feat(obj_class) separate lv_obj_class_create_obj into lv_obj_class_create_obj and lv_obj_class_init_obj

It allows using the new object reference somewhere before initializing it. Usuful for the Micropython binding.

src/core/lv_obj.c

@@ -174,7 +174,10 @@ void lv_deinit(void)
 
 lv_obj_t * lv_obj_create(lv_obj_t * parent)
 {
-    return lv_obj_class_create_obj(&lv_obj_class, parent, NULL);
+    LV_LOG_INFO("begin")
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/core/lv_obj_class.c

@@ -40,7 +40,7 @@ static uint32_t get_instance_size(const lv_obj_class_t * class_p);
  *   GLOBAL FUNCTIONS
  **********************/
 
-lv_obj_t * lv_obj_class_create_obj(const lv_obj_class_t * class_p, lv_obj_t * parent, void * user_data)
+lv_obj_t * lv_obj_class_create_obj(const lv_obj_class_t * class_p, lv_obj_t * parent)
 {
     LV_TRACE_OBJ_CREATE("Creating object with %p class on %p parent", class_p, parent);
     uint32_t s = get_instance_size(class_p);
@@ -49,11 +49,6 @@ lv_obj_t * lv_obj_class_create_obj(const lv_obj_class_t * class_p, lv_obj_t * pa
     lv_memset_00(obj, s);
     obj->class_p = class_p;
     obj->parent = parent;
-#if LV_USE_USER_DATA
-    obj->user_data = user_data;
-#else
-    LV_UNUSED(user_data);
-#endif
 
     /*Create a screen*/
     if(parent == NULL) {
@@ -99,6 +94,11 @@ lv_obj_t * lv_obj_class_create_obj(const lv_obj_class_t * class_p, lv_obj_t * pa
         }
     }
 
+    return obj;
+}
+
+void lv_obj_class_init_obj(lv_obj_t * obj)
+{
     lv_obj_mark_layout_as_dirty(obj);
     lv_obj_enable_style_refresh(false);
 
@@ -116,6 +116,7 @@ lv_obj_t * lv_obj_class_create_obj(const lv_obj_class_t * class_p, lv_obj_t * pa
         lv_group_add_obj(def_group, obj);
     }
 
+    lv_obj_t * parent = lv_obj_get_parent(obj);
     if(parent) {
         /*Call the ancestor's event handler to the parent to notify it about the new child.
          *Also triggers layout update*/
@@ -124,8 +125,6 @@ lv_obj_t * lv_obj_class_create_obj(const lv_obj_class_t * class_p, lv_obj_t * pa
         /*Invalidate the area if not screen created*/
         lv_obj_invalidate(obj);
     }
-
-    return obj;
 }
 
 void _lv_obj_destructor(lv_obj_t * obj)

src/core/lv_obj_class.h

@@ -70,11 +70,11 @@ typedef struct _lv_obj_class_t {
  * Create an object form a class descriptor
  * @param class_p   pointer to a class
  * @param parent    pointer to an object where the new object should be created
- * @param user_data a custom user_data to set in `obj->user_data` in creation time. Requires `LV_USE_USER_DATA 1`
- *                  As some event fire during creation it's useful make user_data available for those events too.
  * @return          pointer to the created object
  */
-struct _lv_obj_t * lv_obj_class_create_obj(const struct _lv_obj_class_t * class_p, struct _lv_obj_t * parent, void * user_data);
+struct _lv_obj_t * lv_obj_class_create_obj(const struct _lv_obj_class_t * class_p, struct _lv_obj_t * parent);
+
+void lv_obj_class_init_obj(struct _lv_obj_t * obj);
 
 void _lv_obj_destructor(struct _lv_obj_t * obj);
 

src/extra/widgets/animimg/lv_animimg.c

@@ -57,10 +57,12 @@ const lv_obj_class_t lv_animimg_class = {
 lv_obj_t * lv_animimg_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_animimg_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(&lv_animimg_class, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
-void lv_animimg_set_src(lv_obj_t * obj,  lv_img_dsc_t ** dsc, uint8_t num)
+void lv_animimg_set_src(lv_obj_t * obj,  lv_img_dsc_t * dsc[], uint8_t num)
 {
     lv_animimg_t * animimg = (lv_animimg_t *)obj;
     animimg->dsc = dsc;

src/extra/widgets/calendar/lv_calendar.c

@@ -56,8 +56,9 @@ static const char * day_names_def[7] = LV_CALENDAR_DEFAULT_DAY_NAMES;
 
