i3
src/handlers.c
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00001 /*
00002  * vim:ts=4:sw=4:expandtab
00003  *
00004  * i3 - an improved dynamic tiling window manager
00005  * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
00006  *
00007  * handlers.c: Small handlers for various events (keypresses, focus changes,
00008  *             …).
00009  *
00010  */
00011 #include "all.h"
00012 
00013 #include <time.h>
00014 #include <xcb/randr.h>
00015 #include <X11/XKBlib.h>
00016 #define SN_API_NOT_YET_FROZEN 1
00017 #include <libsn/sn-monitor.h>
00018 
00019 int randr_base = -1;
00020 
00021 /* After mapping/unmapping windows, a notify event is generated. However, we don’t want it,
00022    since it’d trigger an infinite loop of switching between the different windows when
00023    changing workspaces */
00024 static SLIST_HEAD(ignore_head, Ignore_Event) ignore_events;
00025 
00026 /*
00027  * Adds the given sequence to the list of events which are ignored.
00028  * If this ignore should only affect a specific response_type, pass
00029  * response_type, otherwise, pass -1.
00030  *
00031  * Every ignored sequence number gets garbage collected after 5 seconds.
00032  *
00033  */
00034 void add_ignore_event(const int sequence, const int response_type) {
00035     struct Ignore_Event *event = smalloc(sizeof(struct Ignore_Event));
00036 
00037     event->sequence = sequence;
00038     event->response_type = response_type;
00039     event->added = time(NULL);
00040 
00041     SLIST_INSERT_HEAD(&ignore_events, event, ignore_events);
00042 }
00043 
00044 /*
00045  * Checks if the given sequence is ignored and returns true if so.
00046  *
00047  */
00048 bool event_is_ignored(const int sequence, const int response_type) {
00049     struct Ignore_Event *event;
00050     time_t now = time(NULL);
00051     for (event = SLIST_FIRST(&ignore_events); event != SLIST_END(&ignore_events);) {
00052         if ((now - event->added) > 5) {
00053             struct Ignore_Event *save = event;
00054             event = SLIST_NEXT(event, ignore_events);
00055             SLIST_REMOVE(&ignore_events, save, Ignore_Event, ignore_events);
00056             free(save);
00057         } else event = SLIST_NEXT(event, ignore_events);
00058     }
00059 
00060     SLIST_FOREACH(event, &ignore_events, ignore_events) {
00061         if (event->sequence != sequence)
00062             continue;
00063 
00064         if (event->response_type != -1 &&
00065             event->response_type != response_type)
00066             continue;
00067 
00068         /* instead of removing a sequence number we better wait until it gets
00069          * garbage collected. it may generate multiple events (there are multiple
00070          * enter_notifies for one configure_request, for example). */
00071         //SLIST_REMOVE(&ignore_events, event, Ignore_Event, ignore_events);
00072         //free(event);
00073         return true;
00074     }
00075 
00076     return false;
00077 }
00078 
00079 
00080 /*
00081  * There was a key press. We compare this key code with our bindings table and pass
00082  * the bound action to parse_command().
00083  *
00084  */
00085 static int handle_key_press(xcb_key_press_event_t *event) {
00086 
00087     last_timestamp = event->time;
00088 
00089     DLOG("Keypress %d, state raw = %d\n", event->detail, event->state);
00090 
00091     /* Remove the numlock bit, all other bits are modifiers we can bind to */
00092     uint16_t state_filtered = event->state & ~(xcb_numlock_mask | XCB_MOD_MASK_LOCK);
00093     DLOG("(removed numlock, state = %d)\n", state_filtered);
00094     /* Only use the lower 8 bits of the state (modifier masks) so that mouse
00095      * button masks are filtered out */
00096     state_filtered &= 0xFF;
00097     DLOG("(removed upper 8 bits, state = %d)\n", state_filtered);
00098 
00099     if (xkb_current_group == XkbGroup2Index)
00100         state_filtered |= BIND_MODE_SWITCH;
00101 
00102     DLOG("(checked mode_switch, state %d)\n", state_filtered);
00103 
00104     /* Find the binding */
00105     Binding *bind = get_binding(state_filtered, event->detail);
00106 
00107     /* No match? Then the user has Mode_switch enabled but does not have a
00108      * specific keybinding. Fall back to the default keybindings (without
00109      * Mode_switch). Makes it much more convenient for users of a hybrid
00110      * layout (like us, ru). */
00111     if (bind == NULL) {
00112         state_filtered &= ~(BIND_MODE_SWITCH);
00113         DLOG("no match, new state_filtered = %d\n", state_filtered);
00114         if ((bind = get_binding(state_filtered, event->detail)) == NULL) {
00115             ELOG("Could not lookup key binding (modifiers %d, keycode %d)\n",
00116                  state_filtered, event->detail);
00117             return 1;
00118         }
00119     }
00120 
00121     char *json_result = parse_cmd(bind->command);
00122     FREE(json_result);
00123     return 1;
00124 }
00125 
00126 /*
00127  * Called with coordinates of an enter_notify event or motion_notify event
00128  * to check if the user crossed virtual screen boundaries and adjust the
00129  * current workspace, if so.
