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1 /*
2  * vim:ts=8:expandtab
3  *
4  * i3 - an improved dynamic tiling window manager
5  *
6  * © 2009 Michael Stapelberg and contributors
7  *
8  * See file LICENSE for license information.
9  *
10  */
11 #include <stdio.h>
12 #include <assert.h>
13 #include <string.h>
14 #include <stdlib.h>
15 #include <xcb/xcb.h>
16
17 #include <xcb/xcb_wm.h>
18 #include <X11/XKBlib.h>
19
20 #include "i3.h"
21 #include "debug.h"
22 #include "table.h"
23 #include "layout.h"
24 #include "commands.h"
25 #include "data.h"
26 #include "font.h"
27 #include "xcb.h"
28 #include "util.h"
29 #include "xinerama.h"
30
31 /*
32  * Due to bindings like Mode_switch + <a>, we need to bind some keys in XCB_GRAB_MODE_SYNC.
33  * Therefore, we just replay all key presses.
34  *
35  */
36 int handle_key_release(void *ignored, xcb_connection_t *conn, xcb_key_release_event_t *event) {
37         printf("got key release, just passing\n");
38         xcb_allow_events(conn, XCB_ALLOW_REPLAY_KEYBOARD, event->time);
39         xcb_flush(conn);
40         return 1;
41 }
42
43 /*
44  * There was a key press. We compare this key code with our bindings table and pass
45  * the bound action to parse_command().
46  *
47  */
48 int handle_key_press(void *ignored, xcb_connection_t *conn, xcb_key_press_event_t *event) {
49         printf("Keypress %d\n", event->detail);
50
51         /* We need to get the keysym group (There are group 1 to group 4, each holding
52            two keysyms (without shift and with shift) using Xkb because X fails to
53            provide them reliably (it works in Xephyr, it does not in real X) */
54         XkbStateRec state;
55         if (XkbGetState(xkbdpy, XkbUseCoreKbd, &state) == Success && (state.group+1) == 2)
56                 event->state |= 0x2;
57
58         printf("state %d\n", event->state);
59
60         /* Remove the numlock bit, all other bits are modifiers we can bind to */
61         uint16_t state_filtered = event->state & ~XCB_MOD_MASK_LOCK;
62
63         /* Find the binding */
64         Binding *bind;
65         TAILQ_FOREACH(bind, &bindings, bindings)
66                 if (bind->keycode == event->detail && bind->mods == state_filtered)
67                         break;
68
69         /* No match? Then it was an actively grabbed key, that is with Mode_switch, and
70            the user did not press Mode_switch, so just pass it… */
71         if (bind == TAILQ_END(&bindings)) {
72                 xcb_allow_events(conn, ReplayKeyboard, event->time);
73                 xcb_flush(conn);
74                 return 1;
75         }
76
77         parse_command(conn, bind->command);
78         if (event->state & 0x2) {
79                 printf("Mode_switch -> allow_events(SyncKeyboard)\n");
80                 xcb_allow_events(conn, SyncKeyboard, event->time);
81                 xcb_flush(conn);
82         }
83         return 1;
84 }
85
86
87 /*
88  * When the user moves the mouse pointer onto a window, this callback gets called.
89  *
90  */
91 int handle_enter_notify(void *ignored, xcb_connection_t *conn, xcb_enter_notify_event_t *event) {
92         printf("enter_notify\n");
93
94         /* This was either a focus for a client’s parent (= titlebar)… */
95         Client *client = table_get(byParent, event->event);
96         /* …or the client itself */
97         if (client == NULL)
98                 client = table_get(byChild, event->event);
99
100         /* If not, then the user moved his cursor to the root window. In that case, we adjust c_ws */
101         if (client == NULL) {
102                 printf("Getting screen at %d x %d\n", event->root_x, event->root_y);
103                 i3Screen *screen = get_screen_containing(event->root_x, event->root_y);
104                 if (screen == NULL) {
105                         printf("ERROR: No such screen\n");
106                         return 0;
107                 }
108                 c_ws = &workspaces[screen->current_workspace];
109                 printf("We're now on virtual screen number %d\n", screen->num);
110                 return 1;
111         }
112
113         set_focus(conn, client);
114
115         return 1;
116 }
117
118 int handle_button_press(void *ignored, xcb_connection_t *conn, xcb_button_press_event_t *event) {
119         printf("button press!\n");
120         /* This was either a focus for a client’s parent (= titlebar)… */
121         Client *client = table_get(byChild, event->event);
122         bool border_click = false;
123         if (client == NULL) {
124                 client = table_get(byParent, event->event);
125                 border_click = true;
126         }
127         if (client == NULL)
128                 return 1;
129
130         xcb_window_t root = xcb_setup_roots_iterator(xcb_get_setup(conn)).data->root;
131         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
132
133         /* Set focus in any case */
134         set_focus(conn, client);
135
136         /* Let’s see if this was on the borders (= resize). If not, we’re done */
137         printf("press button on x=%d, y=%d\n", event->event_x, event->event_y);
138
139         Container *con = client->container,
140                   *first = NULL,
141                   *second = NULL;
142
143         printf("event->event_x = %d, client->rect.width = %d\n", event->event_x, client->rect.width);
144
145         if (!border_click) {
146                 printf("client. done.\n");
147                 return 1;
148         }
149
150         if (event->event_y < 2) {
151                 /* This was a press on the top border */
