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 #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
  34 #include "common.h"
  35 #include "libi3.h"
  36
  37 /* We save the Atoms in an easy to access array, indexed by an enum */
  38 enum {
  39     #define ATOM_DO(name) name,
  40     #include "xcb_atoms.def"
  41     NUM_ATOMS
  42 };
  43
  44 xcb_intern_atom_cookie_t atom_cookies[NUM_ATOMS];
  45 xcb_atom_t               atoms[NUM_ATOMS];
  46
  47 /* Variables, that are the same for all functions at all times */
  48 xcb_connection_t *xcb_connection;
  49 int              screen;
  50 xcb_screen_t     *xcb_screen;
  51 xcb_window_t     xcb_root;
  52 xcb_font_t       xcb_font;
  53
  54 /* We need to cache some data to speed up text-width-prediction */
  55 xcb_query_font_reply_t *font_info;
  56 int                    font_height;
  57 xcb_charinfo_t         *font_table;
  58
  59 /* These are only relevant for XKB, which we only need for grabbing modifiers */
  60 Display          *xkb_dpy;
  61 int              xkb_event_base;
  62 int              mod_pressed = 0;
  63
  64 /* Because the statusline is the same on all outputs, we have
  65  * global buffer to render it on */
  66 xcb_gcontext_t   statusline_ctx;
  67 xcb_gcontext_t   statusline_clear;
  68 xcb_pixmap_t     statusline_pm;
  69 uint32_t         statusline_width;
  70
  71 /* Event-Watchers, to interact with the user */
  72 ev_prepare *xcb_prep;
  73 ev_check   *xcb_chk;
  74 ev_io      *xcb_io;
  75 ev_io      *xkb_io;
  76
  77 /* The parsed colors */
  78 struct xcb_colors_t {
  79     uint32_t bar_fg;
  80     uint32_t bar_bg;
  81     uint32_t active_ws_fg;
  82     uint32_t active_ws_bg;
  83     uint32_t inactive_ws_fg;
  84     uint32_t inactive_ws_bg;
  85     uint32_t urgent_ws_bg;
  86     uint32_t urgent_ws_fg;
  87     uint32_t focus_ws_bg;
  88     uint32_t focus_ws_fg;
  89 };
  90 struct xcb_colors_t colors;
  91
  92 /* We define xcb_request_failed as a macro to include the relevant line-number */
  93 #define xcb_request_failed(cookie, err_msg) _xcb_request_failed(cookie, err_msg, __LINE__)
  94 int _xcb_request_failed(xcb_void_cookie_t cookie, char *err_msg, int line) {
  95     xcb_generic_error_t *err;
  96     if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
  97         fprintf(stderr, "[%s:%d] ERROR: %s. X Error Code: %d\n", __FILE__, line, err_msg, err->error_code);
  98         return err->error_code;
  99     }
 100     return 0;
 101 }
 102
 103 /*
 104  * Predicts the length of text based on cached data.
 105  * The string has to be encoded in ucs2 and glyph_len has to be the length
 106  * of the string (in glyphs).
 107  *
 108  */
 109 uint32_t predict_text_extents(xcb_char2b_t *text, uint32_t length) {
 110     /* If we don't have per-character data, return the maximum width */
 111     if (font_table == NULL) {
 112         return (font_info->max_bounds.character_width * length);
 113     }
 114
 115     uint32_t width = 0;
 116     uint32_t i;
 117
 118     for (i = 0; i < length; i++) {
 119         xcb_charinfo_t *info;
 120         int row = text[i].byte1;
 121         int col = text[i].byte2;
 122
 123         if (row < font_info->min_byte1 || row > font_info->max_byte1 ||
 124             col < font_info->min_char_or_byte2 || col > font_info->max_char_or_byte2) {
 125             continue;
 126         }
 127
 128         /* Don't you ask me, how this one works… */
 129         info = &font_table[((row - font_info->min_byte1) *
 130                             (font_info->max_char_or_byte2 - font_info->min_char_or_byte2 + 1)) +
 131                            (col - font_info->min_char_or_byte2)];
 132
 133         if (info->character_width != 0 ||
 134             (info->right_side_bearing |
 135              info->left_side_bearing |
 136              info->ascent |
 137              info->descent) != 0) {
 138             width += info->character_width;
 139         }
 140     }
 141
 142     return width;
 143 }
 144
 145 /*
 146  * Draws text given in UCS-2-encoding to a given drawable and position
 147  *
 148  */
 149 void draw_text(xcb_drawable_t drawable, xcb_gcontext_t ctx, int16_t x, int16_t y,
 150                xcb_char2b_t *text, uint32_t glyph_count) {
 151     int offset = 0;
 152     int16_t pos_x = x;
 153     int16_t font_ascent = font_info->font_ascent;
 154
 155     while (glyph_count > 0) {
 156         uint8_t chunk_size = MIN(255, glyph_count);
 157         uint32_t chunk_width = predict_text_extents(text + offset, chunk_size);
 158
 159         xcb_image_text_16(xcb_connection,
 160                           chunk_size,
 161                           drawable,
 162                           ctx,
 163                           pos_x, y + font_ascent,
 164                           text + offset);
 165
 166         offset += chunk_size;
 167         pos_x += chunk_width;
 168         glyph_count -= chunk_size;
 169     }
 170 }
 171
 172 /*
 173  * Redraws the statusline to the buffer
 174  *
 175  */
 176 void refresh_statusline() {
 177     int glyph_count;
 178
 179     if (statusline == NULL) {
 180         return;
 181     }
 182
 183     xcb_char2b_t *text = (xcb_char2b_t*) convert_utf8_to_ucs2(statusline, &glyph_count);
 184     uint32_t old_statusline_width = statusline_width;
 185     statusline_width = predict_text_extents(text, glyph_count);
 186     /* If the statusline is bigger than our screen we need to make sure that
 187      * the pixmap provides enough space, so re-allocate if the width grew */
 188     if (statusline_width > xcb_screen->width_in_pixels &&
 189         statusline_width > old_statusline_width)
 190         realloc_sl_buffer();
 191
 192     xcb_rectangle_t rect = { 0, 0, xcb_screen->width_in_pixels, font_height };
 193     xcb_poly_fill_rectangle(xcb_connection, statusline_pm, statusline_clear, 1, &rect);
 194     draw_text(statusline_pm, statusline_ctx, 0, 0, text, glyph_count);
 195
 196     FREE(text);
 197 }
 198
 199 /*
 200  * Hides all bars (unmaps them)
 201  *
 202  */
 203 void hide_bars() {
 204     if (!config.hide_on_modifier) {
 205         return;
 206     }
 207
 208     i3_output *walk;
 209     SLIST_FOREACH(walk, outputs, slist) {
 210         if (!walk->active) {
 211             continue;
 212         }
 213         xcb_unmap_window(xcb_connection, walk->bar);
 214     }
