git.sur5r.net Git - i3/i3/blob - src/floating.c

   1 /*
   2  * vim:ts=4:sw=4:expandtab
   3  *
   4  * i3 - an improved dynamic tiling window manager
   5  *
   6  * © 2009-2010 Michael Stapelberg and contributors
   7  *
   8  * See file LICENSE for license information.
   9  *
  10  * src/floating.c: contains all functions for handling floating clients
  11  *
  12  */
  13
  14
  15 #include "all.h"
  16
  17 extern xcb_connection_t *conn;
  18
  19 void floating_enable(Con *con, bool automatic) {
  20     if (con_is_floating(con)) {
  21         LOG("Container is already in floating mode, not doing anything.\n");
  22         return;
  23     }
  24
  25     /* 1: detach the container from its parent */
  26     /* TODO: refactor this with tree_close() */
  27     TAILQ_REMOVE(&(con->parent->nodes_head), con, nodes);
  28     TAILQ_REMOVE(&(con->parent->focus_head), con, focused);
  29
  30     con_fix_percent(con->parent, WINDOW_REMOVE);
  31
  32     /* 2: create a new container to render the decoration on, add
  33      * it as a floating window to the workspace */
  34     Con *nc = con_new(NULL);
  35     nc->parent = con_get_workspace(con);
  36     nc->rect = con->rect;
  37     /* add pixels for the decoration */
  38     /* TODO: don’t add them when the user automatically puts new windows into
  39      * 1pixel/borderless mode */
  40     nc->rect.height += 17 + 2;
  41     nc->rect.width += 4;
  42     nc->orientation = NO_ORIENTATION;
  43     nc->type = CT_FLOATING_CON;
  44     TAILQ_INSERT_TAIL(&(nc->parent->floating_head), nc, floating_windows);
  45     TAILQ_INSERT_TAIL(&(nc->parent->focus_head), nc, focused);
  46
  47     /* 3: attach the child to the new parent container */
  48     con->old_parent = con->parent;
  49     con->parent = nc;
  50     con->floating = FLOATING_USER_ON;
  51
  52     /* Some clients (like GIMP’s color picker window) get mapped
  53      * to (0, 0), so we push them to a reasonable position
  54      * (centered over their leader) */
  55     if (nc->rect.x == 0 && nc->rect.y == 0) {
  56         /* TODO: client_leader support */
  57         nc->rect.x = 400;
  58         nc->rect.y = 400;
  59     }
  60
  61     TAILQ_INSERT_TAIL(&(nc->nodes_head), con, nodes);
  62     TAILQ_INSERT_TAIL(&(nc->focus_head), con, focused);
  63 }
  64
  65 void floating_disable(Con *con, bool automatic) {
  66     if (!con_is_floating(con)) {
  67         LOG("Container isn't floating, not doing anything.\n");
  68         return;
  69     }
  70
  71     assert(con->old_parent != NULL);
  72
  73     /* 1: detach from parent container */
  74     TAILQ_REMOVE(&(con->parent->nodes_head), con, nodes);
  75     TAILQ_REMOVE(&(con->parent->focus_head), con, focused);
  76
  77     /* 2: kill parent container */
  78     TAILQ_REMOVE(&(con->parent->parent->floating_head), con->parent, floating_windows);
  79     TAILQ_REMOVE(&(con->parent->parent->focus_head), con->parent, focused);
  80     tree_close(con->parent, false);
  81
  82     /* 3: re-attach to previous parent */
  83     con->parent = con->old_parent;
  84     TAILQ_INSERT_TAIL(&(con->parent->nodes_head), con, nodes);
  85     TAILQ_INSERT_TAIL(&(con->parent->focus_head), con, focused);
  86
  87     con->floating = FLOATING_USER_OFF;
  88
  89     con_fix_percent(con->parent, WINDOW_ADD);
  90 }
  91
  92
  93 /*
  94  * Toggles floating mode for the given container.
  95  *
  96  * If the automatic flag is set to true, this was an automatic update by a change of the
  97  * window class from the application which can be overwritten by the user.
