diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 6066212..75f37f2 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -3,6 +3,9 @@ cmake_minimum_required(VERSION 3.24)
 set(APP_NAME "zswm")
 set(SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
 
+add_compile_definitions(LOG_FILE="$ENV{HOME}/zswm-log.txt")
+# add_compile_definitions(RELEASE)
+
 # generate compile_commands.json for clangd
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
diff --git a/src/include/event-adapter.h b/src/include/event-adapter.h
index 137a37f..d76b33e 100644
--- a/src/include/event-adapter.h
+++ b/src/include/event-adapter.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <stdint.h>
+#include <xcb/xproto.h>
 
 #include "types.h"
 
@@ -21,6 +22,24 @@ typedef enum event_type_t {
   EVENT_TYPE_CLIENT_MESSAGE,
 } event_type_t;
 
+typedef enum notify_mode_t {
+  notify_mode_normal = 0,
+  notify_mode_grab = 1,
+  notify_mode_ungrab = 2,
+  notify_mode_while_grabbed = 3
+} notify_mode_t;
+
+typedef enum notify_detail_t {
+  notify_detail_ancestor = 0,
+  notify_detail_virtual = 1,
+  notify_detail_inferior = 2,
+  notify_detail_nonlinear = 3,
+  notify_detail_nonlinear_virtual = 4,
+  notify_detail_pointer = 5,
+  notify_detail_pointer_root = 6,
+  notify_detail_none = 7,
+} notify_detail_t;
+
 typedef struct mapping_notify_event_t {
   event_type_t type;
 } mapping_notify_event_t;
@@ -81,10 +100,14 @@ typedef struct motion_notify_event_t {
 
 typedef struct enter_notify_event_t {
   event_type_t type;
+  xcb_window_t window;
+  notify_mode_t mode;
+  notify_detail_t detail;
 } enter_notify_event_t;
 
 typedef struct focus_in_event_t {
   event_type_t type;
+  xcb_window_t window;
 } focus_in_event_t;
 
 typedef struct property_notify_event_t {
diff --git a/src/include/utils.h b/src/include/utils.h
index ca0e84e..b9bb90d 100644
--- a/src/include/utils.h
+++ b/src/include/utils.h
@@ -3,6 +3,7 @@
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <stdio.h>
 #include <sys/time.h>
 
 #include "types.h"
@@ -18,6 +19,14 @@ void *ecalloc(size_t number_of_member, size_t member_size);
 
 bool file_exist(const char *path);
 
+#if defined(RELEASE)
+#define logger(fmt, ...)
+#elif defined(LOG_FILE)
+void logger(const char *fmt, ...);
+#else
+#define logger(fmt, ...) printf(fmt, ##__VA_ARGS__)
+#endif
+
 /**
  * @brief 将 16 进制的颜色配置转换成 uint32 格式的 rgba数据
  *
diff --git a/src/include/xcb.h b/src/include/xcb.h
index d2a9b16..7c76e5c 100644
--- a/src/include/xcb.h
+++ b/src/include/xcb.h
@@ -48,6 +48,7 @@ void map_window(xcb_window_t window);
 char *get_window_name(xcb_window_t window);
 void init_window_event_mask(xcb_window_t window);
 void change_window_border_color(xcb_window_t window, uint32_t argb);
+void focus_window(xcb_window_t window);
 
