From 0c361a6593f0a76323e033266b90a8d038acf9d4 Mon Sep 17 00:00:00 2001
From: Zedhugh Chen <zedhugh@gmail.com>
Date: Mon, 1 Sep 2025 17:55:20 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A4=84=E7=90=86=20EWMH=20=E6=89=A9=E5=B1=95?=
 =?UTF-8?q?=E7=9A=84=20=5FNET=5FACTIVE=5FWINDOW=20=E5=8D=8F=E8=AE=AE?=
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---
 src/include/xcb.h      |  1 +
 src/main.c             | 18 ++++++++++++++++++
 src/xcb/wm-extension.c |  1 +
 3 files changed, 20 insertions(+)

diff --git a/src/include/xcb.h b/src/include/xcb.h
index 2f33b3f..124a1be 100644
--- a/src/include/xcb.h
+++ b/src/include/xcb.h
@@ -126,6 +126,7 @@ typedef enum atom_t {
   atom_wm_protocols,
   atom_wm_delete,
   atom_wm_take_focus,
+  atom_net_active_window,
   atom_net_wm_name,
   atom_net_wm_state,
   atom_net_wm_fullscreen,
diff --git a/src/main.c b/src/main.c
index bf0a755..c4a06a3 100644
--- a/src/main.c
+++ b/src/main.c
@@ -909,6 +909,24 @@ void client_message(client_message_event_t *event) {
       bool toggle_to_fullscreen = event->data.data32[0] == 2 && !c->fullscreen;
       set_client_fullscreen(c, set_fullscreen || toggle_to_fullscreen);
     }
+  } else if (event->message_type == get_xcb_atom(atom_net_active_window)) {
+    client_t *client = get_client_of_window(event->window);
+    if (client) {
+      logger("==== _NET_ACTIVE_WINDOW\n");
+      print_client(client);
+
+      uint32_t tag_mask = 0;
+      for (uint32_t i = 0; i < g_strv_length(client->monitor->tags); i++) {
+        tag_mask |= 1 << i;
+      }
+      uint32_t target_tag = tag_mask & client->tags;
+      const user_action_arg_t arg = {.ui = target_tag};
+
+      current_monitor = client->monitor;
+      select_tag(&arg);
+      focus(client);
+      restack(current_monitor);
+    }
   }
 }
 
diff --git a/src/xcb/wm-extension.c b/src/xcb/wm-extension.c
index b0f0adf..f2c1808 100644
--- a/src/xcb/wm-extension.c
+++ b/src/xcb/wm-extension.c
@@ -26,6 +26,7 @@ static atom_map_t atom_map[] = {
   {.atom = atom_wm_protocols, .name = "WM_PROTOCOLS"},
   {.atom = atom_wm_delete, .name = "WM_DELETE_WINDOW"},
   {.atom = atom_wm_take_focus, .name = "WM_TAKE_FOCUS"},
+  {.atom = atom_net_active_window, .name = "_NET_ACTIVE_WINDOW"},
   {.atom = atom_net_wm_name, .name = "_NET_WM_NAME"},
   {.atom = atom_net_wm_state, .name = "_NET_WM_STATE"},
   {.atom = atom_net_wm_fullscreen, .name = "_NET_WM_STATE_FULLSCREEN"},