实现 _NET_ACTIVE_WINDOW 消息协议

src/atoms-list.txt

@@ -10,6 +10,7 @@ UTF8_STRING
 COMPOUND_TEXT
 
 _NET_ACTIVE_WINDOW
+_NET_CLIENT_LIST
 _NET_WM_NAME
 _NET_WM_ICON_NAME
 _NET_SUPPORTING_WM_CHECK

src/client.c

@@ -204,6 +204,9 @@ void client_manage(xcb_window_t window,
   client_attach_list(c);
   client_attach_stack(c);
 
+  xcb_change_property(wm.xcb_conn, XCB_PROP_MODE_APPEND, wm.screen->root,
+                      _NET_CLIENT_LIST, XCB_ATOM_WINDOW, 32, 1, &window);
+
   monitor_arrange(c->monitor);
   monitor_draw_bar(c->monitor);
 
@@ -284,6 +287,19 @@ void client_update_wm_hints(client_t *client) {
   }
 }
 
+static void update_client_list(void) {
+  xcb_connection_t *conn = wm.xcb_conn;
+  xcb_window_t root = wm.screen->root;
+  xcb_atom_t atom = _NET_CLIENT_LIST;
+  uint8_t mode = XCB_PROP_MODE_PREPEND;
+  xcb_atom_t type = XCB_ATOM_WINDOW;
+
+  xcb_delete_property(conn, root, atom);
+  for (client_t *c = wm.client_list; c; c = c->next) {
+    xcb_change_property(conn, mode, root, atom, type, 32, 1, &c->window);
+  }
+}
+
 void client_unmanage(client_t *client) {
   monitor_t *m = client->monitor;
 
@@ -296,6 +312,8 @@ void client_unmanage(client_t *client) {
 
   client_wipe(client);
 
+  update_client_list();
+
   wm_restack_clients();
   monitor_deal_focus(m);
   monitor_arrange(m);

src/event.c

@@ -135,6 +135,22 @@ static void map_request(xcb_map_request_event_t *ev) {
   p_delete(&wa_reply);
 }
 
+static void client_message(xcb_client_message_event_t *ev) {
+  client_t *c = client_get_by_window(ev->window);
+  if (c == nullptr) return;
+
+  if (ev->type == _NET_ACTIVE_WINDOW) {
+    for (tag_t *t = c->monitor->tag_list; t; t = t->next) {
+      if ((t->mask & c->tags) == 0) continue;
+
+      wm.current_monitor = c->monitor;
+      monitor_select_tag(c->monitor, t->mask);
+      client_focus(c);
+      return;
+    }
+  }
+}
+
 static void property_notify(xcb_property_notify_event_t *ev) {
   client_t *client = client_get_by_window(ev->window);
   if (client == nullptr) return;
@@ -185,6 +201,7 @@ static void handle_xcb_event(xcb_generic_event_t *event) {
     EVENT(XCB_KEY_RELEASE, key_press);
     EVENT(XCB_CONFIGURE_REQUEST, configure_request);
     EVENT(XCB_MAP_REQUEST, map_request);
+    EVENT(XCB_CLIENT_MESSAGE, client_message);
     EVENT(XCB_PROPERTY_NOTIFY, property_notify);
     EVENT(XCB_UNMAP_NOTIFY, unmap_notify);
     EVENT(XCB_DESTROY_NOTIFY, destroy_notify);