From 9f9adf7e2eb033a5ce7fd2c21721bc27dfb9705d Mon Sep 17 00:00:00 2001
From: Zedhugh Chen <zedhugh@gmail.com>
Date: Tue, 16 Jun 2026 23:33:05 +0800
Subject: [PATCH] =?UTF-8?q?feat(backend):=20=E5=86=99=E5=85=A5=20=5FNET=5F?=
 =?UTF-8?q?SUPPORTED=20=E5=B1=9E=E6=80=A7=E5=A3=B0=E6=98=8E=20EWMH=20?=
 =?UTF-8?q?=E6=94=AF=E6=8C=81=E8=83=BD=E5=8A=9B?=
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---
 src/backend/x11/backend.c  | 15 +++++++++++++++
 src/backend/x11/internal.h | 30 +++++++++++++++++-------------
 2 files changed, 32 insertions(+), 13 deletions(-)

diff --git a/src/backend/x11/backend.c b/src/backend/x11/backend.c
index 20d8205..b8b9247 100644
--- a/src/backend/x11/backend.c
+++ b/src/backend/x11/backend.c
@@ -60,6 +60,21 @@ static void atoms_init(backend_t *backend) {
     *atom->atom       = reply->atom;
     p_delete(&reply);
   }
+
+#define EWMH_ITEM(name) atoms->name,
+  xcb_atom_t ewmh_supported_atoms[] = {EWMH_ATOMS(EWMH_ITEM)};
+#undef EWMH_ITEM
+  auto root = backend->screen->root;
+  xcb_change_property(
+    conn,
+    XCB_PROP_MODE_REPLACE,
+    root,
+    atoms->_NET_SUPPORTED,
+    XCB_ATOM_ATOM,
+    32,
+    countof(ewmh_supported_atoms),
+    ewmh_supported_atoms
+  );
 }
 
 static void create_wm_check_window(backend_t *backend) {
diff --git a/src/backend/x11/internal.h b/src/backend/x11/internal.h
index 7a19ca7..524c89c 100644
--- a/src/backend/x11/internal.h
+++ b/src/backend/x11/internal.h
@@ -9,21 +9,9 @@
 #include "base/window_list.h"
 #include "core/event.h"
 
-#define ATOM_LIST(X)                   \
-  X(COMPOUND_TEXT)                     \
-  X(UTF8_STRING)                       \
-                                       \
-  X(WM_WINDOW_ROLE)                    \
-  X(WM_NAME)                           \
-  X(WM_CHANGE_STATE)                   \
+#define EWMH_ATOMS(X)                  \
   X(_NET_WM_NAME)                      \
-                                       \
-  X(WM_PROTOCOLS)                      \
-  X(WM_TAKE_FOCUS)                     \
-  X(WM_DELETE_WINDOW)                  \
   X(_NET_ACTIVE_WINDOW)                \
-                                       \
-  X(_NET_SUPPORTING_WM_CHECK)          \
   X(_NET_WM_PID)                       \
                                        \
   X(_NET_CLIENT_LIST)                  \
@@ -56,6 +44,22 @@
   X(_NET_WM_WINDOW_TYPE_DND)           \
   X(_NET_WM_WINDOW_TYPE_NOTIFICATION)
 
+#define ATOM_LIST(X)          \
+  X(COMPOUND_TEXT)            \
+  X(UTF8_STRING)              \
+                              \
+  X(WM_WINDOW_ROLE)           \
+  X(WM_NAME)                  \
+  X(WM_CHANGE_STATE)          \
+                              \
+  X(WM_PROTOCOLS)             \
+  X(WM_TAKE_FOCUS)            \
+  X(WM_DELETE_WINDOW)         \
+                              \
+  X(_NET_SUPPORTING_WM_CHECK) \
+  X(_NET_SUPPORTED)           \
+  EWMH_ATOMS(X)
+
 typedef struct atoms_t {
 #define DECLARATION_ATOM(name) xcb_atom_t name;
   ATOM_LIST(DECLARATION_ATOM);