 215     stop_child();
 216 }
 217
 218 /*
 219  * Unhides all bars (maps them)
 220  *
 221  */
 222 void unhide_bars() {
 223     if (!config.hide_on_modifier) {
 224         return;
 225     }
 226
 227     i3_output           *walk;
 228     xcb_void_cookie_t   cookie;
 229     uint32_t            mask;
 230     uint32_t            values[5];
 231
 232     cont_child();
 233
 234     SLIST_FOREACH(walk, outputs, slist) {
 235         if (walk->bar == XCB_NONE) {
 236             continue;
 237         }
 238         mask = XCB_CONFIG_WINDOW_X |
 239                XCB_CONFIG_WINDOW_Y |
 240                XCB_CONFIG_WINDOW_WIDTH |
 241                XCB_CONFIG_WINDOW_HEIGHT |
 242                XCB_CONFIG_WINDOW_STACK_MODE;
 243         values[0] = walk->rect.x;
 244         if (config.position == POS_TOP)
 245             values[1] = walk->rect.y;
 246         else values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 247         values[2] = walk->rect.w;
 248         values[3] = font_height + 6;
 249         values[4] = XCB_STACK_MODE_ABOVE;
 250         DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 251         cookie = xcb_configure_window_checked(xcb_connection,
 252                                               walk->bar,
 253                                               mask,
 254                                               values);
 255
 256         if (xcb_request_failed(cookie, "Could not reconfigure window")) {
 257             exit(EXIT_FAILURE);
 258         }
 259         xcb_map_window(xcb_connection, walk->bar);
 260     }
 261 }
 262
 263 /*
 264  * Parse the colors into a format that we can use
 265  *
 266  */
 267 void init_colors(const struct xcb_color_strings_t *new_colors) {
 268 #define PARSE_COLOR(name, def) \
 269     do { \
 270         colors.name = get_colorpixel(new_colors->name ? new_colors->name : def); \
 271     } while  (0)
 272     PARSE_COLOR(bar_fg, "#FFFFFF");
 273     PARSE_COLOR(bar_bg, "#000000");
 274     PARSE_COLOR(active_ws_fg, "#FFFFFF");
 275     PARSE_COLOR(active_ws_bg, "#333333");
 276     PARSE_COLOR(inactive_ws_fg, "#888888");
 277     PARSE_COLOR(inactive_ws_bg, "#222222");
 278     PARSE_COLOR(urgent_ws_fg, "#FFFFFF");
 279     PARSE_COLOR(urgent_ws_bg, "#900000");
 280     PARSE_COLOR(focus_ws_fg, "#FFFFFF");
 281     PARSE_COLOR(focus_ws_bg, "#285577");
 282 #undef PARSE_COLOR
 283 }
 284
 285 /*
 286  * Handle a button-press-event (i.e. a mouse click on one of our bars).
 287  * We determine, whether the click occured on a ws-button or if the scroll-
 288  * wheel was used and change the workspace appropriately
 289  *
 290  */
 291 void handle_button(xcb_button_press_event_t *event) {
 292     i3_ws *cur_ws;
 293
 294     /* Determine, which bar was clicked */
 295     i3_output *walk;
 296     xcb_window_t bar = event->event;
 297     SLIST_FOREACH(walk, outputs, slist) {
 298         if (walk->bar == bar) {
 299             break;
 300         }
 301     }
 302
 303     if (walk == NULL) {
 304         DLOG("Unknown Bar klicked!\n");
 305         return;
 306     }
 307
 308     /* TODO: Move this to extern get_ws_for_output() */
 309     TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 310         if (cur_ws->visible) {
 311             break;
 312         }
 313     }
 314
 315     if (cur_ws == NULL) {
 316         DLOG("No Workspace active?\n");
 317         return;
 318     }
 319
 320     int32_t x = event->event_x;
 321
 322     DLOG("Got Button %d\n", event->detail);
 323
 324     switch (event->detail) {
 325         case 1:
 326             /* Left Mousbutton. We determine, which button was clicked
 327              * and set cur_ws accordingly */
 328             TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 329                 DLOG("x = %d\n", x);
 330                 if (x < cur_ws->name_width + 10) {
 331                     break;
 332                 }
 333                 x -= cur_ws->name_width + 10;
 334             }
 335             if (cur_ws == NULL) {
 336                 return;
 337             }
 338             break;
 339         case 4:
 340             /* Mouse wheel down. We select the next ws */
 341             if (cur_ws == TAILQ_FIRST(walk->workspaces)) {
 342                 cur_ws = TAILQ_LAST(walk->workspaces, ws_head);
 343             } else {
 344                 cur_ws = TAILQ_PREV(cur_ws, ws_head, tailq);
 345             }
 346             break;
 347         case 5:
 348             /* Mouse wheel up. We select the previos ws */
 349             if (cur_ws == TAILQ_LAST(walk->workspaces, ws_head)) {
 350                 cur_ws = TAILQ_FIRST(walk->workspaces);
 351             } else {
 352                 cur_ws = TAILQ_NEXT(cur_ws, tailq);
 353             }
 354             break;
 355     }
 356
 357     const size_t len = strlen(cur_ws->name) + strlen("workspace \"\"") + 1;
 358     char buffer[len];
 359     snprintf(buffer, len, "workspace \"%s\"", cur_ws->name);
 360     i3_send_msg(I3_IPC_MESSAGE_TYPE_COMMAND, buffer);
 361 }
 362
 363 /*
 364  * Configures the x coordinate of all trayclients. To be called after adding a
 365  * new tray client or removing an old one.
 366  *
 367  */
 368 static void configure_trayclients() {
 369     trayclient *trayclient;
 370     i3_output *output;
 371     SLIST_FOREACH(output, outputs, slist) {
 372         if (!output->active)
 373             continue;
 374
 375         int clients = 0;
 376         TAILQ_FOREACH_REVERSE(trayclient, output->trayclients, tc_head, tailq) {
 377             if (!trayclient->mapped)
 378                 continue;
 379             clients++;
 380
 381             DLOG("Configuring tray window %08x to x=%d\n",
 382                  trayclient->win, output->rect.w - (clients * (font_height + 2)));
 383             uint32_t x = output->rect.w - (clients * (font_height + 2));
 384             xcb_configure_window(xcb_connection,
 385                                  trayclient->win,
 386                                  XCB_CONFIG_WINDOW_X,
 387                                  &x);
 388         }
 389     }
 390 }
 391
 392 /*
 393  * Handles ClientMessages (messages sent from another client directly to us).
 394  *
 395  * At the moment, only the tray window will receive client messages. All
 396  * supported client messages currently are _NET_SYSTEM_TRAY_OPCODE.