 typedef struct bar_cairo_params_t {
   xcb_connection_t *conn;
@@ -95,3 +96,12 @@ void grab_keybindings(const keybinding_t *keys, const size_t length);
 bool get_xresource_uint32(const char *name, uint32_t *value);
 void get_xresource_string(const char *name, char **value, const char *fallback);
 void clean_xresource(void);
+
+typedef enum atom_t {
+  atom_wm_protocols,
+  atom_wm_delete,
+  atom_wm_take_focus,
+} atom_t;
+bool send_event(xcb_window_t window, atom_t atom);
+
+bool get_pointer_position(int32_t *x, int32_t *y);
diff --git a/src/main.c b/src/main.c
index dc7313f..49e9906 100644
--- a/src/main.c
+++ b/src/main.c
@@ -40,6 +40,8 @@ static void configure_request(configure_request_event_t *event);
 static void map_request(map_request_event_t *event);
 static void unmap_notify(unmap_notify_event_t *event);
 static void motion_notify(motion_notify_event_t *event);
+static void enter_notify(enter_notify_event_t *event);
+static void focus_in(focus_in_event_t *event);
 static void manage_window(xcb_window_t window);
 static void unmanage_client(client_t *client);
 static void update_client_name(client_t *client);
@@ -56,6 +58,7 @@ static void focus(client_t *client);
 static void unfocus(client_t *client, bool set_focus);
 static void apply_monitor_layout(monitor_t *monitor);
 static client_t *get_client_of_window(xcb_window_t window);
+static monitor_t *get_monitor_of_window(xcb_window_t window);
 static gboolean handle_xcb_event(GIOChannel *channel, GIOCondition condition,
                                  gpointer userdata);
 static void cleanup(void);
@@ -96,22 +99,22 @@ void select_tag(const user_action_arg_t *arg) {
 
 /* 调试函数，开发完成后删除 */
 static void print_monitor_list_info(monitor_t *monitor_list) {
-  printf("========================= monitor info =========================\n");
+  logger("========================= monitor info =========================\n");
   for (monitor_t *m = monitor_list; m; m = m->next) {
-    printf("========== mon[%u]:\n", m->index);
-    printf("x: %d, y: %d, width: %u, height: %u\n", m->monitor_x, m->monitor_y,
+    logger("========== mon[%u]:\n", m->index);
+    logger("x: %d, y: %d, width: %u, height: %u\n", m->monitor_x, m->monitor_y,
            m->monitor_width, m->monitor_height);
-    printf("mon[%u] tags: ", m->index);
+    logger("mon[%u] tags: ", m->index);
     for (int i = 0; m->tags[i]; i++) {
-      printf("%s%s", i > 0 ? ", " : "", m->tags[i]);
+      logger("%s%s", i > 0 ? ", " : "", m->tags[i]);
     }
-    printf("\n");
+    logger("\n");
   }
-  printf("======================= monitor info end =======================\n");
+  logger("======================= monitor info end =======================\n");
 }
 static void print_color(const char *prompt, const color_t *color) {
   const char *p = strlen(prompt) ? " " : "";
-  printf("%s%srgba: #%08x, argb: #%08x\n", prompt, p, color->rgba, color->argb);
+  logger("%s%srgba: #%08x, argb: #%08x\n", prompt, p, color->rgba, color->argb);
 }
 static void print_color_set(color_set_t *set) {
   print_color("== bar bg:", &set->bar_bg);
@@ -128,54 +131,54 @@ static void print_color_set(color_set_t *set) {
 }
 static void print_wallpaper_config(wallpaper_config_t *config) {
   if (!config) {
-    printf("no wallpaper\n");
+    logger("no wallpaper\n");
     return;
   }
 
-  printf("wallpaper count: %u\n", config->count);
+  logger("wallpaper count: %u\n", config->count);
   for (uint32_t i = 0; i < config->count; i++) {
-    printf("wallpaper[%02u]: %s\n", i, config->path_list[i]);
+    logger("wallpaper[%02u]: %s\n", i, config->path_list[i]);
   }
 }
 static void print_window_list(window_list_t *window_list) {
   if (!window_list) {
-    printf("no window\n");
+    logger("no window\n");
     return;
   }
 
   for (uint32_t i = 0; i < window_list->count; i++) {
-    printf("window[%u]: 0x%x\n", i, window_list->list[i]);
+    logger("window[%u]: 0x%x\n", i, window_list->list[i]);
   }
 }
 static char *bool2string(bool b) { return b ? "true" : "false"; }
 static void print_client(client_t *c) {
   if (!c) return;
 
