i3
src/x.c
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00001 /*
00002  * vim:ts=4:sw=4:expandtab
00003  */
00004 
00005 #include "all.h"
00006 
00007 /* Stores the X11 window ID of the currently focused window */
00008 xcb_window_t focused_id = XCB_NONE;
00009 
00010 /*
00011  * Describes the X11 state we may modify (map state, position, window stack).
00012  * There is one entry per container. The state represents the current situation
00013  * as X11 sees it (with the exception of the order in the state_head CIRCLEQ,
00014  * which represents the order that will be pushed to X11, while old_state_head
00015  * represents the current order). It will be updated in x_push_changes().
00016  *
00017  */
00018 typedef struct con_state {
00019     xcb_window_t id;
00020     bool mapped;
00021     bool unmap_now;
00022     bool child_mapped;
00023 
00024     /* For reparenting, we have a flag (need_reparent) and the X ID of the old
00025      * frame this window was in. The latter is necessary because we need to
00026      * ignore UnmapNotify events (by changing the window event mask). */
00027     bool need_reparent;
00028     xcb_window_t old_frame;
00029 
00030     Rect rect;
00031     Rect window_rect;
00032 
00033     bool initial;
00034 
00035     char *name;
00036 
00037     CIRCLEQ_ENTRY(con_state) state;
00038     CIRCLEQ_ENTRY(con_state) old_state;
00039 } con_state;
00040 
00041 CIRCLEQ_HEAD(state_head, con_state) state_head =
00042     CIRCLEQ_HEAD_INITIALIZER(state_head);
00043 
00044 CIRCLEQ_HEAD(old_state_head, con_state) old_state_head =
00045     CIRCLEQ_HEAD_INITIALIZER(old_state_head);
00046 
00047 /*
00048  * Returns the container state for the given frame. This function always
00049  * returns a container state (otherwise, there is a bug in the code and the
00050  * container state of a container for which x_con_init() was not called was
00051  * requested).
00052  *
00053  */
00054 static con_state *state_for_frame(xcb_window_t window) {
00055     con_state *state;
00056     CIRCLEQ_FOREACH(state, &state_head, state)
00057         if (state->id == window)
00058             return state;
00059 
00060     /* TODO: better error handling? */
00061     ELOG("No state found\n");
00062     assert(false);
00063     return NULL;
00064 }
00065 
00066 /*
00067  * Initializes the X11 part for the given container. Called exactly once for
00068  * every container from con_new().
00069  *
00070  */
00071 void x_con_init(Con *con) {
00072     /* TODO: maybe create the window when rendering first? we could then even
00073      * get the initial geometry right */
00074 
00075     uint32_t mask = 0;
00076     uint32_t values[2];
00077 
00078     /* our own frames should not be managed */
00079     mask |= XCB_CW_OVERRIDE_REDIRECT;
00080     values[0] = 1;
00081 
00082     /* see include/xcb.h for the FRAME_EVENT_MASK */
00083     mask |= XCB_CW_EVENT_MASK;
00084     values[1] = FRAME_EVENT_MASK & ~XCB_EVENT_MASK_ENTER_WINDOW;
00085 
00086     Rect dims = { -15, -15, 10, 10 };
00087     con->frame = create_window(conn, dims, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCURSOR_CURSOR_POINTER, false, mask, values);
00088 
00089     struct con_state *state = scalloc(sizeof(struct con_state));
00090     state->id = con->frame;
00091     state->mapped = false;
00092     state->initial = true;
00093     CIRCLEQ_INSERT_HEAD(&state_head, state, state);
00094     CIRCLEQ_INSERT_HEAD(&old_state_head, state, old_state);
00095     DLOG("adding new state for window id 0x%08x\n", state->id);
00096 }
00097 
00098 /*
00099  * Re-initializes the associated X window state for this container. You have
00100  * to call this when you assign a client to an empty container to ensure that
00101  * its state gets updated correctly.
00102  *
00103  */
00104 void x_reinit(Con *con) {
00105     struct con_state *state;
00106 
00107     if ((state = state_for_frame(con->frame)) == NULL) {
00108         ELOG("window state not found\n");
00109         return;
00110     }
00111 
00112     DLOG("resetting state %p to initial\n", state);
00113     state->initial = true;
00114     state->child_mapped = false;
00115     memset(&(state->window_rect), 0, sizeof(Rect));
00116 }
00117 
00118 /*
00119  * Reparents the child window of the given container (necessary for sticky
00120  * containers). The reparenting happens in the next call of x_push_changes().
00121  *
00122  */
00123 void x_reparent_child(Con *con, Con *old) {
00124     struct con_state *state;
00125     if ((state = state_for_frame(con->frame)) == NULL) {
00126         ELOG("window state for con not found\n");
00127         return;
00128     }
00129 
00130     state->need_reparent = true;
00131     state->old_frame = old->frame;
00132 }
00133 
00134 /*
00135  * Moves a child window from Container src to Container dest.
