observer
- lv_observer.h
lv_observer_cb_tlv_subject_type_tlv_subject_init_int()lv_subject_set_int()lv_subject_get_int()lv_subject_get_previous_int()lv_subject_init_string()lv_subject_copy_string()lv_subject_get_string()lv_subject_get_previous_string()lv_subject_init_pointer()lv_subject_set_pointer()lv_subject_get_pointer()lv_subject_get_previous_pointer()lv_subject_init_color()lv_subject_set_color()lv_subject_get_color()lv_subject_get_previous_color()lv_subject_init_group()lv_subject_deinit()lv_subject_get_group_element()lv_subject_add_observer()lv_subject_add_observer_obj()lv_subject_add_observer_with_target()lv_observer_remove()lv_obj_remove_from_subject()lv_observer_get_target()lv_observer_get_target_obj()lv_observer_get_user_data()lv_subject_notify()lv_obj_bind_flag_if_eq()lv_obj_bind_flag_if_not_eq()lv_obj_bind_state_if_eq()lv_obj_bind_state_if_not_eq()lv_obj_bind_checked()lv_label_bind_text()lv_arc_bind_value()lv_slider_bind_value()lv_roller_bind_value()lv_dropdown_bind_value()lv_subject_value_tlv_subject_t