  98  *
  99  */
 100 void toggle_floating_mode(Con *con, bool automatic) {
 101         //i3Font *font = load_font(conn, config.font);
 102
 103         /* see if the client is already floating */
 104         if (con_is_floating(con)) {
 105                 LOG("already floating, re-setting to tiling\n");
 106
 107                 floating_disable(con, automatic);
 108                 return;
 109         }
 110
 111         floating_enable(con, automatic);
 112
 113
 114 #if 0
 115         if (client->dock) {
 116                 DLOG("Not putting dock client into floating mode\n");
 117                 return;
 118         }
 119
 120         if (con == NULL) {
 121                 DLOG("This client is already in floating (container == NULL), re-inserting\n");
 122                 Client *next_tiling;
 123                 Workspace *ws = client->workspace;
 124                 SLIST_FOREACH(next_tiling, &(ws->focus_stack), focus_clients)
 125                         if (!client_is_floating(next_tiling))
 126                                 break;
 127                 /* If there are no tiling clients on this workspace, there can only be one
 128                  * container: the first one */
 129                 if (next_tiling == TAILQ_END(&(ws->focus_stack)))
 130                         con = ws->table[0][0];
 131                 else con = next_tiling->container;
 132
 133                 /* Remove the client from the list of floating clients */
 134                 TAILQ_REMOVE(&(ws->floating_clients), client, floating_clients);
 135
 136                 DLOG("destination container = %p\n", con);
 137                 Client *old_focused = con->currently_focused;
 138                 /* Preserve position/size */
 139                 memcpy(&(client->floating_rect), &(client->rect), sizeof(Rect));
 140
 141                 client->floating = FLOATING_USER_OFF;
 142                 client->container = con;
 143
 144                 if (old_focused != NULL && !old_focused->dock)
 145                         CIRCLEQ_INSERT_AFTER(&(con->clients), old_focused, client, clients);
 146                 else CIRCLEQ_INSERT_TAIL(&(con->clients), client, clients);
 147
 148                 DLOG("Re-inserted the window.\n");
 149                 con->currently_focused = client;
 150
 151                 client_set_below_floating(conn, client);
 152
 153                 render_container(conn, con);
 154                 xcb_flush(conn);
 155
 156                 return;
 157         }
 158
 159         DLOG("Entering floating for client %08x\n", client->child);
 160
 161         /* Remove the client of its container */
 162         client_remove_from_container(conn, client, con, false);
 163         client->container = NULL;
 164
 165         /* Add the client to the list of floating clients for its workspace */
 166         TAILQ_INSERT_TAIL(&(client->workspace->floating_clients), client, floating_clients);
 167
 168         if (con->currently_focused == client) {
 169                 DLOG("Need to re-adjust currently_focused\n");
 170                 /* Get the next client in the focus stack for this particular container */
 171                 con->currently_focused = get_last_focused_client(conn, con, NULL);
 172         }
 173
 174         if (automatic)
 175                 client->floating = FLOATING_AUTO_ON;
 176         else client->floating = FLOATING_USER_ON;
 177
 178         /* Initialize the floating position from the position in tiling mode, if this
 179          * client never was floating (x == -1) */
 180         if (client->floating_rect.x == -1) {
 181                 /* Copy over the position */
 182                 client->floating_rect.x = client->rect.x;
 183                 client->floating_rect.y = client->rect.y;
 184
 185                 /* Copy size the other direction */
 186                 client->child_rect.width = client->floating_rect.width;
 187                 client->child_rect.height = client->floating_rect.height;
 188
 189                 client->rect.width = client->child_rect.width + 2 + 2;
 190                 client->rect.height = client->child_rect.height + (font->height + 2 + 2) + 2;
 191
 192                 DLOG("copying size from tiling (%d, %d) size (%d, %d)\n", client->floating_rect.x, client->floating_rect.y,
 193                                 client->floating_rect.width, client->floating_rect.height);
 194         } else {
 195                 /* If the client was already in floating before we restore the old position / size */
 196                 DLOG("using: (%d, %d) size (%d, %d)\n", client->floating_rect.x, client->floating_rect.y,
 197                         client->floating_rect.width, client->floating_rect.height);
 198                 memcpy(&(client->rect), &(client->floating_rect), sizeof(Rect));
 199         }
 200
 201         /* Raise the client */
 202         xcb_raise_window(conn, client->frame);
 203         reposition_client(conn, client);
 204         resize_client(conn, client);
 205         /* redecorate_window flushes */
 206         redecorate_window(conn, client);
 207
 208         /* Re-render the tiling layout of this container */
 209         render_container(conn, con);
 210         xcb_flush(conn);
 211 #endif
 212 }
 213
 214 #if 0
 215 /*
 216  * Removes the floating client from its workspace and attaches it to the new workspace.
