms.def"
1098     DLOG("Got Atoms\n");
1099 }
1100
1101 /*
1102  * Destroy the bar of the specified output
1103  *
1104  */
1105 void destroy_window(i3_output *output) {
1106     if (output == NULL) {
1107         return;
1108     }
1109     if (output->bar == XCB_NONE) {
1110         return;
1111     }
1112     xcb_destroy_window(xcb_connection, output->bar);
1113     output->bar = XCB_NONE;
1114 }
1115
1116 /*
1117  * Reallocate the statusline-buffer
1118  *
1119  */
1120 void realloc_sl_buffer() {
1121     DLOG("Re-allocating statusline-buffer, statusline_width = %d, xcb_screen->width_in_pixels = %d\n",
1122          statusline_width, xcb_screen->width_in_pixels);
1123     xcb_free_pixmap(xcb_connection, statusline_pm);
1124     statusline_pm = xcb_generate_id(xcb_connection);
1125     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1126                                                                xcb_screen->root_depth,
1127                                                                statusline_pm,
1128                                                                xcb_root,
1129                                                                MAX(xcb_screen->width_in_pixels, statusline_width),
1130                                                                xcb_screen->height_in_pixels);
1131
1132     uint32_t mask = XCB_GC_FOREGROUND;
1133     uint32_t vals[3] = { colors.bar_bg, colors.bar_bg, xcb_font };
1134     xcb_free_gc(xcb_connection, statusline_clear);
1135     statusline_clear = xcb_generate_id(xcb_connection);
1136     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
1137                                                                statusline_clear,
1138                                                                xcb_root,
1139                                                                mask,
1140                                                                vals);
1141
1142     mask |= XCB_GC_BACKGROUND | XCB_GC_FONT;
1143     vals[0] = colors.bar_fg;
1144     statusline_ctx = xcb_generate_id(xcb_connection);
1145     xcb_free_gc(xcb_connection, statusline_ctx);
1146     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
1147                                                             statusline_ctx,
1148                                                             xcb_root,
1149                                                             mask,
1150                                                             vals);
1151
1152     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
1153         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
1154         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
1155         exit(EXIT_FAILURE);
1156     }
1157
1158 }
1159
1160 /*
1161  * Reconfigure all bars and create new bars for recently activated outputs
1162  *
1163  */
1164 void reconfig_windows() {
1165     uint32_t mask;
1166     uint32_t values[5];
1167     static bool tray_configured = false;
1168
1169     i3_output *walk;
1170     SLIST_FOREACH(walk, outputs, slist) {
1171         if (!walk->active) {
1172             /* If an output is not active, we destroy its bar */
1173             /* FIXME: Maybe we rather want to unmap? */
1174             DLOG("Destroying window for output %s\n", walk->name);
1175             destroy_window(walk);
1176             continue;
1177         }
1178         if (walk->bar == XCB_NONE) {
1179             DLOG("Creating Window for output %s\n", walk->name);
1180
1181             walk->bar = xcb_generate_id(xcb_connection);
1182             walk->buffer = xcb_generate_id(xcb_connection);
1183             mask = XCB_CW_BACK_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
1184             /* Black background */
1185             values[0] = colors.bar_bg;
1186             /* If hide_on_modifier is set, i3 is not supposed to manage our bar-windows */
1187             values[1] = config.hide_on_modifier;
1188             /* We enable the following EventMask fields:
1189              * EXPOSURE, to get expose events (we have to re-draw then)
1190              * SUBSTRUCTURE_REDIRECT, to get ConfigureRequests when the tray
1191              *                        child windows use ConfigureWindow
1192              * BUTTON_PRESS, to handle clicks on the workspace buttons
1193              * */
1194             values[2] = XCB_EVENT_MASK_EXPOSURE |
1195                         XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT;
1196             if (!config.disable_ws) {
1197                 values[2] |= XCB_EVENT_MASK_BUTTON_PRESS;
1198             }
1199             xcb_void_cookie_t win_cookie = xcb_create_window_checked(xcb_connection,
1200                                                                      xcb_screen->root_depth,
1201                                                                      walk->bar,
1202                                                                      xcb_root,
1203                                                                      walk->rect.x, walk->rect.y + walk->rect.h - font_height - 6,
1204                                                                      walk->rect.w, font_height + 6,
