6 static lv_obj_t * menu;  variable
17     lv_obj_t * sub_page = lv_menu_page_create(menu, NULL);  in float_btn_event_cb()
26     lv_menu_set_load_page_event(menu, cont, sub_page);  in float_btn_event_cb()
34     menu = lv_menu_create(lv_scr_act());  in lv_example_menu_4()
35     lv_obj_set_size(menu, lv_disp_get_hor_res(NULL), lv_disp_get_ver_res(NULL));  in lv_example_menu_4()
36     lv_obj_center(menu);  in lv_example_menu_4()
42     lv_obj_t * sub_page = lv_menu_page_create(menu, NULL);  in lv_example_menu_4()
49     main_page = lv_menu_page_create(menu, NULL);  in lv_example_menu_4()
54     lv_menu_set_load_page_event(menu, cont, sub_page);  in lv_example_menu_4()
56     lv_menu_set_page(menu, main_page);  in lv_example_menu_4()
63     lv_obj_add_event_cb(float_btn, float_btn_event_cb, LV_EVENT_CLICKED, menu);  in lv_example_menu_4()