 397  *
 398  */
 399 static void handle_client_message(xcb_client_message_event_t* event) {
 400     if (event->type == atoms[_NET_SYSTEM_TRAY_OPCODE] &&
 401         event->format == 32) {
 402         DLOG("_NET_SYSTEM_TRAY_OPCODE received\n");
 403         /* event->data.data32[0] is the timestamp */
 404         uint32_t op = event->data.data32[1];
 405         uint32_t mask;
 406         uint32_t values[2];
 407         if (op == SYSTEM_TRAY_REQUEST_DOCK) {
 408             xcb_window_t client = event->data.data32[2];
 409
 410             /* Listen for PropertyNotify events to get the most recent value of
 411              * the XEMBED_MAPPED atom, also listen for UnmapNotify events */
 412             mask = XCB_CW_EVENT_MASK;
 413             values[0] = XCB_EVENT_MASK_PROPERTY_CHANGE |
 414                         XCB_EVENT_MASK_STRUCTURE_NOTIFY;
 415             xcb_change_window_attributes(xcb_connection,
 416                                          client,
 417                                          mask,
 418                                          values);
 419
 420             /* Request the _XEMBED_INFO property. The XEMBED specification
 421              * (which is referred by the tray specification) says this *has* to
 422              * be set, but VLC does not set it… */
 423             bool map_it = true;
 424             int xe_version = 1;
 425             xcb_get_property_cookie_t xembedc;
 426             xembedc = xcb_get_property_unchecked(xcb_connection,
 427                                                  0,
 428                                                  client,
 429                                                  atoms[_XEMBED_INFO],
 430                                                  XCB_GET_PROPERTY_TYPE_ANY,
 431                                                  0,
 432                                                  2 * 32);
 433
 434             xcb_get_property_reply_t *xembedr = xcb_get_property_reply(xcb_connection,
 435                                                                        xembedc,
 436                                                                        NULL);
 437             if (xembedr != NULL && xembedr->length != 0) {
 438                 DLOG("xembed format = %d, len = %d\n", xembedr->format, xembedr->length);
 439                 uint32_t *xembed = xcb_get_property_value(xembedr);
 440                 DLOG("xembed version = %d\n", xembed[0]);
 441                 DLOG("xembed flags = %d\n", xembed[1]);
 442                 map_it = ((xembed[1] & XEMBED_MAPPED) == XEMBED_MAPPED);
 443                 xe_version = xembed[0];
 444                 if (xe_version > 1)
 445                     xe_version = 1;
 446                 free(xembedr);
 447             } else {
 448                 ELOG("Window %08x violates the XEMBED protocol, _XEMBED_INFO not set\n", client);
 449             }
 450
 451             DLOG("X window %08x requested docking\n", client);
 452             i3_output *walk, *output = NULL;
 453             SLIST_FOREACH(walk, outputs, slist) {
 454                 if (!walk->active)
 455                     continue;
 456                 if (config.tray_output &&
 457                     strcasecmp(walk->name, config.tray_output) != 0)
 458                     continue;
 459                 DLOG("using output %s\n", walk->name);
 460                 output = walk;
 461             }
 462             if (output == NULL) {
 463                 ELOG("No output found\n");
 464                 return;
 465             }
 466             xcb_reparent_window(xcb_connection,
 467                                 client,
 468                                 output->bar,
 469                                 output->rect.w - font_height - 2,
 470                                 2);
 471             /* We reconfigure the window to use a reasonable size. The systray
 472              * specification explicitly says:
 473              *   Tray icons may be assigned any size by the system tray, and
 474              *   should do their best to cope with any size effectively
 475              */
 476             mask = XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
 477             values[0] = font_height;
 478             values[1] = font_height;
 479             xcb_configure_window(xcb_connection,
 480                                  client,
 481                                  mask,
 482                                  values);
 483
 484             /* send the XEMBED_EMBEDDED_NOTIFY message */
 485             void *event = scalloc(32);
 486             xcb_client_message_event_t *ev = event;
 487             ev->response_type = XCB_CLIENT_MESSAGE;
 488             ev->window = client;
 489             ev->type = atoms[_XEMBED];
 490             ev->format = 32;
 491             ev->data.data32[0] = XCB_CURRENT_TIME;
 492             ev->data.data32[1] = atoms[XEMBED_EMBEDDED_NOTIFY];
 493             ev->data.data32[2] = output->bar;
 494             ev->data.data32[3] = xe_version;
 495             xcb_send_event(xcb_connection,
 496                            0,
 497                            client,
 498                            XCB_EVENT_MASK_NO_EVENT,
 499                            (char*)ev);
 500             free(event);
 501
 502             /* Put the client inside the save set. Upon termination (whether
 503              * killed or normal exit does not matter) of i3bar, these clients
 504              * will be correctly reparented to their most closest living
 505              * ancestor. Without this, tray icons might die when i3bar
 506              * exits/crashes. */
 507             xcb_change_save_set(xcb_connection, XCB_SET_MODE_INSERT, client);
 508
 509             if (map_it) {
 510                 DLOG("Mapping dock client\n");
 511                 xcb_map_window(xcb_connection, client);
 512             } else {
 513                 DLOG("Not mapping dock client yet\n");
 514             }
 515             trayclient *tc = smalloc(sizeof(trayclient));
 516             tc->win = client;
 517             tc->mapped = map_it;
 518             tc->xe_version = xe_version;
 519             TAILQ_INSERT_TAIL(output->trayclients, tc, tailq);
 520
 521             /* Trigger an update to copy the statusline text to the appropriate
 522              * position */
 523             configure_trayclients();
 524             draw_bars();
 525         }
 526     }
 527 }
 528
 529 /*
 530  * Handles UnmapNotify events. These events happen when a tray window unmaps
 531  * itself. We then update our data structure
 532  *
 533  */
 534 static void handle_unmap_notify(xcb_unmap_notify_event_t* event) {
 535     DLOG("UnmapNotify for window = %08x, event = %08x\n", event->window, event->event);
 536
 537     i3_output *walk;
 538     SLIST_FOREACH(walk, outputs, slist) {
 539         if (!walk->active)
 540             continue;
 541         DLOG("checking output %s\n", walk->name);
 542         trayclient *trayclient;
 543         TAILQ_FOREACH(trayclient, walk->trayclients, tailq) {
 544             if (trayclient->win != event->window)
 545                 continue;
 546
 547             DLOG("Removing tray client with window ID %08x\n", event->window);
 548             TAILQ_REMOVE(walk->trayclients, trayclient, tailq);
 549
 550             /* Trigger an update, we now have more space for the statusline */
 551             configure_trayclients();
 552             draw_bars();
 553             return;
 554         }
 555     }
 556 }
 557
 558 /*
 559  * Handle PropertyNotify messages. Currently only the _XEMBED_INFO property is
 560  * handled, which tells us whether a dock client should be mapped or unmapped.
 561  *
 562  */
 563 static void handle_property_notify(xcb_property_notify_event_t *event) {
 564     DLOG("PropertyNotify\n");
 565     if (event->atom == atoms[_XEMBED_INFO] &&
 566         event->state == XCB_PROPERTY_NEW_VALUE) {
 567         DLOG("xembed_info updated\n");
 568         trayclient *trayclient = NULL, *walk;
 569         i3_output *o_walk;
 570         SLIST_FOREACH(o_walk, outputs, slist) {
 571             if (!o_walk->active)
 572                 continue;
 573
 574             TAILQ_FOREACH(walk, o_walk->trayclients, tailq) {
 575                 if (walk->win != event->window)
 576                     continue;
 577                 trayclient = walk;
 578                 break;
 579             }
 580
 581             if (trayclient)
 582                 break;
 583         }
 584         if (!trayclient) {
 585             ELOG("PropertyNotify received for unknown window %08x\n",
 586                  event->window);
 587             return;
 588         }
 589         xcb_get_property_cookie_t xembedc;
 590         xembedc = xcb_get_property_unchecked(xcb_connection,
 591                                              0,
 592                                              trayclient->win,
 593                                              atoms[_XEMBED_INFO],
 594                                              XCB_GET_PROPERTY_TYPE_ANY,
 595                                              0,
 596                                              2 * 32);
 597
 598         xcb_get_property_reply_t *xembedr = xcb_get_property_reply(xcb_connection,
 599                                                                    xembedc,
 600                                                                    NULL);
 601         if (xembedr == NULL || xembedr->length == 0) {
 602             DLOG("xembed_info unset\n");
 603             return;
 604         }
 605
 606         DLOG("xembed format = %d, len = %d\n", xembedr->format, xembedr->length);
 607         uint32_t *xembed = xcb_get_property_value(xembedr);
 608         DLOG("xembed version = %d\n", xembed[0]);
 609         DLOG("xembed flags = %d\n", xembed[1]);
 610         bool map_it = ((xembed[1] & XEMBED_MAPPED) == XEMBED_MAPPED);
 611         DLOG("map-state now %d\n", map_it);
 612         if (trayclient->mapped && !map_it) {
 613             /* need to unmap the window */
 614             xcb_unmap_window(xcb_connection, trayclient->win);
 615             trayclient->mapped = map_it;
 616             configure_trayclients();
 617             draw_bars();
 618         } else if (!trayclient->mapped && map_it) {
 619             /* need to map the window */
 620             xcb_map_window(xcb_connection, trayclient->win);
 621             trayclient->mapped = map_it;
 622             configure_trayclients();
 623             draw_bars();
 624         }
 625         free(xembedr);
 626     }
 627 }
 628
 629 /*
 630  * Handle ConfigureRequests by denying them and sending the client a
 631  * ConfigureNotify with its actual size.