00130  *
00131  */
00132 static void check_crossing_screen_boundary(uint32_t x, uint32_t y) {
00133     Output *output;
00134 
00135     /* If the user disable focus follows mouse, we have nothing to do here */
00136     if (config.disable_focus_follows_mouse)
00137         return;
00138 
00139     if ((output = get_output_containing(x, y)) == NULL) {
00140         ELOG("ERROR: No such screen\n");
00141         return;
00142     }
00143 
00144     if (output->con == NULL) {
00145         ELOG("ERROR: The screen is not recognized by i3 (no container associated)\n");
00146         return;
00147     }
00148 
00149     /* Focus the output on which the user moved his cursor */
00150     Con *old_focused = focused;
00151     Con *next = con_descend_focused(output_get_content(output->con));
00152     /* Since we are switching outputs, this *must* be a different workspace, so
00153      * call workspace_show() */
00154     workspace_show(con_get_workspace(next));
00155     con_focus(next);
00156 
00157     /* If the focus changed, we re-render to get updated decorations */
00158     if (old_focused != focused)
00159         tree_render();
00160 }
00161 
00162 /*
00163  * When the user moves the mouse pointer onto a window, this callback gets called.
00164  *
00165  */
00166 static int handle_enter_notify(xcb_enter_notify_event_t *event) {
00167     Con *con;
00168 
00169     last_timestamp = event->time;
00170 
00171     DLOG("enter_notify for %08x, mode = %d, detail %d, serial %d\n",
00172          event->event, event->mode, event->detail, event->sequence);
00173     DLOG("coordinates %d, %d\n", event->event_x, event->event_y);
00174     if (event->mode != XCB_NOTIFY_MODE_NORMAL) {
00175         DLOG("This was not a normal notify, ignoring\n");
00176         return 1;
00177     }
00178     /* Some events are not interesting, because they were not generated
00179      * actively by the user, but by reconfiguration of windows */
00180     if (event_is_ignored(event->sequence, XCB_ENTER_NOTIFY)) {
00181         DLOG("Event ignored\n");
00182         return 1;
00183     }
00184 
00185     bool enter_child = false;
00186     /* Get container by frame or by child window */
00187     if ((con = con_by_frame_id(event->event)) == NULL) {
00188         con = con_by_window_id(event->event);
00189         enter_child = true;
00190     }
00191 
00192     /* If not, then the user moved his cursor to the root window. In that case, we adjust c_ws */
00193     if (con == NULL) {
00194         DLOG("Getting screen at %d x %d\n", event->root_x, event->root_y);
00195         check_crossing_screen_boundary(event->root_x, event->root_y);
00196         return 1;
00197     }
00198 
00199     if (con->parent->type == CT_DOCKAREA) {
00200         DLOG("Ignoring, this is a dock client\n");
00201         return 1;
00202     }
00203 
00204     /* see if the user entered the window on a certain window decoration */
00205     int layout = (enter_child ? con->parent->layout : con->layout);
00206     if (layout == L_DEFAULT) {
00207         Con *child;
00208         TAILQ_FOREACH(child, &(con->nodes_head), nodes)
00209             if (rect_contains(child->deco_rect, event->event_x, event->event_y)) {
00210                 LOG("using child %p / %s instead!\n", child, child->name);
00211                 con = child;
00212                 break;
00213             }
00214     }
00215 
00216 #if 0
00217     if (client->workspace != c_ws && client->workspace->output == c_ws->output) {
00218             /* This can happen when a client gets assigned to a different workspace than
00219              * the current one (see src/mainx.c:reparent_window). Shortly after it was created,
00220              * an enter_notify will follow. */
00221             DLOG("enter_notify for a client on a different workspace but the same screen, ignoring\n");
00222             return 1;
00223     }
00224 #endif
00225 
00226     if (config.disable_focus_follows_mouse)
00227         return 1;
00228 
00229     /* Get the currently focused workspace to check if the focus change also
00230      * involves changing workspaces. If so, we need to call workspace_show() to
00231      * correctly update state and send the IPC event. */
00232     Con *ws = con_get_workspace(con);
00233     if (ws != con_get_workspace(focused))
00234         workspace_show(ws);
00235 
00236     con_focus(con_descend_focused(con));
00237     tree_render();
00238 
00239     return 1;
00240 }
00241 
00242 /*
00243  * When the user moves the mouse but does not change the active window
00244  * (e.g. when having no windows opened but moving mouse on the root screen
00245  * and crossing virtual screen boundaries), this callback gets called.
00246  *
00247  */
00248 static int handle_motion_notify(xcb_motion_notify_event_t *event) {
00249 
00250     last_timestamp = event->time;
00251 
00252     /* Skip events where the pointer was over a child window, we are only
00253      * interested in events on the root window. */
00254     if (event->child != 0)
00255         return 1;
00256 
00257     Con *con;
00258     if ((con = con_by_frame_id(event->event)) == NULL) {
00259         check_crossing_screen_boundary(event->root_x, event->root_y);
00260         return 1;
00261     }
00262 
00263     if (config.disable_focus_follows_mouse)
00264         return 1;
00265 
00266     if (con->layout != L_DEFAULT)
00267         return 1;
00268 
00269     /* see over which rect the user is */
00270     Con *current;
00271     TAILQ_FOREACH(current, &(con->nodes_head), nodes) {
00272         if (!rect_contains(current->deco_rect, event->event_x, event->event_y))
00273             continue;
00274 
00275         /* We found the rect, let’s see if this window is focused */
00276         if (TAILQ_FIRST(&(con->focus_head)) == current)
00277             return 1;
00278 
00279         con_focus(current);
00280         x_push_changes(croot);
00281         return 1;
00282     }
00283 
00284     return 1;
00285 }
00286 
00287 /*
00288  * Called when the keyboard mapping changes (for example by using Xmodmap),
00289  * we need to update our key bindings then (re-translate symbols).