152                 if (con->row == 0)
153                         return 1;
154                 return 0; /* TODO: impl */
155                 //neighbor_con = this_con->workspace->table[this_con->col][this_con->row-1];
156         } else if (event->event_y >= (client->rect.height - 2)) {
157                 /* …bottom border */
158                 if (con->row == (con->workspace->rows-1))
159                         return 1;
160                 return 0; /* TODO; impl */
161                 //neighbor_con = this_con->workspace->table[this_con->col][this_con->row+1];
162         } else if (event->event_x < 2) {
163                 /* …left border */
164                 if (con->col == 0)
165                         return 1;
166                 first = con->workspace->table[con->col-1][con->row];
167                 second = con;
168         } else if (event->event_x > 2) {
169                 /* …right border */
170                 if (con->col == (con->workspace->cols-1))
171                         return 1;
172                 first = con;
173                 second = con->workspace->table[con->col+1][con->row];
174         }
175
176         /* Open a new window, the resizebar. Grab the pointer and move the window around
177            as the user moves the pointer. */
178         Rect grabrect = {0, 0, root_screen->width_in_pixels, root_screen->height_in_pixels};
179         xcb_window_t grabwin = create_window(conn, grabrect, XCB_WINDOW_CLASS_INPUT_ONLY, 0, NULL);
180
181         Rect helprect = {event->root_x, 0, 2, root_screen->height_in_pixels /* this has to be the cell’s height */};
182         xcb_window_t helpwin = create_window(conn, helprect, XCB_WINDOW_CLASS_INPUT_OUTPUT, 0, NULL);
183
184         uint32_t values[1] = {get_colorpixel(conn, helpwin, "#4c7899")};
185         xcb_void_cookie_t cookie = xcb_change_window_attributes_checked(conn, helpwin, XCB_CW_BACK_PIXEL, values);
186         check_error(conn, cookie, "Could not change window attributes (background color)");
187
188         xcb_circulate_window(conn, XCB_CIRCULATE_RAISE_LOWEST, helpwin);
189
190         xcb_grab_pointer(conn, false, root, XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_POINTER_MOTION,
191                         XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC, grabwin, XCB_NONE, XCB_CURRENT_TIME);
192
193         xcb_flush(conn);
194
195         xcb_generic_event_t *inside_event;
196         /* I’ve always wanted to have my own eventhandler… */
197         while ((inside_event = xcb_wait_for_event(conn))) {
198                 /* Same as get_event_handler in xcb */
199                 int nr = inside_event->response_type;
200                 if (nr == 0) {
201                         /* An error occured */
202                         handle_event(NULL, conn, inside_event);
203                         free(inside_event);
204                         continue;
205                 }
206                 assert(nr < 256);
207                 nr &= XCB_EVENT_RESPONSE_TYPE_MASK;
208                 assert(nr >= 2);
209
210                 /* Check if we need to escape this loop… */
211                 if (nr == XCB_BUTTON_RELEASE)
212                         break;
213
214                 switch (nr) {
215                         case XCB_MOTION_NOTIFY:
216                                 values[0] = ((xcb_motion_notify_event_t*)inside_event)->root_x;
217                                 xcb_configure_window(conn, helpwin, XCB_CONFIG_WINDOW_X, values);
218                                 xcb_flush(conn);
219                                 break;
220                         case XCB_EXPOSE:
221                                 /* Use original handler */
222                                 xcb_event_handle(&evenths, inside_event);
223                                 break;
224                         default:
225                                 printf("Ignoring event of type %d\n", nr);
226                                 break;
227                 }
228                 printf("---\n");
229                 free(inside_event);
230         }
231
232         xcb_ungrab_pointer(conn, XCB_CURRENT_TIME);
233         xcb_destroy_window(conn, helpwin);
234         xcb_destroy_window(conn, grabwin);
235         xcb_flush(conn);
236
237         Workspace *ws = con->workspace;
238
239         printf("Resize was from X = %d to X = %d\n", event->root_x, values[0]);
240
241         /* Convert 0 (for default width_factor) to actual numbers */
242         if (first->width_factor == 0)
243                 first->width_factor = ((float)ws->rect.width / ws->cols) / ws->rect.width;
244         if (second->width_factor == 0)
245                 second->width_factor = ((float)ws->rect.width / ws->cols) / ws->rect.width;
246
247         first->width_factor *= (float)(first->width + (values[0] - event->root_x)) / first->width;
248         second->width_factor *= (float)(second->width - (values[0] - event->root_x)) / second->width;
249
250         render_layout(conn);
251
252         return 1;
253 }
254
255 int handle_map_notify_event(void *prophs, xcb_connection_t *conn, xcb_map_notify_event_t *event) {
256         window_attributes_t wa = { TAG_VALUE };
257         wa.u.override_redirect = event->override_redirect;
258         printf("MapNotify for 0x%08x.\n", event->window);
259         manage_window(prophs, conn, event->window, wa);
260         return 1;
261 }
262
263 /*
264  * Our window decorations were unmapped. That means, the window will be killed now,
265  * so we better clean up before.