00136  *
00137  */
00138 void x_move_win(Con *src, Con *dest) {
00139     struct con_state *state_src, *state_dest;
00140 
00141     if ((state_src = state_for_frame(src->frame)) == NULL) {
00142         ELOG("window state for src not found\n");
00143         return;
00144     }
00145 
00146     if ((state_dest = state_for_frame(dest->frame)) == NULL) {
00147         ELOG("window state for dest not found\n");
00148         return;
00149     }
00150 
00151     Rect zero = { 0, 0, 0, 0 };
00152     if (memcmp(&(state_dest->window_rect), &(zero), sizeof(Rect)) == 0) {
00153         memcpy(&(state_dest->window_rect), &(state_src->window_rect), sizeof(Rect));
00154         DLOG("COPYING RECT\n");
00155     }
00156 }
00157 
00158 /*
00159  * Kills the window decoration associated with the given container.
00160  *
00161  */
00162 void x_con_kill(Con *con) {
00163     con_state *state;
00164 
00165     xcb_destroy_window(conn, con->frame);
00166     xcb_free_pixmap(conn, con->pixmap);
00167     xcb_free_gc(conn, con->pm_gc);
00168     state = state_for_frame(con->frame);
00169     CIRCLEQ_REMOVE(&state_head, state, state);
00170     CIRCLEQ_REMOVE(&old_state_head, state, old_state);
00171     FREE(state->name);
00172     free(state);
00173 
00174     /* Invalidate focused_id to correctly focus new windows with the same ID */
00175     focused_id = XCB_NONE;
00176 }
00177 
00178 /*
00179  * Returns true if the client supports the given protocol atom (like WM_DELETE_WINDOW)
00180  *
00181  */
00182 bool window_supports_protocol(xcb_window_t window, xcb_atom_t atom) {
00183     xcb_get_property_cookie_t cookie;
00184     xcb_icccm_get_wm_protocols_reply_t protocols;
00185     bool result = false;
00186 
00187     cookie = xcb_icccm_get_wm_protocols(conn, window, A_WM_PROTOCOLS);
00188     if (xcb_icccm_get_wm_protocols_reply(conn, cookie, &protocols, NULL) != 1)
00189         return false;
00190 
00191     /* Check if the client’s protocols have the requested atom set */
00192     for (uint32_t i = 0; i < protocols.atoms_len; i++)
00193         if (protocols.atoms[i] == atom)
00194             result = true;
00195 
00196     xcb_icccm_get_wm_protocols_reply_wipe(&protocols);
00197 
00198     return result;
00199 }
00200 
00201 /*
00202  * Kills the given X11 window using WM_DELETE_WINDOW (if supported).
00203  *
00204  */
00205 void x_window_kill(xcb_window_t window, kill_window_t kill_window) {
00206     /* if this window does not support WM_DELETE_WINDOW, we kill it the hard way */
00207     if (!window_supports_protocol(window, A_WM_DELETE_WINDOW)) {
00208         if (kill_window == KILL_WINDOW) {
00209             LOG("Killing specific window 0x%08x\n", window);
00210             xcb_destroy_window(conn, window);
00211         } else {
00212             LOG("Killing the X11 client which owns window 0x%08x\n", window);
00213             xcb_kill_client(conn, window);
00214         }
00215         return;
00216     }
00217 
00218     /* Every X11 event is 32 bytes long. Therefore, XCB will copy 32 bytes.
00219      * In order to properly initialize these bytes, we allocate 32 bytes even
00220      * though we only need less for an xcb_configure_notify_event_t */
00221     void *event = scalloc(32);
00222     xcb_client_message_event_t *ev = event;
00223 
00224     ev->response_type = XCB_CLIENT_MESSAGE;
00225     ev->window = window;
00226     ev->type = A_WM_PROTOCOLS;
00227     ev->format = 32;
00228     ev->data.data32[0] = A_WM_DELETE_WINDOW;
00229     ev->data.data32[1] = XCB_CURRENT_TIME;
00230 
00231     LOG("Sending WM_DELETE to the client\n");
00232     xcb_send_event(conn, false, window, XCB_EVENT_MASK_NO_EVENT, (char*)ev);
00233     xcb_flush(conn);
00234     free(event);
00235 }
00236 
00237 /*
00238  * Draws the decoration of the given container onto its parent.