00290  *
00291  */
00292 static int handle_mapping_notify(xcb_mapping_notify_event_t *event) {
00293     if (event->request != XCB_MAPPING_KEYBOARD &&
00294         event->request != XCB_MAPPING_MODIFIER)
00295         return 0;
00296 
00297     DLOG("Received mapping_notify for keyboard or modifier mapping, re-grabbing keys\n");
00298     xcb_refresh_keyboard_mapping(keysyms, event);
00299 
00300     xcb_numlock_mask = aio_get_mod_mask_for(XCB_NUM_LOCK, keysyms);
00301 
00302     ungrab_all_keys(conn);
00303     translate_keysyms();
00304     grab_all_keys(conn, false);
00305 
00306     return 0;
00307 }
00308 
00309 /*
00310  * A new window appeared on the screen (=was mapped), so let’s manage it.
00311  *
00312  */
00313 static int handle_map_request(xcb_map_request_event_t *event) {
00314     xcb_get_window_attributes_cookie_t cookie;
00315 
00316     cookie = xcb_get_window_attributes_unchecked(conn, event->window);
00317 
00318     DLOG("window = 0x%08x, serial is %d.\n", event->window, event->sequence);
00319     add_ignore_event(event->sequence, -1);
00320 
00321     manage_window(event->window, cookie, false);
00322     x_push_changes(croot);
00323     return 1;
00324 }
00325 
00326 /*
00327  * Configure requests are received when the application wants to resize windows on their own.
00328  *
00329  * We generate a synthethic configure notify event to signalize the client its "new" position.
00330  *
00331  */
00332 static int handle_configure_request(xcb_configure_request_event_t *event) {
00333     Con *con;
00334 
00335     DLOG("window 0x%08x wants to be at %dx%d with %dx%d\n",
00336         event->window, event->x, event->y, event->width, event->height);
00337 
00338     /* For unmanaged windows, we just execute the configure request. As soon as
00339      * it gets mapped, we will take over anyways. */
00340     if ((con = con_by_window_id(event->window)) == NULL) {
00341         DLOG("Configure request for unmanaged window, can do that.\n");
00342 
00343         uint32_t mask = 0;
00344         uint32_t values[7];
00345         int c = 0;
00346 #define COPY_MASK_MEMBER(mask_member, event_member) do { \
00347         if (event->value_mask & mask_member) { \
00348             mask |= mask_member; \
00349             values[c++] = event->event_member; \
00350         } \
00351 } while (0)
00352 
00353         COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_X, x);
00354         COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_Y, y);
00355         COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_WIDTH, width);
00356         COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_HEIGHT, height);
00357         COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_BORDER_WIDTH, border_width);
00358         COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_SIBLING, sibling);
00359         COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_STACK_MODE, stack_mode);
00360 
00361         xcb_configure_window(conn, event->window, mask, values);
00362         xcb_flush(conn);
00363 
00364         return 1;
00365     }
00366 
00367     DLOG("Configure request!\n");
00368     if (con_is_floating(con) && con_is_leaf(con)) {
00369         /* find the height for the decorations */
00370         int deco_height = config.font.height + 5;
00371         /* we actually need to apply the size/position changes to the *parent*
00372          * container */
00373         Rect bsr = con_border_style_rect(con);
00374         if (con->border_style == BS_NORMAL) {
00375             bsr.y += deco_height;
00376             bsr.height -= deco_height;
00377         }
00378         Con *floatingcon = con->parent;
00379 
00380         Rect newrect = floatingcon->rect;
00381 
00382         if (event->value_mask & XCB_CONFIG_WINDOW_X) {
00383             newrect.x = event->x + (-1) * bsr.x;
00384             DLOG("proposed x = %d, new x is %d\n", event->x, newrect.x);
00385         }
00386         if (event->value_mask & XCB_CONFIG_WINDOW_Y) {
00387             newrect.y = event->y + (-1) * bsr.y;
00388             DLOG("proposed y = %d, new y is %d\n", event->y, newrect.y);
00389         }
00390         if (event->value_mask & XCB_CONFIG_WINDOW_WIDTH) {
00391             newrect.width = event->width + (-1) * bsr.width;
00392             newrect.width += con->border_width * 2;
00393             DLOG("proposed width = %d, new width is %d (x11 border %d)\n",
00394                  event->width, newrect.width, con->border_width);
00395         }
00396         if (event->value_mask & XCB_CONFIG_WINDOW_HEIGHT) {
00397             newrect.height = event->height + (-1) * bsr.height;
00398             newrect.height += con->border_width * 2;
00399             DLOG("proposed height = %d, new height is %d (x11 border %d)\n",
00400                  event->height, newrect.height, con->border_width);
00401         }
00402 
00403         DLOG("Container is a floating leaf node, will do that.\n");
00404         floating_reposition(floatingcon, newrect);
00405         return 1;
00406     }
00407 
00408     /* Dock windows can be reconfigured in their height */
00409     if (con->parent && con->parent->type == CT_DOCKAREA) {
00410         DLOG("Dock window, only height reconfiguration allowed\n");
00411         if (event->value_mask & XCB_CONFIG_WINDOW_HEIGHT) {
00412             DLOG("Height given, changing\n");
00413 
00414             con->geometry.height = event->height;
00415             tree_render();
00416         }
00417     }
00418 
00419     fake_absolute_configure_notify(con);
00420 
00421     return 1;
00422 }
00423 #if 0
00424 
00425 /*
00426  * Configuration notifies are only handled because we need to set up ignore for
00427  * the following enter notify events.