1205                                                                      1,
1206                                                                      XCB_WINDOW_CLASS_INPUT_OUTPUT,
1207                                                                      xcb_screen->root_visual,
1208                                                                      mask,
1209                                                                      values);
1210
1211             /* The double-buffer we use to render stuff off-screen */
1212             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1213                                                                     xcb_screen->root_depth,
1214                                                                     walk->buffer,
1215                                                                     walk->bar,
1216                                                                     walk->rect.w,
1217                                                                     walk->rect.h);
1218
1219             /* Set the WM_CLASS and WM_NAME (we don't need UTF-8) atoms */
1220             xcb_void_cookie_t class_cookie;
1221             class_cookie = xcb_change_property(xcb_connection,
1222                                                XCB_PROP_MODE_REPLACE,
1223                                                walk->bar,
1224                                                XCB_ATOM_WM_CLASS,
1225                                                XCB_ATOM_STRING,
1226                                                8,
1227                                                (strlen("i3bar") + 1) * 2,
1228                                                "i3bar\0i3bar\0");
1229
1230             char *name;
1231             if (asprintf(&name, "i3bar for output %s", walk->name) == -1)
1232                 err(EXIT_FAILURE, "asprintf()");
1233             xcb_void_cookie_t name_cookie;
1234             name_cookie = xcb_change_property(xcb_connection,
1235                                               XCB_PROP_MODE_REPLACE,
1236                                               walk->bar,
1237                                               XCB_ATOM_WM_NAME,
1238                                               XCB_ATOM_STRING,
1239                                               8,
1240                                               strlen(name),
1241                                               name);
1242             free(name);
1243
1244             /* We want dock-windows (for now). When override_redirect is set, i3 is ignoring
1245              * this one */
1246             xcb_void_cookie_t dock_cookie = xcb_change_property(xcb_connection,
1247                                                                 XCB_PROP_MODE_REPLACE,
1248                                                                 walk->bar,
1249                                                                 atoms[_NET_WM_WINDOW_TYPE],
1250                                                                 XCB_ATOM_ATOM,
1251                                                                 32,
1252                                                                 1,
1253                                                                 (unsigned char*) &atoms[_NET_WM_WINDOW_TYPE_DOCK]);
1254
1255             /* We need to tell i3, where to reserve space for i3bar */
1256             /* left, right, top, bottom, left_start_y, left_end_y,
1257              * right_start_y, right_end_y, top_start_x, top_end_x, bottom_start_x,
1258              * bottom_end_x */
1259             /* A local struct to save the strut_partial property */
1260             struct {
1261                 uint32_t left;
1262                 uint32_t right;
1263                 uint32_t top;
1264                 uint32_t bottom;
1265                 uint32_t left_start_y;
1266                 uint32_t left_end_y;
1267                 uint32_t right_start_y;
1268                 uint32_t right_end_y;
1269                 uint32_t top_start_x;
1270                 uint32_t top_end_x;
1271                 uint32_t bottom_start_x;
1272                 uint32_t bottom_end_x;
1273             } __attribute__((__packed__)) strut_partial = {0,};
1274             switch (config.position) {
1275                 case POS_NONE:
1276                     break;
1277                 case POS_TOP:
1278                     strut_partial.top = font_height + 6;
1279                     strut_partial.top_start_x = walk->rect.x;
1280                     strut_partial.top_end_x = walk->rect.x + walk->rect.w;
1281                     break;
1282                 case POS_BOT:
1283                     strut_partial.bottom = font_height + 6;
1284                     strut_partial.bottom_start_x = walk->rect.x;
1285                     strut_partial.bottom_end_x = walk->rect.x + walk->rect.w;
1286                     break;
1287             }
1288             xcb_void_cookie_t strut_cookie = xcb_change_property(xcb_connection,
1289                                                                  XCB_PROP_MODE_REPLACE,
1290                                                                  walk->bar,
