gri3-wm/src/ewmh.c

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/*
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* vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
* © 2009 Michael Stapelberg and contributors (see also: LICENSE)
*
* ewmh.c: Get/set certain EWMH properties easily.
*
*/
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#include "all.h"
xcb_window_t ewmh_window;
/*
* Updates _NET_CURRENT_DESKTOP with the current desktop number.
*
* EWMH: The index of the current desktop. This is always an integer between 0
* and _NET_NUMBER_OF_DESKTOPS - 1.
*
*/
void ewmh_update_current_desktop(void) {
const uint32_t idx = ewmh_get_workspace_index(focused);
if (idx != NET_WM_DESKTOP_NONE) {
xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A__NET_CURRENT_DESKTOP, XCB_ATOM_CARDINAL, 32, 1, &idx);
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}
}
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/*
* Updates _NET_NUMBER_OF_DESKTOPS which we interpret as the number of
* noninternal workspaces.
*/
void ewmh_update_number_of_desktops(void) {
Con *output;
uint32_t idx = 0;
TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
Con *ws;
TAILQ_FOREACH(ws, &(output_get_content(output)->nodes_head), nodes) {
if (STARTS_WITH(ws->name, "__"))
continue;
++idx;
}
}
xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root,
A__NET_NUMBER_OF_DESKTOPS, XCB_ATOM_CARDINAL, 32, 1, &idx);
}
/*
* Updates _NET_DESKTOP_NAMES: "The names of all virtual desktops. This is a
* list of NULL-terminated strings in UTF-8 encoding"
*/
void ewmh_update_desktop_names(void) {
Con *output;
int msg_length = 0;
/* count the size of the property message to set */
TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
Con *ws;
TAILQ_FOREACH(ws, &(output_get_content(output)->nodes_head), nodes) {
if (STARTS_WITH(ws->name, "__"))
continue;
msg_length += strlen(ws->name) + 1;
}
}
char desktop_names[msg_length];
int current_position = 0;
/* fill the buffer with the names of the i3 workspaces */
TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
Con *ws;
TAILQ_FOREACH(ws, &(output_get_content(output)->nodes_head), nodes) {
if (STARTS_WITH(ws->name, "__"))
continue;
for (size_t i = 0; i < strlen(ws->name) + 1; i++) {
desktop_names[current_position++] = ws->name[i];
}
}
}
xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root,
A__NET_DESKTOP_NAMES, A_UTF8_STRING, 8, msg_length, desktop_names);
}
/*
* Updates _NET_DESKTOP_VIEWPORT, which is an array of pairs of cardinals that
* define the top left corner of each desktop's viewport.
*/
void ewmh_update_desktop_viewport(void) {
Con *output;
int num_desktops = 0;
/* count number of desktops */
TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
Con *ws;
TAILQ_FOREACH(ws, &(output_get_content(output)->nodes_head), nodes) {
if (STARTS_WITH(ws->name, "__"))
continue;
num_desktops++;
}
}
uint32_t viewports[num_desktops * 2];
int current_position = 0;
/* fill the viewport buffer */
TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
Con *ws;
TAILQ_FOREACH(ws, &(output_get_content(output)->nodes_head), nodes) {
if (STARTS_WITH(ws->name, "__"))
continue;
viewports[current_position++] = output->rect.x;
viewports[current_position++] = output->rect.y;
}
}
xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root,
A__NET_DESKTOP_VIEWPORT, XCB_ATOM_CARDINAL, 32, current_position, &viewports);
}
static void ewmh_update_wm_desktop_recursively(Con *con, const uint32_t desktop) {
Con *child;
/* Recursively call this to descend through the entire subtree. */
TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
ewmh_update_wm_desktop_recursively(child, desktop);
}
/* If con is a workspace, we also need to go through the floating windows on it. */
if (con->type == CT_WORKSPACE) {
TAILQ_FOREACH(child, &(con->floating_head), floating_windows) {
ewmh_update_wm_desktop_recursively(child, desktop);
}
}