00239  *
00240  */
00241 void x_draw_decoration(Con *con) {
00242     Con *parent = con->parent;
00243     /* This code needs to run for:
00244      *  • leaf containers
00245      *  • non-leaf containers which are in a stacked/tabbed container
00246      *
00247      * It does not need to run for:
00248      *  • floating containers (they don’t have a decoration)
00249      */
00250     if ((!con_is_leaf(con) &&
00251          parent->layout != L_STACKED &&
00252          parent->layout != L_TABBED) ||
00253         con->type == CT_FLOATING_CON)
00254         return;
00255     DLOG("decoration should be rendered for con %p\n", con);
00256 
00257     /* Skip containers whose height is 0 (for example empty dockareas) */
00258     if (con->rect.height == 0) {
00259         DLOG("height == 0, not rendering\n");
00260         return;
00261     }
00262 
00263     /* Skip containers whose pixmap has not yet been created (can happen when
00264      * decoration rendering happens recursively for a window for which
00265      * x_push_node() was not yet called) */
00266     if (con->pixmap == XCB_NONE) {
00267         DLOG("pixmap not yet created, not rendering\n");
00268         return;
00269     }
00270 
00271     /* 1: build deco_params and compare with cache */
00272     struct deco_render_params *p = scalloc(sizeof(struct deco_render_params));
00273 
00274     /* find out which colors to use */
00275     if (con->urgent)
00276         p->color = &config.client.urgent;
00277     else if (con == focused)
00278         p->color = &config.client.focused;
00279     else if (con == TAILQ_FIRST(&(parent->focus_head)))
00280         p->color = &config.client.focused_inactive;
00281     else
00282         p->color = &config.client.unfocused;
00283 
00284     p->border_style = con_border_style(con);
00285 
00286     Rect *r = &(con->rect);
00287     Rect *w = &(con->window_rect);
00288     p->con_rect = (struct width_height){ r->width, r->height };
00289     p->con_window_rect = (struct width_height){ w->width, w->height };
00290     p->con_deco_rect = con->deco_rect;
00291     p->background = config.client.background;
00292     p->con_is_leaf = con_is_leaf(con);
00293     p->font = config.font.id;
00294 
00295     if (con->deco_render_params != NULL &&
00296         (con->window == NULL || !con->window->name_x_changed) &&
00297         !parent->pixmap_recreated &&
00298         !con->pixmap_recreated &&
00299         memcmp(p, con->deco_render_params, sizeof(struct deco_render_params)) == 0) {
00300         DLOG("CACHE HIT, copying existing pixmaps\n");
00301         free(p);
00302         goto copy_pixmaps;
00303     }
00304 
00305     DLOG("CACHE MISS\n");
00306     Con *next = con;
00307     while ((next = TAILQ_NEXT(next, nodes))) {
00308         DLOG("Also invalidating cache of %p\n", next);
00309         FREE(next->deco_render_params);
00310     }
00311 
00312     FREE(con->deco_render_params);
00313     con->deco_render_params = p;
00314 
00315     if (con->window != NULL && con->window->name_x_changed)
00316         con->window->name_x_changed = false;
00317 
00318     parent->pixmap_recreated = false;
00319     con->pixmap_recreated = false;
00320 
00321     /* 2: draw the client.background, but only for the parts around the client_rect */
00322     if (con->window != NULL) {
00323         xcb_rectangle_t background[] = {
00324             /* top area */
00325             { 0, 0, r->width, w->y },
00326             /* bottom area */
00327             { 0, (w->y + w->height), r->width, r->height - (w->y + w->height) },
00328             /* left area */
00329             { 0, 0, w->x, r->height },
00330             /* right area */
00331             { w->x + w->width, 0, r->width - (w->x + w->width), r->height }
00332         };
00333 #if 0
00334         for (int i = 0; i < 4; i++)
00335             DLOG("rect is (%d, %d) with %d x %d\n",
00336                     background[i].x,
00337                     background[i].y,
00338                     background[i].width,
00339                     background[i].height
00340                 );
00341 #endif
00342 
00343         xcb_change_gc_single(conn, con->pm_gc, XCB_GC_FOREGROUND, config.client.background);
00344         xcb_poly_fill_rectangle(conn, con->pixmap, con->pm_gc, sizeof(background) / sizeof(xcb_rectangle_t), background);
00345     }
00346 
00347     /* 3: draw a rectangle in border color around the client */
00348     if (p->border_style != BS_NONE && p->con_is_leaf) {
00349         Rect br = con_border_style_rect(con);
00350 #if 0
00351         DLOG("con->rect spans %d x %d\n", con->rect.width, con->rect.height);
00352         DLOG("border_rect spans (%d, %d) with %d x %d\n", br.x, br.y, br.width, br.height);
00353         DLOG("window_rect spans (%d, %d) with %d x %d\n", con->window_rect.x, con->window_rect.y, con->window_rect.width, con->window_rect.height);
00354 #endif
00355 
00356         /* These rectangles represents the border around the child window
00357          * (left, bottom and right part). We don’t just fill the whole
00358          * rectangle because some childs are not freely resizable and we want
00359          * their background color to "shine through". */
00360         xcb_change_gc_single(conn, con->pm_gc, XCB_GC_FOREGROUND, p->color->background);
00361         xcb_rectangle_t borders[] = {
00362             { 0, 0, br.x, r->height },
00363             { 0, r->height + br.height + br.y, r->width, r->height },