 lv_obj_t * lv_calendar_create(lv_obj_t * parent)
 {
-    lv_obj_t * obj = lv_obj_class_create_obj(&lv_calendar_class, parent, NULL);
-
+    LV_LOG_INFO("begin")
+    lv_obj_t * obj = lv_obj_class_create_obj(&lv_calendar_class, parent);
+    lv_obj_class_init_obj(obj);
     return obj;
 }
 

src/extra/widgets/chart/lv_chart.c

@@ -65,7 +65,9 @@ const lv_obj_class_t lv_chart_class = {
 lv_obj_t * lv_chart_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_chart_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 void lv_chart_set_type(lv_obj_t * obj, lv_chart_type_t type)

src/extra/widgets/colorwheel/lv_colorwheel.c

@@ -74,8 +74,12 @@ static bool create_knob_recolor;
  */
 lv_obj_t * lv_colorwheel_create(lv_obj_t * parent, bool knob_recolor)
 {
+    LV_LOG_INFO("begin")
     create_knob_recolor = knob_recolor;
-    return lv_obj_class_create_obj(&lv_colorwheel_class, parent, NULL);
+
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/extra/widgets/imgbtn/lv_imgbtn.c

@@ -55,7 +55,10 @@ const lv_obj_class_t lv_imgbtn_class = {
  */
 lv_obj_t * lv_imgbtn_create(lv_obj_t * parent)
 {
-   return lv_obj_class_create_obj(&lv_imgbtn_class, parent, NULL);
+    LV_LOG_INFO("begin")
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/extra/widgets/keyboard/lv_keyboard.c

@@ -121,7 +121,10 @@ static const lv_btnmatrix_ctrl_t * kb_ctrl[5] = {
  */
 lv_obj_t * lv_keyboard_create(lv_obj_t * parent)
 {
-    return lv_obj_class_create_obj(&lv_keyboard_class, parent, NULL);
+    LV_LOG_INFO("begin")
+    lv_obj_t * obj = lv_obj_class_create_obj(&lv_keyboard_class, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/extra/widgets/led/lv_led.c

@@ -59,7 +59,10 @@ const lv_obj_class_t lv_led_class  = {
  */
 lv_obj_t * lv_led_create(lv_obj_t * parent)
 {
-    return lv_obj_class_create_obj(&lv_led_class, parent, NULL);
+    LV_LOG_INFO("begin")
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/extra/widgets/list/lv_list.c

@@ -55,42 +55,45 @@ const lv_obj_class_t lv_list_text_class = {
 
 lv_obj_t * lv_list_create(lv_obj_t * parent)
 {
-    lv_obj_t * list = lv_obj_class_create_obj(&lv_list_class, parent, NULL);
-    lv_obj_set_flex_flow(list, LV_FLEX_FLOW_COLUMN);
-
-    return list;
+    LV_LOG_INFO("begin")
+    lv_obj_t * obj = lv_obj_class_create_obj(&lv_list_class, parent);
+    lv_obj_class_init_obj(obj);
+    lv_obj_set_flex_flow(obj, LV_FLEX_FLOW_COLUMN);
+    return obj;
 }
 
 lv_obj_t * lv_list_add_text(lv_obj_t * list, const char * txt)
 {
-    lv_obj_t * label = lv_obj_class_create_obj(&lv_list_text_class, list, NULL);
-    lv_label_set_text(label, txt);
-    lv_label_set_long_mode(label, LV_LABEL_LONG_SCROLL_CIRCULAR);
-    lv_obj_set_width(label, LV_PCT(100));
-    return label;
+    LV_LOG_INFO("begin")
+    lv_obj_t * obj = lv_obj_class_create_obj(&lv_list_text_class, list);
+    lv_obj_class_init_obj(obj);
+    lv_label_set_text(obj, txt);
+    lv_label_set_long_mode(obj, LV_LABEL_LONG_SCROLL_CIRCULAR);
+    lv_obj_set_width(obj, LV_PCT(100));
+    return obj;
 }
 
 lv_obj_t * lv_list_add_btn(lv_obj_t * list, const char * icon, const char * txt, lv_event_cb_t event_cb)
 {
-    lv_obj_t * btn = lv_obj_class_create_obj(&lv_list_btn_class, list, NULL);
-    lv_obj_set_size(btn, LV_PCT(100), LV_SIZE_CONTENT);
-    if(event_cb) {
-    	lv_obj_add_event_cb(btn, event_cb, LV_EVENT_ALL, NULL);
-    }
+    LV_LOG_INFO("begin")
+    lv_obj_t * obj = lv_obj_class_create_obj(&lv_list_btn_class, list);
+    lv_obj_class_init_obj(obj);
+    lv_obj_set_size(obj, LV_PCT(100), LV_SIZE_CONTENT);
+    if(event_cb) lv_obj_add_event_cb(obj, event_cb, LV_EVENT_ALL, NULL);
 
     if(icon) {
-        lv_obj_t * img = lv_img_create(btn);
+        lv_obj_t * img = lv_img_create(obj);
         lv_img_set_src(img, icon);
     }
 
     if(txt) {
-        lv_obj_t * label = lv_label_create(btn);
+        lv_obj_t * label = lv_label_create(obj);
         lv_label_set_text(label, txt);
         lv_label_set_long_mode(label, LV_LABEL_LONG_SCROLL_CIRCULAR);
         lv_obj_set_flex_grow(label, 1);
     }
 
