i3
ewmh.c
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1 /*
2  * vim:ts=4:sw=4:expandtab
3  *
4  * i3 - an improved dynamic tiling window manager
5  * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
6  *
7  * ewmh.c: Get/set certain EWMH properties easily.
8  *
9  */
10 #include "all.h"
11 
12 /*
13  * Updates _NET_CURRENT_DESKTOP with the current desktop number.
14  *
15  * EWMH: The index of the current desktop. This is always an integer between 0
16  * and _NET_NUMBER_OF_DESKTOPS - 1.
17  *
18  */
20  Con *focused_ws = con_get_workspace(focused);
21  Con *output;
22  uint32_t idx = 0;
23  /* We count to get the index of this workspace because named workspaces
24  * don’t have the ->num property */
25  TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
26  Con *ws;
27  TAILQ_FOREACH(ws, &(output_get_content(output)->nodes_head), nodes) {
28  if (ws == focused_ws) {
29  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root,
30  A__NET_CURRENT_DESKTOP, XCB_ATOM_CARDINAL, 32, 1, &idx);
31  return;
32  }
33  ++idx;
34  }
35  }
36 }
37 
38 /*
39  * Updates _NET_ACTIVE_WINDOW with the currently focused window.
40  *
41  * EWMH: The window ID of the currently active window or None if no window has
42  * the focus.
43  *
44  */
45 void ewmh_update_active_window(xcb_window_t window) {
46  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root,
47  A__NET_ACTIVE_WINDOW, XCB_ATOM_WINDOW, 32, 1, &window);
48 }
49 
50 /*
51  * Updates the workarea for each desktop.
52  *
53  * This function is not called at the moment due to:
54  * http://bugs.i3wm.org/539
55  * http://bugs.i3wm.org/301
56  *
57  * EWMH: Contains a geometry for each desktop. These geometries specify an area
58  * that is completely contained within the viewport. Work area SHOULD be used by
59  * desktop applications to place desktop icons appropriately.
60  *
61  */
63  int num_workspaces = 0, count = 0;
64  Rect last_rect = {0, 0, 0, 0};
65  Con *output;
66 
67  TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
68  Con *ws;
69  TAILQ_FOREACH(ws, &(output_get_content(output)->nodes_head), nodes) {
70  /* Check if we need to initialize last_rect. The case that the
71  * first workspace is all-zero may happen when the user
72  * assigned workspace 2 for his first screen, for example. Thus
73  * we need an initialized last_rect in the very first run of
74  * the following loop. */
75  if (last_rect.width == 0 && last_rect.height == 0 &&
76  ws->rect.width != 0 && ws->rect.height != 0) {
77  memcpy(&last_rect, &(ws->rect), sizeof(Rect));
78  }
79  num_workspaces++;
80  }
81  }
82 
83  DLOG("Got %d workspaces\n", num_workspaces);
84  uint8_t *workarea = smalloc(sizeof(Rect) * num_workspaces);
85  TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
86  Con *ws;
87  TAILQ_FOREACH(ws, &(output_get_content(output)->nodes_head), nodes) {
88  DLOG("storing %d: %dx%d with %d x %d\n", count, ws->rect.x,
89  ws->rect.y, ws->rect.width, ws->rect.height);
90  /* If a workspace is not yet initialized and thus its
91  * dimensions are zero, we will instead put the dimensions
92  * of the last workspace in the list. For example firefox
93  * intersects all workspaces and does not cope so well with
94  * an all-zero workspace. */
95  if (ws->rect.width == 0 || ws->rect.height == 0) {
96  DLOG("re-using last_rect (%dx%d, %d, %d)\n",
97  last_rect.x, last_rect.y, last_rect.width,
98  last_rect.height);
99  memcpy(workarea + (sizeof(Rect) * count++), &last_rect, sizeof(Rect));
100  continue;
101  }
102  memcpy(workarea + (sizeof(Rect) * count++), &(ws->rect), sizeof(Rect));
103  memcpy(&last_rect, &(ws->rect), sizeof(Rect));
104  }
105  }
106  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root,
107  A__NET_WORKAREA, XCB_ATOM_CARDINAL, 32,
108  num_workspaces * (sizeof(Rect) / sizeof(uint32_t)),
109  workarea);
110  free(workarea);
111  xcb_flush(conn);
112 }
113 
114 /*
115  * Updates the _NET_CLIENT_LIST_STACKING hint.
116  *
117  */
118 void ewmh_update_client_list_stacking(xcb_window_t *stack, int num_windows) {
119  xcb_change_property(
120  conn,
121  XCB_PROP_MODE_REPLACE,
122  root,
123  A__NET_CLIENT_LIST_STACKING,
125  32,
126  num_windows,
127  stack);
128 }
129 
130 /*
131  * Set up the EWMH hints on the root window.
132  *
133  */
134 void ewmh_setup_hints(void) {
135  xcb_atom_t supported_atoms[] = {
136 #define xmacro(atom) A_ ## atom,
137 #include "atoms.xmacro"
138 #undef xmacro
139  };
140 
141  /* Set up the window manager’s name. According to EWMH, section "Root Window
142  * Properties", to indicate that an EWMH-compliant window manager is
143  * present, a child window has to be created (and kept alive as long as the
144  * window manager is running) which has the _NET_SUPPORTING_WM_CHECK and
145  * _NET_WM_ATOMS. */
146  xcb_window_t child_window = xcb_generate_id(conn);
147  xcb_create_window(
148  conn,
149  XCB_COPY_FROM_PARENT, /* depth */
150  child_window, /* window id */
151  root, /* parent */
152  0, 0, 1, 1, /* dimensions (x, y, w, h) */
153  0, /* border */
154  XCB_WINDOW_CLASS_INPUT_ONLY, /* window class */
155  XCB_COPY_FROM_PARENT, /* visual */
156  0,
157  NULL);
158  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, child_window, A__NET_SUPPORTING_WM_CHECK, XCB_ATOM_WINDOW, 32, 1, &child_window);
159  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, child_window, A__NET_WM_NAME, A_UTF8_STRING, 8, strlen("i3"), "i3");
160  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A__NET_SUPPORTING_WM_CHECK, XCB_ATOM_WINDOW, 32, 1, &child_window);
161 
162  /* I’m not entirely sure if we need to keep _NET_WM_NAME on root. */
163  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A__NET_WM_NAME, A_UTF8_STRING, 8, strlen("i3"), "i3");
164 
165  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A__NET_SUPPORTED, XCB_ATOM_ATOM, 32, 16, supported_atoms);
166 }