00364             { r->width + br.width + br.x, 0, r->width, r->height }
00365         };
00366         xcb_poly_fill_rectangle(conn, con->pixmap, con->pm_gc, 3, borders);
00367         /* 1pixel border needs an additional line at the top */
00368         if (p->border_style == BS_1PIXEL) {
00369             xcb_rectangle_t topline = { br.x, 0, con->rect.width + br.width + br.x, br.y };
00370             xcb_poly_fill_rectangle(conn, con->pixmap, con->pm_gc, 1, &topline);
00371         }
00372     }
00373 
00374     /* if this is a borderless/1pixel window, we don’t * need to render the
00375      * decoration. */
00376     if (p->border_style != BS_NORMAL) {
00377         DLOG("border style not BS_NORMAL, aborting rendering of decoration\n");
00378         goto copy_pixmaps;
00379     }
00380 
00381     /* 4: paint the bar */
00382     xcb_change_gc_single(conn, parent->pm_gc, XCB_GC_FOREGROUND, p->color->background);
00383     xcb_rectangle_t drect = { con->deco_rect.x, con->deco_rect.y, con->deco_rect.width, con->deco_rect.height };
00384     xcb_poly_fill_rectangle(conn, parent->pixmap, parent->pm_gc, 1, &drect);
00385 
00386     /* 5: draw two unconnected lines in border color */
00387     xcb_change_gc_single(conn, parent->pm_gc, XCB_GC_FOREGROUND, p->color->border);
00388     Rect *dr = &(con->deco_rect);
00389     xcb_segment_t segments[] = {
00390         { dr->x,             dr->y,
00391           dr->x + dr->width, dr->y },
00392 
00393         { dr->x,             dr->y + dr->height - 1,
00394           dr->x + dr->width, dr->y + dr->height - 1 }
00395     };
00396     xcb_poly_segment(conn, parent->pixmap, parent->pm_gc, 2, segments);
00397 
00398     /* 6: draw the title */
00399     uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT;
00400     uint32_t values[] = { p->color->text, p->color->background, config.font.id };
00401     xcb_change_gc(conn, parent->pm_gc, mask, values);
00402     int text_offset_y = config.font.height + (con->deco_rect.height - config.font.height) / 2 - 1;
00403 
00404     struct Window *win = con->window;
00405     if (win == NULL || win->name_x == NULL) {
00406         /* this is a non-leaf container, we need to make up a good description */
00407         // TODO: use a good description instead of just "another container"
00408         xcb_image_text_8(
00409             conn,
00410             strlen("another container"),
00411             parent->pixmap,
00412             parent->pm_gc,
00413             con->deco_rect.x + 2,
00414             con->deco_rect.y + text_offset_y,
00415             "another container"
00416         );
00417 
00418         goto copy_pixmaps;
00419     }
00420 
00421     int indent_level = 0,
00422         indent_mult = 0;
00423     Con *il_parent = parent;
00424     if (il_parent->layout != L_STACKED) {
00425         while (1) {
00426             DLOG("il_parent = %p, layout = %d\n", il_parent, il_parent->layout);
00427             if (il_parent->layout == L_STACKED)
00428                 indent_level++;
00429             if (il_parent->type == CT_WORKSPACE || il_parent->type == CT_DOCKAREA || il_parent->type == CT_OUTPUT)
00430                 break;
00431             il_parent = il_parent->parent;
00432             indent_mult++;
00433         }
00434     }
00435     DLOG("indent_level = %d, indent_mult = %d\n", indent_level, indent_mult);
00436     int indent_px = (indent_level * 5) * indent_mult;
00437 
00438     if (win->uses_net_wm_name)
00439         xcb_image_text_16(
00440             conn,
00441             win->name_len,
00442             parent->pixmap,
00443             parent->pm_gc,
00444             con->deco_rect.x + 2 + indent_px,
00445             con->deco_rect.y + text_offset_y,
00446             (xcb_char2b_t*)win->name_x
00447         );
00448     else
00449         xcb_image_text_8(
00450             conn,
00451             win->name_len,
00452             parent->pixmap,
00453             parent->pm_gc,
00454             con->deco_rect.x + 2 + indent_px,
00455             con->deco_rect.y + text_offset_y,
00456             win->name_x
00457         );
00458 
00459 copy_pixmaps:
00460     xcb_copy_area(conn, con->pixmap, con->frame, con->pm_gc, 0, 0, 0, 0, con->rect.width, con->rect.height);
00461 }
00462 
00463 /*
00464  * Recursively calls x_draw_decoration. This cannot be done in x_push_node
00465  * because x_push_node uses focus order to recurse (see the comment above)
00466  * while drawing the decoration needs to happen in the actual order.
00467  *
00468  */
00469 void x_deco_recurse(Con *con) {
00470     Con *current;
00471     bool leaf = TAILQ_EMPTY(&(con->nodes_head)) &&
00472                 TAILQ_EMPTY(&(con->floating_head));
00473     con_state *state = state_for_frame(con->frame);
00474 
00475     if (!leaf) {
00476         TAILQ_FOREACH(current, &(con->nodes_head), nodes)
00477             x_deco_recurse(current);
00478 
00479         TAILQ_FOREACH(current, &(con->floating_head), floating_windows)
00480             x_deco_recurse(current);
00481 
00482         if (state->mapped)
00483             xcb_copy_area(conn, con->pixmap, con->frame, con->pm_gc, 0, 0, 0, 0, con->rect.width, con->rect.height);
00484     }
00485 
00486     if ((con->type != CT_ROOT && con->type != CT_OUTPUT) &&
00487         con->mapped)
00488         x_draw_decoration(con);
00489 }
00490 
00491 /*
00492  * This function pushes the properties of each node of the layout tree to
00493  * X11 if they have changed (like the map state, position of the window, …).