-    return btn;
+    return obj;
 }
 
 const char * lv_list_get_btn_text(lv_obj_t * list, lv_obj_t * btn)

src/extra/widgets/meter/lv_meter.c

@@ -52,7 +52,9 @@ const lv_obj_class_t lv_meter_class = {
 lv_obj_t * lv_meter_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_meter_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/extra/widgets/msgbox/lv_msgbox.c

@@ -39,6 +39,7 @@ const lv_obj_class_t lv_msgbox_class = {.base_class = &lv_obj_class};
 
 lv_obj_t * lv_msgbox_create(lv_obj_t * parent, const char * title, const char * txt, const char * btn_txts[], bool add_close_btn)
 {
+    LV_LOG_INFO("begin")
     bool auto_parent = false;
     if(parent == NULL) {
         auto_parent = true;
@@ -49,7 +50,8 @@ lv_obj_t * lv_msgbox_create(lv_obj_t * parent, const char * title, const char *
         lv_obj_set_size(parent, LV_PCT(100), LV_PCT(100));
     }
 
-    lv_obj_t * mbox = lv_obj_class_create_obj(&lv_msgbox_class, parent, NULL);
+    lv_obj_t * mbox = lv_obj_class_create_obj(&lv_msgbox_class, parent);
+    lv_obj_class_init_obj(mbox);
     LV_ASSERT_MALLOC(mbox);
     if(mbox == NULL) return NULL;
 

src/extra/widgets/spinbox/lv_spinbox.c

@@ -46,7 +46,10 @@ const lv_obj_class_t lv_spinbox_class = {
 
 lv_obj_t * lv_spinbox_create(lv_obj_t * parent)
 {
-   return lv_obj_class_create_obj(&lv_spinbox_class, parent, NULL);
+    LV_LOG_INFO("begin")
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/extra/widgets/tabview/lv_tabview.c

@@ -49,9 +49,13 @@ static lv_coord_t tabsize_create;
 
 lv_obj_t * lv_tabview_create(lv_obj_t * parent, lv_dir_t tab_pos, lv_coord_t tab_size)
 {
+    LV_LOG_INFO("begin")
     tabpos_create = tab_pos;
     tabsize_create = tab_size;
-    return lv_obj_class_create_obj(&lv_tabview_class, parent, NULL);
+
+    lv_obj_t * obj = lv_obj_class_create_obj(&lv_tabview_class, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 lv_obj_t * lv_tabview_add_tab(lv_obj_t * obj, const char * name)

src/extra/widgets/tileview/lv_tileview.c

@@ -50,7 +50,10 @@ static uint32_t create_row_id;
 
 lv_obj_t * lv_tileview_create(lv_obj_t * parent)
 {
-   return lv_obj_class_create_obj(&lv_tileview_class, parent, NULL);
+    LV_LOG_INFO("begin")
+    lv_obj_t * obj = lv_obj_class_create_obj(&lv_tileview_class, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*======================
@@ -59,10 +62,14 @@ lv_obj_t * lv_tileview_create(lv_obj_t * parent)
 
 lv_obj_t * lv_tileview_add_tile(lv_obj_t * tv, uint8_t col_id, uint8_t row_id, lv_dir_t dir)
 {
+    LV_LOG_INFO("begin")
     create_dir = dir;
     create_col_id = col_id;
     create_row_id = row_id;
-    return lv_obj_class_create_obj(&lv_tileview_tile_class, tv, NULL);
+
+    lv_obj_t * obj = lv_obj_class_create_obj(&lv_tileview_tile_class, tv);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 void lv_obj_set_tile(lv_obj_t * tv, lv_obj_t * tile_obj, lv_anim_enable_t anim_en)

src/extra/widgets/win/lv_win.c

@@ -44,8 +44,12 @@ static lv_coord_t create_header_height;
 
 lv_obj_t * lv_win_create(lv_obj_t * parent, lv_coord_t header_height)
 {
+    LV_LOG_INFO("begin")
     create_header_height = header_height;
-    return lv_obj_class_create_obj(&lv_win_class, parent, NULL);
+
+    lv_obj_t * obj = lv_obj_class_create_obj(&lv_win_class, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 lv_obj_t * lv_win_add_title(lv_obj_t * win, const char * txt)

src/widgets/lv_arc.c

@@ -65,7 +65,9 @@ const lv_obj_class_t lv_arc_class  = {
 lv_obj_t * lv_arc_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_arc_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*======================

src/widgets/lv_bar.c

@@ -78,7 +78,9 @@ const lv_obj_class_t lv_bar_class = {
 lv_obj_t * lv_bar_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_bar_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/widgets/lv_btn.c

