处理窗口创建/销毁和切换 tag 时的窗口焦点

src/client.c

@@ -191,6 +191,8 @@ void client_manage(xcb_window_t window,
   monitor_arrange(c->monitor);
   monitor_draw_bar(c->monitor);
 
+  if (c->tags & c->monitor->selected_tag->mask) client_focus(c);
+
   xcb_flush(wm.xcb_conn);
 }
 
@@ -277,6 +279,7 @@ void client_unmanage(client_t *client) {
 
   client_wipe(client);
 
+  monitor_deal_focus(m);
   monitor_arrange(m);
   monitor_draw_bar(m);
   xcb_flush(wm.xcb_conn);
@@ -295,6 +298,11 @@ void client_apply_task_geometry(client_t *client, task_in_tag_t *task) {
   }
 }
 
+void client_focus(client_t *client) {
+  wm.client_focused = client;
+  xwindow_focus(client ? client->window : XCB_WINDOW_NONE);
+}
+
 bool client_is_visible(client_t *client) {
   return client->tags & client->monitor->selected_tag->mask;
 }

src/monitor.c

@@ -48,6 +48,19 @@ uint32_t monitor_initialize_tag(monitor_t *monitor, const char **tags,
   return tag_count;
 }
 
+void monitor_deal_focus(monitor_t *monitor) {
+  if (!monitor->selected_tag->task_list) return;
+
+  client_t *client = nullptr;
+  for (client_t *c = wm.client_stack_list; c; c = c->stack_next) {
+    if (client_get_task_in_tag(c, monitor->selected_tag)) {
+      client = c;
+      break;
+    }
+  }
+  client_focus(client);
+}
+
 void monitor_select_tag(monitor_t *monitor, uint32_t tag_mask) {
   if (monitor->selected_tag->mask == tag_mask) return;
 
@@ -60,6 +73,8 @@ void monitor_select_tag(monitor_t *monitor, uint32_t tag_mask) {
       break;
     }
   }
+
+  monitor_deal_focus(monitor);
 }
 
 static void tag_clean(tag_t *tag) {

src/monitor.h

@@ -6,6 +6,7 @@
 
 uint32_t monitor_initialize_tag(monitor_t *monitor, const char **tags,
                                 uint32_t tag_index_start_at);
+void monitor_deal_focus(monitor_t *monitor);
 void monitor_select_tag(monitor_t *monitor, uint32_t tag_mask);
 void monitor_clean(monitor_t *monitor);
 void monitor_init_bar(monitor_t *monitor);