1291                                                                  atoms[_NET_WM_STRUT_PARTIAL],
1292                                                                  XCB_ATOM_CARDINAL,
1293                                                                  32,
1294                                                                  12,
1295                                                                  &strut_partial);
1296
1297             /* We also want a graphics-context for the bars (it defines the properties
1298              * with which we draw to them) */
1299             walk->bargc = xcb_generate_id(xcb_connection);
1300             mask = XCB_GC_FONT;
1301             values[0] = xcb_font;
1302             xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection,
1303                                                                 walk->bargc,
1304                                                                 walk->bar,
1305                                                                 mask,
1306                                                                 values);
1307
1308             /* We finally map the bar (display it on screen), unless the modifier-switch is on */
1309             xcb_void_cookie_t map_cookie;
1310             if (!config.hide_on_modifier) {
1311                 map_cookie = xcb_map_window_checked(xcb_connection, walk->bar);
1312             }
1313
1314             if (xcb_request_failed(win_cookie,   "Could not create window") ||
1315                 xcb_request_failed(pm_cookie,    "Could not create pixmap") ||
1316                 xcb_request_failed(dock_cookie,  "Could not set dock mode") ||
1317                 xcb_request_failed(class_cookie, "Could not set WM_CLASS")  ||
1318                 xcb_request_failed(name_cookie,  "Could not set WM_NAME")   ||
1319                 xcb_request_failed(strut_cookie, "Could not set strut")     ||
1320                 xcb_request_failed(gc_cookie,    "Could not create graphical context") ||
1321                 (!config.hide_on_modifier && xcb_request_failed(map_cookie, "Could not map window"))) {
1322                 exit(EXIT_FAILURE);
1323             }
1324
1325             if (!tray_configured &&
1326                 (!config.tray_output ||
1327                  strcasecmp("none", config.tray_output) != 0)) {
1328                 init_tray();
1329                 tray_configured = true;
1330             }
1331         } else {
1332             /* We already have a bar, so we just reconfigure it */
1333             mask = XCB_CONFIG_WINDOW_X |
1334                    XCB_CONFIG_WINDOW_Y |
1335                    XCB_CONFIG_WINDOW_WIDTH |
1336                    XCB_CONFIG_WINDOW_HEIGHT |
1337                    XCB_CONFIG_WINDOW_STACK_MODE;
1338             values[0] = walk->rect.x;
1339             values[1] = walk->rect.y + walk->rect.h - font_height - 6;
1340             values[2] = walk->rect.w;
1341             values[3] = font_height + 6;
1342             values[4] = XCB_STACK_MODE_ABOVE;
1343
1344             DLOG("Destroying buffer for output %s", walk->name);
1345             xcb_free_pixmap(xcb_connection, walk->buffer);
1346
1347             DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
1348             xcb_void_cookie_t cfg_cookie = xcb_configure_window_checked(xcb_connection,
1349                                                                         walk->bar,
1350                                                                         mask,
1351                                                                         values);
1352
1353             DLOG("Recreating buffer for output %s", walk->name);
1354             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1355                                                                     xcb_screen->root_depth,
1356                                                                     walk->buffer,
1357                                                                     walk->bar,
1358                                                                     walk->rect.w,
1359                                                                     walk->rect.h);
1360
1361             if (xcb_request_failed(cfg_cookie, "Could not reconfigure window")) {
1362                 exit(EXIT_FAILURE);
1363             }
1364             if (xcb_request_failed(pm_cookie,  "Could not create pixmap")) {
1365                 exit(EXIT_FAILURE);
1366             }
1367         }
1368     }
1369 }
1370
1371 /*
1372  * Render the bars, with buttons and statusline
1373  *
1374  */
1375 void draw_bars() {
1376     DLOG("Drawing Bars...\n");
1377     int i = 0;
1378
1379     refresh_statusline();
1380
1381     i3_output *outputs_walk;
1382     SLIST_FOREACH(outputs_walk, outputs, slist) {
1383         if (!outputs_walk->active) {
1384             DLOG("Output %s inactive, skipping...\n", outputs_walk->name);
1385             continue;
1386         }
1387         if (outputs_walk->bar == XCB_NONE) {
1388             /* Oh shit, an active output without an own bar. Create it now! */
1389             reconfig_windows();
1390         }
1391         /* First things first: clear the backbuffer */