 632  *
 633  */
 634 static void handle_configure_request(xcb_configure_request_event_t *event) {
 635     DLOG("ConfigureRequest for window = %08x\n", event->window);
 636
 637     trayclient *trayclient;
 638     i3_output *output;
 639     SLIST_FOREACH(output, outputs, slist) {
 640         if (!output->active)
 641             continue;
 642
 643         int clients = 0;
 644         TAILQ_FOREACH_REVERSE(trayclient, output->trayclients, tc_head, tailq) {
 645             if (!trayclient->mapped)
 646                 continue;
 647             clients++;
 648
 649             if (trayclient->win != event->window)
 650                 continue;
 651
 652             xcb_rectangle_t rect;
 653             rect.x = output->rect.w - (clients * (font_height + 2));
 654             rect.y = 2;
 655             rect.width = font_height;
 656             rect.height = font_height;
 657
 658             DLOG("This is a tray window. x = %d\n", rect.x);
 659             fake_configure_notify(xcb_connection, rect, event->window, 0);
 660             return;
 661         }
 662     }
 663
 664     DLOG("WARNING: Could not find corresponding tray window.\n");
 665 }
 666
 667 /*
 668  * This function is called immediately before the main loop locks. We flush xcb
 669  * then (and only then)
 670  *
 671  */
 672 void xcb_prep_cb(struct ev_loop *loop, ev_prepare *watcher, int revents) {
 673     xcb_flush(xcb_connection);
 674 }
 675
 676 /*
 677  * This function is called immediately after the main loop locks, so when one
 678  * of the watchers registered an event.
 679  * We check whether an X-Event arrived and handle it.
 680  *
 681  */
 682 void xcb_chk_cb(struct ev_loop *loop, ev_check *watcher, int revents) {
 683     xcb_generic_event_t *event;
 684
 685     if (xcb_connection_has_error(xcb_connection)) {
 686         ELOG("X11 connection was closed unexpectedly - maybe your X server terminated / crashed?\n");
 687         exit(1);
 688     }
 689
 690     while ((event = xcb_poll_for_event(xcb_connection)) != NULL) {
 691         switch (event->response_type & ~0x80) {
 692             case XCB_EXPOSE:
 693                 /* Expose-events happen, when the window needs to be redrawn */
 694                 redraw_bars();
 695                 break;
 696             case XCB_BUTTON_PRESS:
 697                 /* Button-press-events are mouse-buttons clicked on one of our bars */
 698                 handle_button((xcb_button_press_event_t*) event);
 699                 break;
 700             case XCB_CLIENT_MESSAGE:
 701                 /* Client messages are used for client-to-client communication, for
 702                  * example system tray widgets talk to us directly via client messages. */
 703                 handle_client_message((xcb_client_message_event_t*) event);
 704                 break;
 705             case XCB_UNMAP_NOTIFY:
 706             case XCB_DESTROY_NOTIFY:
 707                 /* UnmapNotifies are received when a tray window unmaps itself */
 708                 handle_unmap_notify((xcb_unmap_notify_event_t*) event);
 709                 break;
 710             case XCB_PROPERTY_NOTIFY:
 711                 /* PropertyNotify */
 712                 handle_property_notify((xcb_property_notify_event_t*) event);
 713                 break;
 714             case XCB_CONFIGURE_REQUEST:
 715                 /* ConfigureRequest, sent by a tray child */
 716                 handle_configure_request((xcb_configure_request_event_t*) event);
 717                 break;
 718         }
 719         free(event);
 720     }
 721 }
 722
 723 /*
 724  * Dummy Callback. We only need this, so that the Prepare- and Check-Watchers
 725  * are triggered
 726  *
 727  */
 728 void xcb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 729 }
 730
 731 /*
 732  * We need to bind to the modifier per XKB. Sadly, XCB does not implement this
 733  *
 734  */
 735 void xkb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 736     XkbEvent ev;
 737     int modstate = 0;
 738
 739     DLOG("Got XKB-Event!\n");
 740
 741     while (XPending(xkb_dpy)) {
 742         XNextEvent(xkb_dpy, (XEvent*)&ev);
 743
 744         if (ev.type != xkb_event_base) {
 745             ELOG("No Xkb-Event!\n");
 746             continue;
 747         }
 748
 749         if (ev.any.xkb_type != XkbStateNotify) {
 750             ELOG("No State Notify!\n");
 751             continue;
 752         }
 753
 754         unsigned int mods = ev.state.mods;
 755         modstate = mods & Mod4Mask;
 756     }
 757
 758     if (modstate != mod_pressed) {
 759         if (modstate == 0) {
 760             DLOG("Mod4 got released!\n");
 761             hide_bars();
 762         } else {
 763             DLOG("Mod4 got pressed!\n");
 764             unhide_bars();
 765         }
 766         mod_pressed = modstate;
 767     }
 768 }
 769
 770 /*
 771  * Early initialization of the connection to X11: Everything which does not
 772  * depend on 'config'.