00494  * It recursively traverses all children of the given node.
00495  *
00496  */
00497 void x_push_node(Con *con) {
00498     Con *current;
00499     con_state *state;
00500     Rect rect = con->rect;
00501 
00502     //DLOG("Pushing changes for node %p / %s\n", con, con->name);
00503     state = state_for_frame(con->frame);
00504 
00505     if (state->name != NULL) {
00506         DLOG("pushing name %s for con %p\n", state->name, con);
00507 
00508         xcb_change_property(conn, XCB_PROP_MODE_REPLACE, con->frame,
00509                             A_WM_NAME, A_STRING, 8, strlen(state->name), state->name);
00510         FREE(state->name);
00511     }
00512 
00513     if (con->window == NULL) {
00514         /* Calculate the height of all window decorations which will be drawn on to
00515          * this frame. */
00516         uint32_t max_y = 0, max_height = 0;
00517         TAILQ_FOREACH(current, &(con->nodes_head), nodes) {
00518             Rect *dr = &(current->deco_rect);
00519             if (dr->y >= max_y && dr->height >= max_height) {
00520                 max_y = dr->y;
00521                 max_height = dr->height;
00522             }
00523         }
00524         rect.height = max_y + max_height;
00525         if (rect.height == 0) {
00526             DLOG("Unmapping container %p because it does not contain anything.\n", con);
00527             con->mapped = false;
00528         }
00529     }
00530 
00531     /* reparent the child window (when the window was moved due to a sticky
00532      * container) */
00533     if (state->need_reparent && con->window != NULL) {
00534         DLOG("Reparenting child window\n");
00535 
00536         /* Temporarily set the event masks to XCB_NONE so that we won’t get
00537          * UnmapNotify events (otherwise the handler would close the container).
00538          * These events are generated automatically when reparenting. */
00539         uint32_t values[] = { XCB_NONE };
00540         xcb_change_window_attributes(conn, state->old_frame, XCB_CW_EVENT_MASK, values);
00541         xcb_change_window_attributes(conn, con->window->id, XCB_CW_EVENT_MASK, values);
00542 
00543         xcb_reparent_window(conn, con->window->id, con->frame, 0, 0);
00544 
00545         values[0] = FRAME_EVENT_MASK;
00546         xcb_change_window_attributes(conn, state->old_frame, XCB_CW_EVENT_MASK, values);
00547         values[0] = CHILD_EVENT_MASK;
00548         xcb_change_window_attributes(conn, con->window->id, XCB_CW_EVENT_MASK, values);
00549 
00550         state->old_frame = XCB_NONE;
00551         state->need_reparent = false;
00552 
00553         con->ignore_unmap++;
00554         DLOG("ignore_unmap for reparenting of con %p (win 0x%08x) is now %d\n",
00555                 con, con->window->id, con->ignore_unmap);
00556     }
00557 
00558     bool fake_notify = false;
00559     /* Set new position if rect changed (and if height > 0) */
00560     if (memcmp(&(state->rect), &rect, sizeof(Rect)) != 0 &&
00561         rect.height > 0) {
00562         /* We first create the new pixmap, then render to it, set it as the
00563          * background and only afterwards change the window size. This reduces
00564          * flickering. */
00565 
00566         /* As the pixmap only depends on the size and not on the position, it
00567          * is enough to check if width/height have changed. Also, we don’t
00568          * create a pixmap at all when the window is actually not visible
00569          * (height == 0). */
00570         if ((state->rect.width != rect.width ||
00571             state->rect.height != rect.height)) {
00572             DLOG("CACHE: creating new pixmap for con %p (old: %d x %d, new: %d x %d)\n",
00573                     con, state->rect.width, state->rect.height,
00574                     rect.width, rect.height);
00575             if (con->pixmap == 0) {
00576                 con->pixmap = xcb_generate_id(conn);
00577                 con->pm_gc = xcb_generate_id(conn);
00578             } else {
00579                 xcb_free_pixmap(conn, con->pixmap);
00580                 xcb_free_gc(conn, con->pm_gc);
00581             }
00582             xcb_create_pixmap(conn, root_depth, con->pixmap, con->frame, rect.width, rect.height);
00583             /* For the graphics context, we disable GraphicsExposure events.