00428  *
00429  */
00430 int handle_configure_event(void *prophs, xcb_connection_t *conn, xcb_configure_notify_event_t *event) {
00431     DLOG("configure_event, sequence %d\n", event->sequence);
00432         /* We ignore this sequence twice because events for child and frame should be ignored */
00433         add_ignore_event(event->sequence);
00434         add_ignore_event(event->sequence);
00435 
00436         return 1;
00437 }
00438 #endif
00439 
00440 /*
00441  * Gets triggered upon a RandR screen change event, that is when the user
00442  * changes the screen configuration in any way (mode, position, …)
00443  *
00444  */
00445 static int handle_screen_change(xcb_generic_event_t *e) {
00446     DLOG("RandR screen change\n");
00447 
00448     randr_query_outputs();
00449 
00450     ipc_send_event("output", I3_IPC_EVENT_OUTPUT, "{\"change\":\"unspecified\"}");
00451 
00452     return 1;
00453 }
00454 
00455 /*
00456  * Our window decorations were unmapped. That means, the window will be killed
00457  * now, so we better clean up before.
00458  *
00459  */
00460 static void handle_unmap_notify_event(xcb_unmap_notify_event_t *event) {
00461     DLOG("UnmapNotify for 0x%08x (received from 0x%08x), serial %d\n", event->window, event->event, event->sequence);
00462     xcb_get_input_focus_cookie_t cookie;
00463     Con *con = con_by_window_id(event->window);
00464     if (con == NULL) {
00465         /* This could also be an UnmapNotify for the frame. We need to
00466          * decrement the ignore_unmap counter. */
00467         con = con_by_frame_id(event->window);
00468         if (con == NULL) {
00469             LOG("Not a managed window, ignoring UnmapNotify event\n");
00470             return;
00471         }
00472 
00473         if (con->ignore_unmap > 0)
00474             con->ignore_unmap--;
00475         /* See the end of this function. */
00476         cookie = xcb_get_input_focus(conn);
00477         DLOG("ignore_unmap = %d for frame of container %p\n", con->ignore_unmap, con);
00478         goto ignore_end;
00479     }
00480 
00481     /* See the end of this function. */
00482     cookie = xcb_get_input_focus(conn);
00483 
00484     if (con->ignore_unmap > 0) {
00485         DLOG("ignore_unmap = %d, dec\n", con->ignore_unmap);
00486         con->ignore_unmap--;
00487         goto ignore_end;
00488     }
00489 
00490     tree_close(con, DONT_KILL_WINDOW, false, false);
00491     tree_render();
00492     x_push_changes(croot);
00493 
00494 ignore_end:
00495     /* If the client (as opposed to i3) destroyed or unmapped a window, an
00496      * EnterNotify event will follow (indistinguishable from an EnterNotify
00497      * event caused by moving your mouse), causing i3 to set focus to whichever
00498      * window is now visible.
00499      *
00500      * In a complex stacked or tabbed layout (take two v-split containers in a
00501      * tabbed container), when the bottom window in tab2 is closed, the bottom
00502      * window of tab1 is visible instead. X11 will thus send an EnterNotify
00503      * event for the bottom window of tab1, while the focus should be set to
00504      * the remaining window of tab2.
00505      *
00506      * Therefore, we ignore all EnterNotify events which have the same sequence
00507      * as an UnmapNotify event. */
00508     add_ignore_event(event->sequence, XCB_ENTER_NOTIFY);
00509 
00510     /* Since we just ignored the sequence of this UnmapNotify, we want to make
00511      * sure that following events use a different sequence. When putting xterm
00512      * into fullscreen and moving the pointer to a different window, without
00513      * using GetInputFocus, subsequent (legitimate) EnterNotify events arrived
00514      * with the same sequence and thus were ignored (see ticket #609). */
00515     free(xcb_get_input_focus_reply(conn, cookie, NULL));
00516 }
00517 
00518 /*
00519  * A destroy notify event is sent when the window is not unmapped, but
00520  * immediately destroyed (for example when starting a window and immediately
00521  * killing the program which started it).
00522  *
00523  * We just pass on the event to the unmap notify handler (by copying the
00524  * important fields in the event data structure).
00525  *
00526  */
00527 static void handle_destroy_notify_event(xcb_destroy_notify_event_t *event) {
00528     DLOG("destroy notify for 0x%08x, 0x%08x\n", event->event, event->window);
00529 
00530     xcb_unmap_notify_event_t unmap;
00531     unmap.sequence = event->sequence;
00532     unmap.event = event->event;
00533     unmap.window = event->window;
00534 
00535     handle_unmap_notify_event(&unmap);
00536 }
00537 
00538 /*
00539  * Called when a window changes its title
00540  *
00541  */
00542 static bool handle_windowname_change(void *data, xcb_connection_t *conn, uint8_t state,
00543                                 xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
00544     Con *con;
00545     if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
00546         return false;
00547 
00548     window_update_name(con->window, prop, false);
00549 
00550     x_push_changes(croot);
00551 
00552     return true;
00553 }
00554 
00555 /*
00556  * Handles legacy window name updates (WM_NAME), see also src/window.c,
00557  * window_update_name_legacy().