@@ -15,6 +15,7 @@
 /*********************
  *      DEFINES
  *********************/
+#define MY_CLASS &lv_btn_class
 
 /**********************
  *      TYPEDEFS
@@ -48,7 +49,9 @@ const lv_obj_class_t lv_btn_class  = {
 lv_obj_t * lv_btn_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-     return lv_obj_class_create_obj(&lv_btn_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /**********************

src/widgets/lv_btnmatrix.c

@@ -79,7 +79,9 @@ const lv_obj_class_t lv_btnmatrix_class = {
 lv_obj_t * lv_btnmatrix_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_btnmatrix_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/widgets/lv_canvas.c

@@ -67,7 +67,9 @@ const lv_obj_class_t lv_canvas_class = {
 lv_obj_t * lv_canvas_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_canvas_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/widgets/lv_checkbox.c

@@ -56,7 +56,9 @@ const lv_obj_class_t lv_checkbox_class = {
 lv_obj_t * lv_checkbox_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_checkbox_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/widgets/lv_dropdown.c

@@ -90,7 +90,9 @@ const lv_obj_class_t lv_dropdownlist_class = {
 lv_obj_t * lv_dropdown_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_dropdown_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(&lv_dropdown_class, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================
@@ -517,7 +519,10 @@ void lv_dropdown_close(lv_obj_t * obj)
 
 static lv_obj_t * lv_dropdown_list_create(lv_obj_t * parent)
 {
-    return lv_obj_class_create_obj(&lv_dropdownlist_class, parent, NULL);
+    LV_LOG_INFO("begin")
+    lv_obj_t * obj = lv_obj_class_create_obj(&lv_dropdownlist_class, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 static void lv_dropdown_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)

src/widgets/lv_img.c

@@ -57,7 +57,9 @@ const lv_obj_class_t lv_img_class = {
 lv_obj_t * lv_img_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_img_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/widgets/lv_label.c

@@ -73,7 +73,9 @@ const lv_obj_class_t lv_label_class = {
 lv_obj_t * lv_label_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_label_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/widgets/lv_line.c

@@ -54,7 +54,9 @@ const lv_obj_class_t lv_line_class = {
 lv_obj_t * lv_line_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_line_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/widgets/lv_roller.c

@@ -77,7 +77,9 @@ const lv_obj_class_t lv_roller_label_class  = {
 lv_obj_t * lv_roller_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_roller_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================
@@ -297,7 +299,9 @@ static void lv_roller_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj
     lv_obj_clear_flag(obj, LV_OBJ_FLAG_SCROLLABLE);
     lv_obj_clear_flag(obj, LV_OBJ_FLAG_SCROLL_CHAIN);
 
-    lv_obj_class_create_obj(&lv_roller_label_class, obj, NULL);
+    LV_LOG_INFO("begin")
+    lv_obj_t * label = lv_obj_class_create_obj(&lv_roller_label_class, obj);
+    lv_obj_class_init_obj(label);
     lv_roller_set_options(obj, "Option 1\nOption 2\nOption 3\nOption 4\nOption 5", LV_ROLLER_MODE_NORMAL);
 
     LV_LOG_TRACE("finshed");

src/widgets/lv_slider.c

@@ -59,7 +59,9 @@ const lv_obj_class_t lv_slider_class = {
 lv_obj_t * lv_slider_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_slider_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 bool lv_slider_is_dragged(const lv_obj_t * obj)

src/widgets/lv_switch.c

@@ -61,7 +61,9 @@ const lv_obj_class_t lv_switch_class = {
 lv_obj_t * lv_switch_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_switch_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /**********************

src/widgets/lv_table.c

@@ -64,7 +64,9 @@ const lv_obj_class_t lv_table_class  = {
 lv_obj_t * lv_table_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-    return lv_obj_class_create_obj(&lv_table_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*=====================

src/widgets/lv_textarea.c

@@ -84,7 +84,9 @@ static const char * ta_insert_replace;
 lv_obj_t * lv_textarea_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin")
-  return lv_obj_class_create_obj(&lv_textarea_class, parent, NULL);
+    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
+    lv_obj_class_init_obj(obj);
+    return obj;
 }
 
 /*======================