-  printf("======= client info ========\n");
-  printf("window: 0x%x, x: %d, y: %d, w: %u, h: %u, bw: %u\n", c->window, c->x,
+  logger("======= client info ========\n");
+  logger("window: 0x%x, x: %d, y: %d, w: %u, h: %u, bw: %u\n", c->window, c->x,
          c->y, c->width, c->height, c->border_width);
-  printf("floating: %s, fullscreen: %s, maximize: %s\n",
+  logger("floating: %s, fullscreen: %s, maximize: %s\n",
          bool2string(c->floating), bool2string(c->fullscreen),
          bool2string(c->maximize));
-  printf("tags: %b, monitor selected tags: %b\n", c->tags,
+  logger("tags: %b, monitor selected tags: %b\n", c->tags,
          c->monitor->selected_tags);
-  printf("name: %s\n", c->name);
-  printf("===== client info end ======\n");
+  logger("name: %s\n", c->name);
+  logger("===== client info end ======\n");
 }
 static void print_rule(const rule_t *r) {
-  printf("==================== rule ====================\n");
-  printf("class: %s, instance: %s, title: %s\n", r->class, r->instance,
+  logger("==================== rule ====================\n");
+  logger("class: %s, instance: %s, title: %s\n", r->class, r->instance,
          r->title);
-  printf("floating: %s, maximize: %s, fullscreen: %s, switch to tag: %s\n",
+  logger("floating: %s, maximize: %s, fullscreen: %s, switch to tag: %s\n",
          bool2string(r->action.floating), bool2string(r->action.maximize),
          bool2string(r->action.fullscreen),
          bool2string(r->action.switch_to_tag));
   for (uint32_t i = 0; r->tag && r->tag[i].tags; i++) {
     const rule_tag_t *t = &r->tag[i];
-    printf("monitor amount: %u, monitor index: %u, tags: %b\n",
+    logger("monitor amount: %u, monitor index: %u, tags: %b\n",
            t->monitor_amount, t->monitor_index, t->tags);
   }
-  printf("================== rule end ==================\n");
+  logger("================== rule end ==================\n");
 }
 /* 调试函数结束 */
 
@@ -279,7 +282,7 @@ void set_wallpaper_by_index(uint32_t index, wallpaper_config_t *config) {
     set_wallpaper(wallpaper);
     double end = get_time();
     free(wallpaper);
-    printf("set wallpaper cost: %fs\n", end - start);
+    logger("set wallpaper cost: %fs\n", end - start);
   }
 
   free(screen_size);
@@ -413,7 +416,7 @@ void init_monitor_bar(void) {
 
     m->cr = cr;
   }
-  printf("font height: %u, bar height: %u\n", font_height, bar_height);
+  logger("font height: %u, bar height: %u\n", font_height, bar_height);
 }
 
 void get_xresource_config(void) {
@@ -424,7 +427,7 @@ void get_xresource_config(void) {
   get_xresource_uint32("zswm.tag_x_padding", &tag_x_pad);
   get_xresource_uint32("zswm.border_width", &border_px);
 
-  printf("dpi: %u, font family: %s, font  size: %u\n", dpi, font_family,
+  logger("dpi: %u, font family: %s, font  size: %u\n", dpi, font_family,
          font_size);
   clean_xresource();
 }
@@ -460,6 +463,8 @@ void xcb_event_handler(generic_event_t *event, void *user_data) {
     EVENT(EVENT_TYPE_MAP_REQUEST, map_request);
     EVENT(EVENT_TYPE_UNMAP_NOTIFY, unmap_notify);
     EVENT(EVENT_TYPE_MOTION_NOTIFY, motion_notify);
+    EVENT(EVENT_TYPE_ENTER_NOTIFY, enter_notify);
+    EVENT(EVENT_TYPE_FOCUS_IN, focus_in);
 
 #undef EVENT
 
@@ -487,7 +492,7 @@ void configure_request(configure_request_event_t *event) {
   } else {
     configure_window(client->window, client->x, client->y, client->width,
                      client->height, client->border_width);
-    printf("configure request: %s\n", client->name);
+    logger("configure request: %s\n", client->name);
   }
 
   flush_xcb_connection();
@@ -509,6 +514,10 @@ void unmap_notify(unmap_notify_event_t *event) {
 }
 
 void motion_notify(motion_notify_event_t *event) {
+  logger("motion: window: 0x%x, root: 0x%x\n", event->window, event->root);
+  logger("x: %d, y: %d, root_x: %d, root_y: %d\n", event->x, event->y,
+         event->root_x, event->root_y);
+  logger("root window: 0x%x\n", get_root_window());
   if (event->window != get_root_window()) return;
 
   static monitor_t *mon = NULL;
@@ -521,6 +530,31 @@ void motion_notify(motion_notify_event_t *event) {
   mon = m;
 }
 