00584              * Those will be sent when a CopyArea request cannot be fulfilled
00585              * properly due to parts of the source being unmapped or otherwise
00586              * unavailable. Since we always copy from pixmaps to windows, this
00587              * is not a concern for us. */
00588             uint32_t values[] = { 0 };
00589             xcb_create_gc(conn, con->pm_gc, con->pixmap, XCB_GC_GRAPHICS_EXPOSURES, values);
00590 
00591             con->pixmap_recreated = true;
00592 
00593             /* Don’t render the decoration for windows inside a stack which are
00594              * not visible right now */
00595             if (!con->parent ||
00596                 con->parent->layout != L_STACKED ||
00597                 TAILQ_FIRST(&(con->parent->focus_head)) == con)
00598                 /* Render the decoration now to make the correct decoration visible
00599                  * from the very first moment. Later calls will be cached, so this
00600                  * doesn’t hurt performance. */
00601                 x_deco_recurse(con);
00602         }
00603 
00604         DLOG("setting rect (%d, %d, %d, %d)\n", rect.x, rect.y, rect.width, rect.height);
00605         /* flush to ensure that the following commands are sent in a single
00606          * buffer and will be processed directly afterwards (the contents of a
00607          * window get lost when resizing it, therefore we want to provide it as
00608          * fast as possible) */
00609         xcb_flush(conn);
00610         xcb_set_window_rect(conn, con->frame, rect);
00611         if (con->pixmap != XCB_NONE)
00612             xcb_copy_area(conn, con->pixmap, con->frame, con->pm_gc, 0, 0, 0, 0, con->rect.width, con->rect.height);
00613         xcb_flush(conn);
00614 
00615         memcpy(&(state->rect), &rect, sizeof(Rect));
00616         fake_notify = true;
00617     }
00618 
00619     /* dito, but for child windows */
00620     if (con->window != NULL &&
00621         memcmp(&(state->window_rect), &(con->window_rect), sizeof(Rect)) != 0) {
00622         DLOG("setting window rect (%d, %d, %d, %d)\n",
00623             con->window_rect.x, con->window_rect.y, con->window_rect.width, con->window_rect.height);
00624         xcb_set_window_rect(conn, con->window->id, con->window_rect);
00625         memcpy(&(state->window_rect), &(con->window_rect), sizeof(Rect));
00626         fake_notify = true;
00627     }
00628 
00629     /* Map if map state changed, also ensure that the child window
00630      * is changed if we are mapped *and* in initial state (meaning the
00631      * container was empty before, but now got a child). Unmaps are handled in
00632      * x_push_node_unmaps(). */
00633     if ((state->mapped != con->mapped || (con->mapped && state->initial)) &&
00634         con->mapped) {
00635         xcb_void_cookie_t cookie;
00636 
00637         if (con->window != NULL) {
00638             /* Set WM_STATE_NORMAL because GTK applications don’t want to
00639              * drag & drop if we don’t. Also, xprop(1) needs it. */
00640             long data[] = { XCB_ICCCM_WM_STATE_NORMAL, XCB_NONE };
00641             xcb_change_property(conn, XCB_PROP_MODE_REPLACE, con->window->id,
00642                                 A_WM_STATE, A_WM_STATE, 32, 2, data);
00643         }
00644 
00645         uint32_t values[1];
00646         if (!state->child_mapped && con->window != NULL) {
00647             cookie = xcb_map_window(conn, con->window->id);
00648 
00649             /* We are interested in EnterNotifys as soon as the window is
00650              * mapped */
00651             values[0] = CHILD_EVENT_MASK;
00652             xcb_change_window_attributes(conn, con->window->id, XCB_CW_EVENT_MASK, values);
00653             DLOG("mapping child window (serial %d)\n", cookie.sequence);
00654             state->child_mapped = true;
00655         }
00656 
00657         cookie = xcb_map_window(conn, con->frame);
00658 
00659         values[0] = FRAME_EVENT_MASK;
00660         xcb_change_window_attributes(conn, con->frame, XCB_CW_EVENT_MASK, values);
00661 
00662         /* copy the pixmap contents to the frame window immediately after mapping */
00663         if (con->pixmap != XCB_NONE)
00664             xcb_copy_area(conn, con->pixmap, con->frame, con->pm_gc, 0, 0, 0, 0, con->rect.width, con->rect.height);
00665         xcb_flush(conn);
00666 
00667         DLOG("mapping container %08x (serial %d)\n", con->frame, cookie.sequence);
00668         state->mapped = con->mapped;
00669     }
00670 
00671     state->unmap_now = (state->mapped != con->mapped) && !con->mapped;
00672 
00673     if (fake_notify) {
00674         DLOG("Sending fake configure notify\n");
00675         fake_absolute_configure_notify(con);
00676     }
00677 
00678     /* Handle all children and floating windows of this node. We recurse
00679      * in focus order to display the focused client in a stack first when
00680      * switching workspaces (reduces flickering). */
00681     TAILQ_FOREACH(current, &(con->focus_head), focused)
00682         x_push_node(current);
00683 }
00684 
00685 /*
00686  * Same idea as in x_push_node(), but this function only unmaps windows. It is
00687  * necessary to split this up to handle new fullscreen clients properly: The
00688  * new window needs to be mapped and focus needs to be set *before* the
00689  * underlying windows are unmapped. Otherwise, focus will revert to the
00690  * PointerRoot and will then be set to the new window, generating unnecessary
00691  * FocusIn/FocusOut events.
