i3
ewmh.c
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1 #undef I3__FILE__
2 #define I3__FILE__ "ewmh.c"
3 /*
4  * vim:ts=4:sw=4:expandtab
5  *
6  * i3 - an improved dynamic tiling window manager
7  * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
8  *
9  * ewmh.c: Get/set certain EWMH properties easily.
10  *
11  */
12 #include "all.h"
13 
14 /*
15  * Updates _NET_CURRENT_DESKTOP with the current desktop number.
16  *
17  * EWMH: The index of the current desktop. This is always an integer between 0
18  * and _NET_NUMBER_OF_DESKTOPS - 1.
19  *
20  */
22  Con *focused_ws = con_get_workspace(focused);
23  Con *output;
24  uint32_t idx = 0;
25  /* We count to get the index of this workspace because named workspaces
26  * don’t have the ->num property */
27  TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
28  Con *ws;
29  TAILQ_FOREACH(ws, &(output_get_content(output)->nodes_head), nodes) {
30  if (ws == focused_ws) {
31  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root,
32  A__NET_CURRENT_DESKTOP, XCB_ATOM_CARDINAL, 32, 1, &idx);
33  return;
34  }
35  ++idx;
36  }
37  }
38 }
39 
40 /*
41  * Updates _NET_ACTIVE_WINDOW with the currently focused window.
42  *
43  * EWMH: The window ID of the currently active window or None if no window has
44  * the focus.
45  *
46  */
47 void ewmh_update_active_window(xcb_window_t window) {
48  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root,
49  A__NET_ACTIVE_WINDOW, XCB_ATOM_WINDOW, 32, 1, &window);
50 }
51 
52 /*
53  * Updates the workarea for each desktop.
54  *
55  * This function is not called at the moment due to:
56  * http://bugs.i3wm.org/539
57  * http://bugs.i3wm.org/301
58  *
59  * EWMH: Contains a geometry for each desktop. These geometries specify an area
60  * that is completely contained within the viewport. Work area SHOULD be used by
61  * desktop applications to place desktop icons appropriately.
62  *
63  */
65  int num_workspaces = 0, count = 0;
66  Rect last_rect = {0, 0, 0, 0};
67  Con *output;
68 
69  TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
70  Con *ws;
71  TAILQ_FOREACH(ws, &(output_get_content(output)->nodes_head), nodes) {
72  /* Check if we need to initialize last_rect. The case that the
73  * first workspace is all-zero may happen when the user
74  * assigned workspace 2 for his first screen, for example. Thus
75  * we need an initialized last_rect in the very first run of
76  * the following loop. */
77  if (last_rect.width == 0 && last_rect.height == 0 &&
78  ws->rect.width != 0 && ws->rect.height != 0) {
79  memcpy(&last_rect, &(ws->rect), sizeof(Rect));
80  }
81  num_workspaces++;
82  }
83  }
84 
85  DLOG("Got %d workspaces\n", num_workspaces);
86  uint8_t *workarea = smalloc(sizeof(Rect) * num_workspaces);
87  TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
88  Con *ws;
89  TAILQ_FOREACH(ws, &(output_get_content(output)->nodes_head), nodes) {
90  DLOG("storing %d: %dx%d with %d x %d\n", count, ws->rect.x,
91  ws->rect.y, ws->rect.width, ws->rect.height);
92  /* If a workspace is not yet initialized and thus its
93  * dimensions are zero, we will instead put the dimensions
94  * of the last workspace in the list. For example firefox
95  * intersects all workspaces and does not cope so well with
96  * an all-zero workspace. */
97  if (ws->rect.width == 0 || ws->rect.height == 0) {
98  DLOG("re-using last_rect (%dx%d, %d, %d)\n",
99  last_rect.x, last_rect.y, last_rect.width,
100  last_rect.height);
101  memcpy(workarea + (sizeof(Rect) * count++), &last_rect, sizeof(Rect));
102  continue;
103  }
104  memcpy(workarea + (sizeof(Rect) * count++), &(ws->rect), sizeof(Rect));
105  memcpy(&last_rect, &(ws->rect), sizeof(Rect));
106  }
107  }
108  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root,
109  A__NET_WORKAREA, XCB_ATOM_CARDINAL, 32,
110  num_workspaces * (sizeof(Rect) / sizeof(uint32_t)),
111  workarea);
112  free(workarea);
113  xcb_flush(conn);
114 }
115 
116 /*
117  * Updates the _NET_CLIENT_LIST_STACKING hint.
118  *
119  */
120 void ewmh_update_client_list_stacking(xcb_window_t *stack, int num_windows) {
121  xcb_change_property(
122  conn,
123  XCB_PROP_MODE_REPLACE,
124  root,
125  A__NET_CLIENT_LIST_STACKING,
127  32,
128  num_windows,
129  stack);
130 }
131 
132 /*
133  * Set up the EWMH hints on the root window.
134  *
135  */
136 void ewmh_setup_hints(void) {
137  xcb_atom_t supported_atoms[] = {
138 #define xmacro(atom) A_ ## atom,
139 #include "atoms.xmacro"
140 #undef xmacro
141  };
142 
143  /* Set up the window manager’s name. According to EWMH, section "Root Window
144  * Properties", to indicate that an EWMH-compliant window manager is
145  * present, a child window has to be created (and kept alive as long as the
146  * window manager is running) which has the _NET_SUPPORTING_WM_CHECK and
147  * _NET_WM_ATOMS. */
148  xcb_window_t child_window = xcb_generate_id(conn);
149  xcb_create_window(
150  conn,
151  XCB_COPY_FROM_PARENT, /* depth */
152  child_window, /* window id */
153  root, /* parent */
154  0, 0, 1, 1, /* dimensions (x, y, w, h) */
155  0, /* border */
156  XCB_WINDOW_CLASS_INPUT_ONLY, /* window class */
157  XCB_COPY_FROM_PARENT, /* visual */
158  0,
159  NULL);
160  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, child_window, A__NET_SUPPORTING_WM_CHECK, XCB_ATOM_WINDOW, 32, 1, &child_window);
161  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, child_window, A__NET_WM_NAME, A_UTF8_STRING, 8, strlen("i3"), "i3");
162  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A__NET_SUPPORTING_WM_CHECK, XCB_ATOM_WINDOW, 32, 1, &child_window);
163 
164  /* I’m not entirely sure if we need to keep _NET_WM_NAME on root. */
165  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A__NET_WM_NAME, A_UTF8_STRING, 8, strlen("i3"), "i3");
166 
167  xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A__NET_SUPPORTED, XCB_ATOM_ATOM, 32, 16, supported_atoms);
168 }