+void enter_notify(enter_notify_event_t *event) {
+  if ((event->mode != notify_mode_normal ||
+       event->detail == notify_detail_inferior) &&
+      event->window != get_root_window()) {
+    return;
+  }
+  client_t *c = get_client_of_window(event->window);
+  monitor_t *m = c ? c->monitor : get_monitor_of_window(event->window);
+  if (m != current_monitor) {
+    unfocus(current_monitor->selected_client, true);
+    current_monitor = m;
+  } else if (!c || c == current_monitor->selected_client) {
+    return;
+  }
+  focus(c);
+}
+
+void focus_in(focus_in_event_t *event) {
+  if (current_monitor->selected_client &&
+      event->window != current_monitor->selected_client->window) {
+    focus_window(event->window);
+    send_event(event->window, atom_wm_take_focus);
+  }
+}
+
 void manage_window(xcb_window_t window) {
   window_geometry_t *geometry = get_window_geometry(window);
   client_t *c = ecalloc(1, sizeof(client_t));
@@ -533,8 +567,8 @@ void manage_window(xcb_window_t window) {
   c->border_width = border_px;
   update_client_name(c);
 
-  printf("== manage window: %u\n", window);
-  printf("== x: %d, y: %d, w: %u, h: %u, bw: %u\n", c->x, c->y, c->width,
+  logger("== manage window: %u\n", window);
+  logger("== x: %d, y: %d, w: %u, h: %u, bw: %u\n", c->x, c->y, c->width,
          c->height, c->border_width);
 
   xcb_window_t tw = get_transient_window_for(window);
@@ -551,9 +585,12 @@ void manage_window(xcb_window_t window) {
   attach_stack_client(c);
   init_window_event_mask(window);
   change_window_border_color(window, color_set->border_color.argb);
+  if (c->monitor == current_monitor) {
+    unfocus(current_monitor->selected_client, false);
+  }
   arrange(c->monitor);
   map_window(window);
-  draw_all_monitor_bars();
+  focus(NULL);
 }
 
 void unmanage_client(client_t *client) {
@@ -626,7 +663,7 @@ void apply_rules(client_t *client) {
   }
 
   print_client(client);
-  printf("apply rules done\n");
+  logger("apply rules done\n");
 }
 
 uint32_t get_tags_mask_of_monitor(monitor_t *monitor) {
@@ -681,16 +718,33 @@ void restack(monitor_t *monitor) {
   /* TODO: */
 }
 void focus(client_t *client) {
-  /* TODO: */
+  if (!client || !CLIENT_VISIBLE(client)) {
+    for (client = current_monitor->clients_stack;
+         client && !CLIENT_VISIBLE(client); client = client->stack_next);
+  }
+  if (current_monitor->selected_client &&
+      current_monitor->selected_client != client) {
+    unfocus(current_monitor->selected_client, false);
+  }
+  if (client) {
+    if (client->monitor != current_monitor) current_monitor = client->monitor;
+    detach_stack_client(client);
+    attach_stack_client(client);
+    change_window_border_color(client->window,
+                               color_set->active_border_color.argb);
+    focus_window(client->window);
+  } else {
+    focus_window(WINDOW_NONE);
+  }
+
   current_monitor->selected_client = client;
   draw_all_monitor_bars();
 }
 void unfocus(client_t *client, bool set_focus) {
   if (!client) return;
+
   change_window_border_color(client->window, color_set->border_color.argb);
-  if (set_focus) {
-    /* TODO: */
-  }
+  if (set_focus) focus_window(WINDOW_NONE);
 }
 
 void show_hide_client(client_t *client) {
@@ -741,6 +795,22 @@ client_t *get_client_of_window(xcb_window_t window) {
   return NULL;
 }
 