00558  *
00559  */
00560 static bool handle_windowname_change_legacy(void *data, xcb_connection_t *conn, uint8_t state,
00561                                 xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
00562     Con *con;
00563     if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
00564         return false;
00565 
00566     window_update_name_legacy(con->window, prop, false);
00567 
00568     x_push_changes(croot);
00569 
00570     return true;
00571 }
00572 
00573 /*
00574  * Called when a window changes its WM_WINDOW_ROLE.
00575  *
00576  */
00577 static bool handle_windowrole_change(void *data, xcb_connection_t *conn, uint8_t state,
00578                                      xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
00579     Con *con;
00580     if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
00581         return false;
00582 
00583     window_update_role(con->window, prop, false);
00584 
00585     return true;
00586 }
00587 
00588 #if 0
00589 /*
00590  * Updates the client’s WM_CLASS property
00591  *
00592  */
00593 static int handle_windowclass_change(void *data, xcb_connection_t *conn, uint8_t state,
00594                              xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
00595     Con *con;
00596     if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
00597         return 1;
00598 
00599     window_update_class(con->window, prop, false);
00600 
00601     return 0;
00602 }
00603 #endif
00604 
00605 /*
00606  * Expose event means we should redraw our windows (= title bar)
00607  *
00608  */
00609 static int handle_expose_event(xcb_expose_event_t *event) {
00610     Con *parent;
00611 
00612     /* event->count is the number of minimum remaining expose events for this
00613      * window, so we skip all events but the last one */
00614     if (event->count != 0)
00615         return 1;
00616 
00617     DLOG("window = %08x\n", event->window);
00618 
00619     if ((parent = con_by_frame_id(event->window)) == NULL) {
00620         LOG("expose event for unknown window, ignoring\n");
00621         return 1;
00622     }
00623 
00624     /* re-render the parent (recursively, if it’s a split con) */
00625     x_deco_recurse(parent);
00626     xcb_flush(conn);
00627 
00628     return 1;
00629 }
00630 
00631 /*
00632  * Handle client messages (EWMH)
00633  *
00634  */
00635 static void handle_client_message(xcb_client_message_event_t *event) {
00636     /* If this is a startup notification ClientMessage, the library will handle
00637      * it and call our monitor_event() callback. */
00638     if (sn_xcb_display_process_event(sndisplay, (xcb_generic_event_t*)event))
00639         return;
00640 
00641     LOG("ClientMessage for window 0x%08x\n", event->window);
00642     if (event->type == A__NET_WM_STATE) {
00643         if (event->format != 32 || event->data.data32[1] != A__NET_WM_STATE_FULLSCREEN) {
00644             DLOG("atom in clientmessage is %d, fullscreen is %d\n",
00645                     event->data.data32[1], A__NET_WM_STATE_FULLSCREEN);
00646             DLOG("not about fullscreen atom\n");
00647             return;
00648         }
00649 
00650         Con *con = con_by_window_id(event->window);
00651         if (con == NULL) {
00652             DLOG("Could not get window for client message\n");
00653             return;
00654         }
00655 
00656         /* Check if the fullscreen state should be toggled */
00657         if ((con->fullscreen_mode != CF_NONE &&
00658              (event->data.data32[0] == _NET_WM_STATE_REMOVE ||
00659               event->data.data32[0] == _NET_WM_STATE_TOGGLE)) ||
00660             (con->fullscreen_mode == CF_NONE &&
00661              (event->data.data32[0] == _NET_WM_STATE_ADD ||
00662               event->data.data32[0] == _NET_WM_STATE_TOGGLE))) {
00663             DLOG("toggling fullscreen\n");
00664             con_toggle_fullscreen(con, CF_OUTPUT);
00665         }
00666 
00667         tree_render();
00668         x_push_changes(croot);
00669     } else if (event->type == A_I3_SYNC) {
00670         DLOG("i3 sync, yay\n");
00671         xcb_window_t window = event->data.data32[0];
00672         uint32_t rnd = event->data.data32[1];
00673         DLOG("Sending random value %d back to X11 window 0x%08x\n", rnd, window);
00674 
00675         void *reply = scalloc(32);
00676         xcb_client_message_event_t *ev = reply;
00677 
00678         ev->response_type = XCB_CLIENT_MESSAGE;
00679         ev->window = window;
00680         ev->type = A_I3_SYNC;
00681         ev->format = 32;
00682         ev->data.data32[0] = window;
00683         ev->data.data32[1] = rnd;
00684 
00685         xcb_send_event(conn, false, window, XCB_EVENT_MASK_NO_EVENT, (char*)ev);
00686         xcb_flush(conn);
00687         free(reply);
00688     } else {
00689         DLOG("unhandled clientmessage\n");
00690         return;
00691     }
00692 }
00693 
00694 #if 0
00695 int handle_window_type(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
00696                         xcb_atom_t atom, xcb_get_property_reply_t *property) {
00697         /* TODO: Implement this one. To do this, implement a little test program which sleep(1)s
00698          before changing this property. */
00699         ELOG("_NET_WM_WINDOW_TYPE changed, this is not yet implemented.\n");