 773  *
 774  */
 775 char *init_xcb_early() {
 776     /* FIXME: xcb_connect leaks Memory */
 777     xcb_connection = xcb_connect(NULL, &screen);
 778     if (xcb_connection_has_error(xcb_connection)) {
 779         ELOG("Cannot open display\n");
 780         exit(EXIT_FAILURE);
 781     }
 782     DLOG("Connected to xcb\n");
 783
 784     /* We have to request the atoms we need */
 785     #define ATOM_DO(name) atom_cookies[name] = xcb_intern_atom(xcb_connection, 0, strlen(#name), #name);
 786     #include "xcb_atoms.def"
 787
 788     xcb_screen = xcb_aux_get_screen(xcb_connection, screen);
 789     xcb_root = xcb_screen->root;
 790
 791     /* We draw the statusline to a seperate pixmap, because it looks the same on all bars and
 792      * this way, we can choose to crop it */
 793     uint32_t mask = XCB_GC_FOREGROUND;
 794     uint32_t vals[] = { colors.bar_bg, colors.bar_bg };
 795
 796     statusline_clear = xcb_generate_id(xcb_connection);
 797     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 798                                                                statusline_clear,
 799                                                                xcb_root,
 800                                                                mask,
 801                                                                vals);
 802
 803     mask |= XCB_GC_BACKGROUND;
 804     vals[0] = colors.bar_fg;
 805     statusline_ctx = xcb_generate_id(xcb_connection);
 806     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 807                                                             statusline_ctx,
 808                                                             xcb_root,
 809                                                             mask,
 810                                                             vals);
 811
 812     statusline_pm = xcb_generate_id(xcb_connection);
 813     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 814                                                                xcb_screen->root_depth,
 815                                                                statusline_pm,
 816                                                                xcb_root,
 817                                                                xcb_screen->width_in_pixels,
 818                                                                xcb_screen->height_in_pixels);
 819
 820
 821     /* The various Watchers to communicate with xcb */
 822     xcb_io = smalloc(sizeof(ev_io));
 823     xcb_prep = smalloc(sizeof(ev_prepare));
 824     xcb_chk = smalloc(sizeof(ev_check));
 825
 826     ev_io_init(xcb_io, &xcb_io_cb, xcb_get_file_descriptor(xcb_connection), EV_READ);
 827     ev_prepare_init(xcb_prep, &xcb_prep_cb);
 828     ev_check_init(xcb_chk, &xcb_chk_cb);
 829
 830     ev_io_start(main_loop, xcb_io);
 831     ev_prepare_start(main_loop, xcb_prep);
 832     ev_check_start(main_loop, xcb_chk);
 833
 834     /* Now we get the atoms and save them in a nice data structure */
 835     get_atoms();
 836
 837     xcb_get_property_cookie_t path_cookie;
 838     path_cookie = xcb_get_property_unchecked(xcb_connection,
 839                                    0,
 840                                    xcb_root,
 841                                    atoms[I3_SOCKET_PATH],
 842                                    XCB_GET_PROPERTY_TYPE_ANY,
 843                                    0, PATH_MAX);
 844
 845     /* We check, if i3 set its socket-path */
 846     xcb_get_property_reply_t *path_reply = xcb_get_property_reply(xcb_connection,
 847                                                                   path_cookie,
 848                                                                   NULL);
 849     char *path = NULL;
 850     if (path_reply) {
 851         int len = xcb_get_property_value_length(path_reply);
 852         if (len != 0) {
 853             path = strndup(xcb_get_property_value(path_reply), len);
 854         }
 855     }
 856
 857
 858     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
 859         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
 860         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
 861         exit(EXIT_FAILURE);
 862     }
 863
 864     return path;
 865 }
 866
 867 /*
 868  * Initialization which depends on 'config' being usable. Called after the
 869  * configuration has arrived.
 870  *
 871  */
 872 void init_xcb_late(char *fontname) {
 873     if (fontname == NULL) {
 874         /* XXX: font fallback to 'misc' like i3 does it would be good. */
 875         fontname = "-misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1";
 876     }
 877
 878     /* We load and allocate the font */
 879     xcb_font = xcb_generate_id(xcb_connection);
 880     xcb_void_cookie_t open_font_cookie;
 881     open_font_cookie = xcb_open_font_checked(xcb_connection,
 882                                              xcb_font,
 883                                              strlen(fontname),
 884                                              fontname);
 885
 886     /* We need to save info about the font, because we need the font's height and
 887      * information about the width of characters */
 888     xcb_query_font_cookie_t query_font_cookie;
 889     query_font_cookie = xcb_query_font(xcb_connection,
 890                                        xcb_font);
 891
 892     xcb_change_gc(xcb_connection,
 893                   statusline_ctx,
 894                   XCB_GC_FONT,
 895                   (uint32_t[]){ xcb_font });
 896
 897     xcb_flush(xcb_connection);
 898
 899     /* To grab modifiers without blocking other applications from receiving key-events
 900      * involving that modifier, we sadly have to use xkb which is not yet fully supported
 901      * in xcb */
 902     if (config.hide_on_modifier) {
 903         int xkb_major, xkb_minor, xkb_errbase, xkb_err;
 904         xkb_major = XkbMajorVersion;
 905         xkb_minor = XkbMinorVersion;
 906
 907         xkb_dpy = XkbOpenDisplay(NULL,
 908                                  &xkb_event_base,
 909                                  &xkb_errbase,
 910                                  &xkb_major,
 911                                  &xkb_minor,
 912                                  &xkb_err);
 913
 914         if (xkb_dpy == NULL) {
 915             ELOG("No XKB!\n");
 916             exit(EXIT_FAILURE);
 917         }
 918
 919         if (fcntl(ConnectionNumber(xkb_dpy), F_SETFD, FD_CLOEXEC) == -1) {
 920             ELOG("Could not set FD_CLOEXEC on xkbdpy: %s\n", strerror(errno));
 921             exit(EXIT_FAILURE);
 922         }
 923
 924         int i1;
 925         if (!XkbQueryExtension(xkb_dpy, &i1, &xkb_event_base, &xkb_errbase, &xkb_major, &xkb_minor)) {
 926             ELOG("XKB not supported by X-server!\n");
 927             exit(EXIT_FAILURE);
 928         }
 929
 930         if (!XkbSelectEvents(xkb_dpy, XkbUseCoreKbd, XkbStateNotifyMask, XkbStateNotifyMask)) {
 931             ELOG("Could not grab Key!\n");
 932             exit(EXIT_FAILURE);
 933         }
 934
 935         xkb_io = smalloc(sizeof(ev_io));
 936         ev_io_init(xkb_io, &xkb_io_cb, ConnectionNumber(xkb_dpy), EV_READ);
 937         ev_io_start(main_loop, xkb_io);
 938         XFlush(xkb_dpy);
 939     }
 940
 941     /* Now we save the font-infos */
 942     font_info = xcb_query_font_reply(xcb_connection,
 943                                      query_font_cookie,
 944                                      NULL);
 945
 946     if (xcb_request_failed(open_font_cookie, "Could not open font")) {
 947         exit(EXIT_FAILURE);
 948     }
 949
 950     font_height = font_info->font_ascent + font_info->font_descent;
 951
 952     if (xcb_query_font_char_infos_length(font_info) == 0) {
 953         font_table = NULL;
 954     } else {
 955         font_table = xcb_query_font_char_infos(font_info);
 956     }
 957
 958     DLOG("Calculated Font-height: %d\n", font_height);
 959 }
 960
 961 /*
 962  * Initializes tray support by requesting the appropriate _NET_SYSTEM_TRAY atom
 963  * for the X11 display we are running on, then acquiring the selection for this
 964  * atom. Afterwards, tray clients will send ClientMessages to our window.