266  *
267  */
268 int handle_unmap_notify_event(void *data, xcb_connection_t *c, xcb_unmap_notify_event_t *e) {
269         xcb_window_t root = xcb_setup_roots_iterator(xcb_get_setup(c)).data->root;
270
271         Client *client = table_get(byChild, e->window);
272         /* First, we need to check if the client is awaiting an unmap-request which
273            was generated by us reparenting the window. In that case, we just ignore it. */
274         if (client != NULL && client->awaiting_useless_unmap) {
275                 printf("Dropping this unmap request, it was generated by reparenting\n");
276                 client->awaiting_useless_unmap = false;
277                 return 1;
278         }
279         client = table_remove(byChild, e->window);
280
281         printf("UnmapNotify for 0x%08x (received from 0x%08x): ", e->window, e->event);
282         if(client == NULL) {
283                 printf("not a managed window. Ignoring.\n");
284                 return 0;
285         }
286
287
288         if (client->container->currently_focused == client)
289                 client->container->currently_focused = NULL;
290         CIRCLEQ_REMOVE(&(client->container->clients), client, clients);
291
292         printf("child of 0x%08x.\n", client->frame);
293         xcb_reparent_window(c, client->child, root, 0, 0);
294         xcb_destroy_window(c, client->frame);
295         xcb_flush(c);
296         table_remove(byParent, client->frame);
297         free(client);
298
299         render_layout(c);
300
301         return 1;
302 }
303
304 /*
305  * Called when a window changes its title
306  *
307  */
308 int handle_windowname_change(void *data, xcb_connection_t *conn, uint8_t state,
309                                 xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
310         printf("window's name changed.\n");
311         Client *client = table_get(byChild, window);
312         if (client == NULL)
313                 return 1;
314
315         client->name_len = xcb_get_property_value_length(prop);
316         client->name = malloc(client->name_len);
317         strncpy(client->name, xcb_get_property_value(prop), client->name_len);
318         printf("rename to \"%.*s\".\n", client->name_len, client->name);
319
320         decorate_window(conn, client);
321         xcb_flush(conn);
322
323         return 1;
324 }
325
326 /*
327  * Expose event means we should redraw our windows (= title bar)
328  *
329  */
330 int handle_expose_event(void *data, xcb_connection_t *conn, xcb_expose_event_t *e) {
331         Client *client = table_get(byParent, e->window);
332         if(!client || e->count != 0)
333                 return 1;
334         printf("handle_expose_event()\n");
335         decorate_window(conn, client);
336         return 1;
337 }
338
339 /*
340  * Handle client messages (EWMH)
341  *
342  */
343 int handle_client_message(void *data, xcb_connection_t *conn, xcb_client_message_event_t *event) {
344         printf("client_message\n");
345
346         if (event->type == atoms[_NET_WM_STATE]) {
347                 if (event->format != 32 || event->data.data32[1] != atoms[_NET_WM_STATE_FULLSCREEN])
348                         return 0;
349
350                 printf("fullscreen\n");
351
352                 Client *client = table_get(byChild, event->window);
353                 if (client == NULL)
354                         return 0;
355
356                 /* Check if the fullscreen state should be toggled… */
357                 if ((client->fullscreen &&
358                      (event->data.data32[0] == _NET_WM_STATE_REMOVE ||
359                       event->data.data32[0] == _NET_WM_STATE_TOGGLE)) ||
360                     (!client->fullscreen &&
361                      (event->data.data32[0] == _NET_WM_STATE_ADD ||
362                       event->data.data32[0] == _NET_WM_STATE_TOGGLE)))
363                         toggle_fullscreen(conn, client);
364         } else {
365                 printf("unhandled clientmessage\n");
366                 return 0;
367         }
368
369         return 1;
370 }
371
372 int window_type_handler(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
373                         xcb_atom_t atom, xcb_get_property_reply_t *property) {
374         /* TODO: Implement this one. To do this, implement a little test program which sleep(1)s
375          before changing this property. */
376         printf("_NET_WM_WINDOW_TYPE changed, this is not yet implemented.\n");
377         return 0;
378 }