+monitor_t *get_monitor_of_window(xcb_window_t window) {
+  int32_t x, y;
+  if (window == get_root_window() && get_pointer_position(&x, &y)) {
+    return rect_to_monitor(monitors, x, y, 1, 1);
+  }
+
+  for (monitor_t *m = monitors; m; m = m->next) {
+    if (window == m->bar_window) return m;
+  }
+
+  client_t *c = get_client_of_window(window);
+  if (c) return c->monitor;
+
+  return current_monitor;
+}
+
 gboolean handle_xcb_event(GIOChannel *channel, GIOCondition condition,
                           gpointer userdata) {
   if (condition & (G_IO_HUP | G_IO_ERR)) {
diff --git a/src/utils.c b/src/utils.c
index 0e67a4a..0e1e58e 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -44,6 +44,17 @@ bool file_exist(const char *path) {
   return access(path, R_OK) == 0;
 }
 
+#if (!defined(RELEASE)) && defined(LOG_FILE)
+void logger(const char *fmt, ...) {
+  va_list ap;
+  va_start(ap, fmt);
+  FILE *log_file = fopen(LOG_FILE, "a+t");
+  vfprintf(log_file, fmt, ap);
+  va_end(ap);
+  fclose(log_file);
+}
+#endif
+
 bool hex_color_to_rgba(const char *hex, uint32_t *rgba) {
   if (hex[0] == '#') hex++;
 
diff --git a/src/xcb/CMakeLists.txt b/src/xcb/CMakeLists.txt
index 6ad5466..8db662e 100644
--- a/src/xcb/CMakeLists.txt
+++ b/src/xcb/CMakeLists.txt
@@ -1,7 +1,7 @@
 set(LIB_XCB "zswm-xcb")
 set(LIB_XCB_NAME ${LIB_XCB} PARENT_SCOPE)
 
-add_library(${LIB_XCB} STATIC xcb.c window.c res.c cursor.c event.c)
+add_library(${LIB_XCB} STATIC xcb.c window.c res.c cursor.c event.c wm-extension.c)
 