 965  *
 966  */
 967 void init_tray() {
 968     DLOG("Initializing system tray functionality\n");
 969     /* request the tray manager atom for the X11 display we are running on */
 970     char atomname[strlen("_NET_SYSTEM_TRAY_S") + 11];
 971     snprintf(atomname, strlen("_NET_SYSTEM_TRAY_S") + 11, "_NET_SYSTEM_TRAY_S%d", screen);
 972     xcb_intern_atom_cookie_t tray_cookie;
 973     xcb_intern_atom_reply_t *tray_reply;
 974     tray_cookie = xcb_intern_atom(xcb_connection, 0, strlen(atomname), atomname);
 975
 976     /* tray support: we need a window to own the selection */
 977     xcb_window_t selwin = xcb_generate_id(xcb_connection);
 978     uint32_t selmask = XCB_CW_OVERRIDE_REDIRECT;
 979     uint32_t selval[] = { 1 };
 980     xcb_create_window(xcb_connection,
 981                       xcb_screen->root_depth,
 982                       selwin,
 983                       xcb_root,
 984                       -1, -1,
 985                       1, 1,
 986                       1,
 987                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
 988                       xcb_screen->root_visual,
 989                       selmask,
 990                       selval);
 991
 992     uint32_t orientation = _NET_SYSTEM_TRAY_ORIENTATION_HORZ;
 993     /* set the atoms */
 994     xcb_change_property(xcb_connection,
 995                         XCB_PROP_MODE_REPLACE,
 996                         selwin,
 997                         atoms[_NET_SYSTEM_TRAY_ORIENTATION],
 998                         XCB_ATOM_CARDINAL,
 999                         32,
1000                         1,
1001                         &orientation);
1002
1003     if (!(tray_reply = xcb_intern_atom_reply(xcb_connection, tray_cookie, NULL))) {
1004         ELOG("Could not get atom %s\n", atomname);
1005         exit(EXIT_FAILURE);
1006     }
1007
1008     xcb_set_selection_owner(xcb_connection,
1009                             selwin,
1010                             tray_reply->atom,
1011                             XCB_CURRENT_TIME);
1012
1013     /* Verify that we have the selection */
1014     xcb_get_selection_owner_cookie_t selcookie;
1015     xcb_get_selection_owner_reply_t *selreply;
1016
1017     selcookie = xcb_get_selection_owner(xcb_connection, tray_reply->atom);
1018     if (!(selreply = xcb_get_selection_owner_reply(xcb_connection, selcookie, NULL))) {
1019         ELOG("Could not get selection owner for %s\n", atomname);
1020         exit(EXIT_FAILURE);
1021     }
1022
1023     if (selreply->owner != selwin) {
1024         ELOG("Could not set the %s selection. " \
1025              "Maybe another tray is already running?\n", atomname);
1026         /* NOTE that this error is not fatal. We just can’t provide tray
1027          * functionality */
1028         free(selreply);
1029         return;
1030     }
1031
1032     /* Inform clients waiting for a new _NET_SYSTEM_TRAY that we are here */
1033     void *event = scalloc(32);
1034     xcb_client_message_event_t *ev = event;
1035     ev->response_type = XCB_CLIENT_MESSAGE;
1036     ev->window = xcb_root;
1037     ev->type = atoms[MANAGER];
1038     ev->format = 32;
1039     ev->data.data32[0] = XCB_CURRENT_TIME;
1040     ev->data.data32[1] = tray_reply->atom;
1041     ev->data.data32[2] = selwin;
1042     xcb_send_event(xcb_connection,
1043                    0,
1044                    xcb_root,
1045                    XCB_EVENT_MASK_STRUCTURE_NOTIFY,
1046                    (char*)ev);
1047     free(event);
1048     free(tray_reply);
1049 }
1050
1051 /*
1052  * Cleanup the xcb-stuff.
1053  * Called once, before the program terminates.
1054  *
1055  */
1056 void clean_xcb() {
1057     i3_output *o_walk;
1058     trayclient *trayclient;
1059     free_workspaces();
1060     SLIST_FOREACH(o_walk, outputs, slist) {
1061         TAILQ_FOREACH(trayclient, o_walk->trayclients, tailq) {
1062             /* Unmap, then reparent (to root) the tray client windows */
1063             xcb_unmap_window(xcb_connection, trayclient->win);
1064             xcb_reparent_window(xcb_connection,
1065                                 trayclient->win,
1066                                 xcb_root,
1067                                 0,
1068                                 0);
1069         }
1070         destroy_window(o_walk);
1071         FREE(o_walk->trayclients);
1072         FREE(o_walk->workspaces);
1073         FREE(o_walk->name);
1074     }
1075     FREE_SLIST(outputs, i3_output);
1076     FREE(outputs);
1077
1078     xcb_flush(xcb_connection);
1079     xcb_disconnect(xcb_connection);
1080
1081     ev_check_stop(main_loop, xcb_chk);
1082     ev_prepare_stop(main_loop, xcb_prep);
1083     ev_io_stop(main_loop, xcb_io);
1084
1085     FREE(xcb_chk);
1086     FREE(xcb_prep);
1087     FREE(xcb_io);
1088     FREE(font_info);
1089 }
1090
1091 /*
1092  * Get the earlier requested atoms and save them in the prepared data structure
1093  *
1094  */
1095 void get_atoms() {
1096     xcb_intern_atom_reply_t *reply;
1097     #define ATOM_DO(name) reply = xcb_intern_atom_reply(xcb_connection, atom_cookies[name], NULL); \
1098         if (reply == NULL) { \
1099             ELOG("Could not get atom %s\n", #name); \
1100             exit(EXIT_FAILURE); \
1101         } \
1102         atoms[name] = reply->atom; \
1103         free(reply);
1104
1105     #include "xcb_atoms.def"
1106     DLOG("Got Atoms\n");
1107 }
1108
1109 /*
1110  * Destroy the bar of the specified output
1111  *
1112  */
1113 void destroy_window(i3_output *output) {
1114     if (output == NULL) {
1115         return;
1116     }
1117     if (output->bar == XCB_NONE) {
1118         return;
1119     }
1120     xcb_destroy_window(xcb_connection, output->bar);
1121     output->bar = XCB_NONE;
1122 }
1123
1124 /*
1125  * Reallocate the statusline-buffer
1126  *
1127  */
1128 void realloc_sl_buffer() {
1129     DLOG("Re-allocating statusline-buffer, statusline_width = %d, xcb_screen->width_in_pixels = %d\n",
1130          statusline_width, xcb_screen->width_in_pixels);
1131     xcb_free_pixmap(xcb_connection, statusline_pm);
1132     statusline_pm = xcb_generate_id(xcb_connection);
1133     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1134                                                                xcb_screen->root_depth,
1135                                                                statusline_pm,
1136                                                                xcb_root,
1137                                                                MAX(xcb_screen->width_in_pixels, statusline_width),
1138                                                                xcb_screen->height_in_pixels);
1139
1140     uint32_t mask = XCB_GC_FOREGROUND;
1141     uint32_t vals[3] = { colors.bar_bg, colors.bar_bg, xcb_font };
1142     xcb_free_gc(xcb_connection, statusline_clear);
1143     statusline_clear = xcb_generate_id(xcb_connection);
1144     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
1145                                                                statusline_clear,
1146                                                                xcb_root,
1147                                                                mask,
1148                                                                vals);
1149
1150     mask |= XCB_GC_BACKGROUND | XCB_GC_FONT;
1151     vals[0] = colors.bar_fg;
1152     statusline_ctx = xcb_generate_id(xcb_connection);
1153     xcb_free_gc(xcb_connection, statusline_ctx);
1154     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
1155                                                             statusline_ctx,
1156                                                             xcb_root,
1157                                                             mask,
1158                                                             vals);
1159
1160     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
1161         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
1162         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
1163         exit(EXIT_FAILURE);
1164     }
1165
1166 }
1167
1168 /*
1169  * Reconfigure all bars and create new bars for recently activated outputs
1170  *
1171  */
1172 void reconfig_windows() {
1173     uint32_t mask;
1174     uint32_t values[5];
1175     static bool tray_configured = false;
1176
1177     i3_output *walk;
1178     SLIST_FOREACH(walk, outputs, slist) {
1179         if (!walk->active) {
1180             /* If an output is not active, we destroy its bar */
1181             /* FIXME: Maybe we rather want to unmap? */
1182             DLOG("Destroying window for output %s\n", walk->name);
1183             destroy_window(walk);
1184             continue;
