diff --git a/CMakeLists.txt b/CMakeLists.txt
index 726b071..42ddb7b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -45,6 +45,7 @@ add_executable(${APP_NAME}
     ${SOURCE_DIR}/core/event.c
     ${SOURCE_DIR}/core/layer.c
     ${SOURCE_DIR}/core/layout.c
+    ${SOURCE_DIR}/core/listeners.c
     ${SOURCE_DIR}/core/plan.c
     ${SOURCE_DIR}/core/policy.c
     ${SOURCE_DIR}/core/rules.c
diff --git a/include/zdwm/config.h b/include/zdwm/config.h
index bcbe600..075ec64 100644
--- a/include/zdwm/config.h
+++ b/include/zdwm/config.h
@@ -6,6 +6,7 @@
 #include <stdint.h>
 #include <zdwm/action.h>
 #include <zdwm/layout.h>
+#include <zdwm/listeners.h>
 #include <zdwm/rules.h>
 #include <zdwm/types.h>
 
@@ -155,6 +156,57 @@ typedef struct zdwm_api_t {
     const char *normal,
     const char *focused
   );
+
+  /** @name Listener 注册
+   * @{ */
+
+  void (*subscribe_current_output)(
+    zdwm_config_builder_t *builder,
+    zdwm_current_output_id_listener *fn,
+    void *user_data
+  );
+  void (*subscribe_initial_workspace_list)(
+    zdwm_config_builder_t *builder,
+    zdwm_initial_workspace_list *fn,
+    void *user_data
+  );
+  void (*subscribe_workspace_active)(
+    zdwm_config_builder_t *builder,
+    zdwm_workspace_active_updated *fn,
+    void *user_data
+  );
+  void (*subscribe_layout)(
+    zdwm_config_builder_t *builder,
+    zdwm_layout_notify *fn,
+    void *user_data
+  );
+  void (*subscribe_binding_mode)(
+    zdwm_config_builder_t *builder,
+    zdwm_binding_mode_notify *fn,
+    void *user_data
+  );
+  void (*subscribe_initial_window_list)(
+    zdwm_config_builder_t *builder,
+    zdwm_initial_window_list *fn,
+    void *user_data
+  );
+  void (*subscribe_window_added)(
+    zdwm_config_builder_t *builder,
+    zdwm_window_added *fn,
+    void *user_data
+  );
+  void (*subscribe_window_updated)(
+    zdwm_config_builder_t *builder,
+    zdwm_window_updated *fn,
+    void *user_data
+  );
+  void (*subscribe_window_removed)(
+    zdwm_config_builder_t *builder,
+    zdwm_window_removed *fn,
+    void *user_data
+  );
+
+  /** @} */
 } zdwm_api_t;
 