 target_include_directories(${LIB_XCB} SYSTEM
     PRIVATE ${XCB_INCLUDE_DIRS}
diff --git a/src/xcb/event.c b/src/xcb/event.c
index 3683943..91d2f95 100644
--- a/src/xcb/event.c
+++ b/src/xcb/event.c
@@ -1,5 +1,4 @@
 #include <stdint.h>
-#include <stdio.h>
 #include <stdlib.h>
 #include <xcb/xcb.h>
 #include <xcb/xcb_event.h>
@@ -19,7 +18,7 @@ static void convert_event(xcb_generic_event_t *xcb_event,
                           generic_event_t *event) {
   uint8_t event_type = XCB_EVENT_RESPONSE_TYPE(xcb_event);
   const char *label = xcb_event_get_label(event_type);
-  printf("=========================== %s ===========================\n", label);
+  logger("=========================== %s ===========================\n", label);
   switch (event_type) {
     case XCB_MAPPING_NOTIFY:
       event->type = EVENT_TYPE_MAPPING_NOTIFY;
@@ -84,12 +83,19 @@ static void convert_event(xcb_generic_event_t *xcb_event,
       event->motiion_notify.y = ev->event_y;
       break;
     }
-    case XCB_ENTER_NOTIFY:
-      event->type = EVENT_TYPE_ENTER_NOTIFY;
-      break;
-    case XCB_FOCUS_IN:
-      event->type = EVENT_TYPE_FOCUS_IN;
+    case XCB_ENTER_NOTIFY: {
+      xcb_enter_notify_event_t *ev = (xcb_enter_notify_event_t *)xcb_event;
+      event->enter_notify.type = EVENT_TYPE_ENTER_NOTIFY;
+      event->enter_notify.window = ev->event;
+      event->enter_notify.mode = ev->mode;
+      event->enter_notify.detail = ev->detail;
       break;
+    }
+    case XCB_FOCUS_IN: {
+      xcb_focus_in_event_t *ev = (xcb_focus_in_event_t *)xcb_event;
+      event->focus_in.type = EVENT_TYPE_FOCUS_IN;
+      event->focus_in.window = ev->event;
+    } break;
     case XCB_PROPERTY_NOTIFY:
       event->type = EVENT_TYPE_PROPERTY_NOTIFY;
       break;
@@ -97,6 +103,7 @@ static void convert_event(xcb_generic_event_t *xcb_event,
       event->type = EVENT_TYPE_CLIENT_MESSAGE;
       break;
     default:
+      event->type = -1;
       return;
   }
 }
diff --git a/src/xcb/window.c b/src/xcb/window.c
index 00b76d8..6d3a754 100644
--- a/src/xcb/window.c
+++ b/src/xcb/window.c
@@ -285,3 +285,19 @@ void change_window_border_color(xcb_window_t window, uint32_t argb) {
   xcb_params_cw_t params = {.border_pixel = argb};
   xcb_aux_change_window_attributes(conn, window, XCB_CW_BORDER_PIXEL, &params);
 }
+
+void focus_window(xcb_window_t window) {
+  xcb_window_t root = screen->root;
+  if (window == WINDOW_NONE) {
+    xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, root,
+                        XCB_CURRENT_TIME);
+    xcb_delete_property(conn, root, ewmh->_NET_ACTIVE_WINDOW);
+  } else {
+    xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, window,
+                        XCB_CURRENT_TIME);
+    xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root,
+                        ewmh->_NET_ACTIVE_WINDOW, XCB_ATOM_WINDOW, 32, 1,
+                        &window);
+    send_event(window, atom_wm_take_focus);
+  }
+}
diff --git a/src/xcb/wm-extension.c b/src/xcb/wm-extension.c
new file mode 100644
index 0000000..f6f711c
--- /dev/null
+++ b/src/xcb/wm-extension.c
@@ -0,0 +1,127 @@
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+#include <xcb/xcb.h>
+#include <xcb/xcb_icccm.h>
+#include <xcb/xproto.h>
+
+#include "app.h"
+#include "utils.h"
+#include "window.h"
+#include "xcb-private.h"
+#include "xcb.h"
+
+xcb_ewmh_connection_t *ewmh = NULL;
+static bool ewmh_init_failed = false;
+static xcb_window_t wm_check_window = XCB_NONE;
+
+typedef struct atom_name_map_t {
+  const atom_t atom;
+  const char *name;
+  xcb_atom_t xcb_atom;
+} atom_map_t;