1185         }
1186         if (walk->bar == XCB_NONE) {
1187             DLOG("Creating Window for output %s\n", walk->name);
1188
1189             walk->bar = xcb_generate_id(xcb_connection);
1190             walk->buffer = xcb_generate_id(xcb_connection);
1191             mask = XCB_CW_BACK_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
1192             /* Black background */
1193             values[0] = colors.bar_bg;
1194             /* If hide_on_modifier is set, i3 is not supposed to manage our bar-windows */
1195             values[1] = config.hide_on_modifier;
1196             /* We enable the following EventMask fields:
1197              * EXPOSURE, to get expose events (we have to re-draw then)
1198              * SUBSTRUCTURE_REDIRECT, to get ConfigureRequests when the tray
1199              *                        child windows use ConfigureWindow
1200              * BUTTON_PRESS, to handle clicks on the workspace buttons
1201              * */
1202             values[2] = XCB_EVENT_MASK_EXPOSURE |
1203                         XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT;
1204             if (!config.disable_ws) {
1205                 values[2] |= XCB_EVENT_MASK_BUTTON_PRESS;
1206             }
1207             xcb_void_cookie_t win_cookie = xcb_create_window_checked(xcb_connection,
1208                                                                      xcb_screen->root_depth,
1209                                                                      walk->bar,
1210                                                                      xcb_root,
1211                                                                      walk->rect.x, walk->rect.y + walk->rect.h - font_height - 6,
1212                                                                      walk->rect.w, font_height + 6,
1213                                                                      1,
1214                                                                      XCB_WINDOW_CLASS_INPUT_OUTPUT,
1215                                                                      xcb_screen->root_visual,
1216                                                                      mask,
1217                                                                      values);
1218
1219             /* The double-buffer we use to render stuff off-screen */
1220             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1221                                                                     xcb_screen->root_depth,
1222                                                                     walk->buffer,
1223                                                                     walk->bar,
1224                                                                     walk->rect.w,
1225                                                                     walk->rect.h);
1226
1227             /* Set the WM_CLASS and WM_NAME (we don't need UTF-8) atoms */
1228             xcb_void_cookie_t class_cookie;
1229             class_cookie = xcb_change_property(xcb_connection,
1230                                                XCB_PROP_MODE_REPLACE,
1231                                                walk->bar,
1232                                                XCB_ATOM_WM_CLASS,
1233                                                XCB_ATOM_STRING,
1234                                                8,
1235                                                (strlen("i3bar") + 1) * 2,
1236                                                "i3bar\0i3bar\0");
1237
1238             char *name;
1239             if (asprintf(&name, "i3bar for output %s", walk->name) == -1)
1240                 err(EXIT_FAILURE, "asprintf()");
1241             xcb_void_cookie_t name_cookie;
1242             name_cookie = xcb_change_property(xcb_connection,
1243                                               XCB_PROP_MODE_REPLACE,
1244                                               walk->bar,
1245                                               XCB_ATOM_WM_NAME,
1246                                               XCB_ATOM_STRING,
1247                                               8,
1248                                               strlen(name),
1249                                               name);
1250             free(name);
1251
1252             /* We want dock-windows (for now). When override_redirect is set, i3 is ignoring
1253              * this one */
1254             xcb_void_cookie_t dock_cookie = xcb_change_property(xcb_connection,
1255                                                                 XCB_PROP_MODE_REPLACE,
1256                                                                 walk->bar,
1257                                                                 atoms[_NET_WM_WINDOW_TYPE],
1258                                                                 XCB_ATOM_ATOM,
1259                                                                 32,
1260                                                                 1,
1261                                                                 (unsigned char*) &atoms[_NET_WM_WINDOW_TYPE_DOCK]);
1262
1263             /* We need to tell i3, where to reserve space for i3bar */
1264             /* left, right, top, bottom, left_start_y, left_end_y,
1265              * right_start_y, right_end_y, top_start_x, top_end_x, bottom_start_x,
1266              * bottom_end_x */
1267             /* A local struct to save the strut_partial property */
1268             struct {
1269                 uint32_t left;
1270                 uint32_t right;
1271                 uint32_t top;
1272                 uint32_t bottom;
1273                 uint32_t left_start_y;
1274                 uint32_t left_end_y;
1275                 uint32_t right_start_y;
1276                 uint32_t right_end_y;
1277                 uint32_t top_start_x;
1278                 uint32_t top_end_x;
1279                 uint32_t bottom_start_x;
1280                 uint32_t bottom_end_x;
1281             } __attribute__((__packed__)) strut_partial = {0,};
1282             switch (config.position) {
1283                 case POS_NONE:
1284                     break;
1285                 case POS_TOP:
1286                     strut_partial.top = font_height + 6;
1287                     strut_partial.top_start_x = walk->rect.x;
1288                     strut_partial.top_end_x = walk->rect.x + walk->rect.w;
1289                     break;
1290                 case POS_BOT:
1291                     strut_partial.bottom = font_height + 6;
1292                     strut_partial.bottom_start_x = walk->rect.x;
1293                     strut_partial.bottom_end_x = walk->rect.x + walk->rect.w;
1294                     break;
1295             }
1296             xcb_void_cookie_t strut_cookie = xcb_change_property(xcb_connection,
1297                                                                  XCB_PROP_MODE_REPLACE,
1298                                                                  walk->bar,
1299                                                                  atoms[_NET_WM_STRUT_PARTIAL],
1300                                                                  XCB_ATOM_CARDINAL,
1301                                                                  32,
1302                                                                  12,
1303                                                                  &strut_partial);
1304
1305             /* We also want a graphics-context for the bars (it defines the properties
1306              * with which we draw to them) */
1307             walk->bargc = xcb_generate_id(xcb_connection);
1308             mask = XCB_GC_FONT;
1309             values[0] = xcb_font;
1310             xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection,
1311                                                                 walk->bargc,
1312                                                                 walk->bar,
1313                                                                 mask,
1314                                                                 values);
1315
1316             /* We finally map the bar (display it on screen), unless the modifier-switch is on */
1317             xcb_void_cookie_t map_cookie;
1318             if (!config.hide_on_modifier) {
1319                 map_cookie = xcb_map_window_checked(xcb_connection, walk->bar);
1320             }
1321
1322             if (xcb_request_failed(win_cookie,   "Could not create window") ||
1323                 xcb_request_failed(pm_cookie,    "Could not create pixmap") ||
1324                 xcb_request_failed(dock_cookie,  "Could not set dock mode") ||