 /**
diff --git a/include/zdwm/listeners.h b/include/zdwm/listeners.h
new file mode 100644
index 0000000..9cd30e8
--- /dev/null
+++ b/include/zdwm/listeners.h
@@ -0,0 +1,63 @@
+#ifndef ZDWM_LISTENERS_H
+#define ZDWM_LISTENERS_H
+
+#include <stddef.h>
+#include <zdwm/types.h>
+
+typedef void
+zdwm_current_output_id_listener(zdwm_output_id_t output_id, void *user_data);
+
+typedef struct zdwm_workspace_t {
+  zdwm_output_id_t output_id;
+  zdwm_workspace_id_t id;
+  const char *name; /* 不持有内存 */
+} zdwm_workspace_t;
+typedef void zdwm_initial_workspace_list(
+  const zdwm_workspace_t *list,
+  size_t count,
+  void *user_data
+);
+typedef void zdwm_workspace_active_updated(
+  zdwm_output_id_t output_id,
+  zdwm_workspace_id_t workspace_id,
+  void *user_data
+);
+
+typedef struct zdwm_layout_notify_t {
+  zdwm_workspace_id_t workspace;
+  zdwm_layout_id_t id;
+  const char *symbol; /* 不持有内存 */
+} zdwm_layout_notify_t;
+typedef void zdwm_layout_notify(zdwm_layout_notify_t layout, void *user_data);
+
+typedef struct zdwm_binding_mode_notify_t {
+  bool is_default_mode;
+  bool is_current_mode;
+  zdwm_binding_mode_id_t id;
+  const char *name; /* 不持有内存 */
+} zdwm_binding_mode_notify_t;
+typedef void zdwm_binding_mode_notify(
+  zdwm_binding_mode_notify_t binding_mode,
+  void *user_data
+);
+
+typedef struct zdwm_window_t {
+  zdwm_workspace_id_t workspace;
+  zdwm_window_id_t id;
+  const char *title; /* 不持有内存 */
+  bool focused;
+  bool urgent;
+  bool skip_taskbar;
+} zdwm_window_t;
+typedef void zdwm_initial_window_list(
+  const zdwm_window_t *list,
+  size_t count,
+  void *user_data
+);
+typedef void zdwm_window_added(const zdwm_window_t *window, void *user_data);
+typedef void zdwm_window_updated(const zdwm_window_t *window, void *user_data);
+typedef void zdwm_window_removed(zdwm_window_id_t window_id, void *user_data);
+
+typedef struct zdwm_listeners_t zdwm_listeners_t;
+
+#endif /* ZDWM_LISTENERS_H */
diff --git a/include/zdwm/types.h b/include/zdwm/types.h
index b5a3929..3a2bbea 100644
--- a/include/zdwm/types.h
+++ b/include/zdwm/types.h
@@ -7,6 +7,7 @@
 extern "C" {
 #endif
 
+typedef uint32_t zdwm_output_id_t;
 typedef uint32_t zdwm_layout_id_t;
 typedef uint32_t zdwm_window_id_t;
 typedef uint32_t zdwm_workspace_id_t;
diff --git a/src/config/runtime_config.c b/src/config/runtime_config.c
index 3aaff63..0b6c391 100644
--- a/src/config/runtime_config.c
+++ b/src/config/runtime_config.c
@@ -11,6 +11,7 @@
 #include "config/loader.h"
 #include "core/binding.h"
 #include "core/layout.h"
+#include "core/listeners.h"
 #include "core/rules.h"
 #include "core/runtime.h"
 #include "core/types.h"
@@ -28,6 +29,7 @@ struct zdwm_config_builder_t {
   size_t output_count;
   border_config_t border;
   binding_table_t *binding_table;
+  listeners_t listeners;
 };
 
 void runtime_config_cleanup(runtime_init_desc_t *desc) {
@@ -196,6 +198,87 @@ static void runtime_config_set_border_config(
   color_parse(focused, &builder->border.focused_color);
 }
 
