lv_tabview: add lv_res_t return value to prevent tab laoding on LV_RES_INV

Author: kisvegabor

lv_objx/lv_tabview.c

@@ -275,8 +275,10 @@ void lv_tabview_set_tab_act(lv_obj_t * tabview, uint16_t id, bool anim_en)
 
     lv_style_t * style = lv_obj_get_style(ext->content);
 
+    lv_res_t res = LV_RES_OK;
     if(id >= ext->tab_cnt) id = ext->tab_cnt - 1;
-    if(ext->tab_load_action && id != ext->tab_cur) ext->tab_load_action(tabview, id);
+    if(ext->tab_load_action && id != ext->tab_cur) res = ext->tab_load_action(tabview, id);
+    if(res != LV_RES_OK) return;        /*Prevent the tab loading*/
 
     ext->tab_cur = id;
 

lv_objx/lv_tabview.h

@@ -42,8 +42,9 @@ extern "C" {
  *      TYPEDEFS
  **********************/
 
-/* parametes: pointer to a tabview object, tab_id*/
-typedef void (*lv_tabview_action_t)(lv_obj_t *, uint16_t);
+/* parametes: pointer to a tabview object, tab_id
+ * return: LV_RES_INV: to prevent the loading of the tab;  LV_RES_OK: if everything is fine*/
+typedef lv_res_t (*lv_tabview_action_t)(lv_obj_t *, uint16_t);
 
 
 enum {