+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"},
+};
+
+void init_icccm_extension(void) {
+  xcb_intern_atom_cookie_t cookie;
+  for (int i = 0; i < LENGTH(atom_map); i++) {
+    const char *name = atom_map[i].name;
+    cookie = xcb_intern_atom(conn, false, strlen(name), name);
+    xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(conn, cookie, NULL);
+    atom_map[i].xcb_atom = reply->atom;
+    free(reply);
+  }
+}
+
+void init_ewmh_extension(void) {
+  if (ewmh || ewmh_init_failed) return;
+
+  ewmh = ecalloc(1, sizeof(xcb_ewmh_connection_t));
+  xcb_intern_atom_cookie_t *cookie = xcb_ewmh_init_atoms(conn, ewmh);
+  if (!xcb_ewmh_init_atoms_replies(ewmh, cookie, NULL)) {
+    free(ewmh);
+    ewmh = NULL;
+    ewmh_init_failed = true;
+    return;
+  }
+
+  wm_check_window = xcb_generate_id(conn);
+  xcb_create_window(conn, XCB_COPY_FROM_PARENT, wm_check_window, screen->root,
+                    0, 0, 1, 1, 0, XCB_WINDOW_CLASS_INPUT_ONLY,
+                    screen->root_visual, XCB_NONE, NULL);
+  const char *class = APP_NAME "_wm_check";
+  set_window_class_instance(wm_check_window, class, class);
+  xcb_ewmh_set_wm_name(ewmh, wm_check_window, strlen(APP_NAME), APP_NAME);
+  xcb_ewmh_set_supporting_wm_check(ewmh, screen->root, wm_check_window);
+  xcb_ewmh_set_supporting_wm_check(ewmh, wm_check_window, wm_check_window);
+
+  uint8_t mode = XCB_PROP_MODE_REPLACE;
+  xcb_atom_t atom = XCB_ATOM_ATOM;
+  const xcb_atom_t state[] = {ewmh->_NET_WM_STATE_STICKY};
+  const xcb_atom_t supported[] = {
+    ewmh->_NET_ACTIVE_WINDOW,
+    ewmh->_NET_SUPPORTED,
+    ewmh->_NET_WM_NAME,
+    ewmh->_NET_WM_STATE,
+    ewmh->_NET_SUPPORTING_WM_CHECK,
+    ewmh->_NET_WM_STATE_FULLSCREEN,
+    ewmh->_NET_WM_WINDOW_TYPE,
+    ewmh->_NET_WM_WINDOW_TYPE_DIALOG,
+    ewmh->_NET_CLIENT_LIST,
+  };
+  xcb_change_property(conn, mode, wm_check_window, ewmh->_NET_WM_STATE, atom,
+                      32, LENGTH(state), state);
+  xcb_change_property(conn, mode, screen->root, ewmh->_NET_SUPPORTED, atom, 32,
+                      LENGTH(supported), supported);
+  xcb_delete_property(conn, screen->root, ewmh->_NET_CLIENT_LIST);
+}
+
+void clean_ewmh_extension(void) {
+  if (wm_check_window != XCB_NONE) {
+    xcb_destroy_window(conn, wm_check_window);
+    wm_check_window = XCB_NONE;
+  }
+
+  if (ewmh) {
+    if (!ewmh_init_failed) {
+      xcb_ewmh_connection_wipe(ewmh);
+    }
+    free(ewmh);
+    ewmh_init_failed = false;
+    ewmh = NULL;
+  }
+}
+
+bool send_event(xcb_window_t window, atom_t atom) {
+  if (atom < 0 || atom >= LENGTH(atom_map)) return false;
+
+  bool exist = false;
+
+  xcb_atom_t xcb_atom = atom_map[atom].xcb_atom;
+  xcb_get_property_cookie_t cookie =
+    xcb_icccm_get_wm_protocols(conn, window, xcb_atom);
+  xcb_icccm_get_wm_protocols_reply_t reply;
+  if (xcb_icccm_get_wm_protocols_reply(conn, cookie, &reply, NULL)) {
+    for (uint32_t i = 0; !exist && i < reply.atoms_len; i++) {
+      exist = reply.atoms[i] == xcb_atom;
+    }
+    xcb_icccm_get_wm_protocols_reply_wipe(&reply);
+  }
+
+  if (exist) {
+    xcb_client_message_event_t ev = {
+      .response_type = XCB_CLIENT_MESSAGE,
+      .format = 32,
+      .window = window,
+      .type = atom_map[atom_wm_protocols].xcb_atom,
+      .data = {.data32 = {xcb_atom, XCB_CURRENT_TIME, 0, 0, 0}},
+    };
+    xcb_send_event(conn, false, window, XCB_EVENT_MASK_NO_EVENT, (char *)&ev);
+  }
+
+  return exist;
+}
diff --git a/src/xcb/xcb-private.h b/src/xcb/xcb-private.h
index b1dc116..d9db441 100644
--- a/src/xcb/xcb-private.h
+++ b/src/xcb/xcb-private.h
@@ -12,3 +12,7 @@ extern xcb_key_symbols_t *key_symbols;
 