+static void runtime_config_subscribe_current_output(
+  zdwm_config_builder_t *builder,
+  zdwm_current_output_id_listener *fn,
+  void *user_data
+) {
+  if (!builder || !fn) return;
+  listeners_add_output_listener(&builder->listeners, fn, user_data);
+}
+
+static void runtime_config_subscribe_initial_workspace_list(
+  zdwm_config_builder_t *builder,
+  zdwm_initial_workspace_list *fn,
+  void *user_data
+) {
+  if (!builder || !fn) return;
+  listeners_add_initial_workspace_listener(&builder->listeners, fn, user_data);
+}
+
+static void runtime_config_subscribe_workspace_active(
+  zdwm_config_builder_t *builder,
+  zdwm_workspace_active_updated *fn,
+  void *user_data
+) {
+  if (!builder || !fn) return;
+  listeners_add_active_workspace_listener(&builder->listeners, fn, user_data);
+}
+
+static void runtime_config_subscribe_layout(
+  zdwm_config_builder_t *builder,
+  zdwm_layout_notify *fn,
+  void *user_data
+) {
+  if (!builder || !fn) return;
+  listeners_add_layout_notify(&builder->listeners, fn, user_data);
+}
+
+static void runtime_config_subscribe_binding_mode(
+  zdwm_config_builder_t *builder,
+  zdwm_binding_mode_notify *fn,
+  void *user_data
+) {
+  if (!builder || !fn) return;
+  listeners_add_binding_mode_notify(&builder->listeners, fn, user_data);
+}
+
+static void runtime_config_subscribe_initial_window_list(
+  zdwm_config_builder_t *builder,
+  zdwm_initial_window_list *fn,
+  void *user_data
+) {
+  if (!builder || !fn) return;
+  listeners_add_initial_window_listener(&builder->listeners, fn, user_data);
+}
+
+static void runtime_config_subscribe_window_added(
+  zdwm_config_builder_t *builder,
+  zdwm_window_added *fn,
+  void *user_data
+) {
+  if (!builder || !fn) return;
+  listeners_add_window_added_listener(&builder->listeners, fn, user_data);
+}
+
+static void runtime_config_subscribe_window_updated(
+  zdwm_config_builder_t *builder,
+  zdwm_window_updated *fn,
+  void *user_data
+) {
+  if (!builder || !fn) return;
+  listeners_add_window_updated_listener(&builder->listeners, fn, user_data);
+}
+
+static void runtime_config_subscribe_window_removed(
+  zdwm_config_builder_t *builder,
+  zdwm_window_removed *fn,
+  void *user_data
+) {
+  if (!builder || !fn) return;
+  listeners_add_window_removed_listener(&builder->listeners, fn, user_data);
+}
+
 static bool config_builder_finish(
   zdwm_config_builder_t *builder,
   runtime_init_desc_t *out
@@ -210,11 +293,13 @@ static bool config_builder_finish(
   out->binding_table          = builder->binding_table;
   out->workspaces             = builder->workspaces;
   out->workspace_count        = builder->workspace_count;
+  out->listeners              = builder->listeners;
   builder->binding_table      = nullptr;
   builder->workspaces         = nullptr;
   builder->workspace_count    = 0;
   builder->workspace_capacity = 0;
   builder->output_count       = 0;
+  p_clear(&builder->listeners, 1);
   return true;
 }
 