1392         uint32_t color = colors.bar_bg;
1393         xcb_change_gc(xcb_connection,
1394                       outputs_walk->bargc,
1395                       XCB_GC_FOREGROUND,
1396                       &color);
1397         xcb_rectangle_t rect = { 0, 0, outputs_walk->rect.w, font_height + 6 };
1398         xcb_poly_fill_rectangle(xcb_connection,
1399                                 outputs_walk->buffer,
1400                                 outputs_walk->bargc,
1401                                 1,
1402                                 &rect);
1403
1404         if (statusline != NULL) {
1405             DLOG("Printing statusline!\n");
1406
1407             /* Luckily we already prepared a seperate pixmap containing the rendered
1408              * statusline, we just have to copy the relevant parts to the relevant
1409              * position */
1410             trayclient *trayclient;
1411             int traypx = 0;
1412             TAILQ_FOREACH(trayclient, outputs_walk->trayclients, tailq) {
1413                 if (!trayclient->mapped)
1414                     continue;
1415                 /* We assume the tray icons are quadratic (we use the font
1416                  * *height* as *width* of the icons) because we configured them
1417                  * like this. */
1418                 traypx += font_height + 2;
1419             }
1420             /* Add 2px of padding if there are any tray icons */
1421             if (traypx > 0)
1422                 traypx += 2;
1423             xcb_copy_area(xcb_connection,
1424                           statusline_pm,
1425                           outputs_walk->buffer,
1426                           outputs_walk->bargc,
1427                           MAX(0, (int16_t)(statusline_width - outputs_walk->rect.w + 4)), 0,
1428                           MAX(0, (int16_t)(outputs_walk->rect.w - statusline_width - traypx - 4)), 3,
1429                           MIN(outputs_walk->rect.w - traypx - 4, statusline_width), font_height);
1430         }
1431
1432         if (config.disable_ws) {
1433             continue;
1434         }
1435
1436         i3_ws *ws_walk;
1437         TAILQ_FOREACH(ws_walk, outputs_walk->workspaces, tailq) {
1438             DLOG("Drawing Button for WS %s at x = %d\n", ws_walk->name, i);
1439             uint32_t fg_color = colors.inactive_ws_fg;
1440             uint32_t bg_color = colors.inactive_ws_bg;
1441             if (ws_walk->visible) {
1442                 if (!ws_walk->focused) {
1443                     fg_color = colors.active_ws_fg;
1444                     bg_color = colors.active_ws_bg;
1445                 } else {
1446                     fg_color = colors.focus_ws_fg;
1447                     bg_color = colors.focus_ws_bg;
1448                 }
1449             }
1450             if (ws_walk->urgent) {
1451                 DLOG("WS %s is urgent!\n", ws_walk->name);
1452                 fg_color = colors.urgent_ws_fg;
1453                 bg_color = colors.urgent_ws_bg;
1454                 /* The urgent-hint should get noticed, so we unhide the bars shortly */
1455                 unhide_bars();
1456             }
1457             uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND;
1458             uint32_t vals[] = { bg_color, bg_color };
1459             xcb_change_gc(xcb_connection,
1460                           outputs_walk->bargc,
1461                           mask,
1462                           vals);
1463             xcb_rectangle_t rect = { i + 1, 1, ws_walk->name_width + 8, font_height + 4 };
1464             xcb_poly_fill_rectangle(xcb_connection,
1465                                     outputs_walk->buffer,
1466                                     outputs_walk->bargc,
1467                                     1,
1468                                     &rect);
1469             xcb_change_gc(xcb_connection,
1470                           outputs_walk->bargc,
1471                           XCB_GC_FOREGROUND,
1472                           &fg_color);
1473             xcb_image_text_16(xcb_connection,
1474                               ws_walk->name_glyphs,
1475                               outputs_walk->buffer,
1476                               outputs_walk->bargc,
1477                               i + 5, font_info->font_ascent + 2,
1478                               ws_walk->ucs2_name);
1479             i += 10 + ws_walk->name_width;
1480         }
1481
1482         i = 0;
1483     }
1484
1485     redraw_bars();
1486 }
1487
1488 /*
1489  * Redraw the bars, i.e. simply copy the buffer to the barwindow
1490  *
1491  */
1492 void redraw_bars() {
1493     i3_output *outputs_walk;
1494     SLIST_FOREACH(outputs_walk, outputs, slist) {
1495         if (!outputs_walk->active) {
1496             continue;
1497         }
1498         xcb_copy_area(xcb_connection,
1499                       outputs_walk->buffer,
1500                       outputs_walk->bar,
1501                       outputs_walk->bargc,
1502                       0, 0,
1503                       0, 0,
1504                       outputs_walk->rect.w,
1505                       outputs_walk->rect.h);
1506         xcb_flush(xcb_connection);
1507     }
1508 }