00692  *
00693  */
00694 static void x_push_node_unmaps(Con *con) {
00695     Con *current;
00696     con_state *state;
00697 
00698     //DLOG("Pushing changes (with unmaps) for node %p / %s\n", con, con->name);
00699     state = state_for_frame(con->frame);
00700 
00701     /* map/unmap if map state changed, also ensure that the child window
00702      * is changed if we are mapped *and* in initial state (meaning the
00703      * container was empty before, but now got a child) */
00704     if (state->unmap_now) {
00705         xcb_void_cookie_t cookie;
00706         if (con->window != NULL) {
00707             /* Set WM_STATE_WITHDRAWN, it seems like Java apps need it */
00708             long data[] = { XCB_ICCCM_WM_STATE_WITHDRAWN, XCB_NONE };
00709             xcb_change_property(conn, XCB_PROP_MODE_REPLACE, con->window->id,
00710                                 A_WM_STATE, A_WM_STATE, 32, 2, data);
00711         }
00712 
00713         cookie = xcb_unmap_window(conn, con->frame);
00714         DLOG("unmapping container (serial %d)\n", cookie.sequence);
00715         /* we need to increase ignore_unmap for this container (if it
00716          * contains a window) and for every window "under" this one which
00717          * contains a window */
00718         if (con->window != NULL) {
00719             con->ignore_unmap++;
00720             DLOG("ignore_unmap for con %p (frame 0x%08x) now %d\n", con, con->frame, con->ignore_unmap);
00721         }
00722         state->mapped = con->mapped;
00723     }
00724 
00725     /* handle all children and floating windows of this node */
00726     TAILQ_FOREACH(current, &(con->nodes_head), nodes)
00727         x_push_node_unmaps(current);
00728 
00729     TAILQ_FOREACH(current, &(con->floating_head), floating_windows)
00730         x_push_node_unmaps(current);
00731 }
00732 
00733 /*
00734  * Pushes all changes (state of each node, see x_push_node() and the window
00735  * stack) to X11.
00736  *
00737  * NOTE: We need to push the stack first so that the windows have the correct
00738  * stacking order. This is relevant for workspace switching where we map the
00739  * windows because mapping may generate EnterNotify events. When they are
00740  * generated in the wrong order, this will cause focus problems when switching
00741  * workspaces.
00742  *
00743  */
00744 void x_push_changes(Con *con) {
00745     con_state *state;
00746 
00747     DLOG("-- PUSHING WINDOW STACK --\n");
00748     //DLOG("Disabling EnterNotify\n");
00749     uint32_t values[1] = { XCB_NONE };
00750     CIRCLEQ_FOREACH_REVERSE(state, &state_head, state) {
00751         if (state->mapped)
00752             xcb_change_window_attributes(conn, state->id, XCB_CW_EVENT_MASK, values);
00753     }
00754     //DLOG("Done, EnterNotify disabled\n");
00755     bool order_changed = false;
00756     /* X11 correctly represents the stack if we push it from bottom to top */
00757     CIRCLEQ_FOREACH_REVERSE(state, &state_head, state) {
00758         //DLOG("stack: 0x%08x\n", state->id);
00759         con_state *prev = CIRCLEQ_PREV(state, state);
00760         con_state *old_prev = CIRCLEQ_PREV(state, old_state);
00761         if (prev != old_prev)
00762             order_changed = true;
00763         if ((state->initial || order_changed) && prev != CIRCLEQ_END(&state_head)) {
00764             DLOG("Stacking 0x%08x above 0x%08x\n", prev->id, state->id);
00765             uint32_t mask = 0;
00766             mask |= XCB_CONFIG_WINDOW_SIBLING;
00767             mask |= XCB_CONFIG_WINDOW_STACK_MODE;
00768             uint32_t values[] = {state->id, XCB_STACK_MODE_ABOVE};
00769 
00770             xcb_configure_window(conn, prev->id, mask, values);
00771         }
00772         state->initial = false;
00773     }
00774     //DLOG("Re-enabling EnterNotify\n");
00775     values[0] = FRAME_EVENT_MASK;
00776     CIRCLEQ_FOREACH_REVERSE(state, &state_head, state) {
00777         if (state->mapped)
00778             xcb_change_window_attributes(conn, state->id, XCB_CW_EVENT_MASK, values);
00779     }
00780     //DLOG("Done, EnterNotify re-enabled\n");
00781 
00782     DLOG("\n\n PUSHING CHANGES\n\n");
00783     x_push_node(con);
00784     x_deco_recurse(con);
00785 
00786     xcb_window_t to_focus = focused->frame;
00787     if (focused->window != NULL)
00788         to_focus = focused->window->id;
00789 
00790     DLOG("focused_id = 0x%08x, to_focus = 0x%08x\n", focused_id, to_focus);
00791     if (focused_id != to_focus) {
00792         if (!focused->mapped) {
00793             DLOG("Not updating focus (to %p / %s), focused window is not mapped.\n", focused, focused->name);
00794             /* Invalidate focused_id to correctly focus new windows with the same ID */
