feat(obj): add lv_obj_get_event_user_data()

src/core/lv_event.c

@@ -239,6 +239,18 @@ bool lv_obj_remove_event_dsc(lv_obj_t * obj, struct _lv_event_dsc_t * event_dsc)
     return false;
 }
 
+void * lv_obj_get_event_user_data(struct _lv_obj_t * obj, lv_event_cb_t event_cb)
+{
+    LV_ASSERT_OBJ(obj, MY_CLASS);
+    if(obj->spec_attr == NULL) return false;
+
+    int32_t i = 0;
+    for(i = 0; i < obj->spec_attr->event_dsc_cnt; i++) {
+        if(event_cb == obj->spec_attr->event_dsc[i].cb) return obj->spec_attr->event_dsc[i].user_data;
+    }
+    return NULL;
+}
+
 lv_indev_t * lv_event_get_indev(lv_event_t * e)
 {
 

src/core/lv_event.h

@@ -245,6 +245,14 @@ bool lv_obj_remove_event_cb_with_user_data(struct _lv_obj_t * obj, lv_event_cb_t
  */
 bool lv_obj_remove_event_dsc(struct _lv_obj_t * obj, struct _lv_event_dsc_t * event_dsc);
 
+/**
+ * The the user data of an event obejct event callback. Always the first match with `event_cb` will be returned.
+ * @param obj               pointer to an object
+ * @param event_cb          the event function
+ * @return                  the user_data
+ */
+void * lv_obj_get_event_user_data(struct _lv_obj_t * obj, lv_event_cb_t event_cb);
+
 /**
  * Get the input device passed as parameter to indev related events.
  * @param e     pointer to an event