00700         return 0;
00701 }
00702 #endif
00703 
00704 /*
00705  * Handles the size hints set by a window, but currently only the part necessary for displaying
00706  * clients proportionally inside their frames (mplayer for example)
00707  *
00708  * See ICCCM 4.1.2.3 for more details
00709  *
00710  */
00711 static bool handle_normal_hints(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
00712                         xcb_atom_t name, xcb_get_property_reply_t *reply) {
00713     Con *con = con_by_window_id(window);
00714     if (con == NULL) {
00715         DLOG("Received WM_NORMAL_HINTS for unknown client\n");
00716         return false;
00717     }
00718 
00719     xcb_size_hints_t size_hints;
00720 
00721         //CLIENT_LOG(client);
00722 
00723     /* If the hints were already in this event, use them, if not, request them */
00724     if (reply != NULL)
00725         xcb_icccm_get_wm_size_hints_from_reply(&size_hints, reply);
00726     else
00727         xcb_icccm_get_wm_normal_hints_reply(conn, xcb_icccm_get_wm_normal_hints_unchecked(conn, con->window->id), &size_hints, NULL);
00728 
00729     if ((size_hints.flags & XCB_ICCCM_SIZE_HINT_P_MIN_SIZE)) {
00730         // TODO: Minimum size is not yet implemented
00731         DLOG("Minimum size: %d (width) x %d (height)\n", size_hints.min_width, size_hints.min_height);
00732     }
00733 
00734     bool changed = false;
00735     if ((size_hints.flags & XCB_ICCCM_SIZE_HINT_P_RESIZE_INC)) {
00736         if (size_hints.width_inc > 0 && size_hints.width_inc < 0xFFFF)
00737             if (con->width_increment != size_hints.width_inc) {
00738                 con->width_increment = size_hints.width_inc;
00739                 changed = true;
00740             }
00741         if (size_hints.height_inc > 0 && size_hints.height_inc < 0xFFFF)
00742             if (con->height_increment != size_hints.height_inc) {
00743                 con->height_increment = size_hints.height_inc;
00744                 changed = true;
00745             }
00746 
00747         if (changed)
00748             DLOG("resize increments changed\n");
00749     }
00750 
00751     int base_width = 0, base_height = 0;
00752 
00753     /* base_width/height are the desired size of the window.
00754        We check if either the program-specified size or the program-specified
00755        min-size is available */
00756     if (size_hints.flags & XCB_ICCCM_SIZE_HINT_BASE_SIZE) {
00757         base_width = size_hints.base_width;
00758         base_height = size_hints.base_height;
00759     } else if (size_hints.flags & XCB_ICCCM_SIZE_HINT_P_MIN_SIZE) {
00760         /* TODO: is this right? icccm says not */
00761         base_width = size_hints.min_width;
00762         base_height = size_hints.min_height;
00763     }
00764 
00765     if (base_width != con->base_width ||
00766         base_height != con->base_height) {
00767         con->base_width = base_width;
00768         con->base_height = base_height;
00769         DLOG("client's base_height changed to %d\n", base_height);
00770         DLOG("client's base_width changed to %d\n", base_width);
00771         changed = true;
00772     }
00773 
00774     /* If no aspect ratio was set or if it was invalid, we ignore the hints */
00775     if (!(size_hints.flags & XCB_ICCCM_SIZE_HINT_P_ASPECT) ||
00776         (size_hints.min_aspect_num <= 0) ||
00777         (size_hints.min_aspect_den <= 0)) {
00778         goto render_and_return;
00779     }
00780 
00781     /* XXX: do we really use rect here, not window_rect? */
00782     double width = con->rect.width - base_width;
00783     double height = con->rect.height - base_height;
00784     /* Convert numerator/denominator to a double */
00785     double min_aspect = (double)size_hints.min_aspect_num / size_hints.min_aspect_den;
00786     double max_aspect = (double)size_hints.max_aspect_num / size_hints.min_aspect_den;
00787 
00788     DLOG("Aspect ratio set: minimum %f, maximum %f\n", min_aspect, max_aspect);
00789     DLOG("width = %f, height = %f\n", width, height);
00790 
00791     /* Sanity checks, this is user-input, in a way */
00792     if (max_aspect <= 0 || min_aspect <= 0 || height == 0 || (width / height) <= 0)
00793         goto render_and_return;
00794 
00795     /* Check if we need to set proportional_* variables using the correct ratio */
00796     if ((width / height) < min_aspect) {
00797         if (con->proportional_width != width ||
00798             con->proportional_height != (width / min_aspect)) {
00799             con->proportional_width = width;
00800             con->proportional_height = width / min_aspect;
00801             changed = true;
00802         }
00803     } else if ((width / height) > max_aspect) {
00804         if (con->proportional_width != width ||
00805             con->proportional_height != (width / max_aspect)) {
00806             con->proportional_width = width;
00807             con->proportional_height = width / max_aspect;
00808             changed = true;
00809         }
00810     } else goto render_and_return;
00811 
00812 render_and_return:
00813     if (changed)
00814         tree_render();
00815     FREE(reply);
00816     return true;
00817 }
00818 
00819 /*
00820  * Handles the WM_HINTS property for extracting the urgency state of the window.