1325                 xcb_request_failed(class_cookie, "Could not set WM_CLASS")  ||
1326                 xcb_request_failed(name_cookie,  "Could not set WM_NAME")   ||
1327                 xcb_request_failed(strut_cookie, "Could not set strut")     ||
1328                 xcb_request_failed(gc_cookie,    "Could not create graphical context") ||
1329                 (!config.hide_on_modifier && xcb_request_failed(map_cookie, "Could not map window"))) {
1330                 exit(EXIT_FAILURE);
1331             }
1332
1333             if (!tray_configured &&
1334                 (!config.tray_output ||
1335                  strcasecmp("none", config.tray_output) != 0)) {
1336                 init_tray();
1337                 tray_configured = true;
1338             }
1339         } else {
1340             /* We already have a bar, so we just reconfigure it */
1341             mask = XCB_CONFIG_WINDOW_X |
1342                    XCB_CONFIG_WINDOW_Y |
1343                    XCB_CONFIG_WINDOW_WIDTH |
1344                    XCB_CONFIG_WINDOW_HEIGHT |
1345                    XCB_CONFIG_WINDOW_STACK_MODE;
1346             values[0] = walk->rect.x;
1347             values[1] = walk->rect.y + walk->rect.h - font_height - 6;
1348             values[2] = walk->rect.w;
1349             values[3] = font_height + 6;
1350             values[4] = XCB_STACK_MODE_ABOVE;
1351
1352             DLOG("Destroying buffer for output %s", walk->name);
1353             xcb_free_pixmap(xcb_connection, walk->buffer);
1354
1355             DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
1356             xcb_void_cookie_t cfg_cookie = xcb_configure_window_checked(xcb_connection,
1357                                                                         walk->bar,
1358                                                                         mask,
1359                                                                         values);
1360
1361             DLOG("Recreating buffer for output %s", walk->name);
1362             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1363                                                                     xcb_screen->root_depth,
1364                                                                     walk->buffer,
1365                                                                     walk->bar,
1366                                                                     walk->rect.w,
1367                                                                     walk->rect.h);
1368
1369             if (xcb_request_failed(cfg_cookie, "Could not reconfigure window")) {
1370                 exit(EXIT_FAILURE);
1371             }
1372             if (xcb_request_failed(pm_cookie,  "Could not create pixmap")) {
1373                 exit(EXIT_FAILURE);
1374             }
1375         }
1376     }
1377 }
1378
1379 /*
1380  * Render the bars, with buttons and statusline
1381  *
1382  */
1383 void draw_bars() {
1384     DLOG("Drawing Bars...\n");
1385     int i = 0;
1386
1387     refresh_statusline();
1388
1389     i3_output *outputs_walk;
1390     SLIST_FOREACH(outputs_walk, outputs, slist) {
1391         if (!outputs_walk->active) {
1392             DLOG("Output %s inactive, skipping...\n", outputs_walk->name);
1393             continue;
1394         }
1395         if (outputs_walk->bar == XCB_NONE) {
1396             /* Oh shit, an active output without an own bar. Create it now! */
1397             reconfig_windows();
1398         }
1399         /* First things first: clear the backbuffer */
1400         uint32_t color = colors.bar_bg;
1401         xcb_change_gc(xcb_connection,
1402                       outputs_walk->bargc,
1403                       XCB_GC_FOREGROUND,
1404                       &color);
1405         xcb_rectangle_t rect = { 0, 0, outputs_walk->rect.w, font_height + 6 };
1406         xcb_poly_fill_rectangle(xcb_connection,
1407                                 outputs_walk->buffer,
1408                                 outputs_walk->bargc,
1409                                 1,
1410                                 &rect);
1411
1412         if (statusline != NULL) {
1413             DLOG("Printing statusline!\n");
1414
1415             /* Luckily we already prepared a seperate pixmap containing the rendered
1416              * statusline, we just have to copy the relevant parts to the relevant
1417              * position */
1418             trayclient *trayclient;
1419             int traypx = 0;
1420             TAILQ_FOREACH(trayclient, outputs_walk->trayclients, tailq) {
1421                 if (!trayclient->mapped)
1422                     continue;
1423                 /* We assume the tray icons are quadratic (we use the font
1424                  * *height* as *width* of the icons) because we configured them
1425                  * like this. */
1426                 traypx += font_height + 2;
1427             }
1428             /* Add 2px of padding if there are any tray icons */
1429             if (traypx > 0)
1430                 traypx += 2;
1431             xcb_copy_area(xcb_connection,
1432                           statusline_pm,
1433                           outputs_walk->buffer,
1434                           outputs_walk->bargc,
1435                           MAX(0, (int16_t)(statusline_width - outputs_walk->rect.w + 4)), 0,
1436                           MAX(0, (int16_t)(outputs_walk->rect.w - statusline_width - traypx - 4)), 3,
1437                           MIN(outputs_walk->rect.w - traypx - 4, statusline_width), font_height);
1438         }
1439
1440         if (config.disable_ws) {
1441             continue;
1442         }
1443
1444         i3_ws *ws_walk;
1445         TAILQ_FOREACH(ws_walk, outputs_walk->workspaces, tailq) {
1446             DLOG("Drawing Button for WS %s at x = %d\n", ws_walk->name, i);
1447             uint32_t fg_color = colors.inactive_ws_fg;
1448             uint32_t bg_color = colors.inactive_ws_bg;
1449             if (ws_walk->visible) {
1450                 if (!ws_walk->focused) {
1451                     fg_color = colors.active_ws_fg;
1452                     bg_color = colors.active_ws_bg;
1453                 } else {
1454                     fg_color = colors.focus_ws_fg;
1455                     bg_color = colors.focus_ws_bg;
1456                 }
1457             }
1458             if (ws_walk->urgent) {
1459                 DLOG("WS %s is urgent!\n", ws_walk->name);
1460                 fg_color = colors.urgent_ws_fg;
1461                 bg_color = colors.urgent_ws_bg;
1462                 /* The urgent-hint should get noticed, so we unhide the bars shortly */
1463                 unhide_bars();
1464             }
1465             uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND;
1466             uint32_t vals[] = { bg_color, bg_color };
1467             xcb_change_gc(xcb_connection,
1468                           outputs_walk->bargc,
1469                           mask,
1470                           vals);
1471             xcb_rectangle_t rect = { i + 1, 1, ws_walk->name_width + 8, font_height + 4 };
1472             xcb_poly_fill_rectangle(xcb_connection,
1473                                     outputs_walk->buffer,
1474                                     outputs_walk->bargc,
1475                                     1,
1476                                     &rect);
1477             xcb_change_gc(xcb_connection,
1478                           outputs_walk->bargc,
1479                           XCB_GC_FOREGROUND,
1480                           &fg_color);
1481             xcb_image_text_16(xcb_connection,
1482                               ws_walk->name_glyphs,
1483                               outputs_walk->buffer,
1484                               outputs_walk->bargc,
1485                               i + 5, font_info->font_ascent + 2,
1486                               ws_walk->ucs2_name);
1487             i += 10 + ws_walk->name_width;
1488         }
1489
1490         i = 0;
1491     }
1492
1493     redraw_bars();
1494 }
1495
1496 /*
1497  * Redraw the bars, i.e. simply copy the buffer to the barwindow
1498  *
1499  */
1500 void redraw_bars() {
1501     i3_output *outputs_walk;
1502     SLIST_FOREACH(outputs_walk, outputs, slist) {
1503         if (!outputs_walk->active) {
1504             continue;
1505         }
1506         xcb_copy_area(xcb_connection,
1507                       outputs_walk->buffer,
1508                       outputs_walk->bar,
1509                       outputs_walk->bargc,
1510                       0, 0,
1511                       0, 0,
1512                       outputs_walk->rect.w,
1513                       outputs_walk->rect.h);
1514         xcb_flush(xcb_connection);
1515     }
1516 }