 217  * This is centralized here because it may happen if you move it via keyboard and
 218  * if you move it using your mouse.
 219  *
 220  */
 221 void floating_assign_to_workspace(Client *client, Workspace *new_workspace) {
 222         /* Remove from focus stack and list of floating clients */
 223         SLIST_REMOVE(&(client->workspace->focus_stack), client, Client, focus_clients);
 224         TAILQ_REMOVE(&(client->workspace->floating_clients), client, floating_clients);
 225
 226         if (client->workspace->fullscreen_client == client)
 227                 client->workspace->fullscreen_client = NULL;
 228
 229         /* Insert into destination focus stack and list of floating clients */
 230         client->workspace = new_workspace;
 231         SLIST_INSERT_HEAD(&(client->workspace->focus_stack), client, focus_clients);
 232         TAILQ_INSERT_TAIL(&(client->workspace->floating_clients), client, floating_clients);
 233         if (client->fullscreen)
 234                 client->workspace->fullscreen_client = client;
 235 }
 236
 237 /*
 238  * This is an ugly data structure which we need because there is no standard
 239  * way of having nested functions (only available as a gcc extension at the
 240  * moment, clang doesn’t support it) or blocks (only available as a clang
 241  * extension and only on Mac OS X systems at the moment).
 242  *
 243  */
 244 struct resize_callback_params {
 245         border_t border;
 246         xcb_button_press_event_t *event;
 247 };
 248
 249 DRAGGING_CB(resize_callback) {
 250         struct resize_callback_params *params = extra;
 251         xcb_button_press_event_t *event = params->event;
 252         switch (params->border) {
 253                 case BORDER_RIGHT: {
 254                         int new_width = old_rect->width + (new_x - event->root_x);
 255                         if ((new_width < 0) ||
 256                             (new_width < client_min_width(client) && client->rect.width >= new_width))
 257                                 return;
 258                         client->rect.width = new_width;
 259                         break;
 260                 }
 261
 262                 case BORDER_BOTTOM: {
 263                         int new_height = old_rect->height + (new_y - event->root_y);
 264                         if ((new_height < 0) ||
 265                             (new_height < client_min_height(client) && client->rect.height >= new_height))
 266                                 return;
 267                         client->rect.height = old_rect->height + (new_y - event->root_y);
 268                         break;
 269                 }
 270
 271                 case BORDER_TOP: {
 272                         int new_height = old_rect->height + (event->root_y - new_y);
 273                         if ((new_height < 0) ||
 274                             (new_height < client_min_height(client) && client->rect.height >= new_height))
 275                                 return;
 276
 277                         client->rect.y = old_rect->y + (new_y - event->root_y);
 278                         client->rect.height = new_height;
 279                         break;
 280                 }
 281
 282                 case BORDER_LEFT: {
 283                         int new_width = old_rect->width + (event->root_x - new_x);
 284                         if ((new_width < 0) ||
 285                             (new_width < client_min_width(client) && client->rect.width >= new_width))
 286                                 return;
 287                         client->rect.x = old_rect->x + (new_x - event->root_x);
 288                         client->rect.width = new_width;
 289                         break;
 290                 }
 291         }
 292
 293         /* Push the new position/size to X11 */
 294         reposition_client(conn, client);
 295         resize_client(conn, client);
 296         xcb_flush(conn);
 297 }
 298
 299
 300 /*
 301  * Called whenever the user clicks on a border (not the titlebar!) of a floating window.
 302  * Determines on which border the user clicked and launches the drag_pointer function
 303  * with the resize_callback.