00821  *
00822  */
00823 static bool handle_hints(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
00824                   xcb_atom_t name, xcb_get_property_reply_t *reply) {
00825     Con *con = con_by_window_id(window);
00826     if (con == NULL) {
00827         DLOG("Received WM_HINTS for unknown client\n");
00828         return false;
00829     }
00830 
00831     xcb_icccm_wm_hints_t hints;
00832 
00833     if (reply == NULL)
00834         if (!(reply = xcb_get_property_reply(conn, xcb_icccm_get_wm_hints(conn, window), NULL)))
00835             return false;
00836 
00837     if (!xcb_icccm_get_wm_hints_from_reply(&hints, reply))
00838         return false;
00839 
00840     if (!con->urgent && focused == con) {
00841         DLOG("Ignoring urgency flag for current client\n");
00842         goto end;
00843     }
00844 
00845     /* Update the flag on the client directly */
00846     con->urgent = (xcb_icccm_wm_hints_get_urgency(&hints) != 0);
00847     //CLIENT_LOG(con);
00848     LOG("Urgency flag changed to %d\n", con->urgent);
00849 
00850     Con *ws;
00851     /* Set the urgency flag on the workspace, if a workspace could be found
00852      * (for dock clients, that is not the case). */
00853     if ((ws = con_get_workspace(con)) != NULL)
00854         workspace_update_urgent_flag(ws);
00855 
00856     tree_render();
00857 
00858 end:
00859     if (con->window)
00860         window_update_hints(con->window, reply);
00861     else free(reply);
00862     return true;
00863 }
00864 
00865 /*
00866  * Handles the transient for hints set by a window, signalizing that this window is a popup window
00867  * for some other window.
00868  *
00869  * See ICCCM 4.1.2.6 for more details
00870  *
00871  */
00872 static bool handle_transient_for(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
00873                          xcb_atom_t name, xcb_get_property_reply_t *prop) {
00874     Con *con;
00875 
00876     if ((con = con_by_window_id(window)) == NULL || con->window == NULL) {
00877         DLOG("No such window\n");
00878         return false;
00879     }
00880 
00881     if (prop == NULL) {
00882         prop = xcb_get_property_reply(conn, xcb_get_property_unchecked(conn,
00883                                 false, window, XCB_ATOM_WM_TRANSIENT_FOR, XCB_ATOM_WINDOW, 0, 32), NULL);
00884         if (prop == NULL)
00885             return false;
00886     }
00887 
00888     window_update_transient_for(con->window, prop);
00889 
00890     // TODO: put window in floating mode if con->window->transient_for != XCB_NONE:
00891 #if 0
00892     if (client->floating == FLOATING_AUTO_OFF) {
00893         DLOG("This is a popup window, putting into floating\n");
00894         toggle_floating_mode(conn, client, true);
00895     }
00896 #endif
00897 
00898     return true;
00899 }
00900 
00901 /*
00902  * Handles changes of the WM_CLIENT_LEADER atom which specifies if this is a
00903  * toolwindow (or similar) and to which window it belongs (logical parent).
00904  *
00905  */
00906 static bool handle_clientleader_change(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
00907                         xcb_atom_t name, xcb_get_property_reply_t *prop) {
00908     Con *con;
00909     if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
00910         return false;
00911 
00912     if (prop == NULL) {
00913         prop = xcb_get_property_reply(conn, xcb_get_property_unchecked(conn,
00914                                 false, window, A_WM_CLIENT_LEADER, XCB_ATOM_WINDOW, 0, 32), NULL);
00915         if (prop == NULL)
00916             return false;
00917     }
00918 
00919     window_update_leader(con->window, prop);
00920 
00921     return true;
00922 }
00923 
00924 /*
00925  * Handles FocusIn events which are generated by clients (i3’s focus changes
00926  * don’t generate FocusIn events due to a different EventMask) and updates the
00927  * decorations accordingly.
00928  *
00929  */
00930 static int handle_focus_in(xcb_focus_in_event_t *event) {
00931     DLOG("focus change in, for window 0x%08x\n", event->event);
00932     Con *con;
00933     if ((con = con_by_window_id(event->event)) == NULL || con->window == NULL)
00934         return 1;
00935     DLOG("That is con %p / %s\n", con, con->name);
00936 
00937     if (event->mode == XCB_NOTIFY_MODE_GRAB ||
00938         event->mode == XCB_NOTIFY_MODE_UNGRAB) {
00939         DLOG("FocusIn event for grab/ungrab, ignoring\n");
00940         return 1;
00941     }
00942 
00943     if (event->detail == XCB_NOTIFY_DETAIL_POINTER) {
00944         DLOG("notify detail is pointer, ignoring this event\n");
00945         return 1;
00946     }
00947 
00948     if (focused_id == event->event) {
00949         DLOG("focus matches the currently focused window, not doing anything\n");
00950         return 1;
00951     }
00952 
00953     /* Skip dock clients, they cannot get the i3 focus. */
00954     if (con->parent->type == CT_DOCKAREA) {
00955         DLOG("This is a dock client, not focusing.\n");
00956         return 1;
00957     }
00958 
00959     DLOG("focus is different, updating decorations\n");
00960 
00961     /* Get the currently focused workspace to check if the focus change also
00962      * involves changing workspaces. If so, we need to call workspace_show() to
00963      * correctly update state and send the IPC event. */
00964     Con *ws = con_get_workspace(con);
00965     if (ws != con_get_workspace(focused))
00966         workspace_show(ws);
00967 
00968     con_focus(con);
00969     /* We update focused_id because we don’t need to set focus again */
00970     focused_id = event->event;
00971     x_push_changes(croot);
00972     return 1;
00973 }
00974 