@@ -245,6 +330,18 @@ static bool runtime_config_build(
     .set_default_mode  = runtime_config_set_default_mode,
     .set_initial_mode  = runtime_config_set_initial_mode,
     .set_border_config = runtime_config_set_border_config,
+
+    .subscribe_current_output = runtime_config_subscribe_current_output,
+    .subscribe_initial_workspace_list =
+      runtime_config_subscribe_initial_workspace_list,
+    .subscribe_workspace_active = runtime_config_subscribe_workspace_active,
+    .subscribe_layout           = runtime_config_subscribe_layout,
+    .subscribe_binding_mode     = runtime_config_subscribe_binding_mode,
+    .subscribe_initial_window_list =
+      runtime_config_subscribe_initial_window_list,
+    .subscribe_window_added   = runtime_config_subscribe_window_added,
+    .subscribe_window_updated = runtime_config_subscribe_window_updated,
+    .subscribe_window_removed = runtime_config_subscribe_window_removed,
   };
   bool ok = setup(&api, &builder, outputs, output_count) &&
             config_builder_finish(&builder, out);
diff --git a/src/core/listeners.c b/src/core/listeners.c
new file mode 100644
index 0000000..472e412
--- /dev/null
+++ b/src/core/listeners.c
@@ -0,0 +1,83 @@
+#include "core/listeners.h"
+
+#include "base/array.h"
+
+#define ADD_LISTENER(FIELD)                                               \
+  auto list       = &listeners->FIELD;                                    \
+  auto item       = array_push(list->items, list->count, list->capacity); \
+  item->fn        = fn;                                                   \
+  item->user_data = user_data
+
+void listeners_add_output_listener(
+  listeners_t *listeners,
+  zdwm_current_output_id_listener fn,
+  void *user_data
+) {
+  ADD_LISTENER(output_listeners);
+}
+
+void listeners_add_initial_workspace_listener(
+  listeners_t *listeners,
+  zdwm_initial_workspace_list fn,
+  void *user_data
+) {
+  ADD_LISTENER(initial_workspace_listeners);
+}
+
+void listeners_add_active_workspace_listener(
+  listeners_t *listeners,
+  zdwm_workspace_active_updated fn,
+  void *user_data
+) {
+  ADD_LISTENER(active_workspace_listeners);
+}
+
+void listeners_add_layout_notify(
+  listeners_t *listeners,
+  zdwm_layout_notify fn,
+  void *user_data
+) {
+  ADD_LISTENER(layout_listeners);
+}
+
+void listeners_add_binding_mode_notify(
+  listeners_t *listeners,
+  zdwm_binding_mode_notify fn,
+  void *user_data
+) {
+  ADD_LISTENER(binding_mode_listeners);
+}
+
+void listeners_add_initial_window_listener(
+  listeners_t *listeners,
+  zdwm_initial_window_list fn,
+  void *user_data
+) {
+  ADD_LISTENER(initial_window_listeners);
+}
+
+void listeners_add_window_added_listener(
+  listeners_t *listeners,
+  zdwm_window_added fn,
+  void *user_data
+) {
+  ADD_LISTENER(window_added_listeners);
+}
+
+void listeners_add_window_updated_listener(
+  listeners_t *listeners,
+  zdwm_window_updated fn,
+  void *user_data
+) {
+  ADD_LISTENER(window_updated_listeners);
+}
+
+void listeners_add_window_removed_listener(
+  listeners_t *listeners,
+  zdwm_window_removed fn,
+  void *user_data
+) {
+  ADD_LISTENER(window_removed_listeners);
+}
+
+#undef ADD_LISTENER
diff --git a/src/core/listeners.h b/src/core/listeners.h
new file mode 100644
index 0000000..061c6d2
--- /dev/null
+++ b/src/core/listeners.h
@@ -0,0 +1,89 @@
+#pragma once
+
+#include <stddef.h>
+#include <zdwm/listeners.h>
+
+#define ITEM(NAME, FN_TYPE)               \
+  typedef struct NAME##_listener_item_t { \
+    FN_TYPE *fn;                          \
+    void *user_data;                      \
+  } NAME##_listener_item_t
+
+#define LISTENERS(NAME, FN_TYPE)      \
+  ITEM(NAME, FN_TYPE);                \
+  typedef struct NAME##_listeners_t { \
+    NAME##_listener_item_t *items;    \
+    size_t count;                     \
+    size_t capacity;                  \
+  } NAME##_listeners_t
+
+LISTENERS(output, zdwm_current_output_id_listener);
+LISTENERS(initial_workspace_list, zdwm_initial_workspace_list);
+LISTENERS(workspace_active, zdwm_workspace_active_updated);
+LISTENERS(layout, zdwm_layout_notify);
+LISTENERS(binding_mode, zdwm_binding_mode_notify);
+LISTENERS(initial_window_list, zdwm_initial_window_list);
+LISTENERS(window_added, zdwm_window_added);
+LISTENERS(window_updated, zdwm_window_updated);
+LISTENERS(window_removed, zdwm_window_removed);
+
+#undef ITEM
+#undef LISTENERS
+
+typedef struct zdwm_listeners_t {
+  output_listeners_t output_listeners;
+  initial_workspace_list_listeners_t initial_workspace_listeners;
+  workspace_active_listeners_t active_workspace_listeners;
+  layout_listeners_t layout_listeners;
+  binding_mode_listeners_t binding_mode_listeners;
+  initial_window_list_listeners_t initial_window_listeners;
+  window_added_listeners_t window_added_listeners;
+  window_updated_listeners_t window_updated_listeners;
+  window_removed_listeners_t window_removed_listeners;
+} listeners_t;
+
+void listeners_add_output_listener(
+  listeners_t *listeners,
+  zdwm_current_output_id_listener fn,
+  void *user_data
+);
+void listeners_add_initial_workspace_listener(
+  listeners_t *listeners,
+  zdwm_initial_workspace_list fn,
+  void *user_data
+);
+void listeners_add_active_workspace_listener(
+  listeners_t *listeners,
+  zdwm_workspace_active_updated fn,
+  void *user_data
+);
+void listeners_add_layout_notify(
+  listeners_t *listeners,
+  zdwm_layout_notify fn,
+  void *user_data
+);
+void listeners_add_binding_mode_notify(
+  listeners_t *listeners,
+  zdwm_binding_mode_notify fn,
+  void *user_data
+);
+void listeners_add_initial_window_listener(
+  listeners_t *listeners,
+  zdwm_initial_window_list fn,
+  void *user_data
+);
+void listeners_add_window_added_listener(
+  listeners_t *listeners,
+  zdwm_window_added fn,
+  void *user_data
+);
+void listeners_add_window_updated_listener(
+  listeners_t *listeners,
+  zdwm_window_updated fn,
+  void *user_data
+);
+void listeners_add_window_removed_listener(
+  listeners_t *listeners,
+  zdwm_window_removed fn,
+  void *user_data
+);
diff --git a/src/core/runtime.c b/src/core/runtime.c
index c8944b7..f2f7aac 100644
--- a/src/core/runtime.c
+++ b/src/core/runtime.c
@@ -62,9 +62,11 @@ bool runtime_init(runtime_t *runtime, runtime_init_desc_t *desc) {
   runtime->border               = desc->border;
   runtime->config_module_handle = desc->config_module_handle;
   runtime->binding_table        = desc->binding_table;
+  runtime->listeners            = desc->listeners;
   desc->backend                 = nullptr;
   desc->config_module_handle    = nullptr;
   desc->binding_table           = nullptr;
+  p_clear(&desc->listeners, 1);
 
