添加鼠标事件拦截

src/include/types.h

@@ -183,3 +183,20 @@ typedef struct icons_t {
   icon_res_t cpu;
   icon_res_t clock;
 } icons_t;
+
+typedef enum click_area_t {
+  click_tag,
+  click_layout_symbol,
+  click_window_title,
+  click_status,
+  click_client_window,
+  click_root_win,
+} click_area_t;
+
+typedef struct button_t {
+  click_area_t click_area;
+  uint16_t modifiers;
+  uint8_t button;
+  void (*func)(const user_action_arg_t *);
+  const user_action_arg_t arg;
+} button_t;