00975 /* Returns false if the event could not be processed (e.g. the window could not
00976  * be found), true otherwise */
00977 typedef bool (*cb_property_handler_t)(void *data, xcb_connection_t *c, uint8_t state, xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *property);
00978 
00979 struct property_handler_t {
00980     xcb_atom_t atom;
00981     uint32_t long_len;
00982     cb_property_handler_t cb;
00983 };
00984 
00985 static struct property_handler_t property_handlers[] = {
00986     { 0, 128, handle_windowname_change },
00987     { 0, UINT_MAX, handle_hints },
00988     { 0, 128, handle_windowname_change_legacy },
00989     { 0, UINT_MAX, handle_normal_hints },
00990     { 0, UINT_MAX, handle_clientleader_change },
00991     { 0, UINT_MAX, handle_transient_for },
00992     { 0, 128, handle_windowrole_change }
00993 };
00994 #define NUM_HANDLERS (sizeof(property_handlers) / sizeof(struct property_handler_t))
00995 
00996 /*
00997  * Sets the appropriate atoms for the property handlers after the atoms were
00998  * received from X11
00999  *
01000  */
01001 void property_handlers_init() {
01002 
01003     sn_monitor_context_new(sndisplay, conn_screen, startup_monitor_event, NULL, NULL);
01004 
01005     property_handlers[0].atom = A__NET_WM_NAME;
01006     property_handlers[1].atom = XCB_ATOM_WM_HINTS;
01007     property_handlers[2].atom = XCB_ATOM_WM_NAME;
01008     property_handlers[3].atom = XCB_ATOM_WM_NORMAL_HINTS;
01009     property_handlers[4].atom = A_WM_CLIENT_LEADER;
01010     property_handlers[5].atom = XCB_ATOM_WM_TRANSIENT_FOR;
01011     property_handlers[6].atom = A_WM_WINDOW_ROLE;
01012 }
01013 
01014 static void property_notify(uint8_t state, xcb_window_t window, xcb_atom_t atom) {
01015     struct property_handler_t *handler = NULL;
01016     xcb_get_property_reply_t *propr = NULL;
01017 
01018     for (int c = 0; c < sizeof(property_handlers) / sizeof(struct property_handler_t); c++) {
01019         if (property_handlers[c].atom != atom)
01020             continue;
01021 
01022         handler = &property_handlers[c];
01023         break;
01024     }
01025 
01026     if (handler == NULL) {
01027         //DLOG("Unhandled property notify for atom %d (0x%08x)\n", atom, atom);
01028         return;
01029     }
01030 
01031     if (state != XCB_PROPERTY_DELETE) {
01032         xcb_get_property_cookie_t cookie = xcb_get_property(conn, 0, window, atom, XCB_GET_PROPERTY_TYPE_ANY, 0, handler->long_len);
01033         propr = xcb_get_property_reply(conn, cookie, 0);
01034     }
01035 
01036     /* the handler will free() the reply unless it returns false */
01037     if (!handler->cb(NULL, conn, state, window, atom, propr))
01038         FREE(propr);
01039 }
01040 
01041 /*
01042  * Takes an xcb_generic_event_t and calls the appropriate handler, based on the
01043  * event type.
01044  *
01045  */
01046 void handle_event(int type, xcb_generic_event_t *event) {
01047     if (randr_base > -1 &&
01048         type == randr_base + XCB_RANDR_SCREEN_CHANGE_NOTIFY) {
01049         handle_screen_change(event);
01050         return;
01051     }
01052 
01053     switch (type) {
01054         case XCB_KEY_PRESS:
01055             handle_key_press((xcb_key_press_event_t*)event);
01056             break;
01057 
01058         case XCB_BUTTON_PRESS:
01059             handle_button_press((xcb_button_press_event_t*)event);
01060             break;
01061 
01062         case XCB_MAP_REQUEST:
01063             handle_map_request((xcb_map_request_event_t*)event);
01064             break;
01065 
01066         case XCB_UNMAP_NOTIFY:
01067             handle_unmap_notify_event((xcb_unmap_notify_event_t*)event);
01068             break;
01069 
01070         case XCB_DESTROY_NOTIFY:
01071             handle_destroy_notify_event((xcb_destroy_notify_event_t*)event);
01072             break;
01073 
01074         case XCB_EXPOSE:
01075             handle_expose_event((xcb_expose_event_t*)event);
01076             break;
01077 
01078         case XCB_MOTION_NOTIFY:
01079             handle_motion_notify((xcb_motion_notify_event_t*)event);
01080             break;
01081 
01082         /* Enter window = user moved his mouse over the window */
01083         case XCB_ENTER_NOTIFY:
01084             handle_enter_notify((xcb_enter_notify_event_t*)event);
01085             break;
01086 
01087         /* Client message are sent to the root window. The only interesting
01088          * client message for us is _NET_WM_STATE, we honour
01089          * _NET_WM_STATE_FULLSCREEN */
01090         case XCB_CLIENT_MESSAGE:
01091             handle_client_message((xcb_client_message_event_t*)event);
01092             break;
01093 
01094         /* Configure request = window tried to change size on its own */
01095         case XCB_CONFIGURE_REQUEST:
01096             handle_configure_request((xcb_configure_request_event_t*)event);
01097             break;
01098 
01099         /* Mapping notify = keyboard mapping changed (Xmodmap), re-grab bindings */
01100         case XCB_MAPPING_NOTIFY:
01101             handle_mapping_notify((xcb_mapping_notify_event_t*)event);
01102             break;
01103 
01104         case XCB_FOCUS_IN:
01105             handle_focus_in((xcb_focus_in_event_t*)event);
01106             break;
01107 
01108         case XCB_PROPERTY_NOTIFY: {
01109             xcb_property_notify_event_t *e = (xcb_property_notify_event_t*)event;
01110             last_timestamp = e->time;
01111             property_notify(e->state, e->window, e->atom);
01112             break;
01113         }
01114 
01115         default:
01116             //DLOG("Unhandled event of type %d\n", type);
01117             break;
01118     }
01119 }