   state_init(
     &runtime->state,
diff --git a/src/core/runtime.h b/src/core/runtime.h
index 42a0037..b923685 100644
--- a/src/core/runtime.h
+++ b/src/core/runtime.h
@@ -7,6 +7,7 @@
 #include "core/binding.h"
 #include "core/command_buffer.h"
 #include "core/layout.h"
+#include "core/listeners.h"
 #include "core/plan.h"
 #include "core/rules.h"
 #include "core/state.h"
@@ -24,6 +25,7 @@ typedef struct runtime_init_desc_t {
   size_t workspace_count;
   void *config_module_handle;
   binding_table_t *binding_table;
+  listeners_t listeners;
 } runtime_init_desc_t;
 
 typedef struct zdwm_runtime_t {
@@ -40,6 +42,7 @@ typedef struct zdwm_runtime_t {
   backend_t *backend;
   void *config_module_handle;
   binding_table_t *binding_table;
+  listeners_t listeners;
 } runtime_t;
 
 bool runtime_init(runtime_t *runtime, runtime_init_desc_t *desc);
diff --git a/src/core/types.h b/src/core/types.h
index b44b143..331de7b 100644
--- a/src/core/types.h
+++ b/src/core/types.h
@@ -10,7 +10,7 @@
 typedef zdwm_layout_id_t        layout_id_t;
 typedef zdwm_window_id_t        window_id_t;
 typedef zdwm_workspace_id_t     workspace_id_t;
-typedef uint32_t                output_id_t;
+typedef zdwm_output_id_t        output_id_t;
 
 typedef zdwm_rect_t             rect_t;
 typedef zdwm_output_info_t      output_info_t;