if (!con_has_managed_window(con))
return;
uint32_t wm_desktop = desktop;
/* Sticky windows are only actually sticky when they are floating or inside
* a floating container. This is technically still slightly wrong, since
* sticky windows will only be on all workspaces on this output, but we
* ignore multi-monitor situations for this since the spec isn't too
* precise on this anyway. */
if (con_is_sticky(con) && con_is_floating(con)) {
wm_desktop = NET_WM_DESKTOP_ALL;
}
/* If the window is on the scratchpad we assign the sticky value to it
* since showing it works on any workspace. We cannot remove the property
* as per specification. */
Con *ws = con_get_workspace(con);
if (ws != NULL && con_is_internal(ws)) {
wm_desktop = NET_WM_DESKTOP_ALL;
}
/* If this is the cached value, we don't need to do anything. */
if (con->window->wm_desktop == wm_desktop)
return;
con->window->wm_desktop = wm_desktop;
const xcb_window_t window = con->window->id;
if (wm_desktop != NET_WM_DESKTOP_NONE) {
DLOG("Setting _NET_WM_DESKTOP = %d for window 0x%08x.\n", wm_desktop, window);
xcb_change_property(conn, XCB_PROP_MODE_REPLACE, window, A__NET_WM_DESKTOP, XCB_ATOM_CARDINAL, 32, 1, &wm_desktop);
} else {
/* If we can't determine the workspace index, delete the property. We'd
* rather not set it than lie. */
ELOG("Failed to determine the proper EWMH desktop index for window 0x%08x, deleting _NET_WM_DESKTOP.\n", window);
xcb_delete_property(conn, window, A__NET_WM_DESKTOP);
}
}
/*
* Updates _NET_WM_DESKTOP for all windows.
* A request will only be made if the cached value differs from the calculated value.
*
*/
void ewmh_update_wm_desktop(void) {
uint32_t desktop = 0;
Con *output;
TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
Con *workspace;
TAILQ_FOREACH(workspace, &(output_get_content(output)->nodes_head), nodes) {
ewmh_update_wm_desktop_recursively(workspace, desktop);
if (!con_is_internal(workspace)) {
++desktop;
}
}
}
}
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/*
* Updates _NET_ACTIVE_WINDOW with the currently focused window.
*
* EWMH: The window ID of the currently active window or None if no window has
* the focus.
*
*/
void ewmh_update_active_window(xcb_window_t window) {
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xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root,
A__NET_ACTIVE_WINDOW, XCB_ATOM_WINDOW, 32, 1, &window);
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}
/*
* Updates _NET_WM_VISIBLE_NAME.
*
*/
void ewmh_update_visible_name(xcb_window_t window, const char *name) {
if (name != NULL) {
xcb_change_property(conn, XCB_PROP_MODE_REPLACE, window, A__NET_WM_VISIBLE_NAME, A_UTF8_STRING, 8, strlen(name), name);
} else {
xcb_delete_property(conn, window, A__NET_WM_VISIBLE_NAME);
}
}
/*
* i3 currently does not support _NET_WORKAREA, because it does not correspond
* to i3s concept of workspaces. See also:
* http://bugs.i3wm.org/539
* http://bugs.i3wm.org/301
* http://bugs.i3wm.org/1038
*
* We need to actively delete this property because some display managers (e.g.
* LightDM) set it.
*
* EWMH: Contains a geometry for each desktop. These geometries specify an area
* that is completely contained within the viewport. Work area SHOULD be used by
* desktop applications to place desktop icons appropriately.
*
*/
void ewmh_update_workarea(void) {
xcb_delete_property(conn, root, A__NET_WORKAREA);
}
/*
* Updates the _NET_CLIENT_LIST hint.
*
*/
void ewmh_update_client_list(xcb_window_t *list, int num_windows) {
xcb_change_property(
conn,
XCB_PROP_MODE_REPLACE,
root,
A__NET_CLIENT_LIST,
XCB_ATOM_WINDOW,
32,
num_windows,
list);
}
/*
* Updates the _NET_CLIENT_LIST_STACKING hint.
*
*/
void ewmh_update_client_list_stacking(xcb_window_t *stack, int num_windows) {
xcb_change_property(
conn,
XCB_PROP_MODE_REPLACE,
root,
A__NET_CLIENT_LIST_STACKING,
XCB_ATOM_WINDOW,
32,
num_windows,
stack);
}
/*
* Set or remove _NET_WM_STATE_STICKY on the window.