 304  *
 305  */
 306 int floating_border_click(xcb_connection_t *conn, Client *client, xcb_button_press_event_t *event) {
 307         DLOG("floating border click\n");
 308
 309         border_t border;
 310
 311         if (event->event_y < 2)
 312                 border = BORDER_TOP;
 313         else if (event->event_y >= (client->rect.height - 2))
 314                 border = BORDER_BOTTOM;
 315         else if (event->event_x <= 2)
 316                 border = BORDER_LEFT;
 317         else if (event->event_x >= (client->rect.width - 2))
 318                 border = BORDER_RIGHT;
 319         else {
 320                 DLOG("Not on any border, not doing anything.\n");
 321                 return 1;
 322         }
 323
 324         DLOG("border = %d\n", border);
 325
 326         struct resize_callback_params params = { border, event };
 327
 328         drag_pointer(conn, client, event, XCB_NONE, border, resize_callback, &params);
 329
 330         return 1;
 331 }
 332
 333 #endif
 334 DRAGGING_CB(drag_window_callback) {
 335         struct xcb_button_press_event_t *event = extra;
 336
 337         /* Reposition the client correctly while moving */
 338         con->rect.x = old_rect->x + (new_x - event->root_x);
 339         con->rect.y = old_rect->y + (new_y - event->root_y);
 340         /* TODO: don’t re-render the whole tree just because we change
 341          * coordinates of a floating window */
 342         tree_render();
 343         x_push_changes(croot);
 344 }
 345
 346 /*
 347  * Called when the user clicked on the titlebar of a floating window.
 348  * Calls the drag_pointer function with the drag_window callback
 349  *
 350  */
 351 void floating_drag_window(Con *con, xcb_button_press_event_t *event) {
 352         DLOG("floating_drag_window\n");
 353
 354         drag_pointer(con, event, XCB_NONE, BORDER_TOP /* irrelevant */, drag_window_callback, event);
 355         tree_render();
 356 }
 357
 358 /*
 359  * This is an ugly data structure which we need because there is no standard
 360  * way of having nested functions (only available as a gcc extension at the
 361  * moment, clang doesn’t support it) or blocks (only available as a clang
 362  * extension and only on Mac OS X systems at the moment).
 363  *
 364  */
 365 struct resize_window_callback_params {
 366     border_t corner;
 367     bool proportional;
 368     xcb_button_press_event_t *event;
 369 };
 370
 371 DRAGGING_CB(resize_window_callback) {
 372     struct resize_window_callback_params *params = extra;
 373     xcb_button_press_event_t *event = params->event;
 374     border_t corner = params->corner;
 375
 376     int32_t dest_x = con->rect.x;
 377     int32_t dest_y = con->rect.y;
 378     uint32_t dest_width;
 379     uint32_t dest_height;
 380
 381     double ratio = (double) old_rect->width / old_rect->height;
 382
 383     /* First guess: We resize by exactly the amount the mouse moved,
 384      * taking into account in which corner the client was grabbed */
 385     if (corner & BORDER_LEFT)
 386             dest_width = old_rect->width - (new_x - event->root_x);
 387     else dest_width = old_rect->width + (new_x - event->root_x);
 388
 389     if (corner & BORDER_TOP)
 390             dest_height = old_rect->height - (new_y - event->root_y);
 391     else dest_height = old_rect->height + (new_y - event->root_y);
 392
 393     /* TODO: minimum window size */
 394 #if 0
 395     /* Obey minimum window size */
 396     dest_width = max(dest_width, client_min_width(client));
 397     dest_height = max(dest_height, client_min_height(client));
 398 #endif
 399
 400     /* User wants to keep proportions, so we may have to adjust our values */
 401     if (params->proportional) {
 402             dest_width = max(dest_width, (int) (dest_height * ratio));
 403             dest_height = max(dest_height, (int) (dest_width / ratio));
 404     }
 405
 406     /* If not the lower right corner is grabbed, we must also reposition
 407      * the client by exactly the amount we resized it */
 408     if (corner & BORDER_LEFT)
 409             dest_x = old_rect->x + (old_rect->width - dest_width);
 410
 411     if (corner & BORDER_TOP)
 412             dest_y = old_rect->y + (old_rect->height - dest_height);
 413
 414     con->rect = (Rect) { dest_x, dest_y, dest_width, dest_height };
 415
 416     /* TODO: don’t re-render the whole tree just because we change
 417      * coordinates of a floating window */
 418     tree_render();
 419     x_push_changes(croot);
 420 }
 421
 422 /*
 423  * Called when the user clicked on a floating window while holding the
 424  * floating_modifier and the right mouse button.