00795             focused_id = XCB_NONE;
00796         } else {
00797             DLOG("Updating focus (focused: %p / %s)\n", focused, focused->name);
00798             /* We remove XCB_EVENT_MASK_FOCUS_CHANGE from the event mask to get
00799              * no focus change events for our own focus changes. We only want
00800              * these generated by the clients. */
00801             if (focused->window != NULL) {
00802                 values[0] = CHILD_EVENT_MASK & ~(XCB_EVENT_MASK_FOCUS_CHANGE);
00803                 xcb_change_window_attributes(conn, focused->window->id, XCB_CW_EVENT_MASK, values);
00804             }
00805             xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, to_focus, XCB_CURRENT_TIME);
00806             if (focused->window != NULL) {
00807                 values[0] = CHILD_EVENT_MASK;
00808                 xcb_change_window_attributes(conn, focused->window->id, XCB_CW_EVENT_MASK, values);
00809             }
00810 
00811             if (focused->window != NULL &&
00812                 focused->window->needs_take_focus) {
00813                 send_take_focus(to_focus);
00814             }
00815 
00816             ewmh_update_active_window(to_focus);
00817             focused_id = to_focus;
00818         }
00819     }
00820 
00821     if (focused_id == XCB_NONE) {
00822         DLOG("Still no window focused, better set focus to the root window\n");
00823         xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, root, XCB_CURRENT_TIME);
00824         focused_id = root;
00825     }
00826 
00827     xcb_flush(conn);
00828     DLOG("\n\n ENDING CHANGES\n\n");
00829 
00830     /* Disable EnterWindow events for windows which will be unmapped in
00831      * x_push_node_unmaps() now. Unmapping windows happens when switching
00832      * workspaces. We want to avoid getting EnterNotifies during that phase
00833      * because they would screw up our focus. One of these cases is having a
00834      * stack with two windows. If the first window is focused and gets
00835      * unmapped, the second one appears under the cursor and therefore gets an
00836      * EnterNotify event. */
00837     values[0] = FRAME_EVENT_MASK & ~XCB_EVENT_MASK_ENTER_WINDOW;
00838     CIRCLEQ_FOREACH_REVERSE(state, &state_head, state) {
00839         if (!state->unmap_now)
00840             continue;
00841         xcb_change_window_attributes(conn, state->id, XCB_CW_EVENT_MASK, values);
00842     }
00843 
00844     /* Push all pending unmaps */
00845     x_push_node_unmaps(con);
00846 
00847     /* save the current stack as old stack */
00848     CIRCLEQ_FOREACH(state, &state_head, state) {
00849         CIRCLEQ_REMOVE(&old_state_head, state, old_state);
00850         CIRCLEQ_INSERT_TAIL(&old_state_head, state, old_state);
00851     }
00852     //CIRCLEQ_FOREACH(state, &old_state_head, old_state) {
00853     //    DLOG("old stack: 0x%08x\n", state->id);
00854     //}
00855 
00856     xcb_flush(conn);
00857 }
00858 
00859 /*
00860  * Raises the specified container in the internal stack of X windows. The
00861  * next call to x_push_changes() will make the change visible in X11.
00862  *
00863  */
00864 void x_raise_con(Con *con) {
00865     con_state *state;
00866     state = state_for_frame(con->frame);
00867     //DLOG("raising in new stack: %p / %s / %s / xid %08x\n", con, con->name, con->window ? con->window->name_json : "", state->id);
00868 
00869     CIRCLEQ_REMOVE(&state_head, state, state);
00870     CIRCLEQ_INSERT_HEAD(&state_head, state, state);
00871 }
00872 
00873 /*
00874  * Sets the WM_NAME property (so, no UTF8, but used only for debugging anyways)
00875  * of the given name. Used for properly tagging the windows for easily spotting
00876  * i3 windows in xwininfo -root -all.
00877  *
00878  */
00879 void x_set_name(Con *con, const char *name) {
00880     struct con_state *state;
00881 
00882     if ((state = state_for_frame(con->frame)) == NULL) {
00883         ELOG("window state not found\n");
00884         return;
00885     }
00886 
00887     FREE(state->name);
00888     state->name = sstrdup(name);
00889 }
00890 
00891 /*
00892  * Sets up i3 specific atoms (I3_SOCKET_PATH and I3_CONFIG_PATH)
00893  *
00894  */
00895 void x_set_i3_atoms() {
00896     xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A_I3_SOCKET_PATH, A_UTF8_STRING, 8,
00897                         (current_socketpath == NULL ? 0 : strlen(current_socketpath)),
00898                         current_socketpath);
00899     xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A_I3_CONFIG_PATH, A_UTF8_STRING, 8,
00900                         strlen(current_configpath), current_configpath);
00901 }