*
*/
void ewmh_update_sticky(xcb_window_t window, bool sticky) {
if (sticky) {
DLOG("Setting _NET_WM_STATE_STICKY for window = %d.\n", window);
xcb_add_property_atom(conn, window, A__NET_WM_STATE, A__NET_WM_STATE_STICKY);
} else {
DLOG("Removing _NET_WM_STATE_STICKY for window = %d.\n", window);
xcb_remove_property_atom(conn, window, A__NET_WM_STATE, A__NET_WM_STATE_STICKY);
}
}
/*
* Set up the EWMH hints on the root window.
*
*/
void ewmh_setup_hints(void) {
xcb_atom_t supported_atoms[] = {
#define xmacro(atom) A_##atom,
#include "atoms_NET_SUPPORTED.xmacro"
#undef xmacro
};
/* Set up the window managers name. According to EWMH, section "Root Window
* Properties", to indicate that an EWMH-compliant window manager is
* present, a child window has to be created (and kept alive as long as the
* window manager is running) which has the _NET_SUPPORTING_WM_CHECK and
* _NET_WM_ATOMS. */
ewmh_window = xcb_generate_id(conn);
/* We create the window and put it at (-1, -1) so that it is off-screen. */
xcb_create_window(
conn,
XCB_COPY_FROM_PARENT, /* depth */
ewmh_window, /* window id */
root, /* parent */
-1, -1, 1, 1, /* dimensions (x, y, w, h) */
0, /* border */
XCB_WINDOW_CLASS_INPUT_ONLY, /* window class */
XCB_COPY_FROM_PARENT, /* visual */
XCB_CW_OVERRIDE_REDIRECT,
(uint32_t[]){1});
xcb_change_property(conn, XCB_PROP_MODE_REPLACE, ewmh_window, A__NET_SUPPORTING_WM_CHECK, XCB_ATOM_WINDOW, 32, 1, &ewmh_window);
xcb_change_property(conn, XCB_PROP_MODE_REPLACE, ewmh_window, A__NET_WM_NAME, A_UTF8_STRING, 8, strlen("i3"), "i3");
xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A__NET_SUPPORTING_WM_CHECK, XCB_ATOM_WINDOW, 32, 1, &ewmh_window);
/* Im not entirely sure if we need to keep _NET_WM_NAME on root. */
xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A__NET_WM_NAME, A_UTF8_STRING, 8, strlen("i3"), "i3");
xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A__NET_SUPPORTED, XCB_ATOM_ATOM, 32, /* number of atoms */ sizeof(supported_atoms) / sizeof(xcb_atom_t), supported_atoms);
/* We need to map this window to be able to set the input focus to it if no other window is available to be focused. */
xcb_map_window(conn, ewmh_window);
xcb_configure_window(conn, ewmh_window, XCB_CONFIG_WINDOW_STACK_MODE, (uint32_t[]){XCB_STACK_MODE_BELOW});
}
/*
* Returns the workspace container as enumerated by the EWMH desktop model.
* Returns NULL if no workspace could be found for the index.
*
* This is the reverse of ewmh_get_workspace_index.
*
*/
Con *ewmh_get_workspace_by_index(uint32_t idx) {
if (idx == NET_WM_DESKTOP_NONE)
return NULL;
uint32_t current_index = 0;
Con *output;
TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
Con *workspace;
TAILQ_FOREACH(workspace, &(output_get_content(output)->nodes_head), nodes) {
if (con_is_internal(workspace))
continue;
if (current_index == idx)
return workspace;
++current_index;
}
}
return NULL;
}
/*
* Returns the EWMH desktop index for the workspace the given container is on.
* Returns NET_WM_DESKTOP_NONE if the desktop index cannot be determined.
*
* This is the reverse of ewmh_get_workspace_by_index.
*
*/
uint32_t ewmh_get_workspace_index(Con *con) {
uint32_t index = 0;
Con *workspace = con_get_workspace(con);
Con *output;
TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
Con *current;
TAILQ_FOREACH(current, &(output_get_content(output)->nodes_head), nodes) {
if (con_is_internal(current))
continue;
if (current == workspace)
return index;
++index;
}
}
return NET_WM_DESKTOP_NONE;
}