 425  * Calls the drag_pointer function with the resize_window callback
 426  *
 427  */
 428 void floating_resize_window(Con *con, bool proportional,
 429                             xcb_button_press_event_t *event) {
 430     DLOG("floating_resize_window\n");
 431
 432     /* corner saves the nearest corner to the original click. It contains
 433      * a bitmask of the nearest borders (BORDER_LEFT, BORDER_RIGHT, …) */
 434     border_t corner = 0;
 435
 436     if (event->event_x <= (con->rect.width / 2))
 437             corner |= BORDER_LEFT;
 438     else corner |= BORDER_RIGHT;
 439
 440     if (event->event_y <= (con->rect.height / 2))
 441             corner |= BORDER_TOP;
 442     else corner |= BORDER_RIGHT;
 443
 444     struct resize_window_callback_params params = { corner, proportional, event };
 445
 446     drag_pointer(con, event, XCB_NONE, BORDER_TOP /* irrelevant */, resize_window_callback, &params);
 447 }
 448
 449 /*
 450  * This function grabs your pointer and lets you drag stuff around (borders).
 451  * Every time you move your mouse, an XCB_MOTION_NOTIFY event will be received
 452  * and the given callback will be called with the parameters specified (client,
 453  * border on which the click originally was), the original rect of the client,
 454  * the event and the new coordinates (x, y).
 455  *
 456  */
 457 void drag_pointer(Con *con, xcb_button_press_event_t *event, xcb_window_t
 458                 confine_to, border_t border, callback_t callback, void *extra)
 459 {
 460         xcb_window_t root = xcb_setup_roots_iterator(xcb_get_setup(conn)).data->root;
 461         uint32_t new_x, new_y;
 462         Rect old_rect;
 463         if (con != NULL)
 464                 memcpy(&old_rect, &(con->rect), sizeof(Rect));
 465
 466         /* Grab the pointer */
 467         /* TODO: returncode */
 468         xcb_grab_pointer(conn,
 469                         false,               /* get all pointer events specified by the following mask */
 470                         root,                /* grab the root window */
 471                         XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_POINTER_MOTION, /* which events to let through */
 472                         XCB_GRAB_MODE_ASYNC, /* pointer events should continue as normal */
 473                         XCB_GRAB_MODE_ASYNC, /* keyboard mode */
 474                         confine_to,          /* confine_to = in which window should the cursor stay */
 475                         XCB_NONE,            /* don’t display a special cursor */
 476                         XCB_CURRENT_TIME);
 477
 478         /* Go into our own event loop */
 479         xcb_flush(conn);
 480
 481         xcb_generic_event_t *inside_event, *last_motion_notify = NULL;
 482         /* I’ve always wanted to have my own eventhandler… */
 483         while ((inside_event = xcb_wait_for_event(conn))) {
 484                 /* We now handle all events we can get using xcb_poll_for_event */
 485                 do {
 486                         /* Same as get_event_handler in xcb */
 487                         int nr = inside_event->response_type;
 488                         if (nr == 0) {
 489                                 /* An error occured */
 490                                 //handle_event(NULL, conn, inside_event);
 491                                 free(inside_event);
 492                                 continue;
 493                         }
 494                         assert(nr < 256);
 495                         nr &= XCB_EVENT_RESPONSE_TYPE_MASK;
 496                         assert(nr >= 2);
 497
 498                         switch (nr) {
 499                                 case XCB_BUTTON_RELEASE:
 500                                         goto done;
 501
 502                                 case XCB_MOTION_NOTIFY:
 503                                         /* motion_notify events are saved for later */
 504                                         FREE(last_motion_notify);
 505                                         last_motion_notify = inside_event;
 506                                         break;
 507
 508                                 case XCB_UNMAP_NOTIFY:
 509                                         DLOG("Unmap-notify, aborting\n");
 510                                         xcb_event_handle(&evenths, inside_event);
 511                                         goto done;
 512
 513                                 default:
 514                                         DLOG("Passing to original handler\n");
 515                                         /* Use original handler */
 516                                         xcb_event_handle(&evenths, inside_event);
 517                                         break;
 518                         }
 519                         if (last_motion_notify != inside_event)
 520                                 free(inside_event);
 521                 } while ((inside_event = xcb_poll_for_event(conn)) != NULL);
 522
 523                 if (last_motion_notify == NULL)
 524                         continue;
 525
 526                 new_x = ((xcb_motion_notify_event_t*)last_motion_notify)->root_x;
 527                 new_y = ((xcb_motion_notify_event_t*)last_motion_notify)->root_y;
 528
 529                 callback(con, &old_rect, new_x, new_y, extra);
 530                 FREE(last_motion_notify);
 531         }
 532 done:
 533         xcb_ungrab_pointer(conn, XCB_CURRENT_TIME);
 534         xcb_flush(conn);
 535 }
 536
 537 #if 0
 538 /*
 539  * Changes focus in the given direction for floating clients.