 xcb_cursor_t get_xcb_cursor(cursor_t cursor);
 void clean_xcb_cursor(void);
+
+void init_icccm_extension(void);
+void init_ewmh_extension(void);
+void clean_ewmh_extension(void);
diff --git a/src/xcb/xcb.c b/src/xcb/xcb.c
index ddb21e7..e380a47 100644
--- a/src/xcb/xcb.c
+++ b/src/xcb/xcb.c
@@ -15,7 +15,6 @@
 
 #include "app.h"
 #include "utils.h"
-#include "window.h"
 #include "xcb-private.h"
 
 xcb_connection_t *conn = NULL;
@@ -170,58 +169,13 @@ void set_wallpaper(uint32_t *wallpaper_data) {
   xcb_flush(conn);
 }
 
-xcb_ewmh_connection_t *ewmh = NULL;
-static bool ewmh_init_failed = false;
-static xcb_window_t wm_check_window = XCB_NONE;
-static void init_ewmh_extension(void) {
-  if (ewmh || ewmh_init_failed) return;
-
-  ewmh = ecalloc(1, sizeof(xcb_ewmh_connection_t));
-  xcb_intern_atom_cookie_t *cookie = xcb_ewmh_init_atoms(conn, ewmh);
-  if (!xcb_ewmh_init_atoms_replies(ewmh, cookie, NULL)) {
-    free(ewmh);
-    ewmh = NULL;
-    ewmh_init_failed = true;
-    return;
-  }
-
-  wm_check_window = xcb_generate_id(conn);
-  xcb_create_window(conn, XCB_COPY_FROM_PARENT, wm_check_window, screen->root,
-                    0, 0, 1, 1, 0, XCB_WINDOW_CLASS_INPUT_ONLY,
-                    screen->root_visual, XCB_NONE, NULL);
-  const char *class = APP_NAME "_wm_check";
-  set_window_class_instance(wm_check_window, class, class);
-  xcb_ewmh_set_wm_name(ewmh, wm_check_window, strlen(APP_NAME), APP_NAME);
-  xcb_ewmh_set_supporting_wm_check(ewmh, screen->root, wm_check_window);
-  xcb_ewmh_set_supporting_wm_check(ewmh, wm_check_window, wm_check_window);
-
-  uint8_t mode = XCB_PROP_MODE_REPLACE;
-  xcb_atom_t atom = XCB_ATOM_ATOM;
-  const xcb_atom_t state[] = {ewmh->_NET_WM_STATE_STICKY};
-  const xcb_atom_t supported[] = {
-    ewmh->_NET_ACTIVE_WINDOW,
-    ewmh->_NET_SUPPORTED,
-    ewmh->_NET_WM_NAME,
-    ewmh->_NET_WM_STATE,
-    ewmh->_NET_SUPPORTING_WM_CHECK,
-    ewmh->_NET_WM_STATE_FULLSCREEN,
-    ewmh->_NET_WM_WINDOW_TYPE,
-    ewmh->_NET_WM_WINDOW_TYPE_DIALOG,
-    ewmh->_NET_CLIENT_LIST,
-  };
-  xcb_change_property(conn, mode, wm_check_window, ewmh->_NET_WM_STATE, atom,
-                      32, LENGTH(state), state);
-  xcb_change_property(conn, mode, screen->root, ewmh->_NET_SUPPORTED, atom, 32,
-                      LENGTH(supported), supported);
-  xcb_delete_property(conn, screen->root, ewmh->_NET_CLIENT_LIST);
-}
-
 /**
  * 扫描窗口列表
  * @returns 若无窗口，返回 NULL，否则返回窗口列表
  * @note: 返回的窗口列表数据使用完后使用 free_window_list 释放
  */
 window_list_t *scan_window_list(void) {
+  init_icccm_extension();
   init_ewmh_extension();
 
   xcb_query_tree_cookie_t cookie = xcb_query_tree(conn, screen->root);
@@ -278,21 +232,7 @@ void free_window_list(window_list_t *window_list) {
 
 void clean_xcb(void) {
   clean_xcb_cursor();
-
-  if (wm_check_window != XCB_NONE) {
-    xcb_destroy_window(conn, wm_check_window);
-    wm_check_window = XCB_NONE;
-  }
-
-  if (ewmh) {
-    if (!ewmh_init_failed) {
-      xcb_ewmh_connection_wipe(ewmh);
-    }
-    free(ewmh);
-    ewmh_init_failed = false;
-    ewmh = NULL;
-  }
-
+  clean_ewmh_extension();
   xcb_disconnect(conn);
   conn = NULL;
   screen = NULL;
@@ -322,3 +262,18 @@ void grab_keybindings(const keybinding_t *keys, const size_t length) {
     }
   }
 }
+
+bool get_pointer_position(int32_t *x, int32_t *y) {
+  xcb_query_pointer_cookie_t cookie = xcb_query_pointer(conn, screen->root);
+  xcb_query_pointer_reply_t *reply =
+    xcb_query_pointer_reply(conn, cookie, NULL);
+
+  if (reply) {
+    *x = reply->root_x;
+    *y = reply->root_y;
+    free(reply);
+    return true;
+  }
+
+  return false;
+}