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i3bar: tray: little cleanups, more comments

This commit is contained in:
Michael Stapelberg 2011-08-17 01:12:42 +02:00
parent 55e503c17b
commit bd2a3363c0
1 changed files with 57 additions and 16 deletions
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53
i3bar/src/xcb.c
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@ -411,7 +411,14 @@ static void configure_trayclients() {
}
}
void handle_client_message(xcb_client_message_event_t* event) {
/*
* Handles ClientMessages (messages sent from another client directly to us).
*
* At the moment, only the tray window will receive client messages. All
* supported client messages currently are _NET_SYSTEM_TRAY_OPCODE.
*
*/
static void handle_client_message(xcb_client_message_event_t* event) {
if (event->type == atoms[_NET_SYSTEM_TRAY_OPCODE] &&
event->format == 32) {
DLOG("_NET_SYSTEM_TRAY_OPCODE received\n");
@ -474,7 +481,7 @@ void handle_client_message(xcb_client_message_event_t* event) {
xcb_reparent_window(xcb_connection,
client,
output->bar,
output->rect.w - font_height - 2, /* TODO: why -2? */
output->rect.w - font_height - 2,
2);
/* We reconfigure the window to use a reasonable size. The systray
* specification explicitly says:
@ -527,7 +534,12 @@ void handle_client_message(xcb_client_message_event_t* event) {
}
}
void handle_unmap_notify(xcb_unmap_notify_event_t* event) {
/*
* Handles UnmapNotify events. These events happen when a tray window unmaps
* itself. We then update our data structure
*
*/
static void handle_unmap_notify(xcb_unmap_notify_event_t* event) {
DLOG("UnmapNotify for window = %08x, event = %08x\n", event->window, event->event);
i3_output *walk;
@ -551,6 +563,11 @@ void handle_unmap_notify(xcb_unmap_notify_event_t* event) {
}
}
/*
* Handle PropertyNotify messages. Currently only the _XEMBED_INFO property is
* handled, which tells us whether a dock client should be mapped or unmapped.
*
*/
static void handle_property_notify(xcb_property_notify_event_t *event) {
DLOG("PropertyNotify\n");
if (event->atom == atoms[_XEMBED_INFO] &&
@ -877,6 +894,12 @@ char *init_xcb(char *fontname) {
return path;
}
/*
* Initializes tray support by requesting the appropriate _NET_SYSTEM_TRAY atom
* for the X11 display we are running on, then acquiring the selection for this
* atom. Afterwards, tray clients will send ClientMessages to our window.
*
*/
void init_tray() {
/* request the tray manager atom for the X11 display we are running on */
char atomname[strlen("_NET_SYSTEM_TRAY_S") + 11];
@ -886,11 +909,10 @@ void init_tray() {
tray_cookie = xcb_intern_atom(xcb_connection, 0, strlen(atomname), atomname);
/* tray support: we need a window to own the selection */
xcb_void_cookie_t selwin_cookie;
xcb_window_t selwin = xcb_generate_id(xcb_connection);
uint32_t selmask = XCB_CW_OVERRIDE_REDIRECT;
uint32_t selval[] = { 1 };
selwin_cookie = xcb_create_window_checked(xcb_connection,
xcb_create_window(xcb_connection,
xcb_screen->root_depth,
selwin,
xcb_root,
@ -923,7 +945,26 @@ void init_tray() {
tray_reply->atom,
XCB_CURRENT_TIME);
/* TODO: check if we got the selection */
/* Verify that we have the selection */
xcb_get_selection_owner_cookie_t selcookie;
xcb_get_selection_owner_reply_t *selreply;
selcookie = xcb_get_selection_owner(xcb_connection, tray_reply->atom);
if (!(selreply = xcb_get_selection_owner_reply(xcb_connection, selcookie, NULL))) {
ELOG("Could not get selection owner for %s\n", atomname);
exit(EXIT_FAILURE);
}
if (selreply->owner != selwin) {
ELOG("Could not set the %s selection. " \
"Maybe another tray is already running?\n", atomname);
/* NOTE that this error is not fatal. We just can’t provide tray
* functionality */
free(selreply);
return;
}
/* Inform clients waiting for a new _NET_SYSTEM_TRAY that we are here */
void *event = calloc(32, 1);
xcb_client_message_event_t *ev = event;
ev->response_type = XCB_CLIENT_MESSAGE;