 540  *
 541  * Changing to the left/right means going to the previous/next floating client,
 542  * changing to top/bottom means cycling through the Z-index.
 543  *
 544  */
 545 void floating_focus_direction(xcb_connection_t *conn, Client *currently_focused, direction_t direction) {
 546         DLOG("floating focus\n");
 547
 548         if (direction == D_LEFT || direction == D_RIGHT) {
 549                 /* Go to the next/previous floating client */
 550                 Client *client;
 551
 552                 while ((client = (direction == D_LEFT ? TAILQ_PREV(currently_focused, floating_clients_head, floating_clients) :
 553                                                         TAILQ_NEXT(currently_focused, floating_clients))) !=
 554                        TAILQ_END(&(currently_focused->workspace->floating_clients))) {
 555                         if (!client->floating)
 556                                 continue;
 557                         set_focus(conn, client, true);
 558                         return;
 559                 }
 560         }
 561 }
 562
 563 /*
 564  * Moves the client 10px to the specified direction.
 565  *
 566  */
 567 void floating_move(xcb_connection_t *conn, Client *currently_focused, direction_t direction) {
 568         DLOG("floating move\n");
 569
 570         Rect destination = currently_focused->rect;
 571         Rect *screen = &(currently_focused->workspace->output->rect);
 572
 573         switch (direction) {
 574                 case D_LEFT:
 575                         destination.x -= 10;
 576                         break;
 577                 case D_RIGHT:
 578                         destination.x += 10;
 579                         break;
 580                 case D_UP:
 581                         destination.y -= 10;
 582                         break;
 583                 case D_DOWN:
 584                         destination.y += 10;
 585                         break;
 586                 /* to make static analyzers happy */
 587                 default:
 588                         break;
 589         }
 590
 591         /* Prevent windows from vanishing completely */
 592         if ((int32_t)(destination.x + destination.width - 5) <= (int32_t)screen->x ||
 593             (int32_t)(destination.x + 5) >= (int32_t)(screen->x + screen->width) ||
 594             (int32_t)(destination.y + destination.height - 5) <= (int32_t)screen->y ||
 595             (int32_t)(destination.y + 5) >= (int32_t)(screen->y + screen->height)) {
 596                 DLOG("boundary check failed, not moving\n");
 597                 return;
 598         }
 599
 600         currently_focused->rect = destination;
 601         reposition_client(conn, currently_focused);
 602
 603         /* Because reposition_client does not send a faked configure event (only resize does),
 604          * we need to initiate that on our own */
 605         fake_absolute_configure_notify(conn, currently_focused);
 606         /* fake_absolute_configure_notify flushes */
 607 }
 608
 609 /*
 610  * Hides all floating clients (or show them if they are currently hidden) on
 611  * the specified workspace.
 612  *
 613  */
 614 void floating_toggle_hide(xcb_connection_t *conn, Workspace *workspace) {
 615         Client *client;
 616
 617         workspace->floating_hidden = !workspace->floating_hidden;
 618         DLOG("floating_hidden is now: %d\n", workspace->floating_hidden);
 619         TAILQ_FOREACH(client, &(workspace->floating_clients), floating_clients) {
 620                 if (workspace->floating_hidden)
 621                         client_unmap(conn, client);
 622                 else client_map(conn, client);
 623         }
 624
 625         /* If we just unmapped all floating windows we should ensure that the focus
 626          * is set correctly, that ist, to the first non-floating client in stack */
 627         if (workspace->floating_hidden)
 628                 SLIST_FOREACH(client, &(workspace->focus_stack), focus_clients) {
 629                         if (client_is_floating(client))
 630                                 continue;
 631                         set_focus(conn, client, true);
 632                         return;
 633                 }
 634
 635         xcb_flush(conn);
 636 }
 637 #endif