diff --git a/src/core/lv_obj.c b/src/core/lv_obj.c
index c81cfd684..4a51bae05 100644
--- a/src/core/lv_obj.c
+++ b/src/core/lv_obj.c
@@ -64,8 +64,8 @@ typedef struct _lv_event_dsc_t{
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_obj_constructor(lv_obj_t * obj);
-static void lv_obj_destructor(lv_obj_t * obj);
+static void lv_obj_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_obj_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_obj_draw(lv_obj_t * obj, lv_event_t e);
 static void lv_obj_event_cb(lv_obj_t * obj, lv_event_t e);
 static void draw_scrollbar(lv_obj_t * obj, const lv_area_t * clip_area);
@@ -575,8 +575,9 @@ bool lv_obj_is_valid(const lv_obj_t * obj)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_obj_constructor(lv_obj_t * obj)
+static void lv_obj_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_obj_t * parent = obj->parent;
@@ -604,9 +605,10 @@ static void lv_obj_constructor(lv_obj_t * obj)
     LV_TRACE_OBJ_CREATE("finished");
 }
 
-static void lv_obj_destructor(lv_obj_t * p)
+static void lv_obj_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
-    lv_obj_t * obj = p;
+    LV_UNUSED(class_p);
+
     if(obj->spec_attr) {
         if(obj->spec_attr->children) {
             lv_mem_free(obj->spec_attr->children);
diff --git a/src/core/lv_obj_class.c b/src/core/lv_obj_class.c
index 1965762e5..6824e4397 100644
--- a/src/core/lv_obj_class.c
+++ b/src/core/lv_obj_class.c
@@ -115,16 +115,16 @@ lv_obj_t * lv_obj_create_from_class(const lv_obj_class_t * class_p, lv_obj_t * p
     return obj;
 }
 
-void _lv_obj_destruct(lv_obj_t * obj)
+void _lv_obj_destructor(lv_obj_t * obj)
 {
-    if(obj->class_p->destructor_cb) obj->class_p->destructor_cb(obj);
+    if(obj->class_p->destructor_cb) obj->class_p->destructor_cb(obj->class_p, obj);
 
     if(obj->class_p->base_class) {
         /*Don't let the descendant methods run during destructing the ancestor type*/
         obj->class_p = obj->class_p->base_class;
 
         /*Call the base class's destructor too*/
-        _lv_obj_destruct(obj);
+        _lv_obj_destructor(obj);
     }
 }
 
@@ -170,7 +170,7 @@ static void lv_obj_construct(lv_obj_t * obj)
     /*Restore the original class*/
     obj->class_p = original_class_p;
 
-    if(obj->class_p->constructor_cb) obj->class_p->constructor_cb(obj);
+    if(obj->class_p->constructor_cb) obj->class_p->constructor_cb(obj->class_p, obj);
 }
 
 static uint32_t get_instance_size(const lv_obj_class_t * class_p)
diff --git a/src/core/lv_obj_class.h b/src/core/lv_obj_class.h
index e5487d5db..9c232b160 100644
--- a/src/core/lv_obj_class.h
+++ b/src/core/lv_obj_class.h
@@ -45,8 +45,8 @@ typedef enum {
  */
 typedef struct _lv_obj_class_t {
     const struct _lv_obj_class_t * base_class;
-    void (*constructor_cb)(struct _lv_obj_t * obj);
-    void (*destructor_cb)(struct _lv_obj_t * obj);
+    void (*constructor_cb)(const struct _lv_obj_class_t * class_p, struct _lv_obj_t * obj);
+    void (*destructor_cb)(const struct _lv_obj_class_t * class_p, struct _lv_obj_t * obj);
 #if LV_USE_USER_DATA
     void * user_data;
 #endif
@@ -70,7 +70,7 @@ typedef struct _lv_obj_class_t {
  */
 struct _lv_obj_t * lv_obj_create_from_class(const struct _lv_obj_class_t * class_p, struct _lv_obj_t * parent);
 
-void _lv_obj_destruct(struct _lv_obj_t * obj);
+void _lv_obj_destructor(struct _lv_obj_t * obj);
 
 bool lv_obj_is_editable(struct _lv_obj_t * obj);
 
diff --git a/src/core/lv_obj_tree.c b/src/core/lv_obj_tree.c
index f96f60a03..44a328ed9 100644
--- a/src/core/lv_obj_tree.c
+++ b/src/core/lv_obj_tree.c
@@ -373,7 +373,7 @@ static void obj_del_core(lv_obj_t * obj)
     }
 
     /*All children deleted. Now clean up the object specific data*/
-    _lv_obj_destruct(obj);
+    _lv_obj_destructor(obj);
 
     /*Remove the screen for the screen list*/
     if(obj->parent == NULL) {
diff --git a/src/extra/widgets/calendar/lv_calendar.c b/src/extra/widgets/calendar/lv_calendar.c
index da10abca9..32f27e5b1 100644
--- a/src/extra/widgets/calendar/lv_calendar.c
+++ b/src/extra/widgets/calendar/lv_calendar.c
@@ -23,7 +23,7 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void my_constructor(lv_obj_t * obj);
+static void my_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void draw_event_cb(lv_obj_t * obj, lv_event_t e);
 
 static uint8_t get_day_of_week(uint32_t year, uint32_t month, uint32_t day);
@@ -206,8 +206,9 @@ bool lv_calendar_get_pressed_date(const lv_obj_t * obj, lv_calendar_date_t * dat
  *  STATIC FUNCTIONS
  **********************/
 
-static void my_constructor(lv_obj_t * obj)
+static void my_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_calendar_t * calendar = (lv_calendar_t *)obj;
 
     /*Initialize the allocated 'ext'*/
diff --git a/src/extra/widgets/colorwheel/lv_colorwheel.c b/src/extra/widgets/colorwheel/lv_colorwheel.c
index ab75c354a..048150d9d 100644
--- a/src/extra/widgets/colorwheel/lv_colorwheel.c
+++ b/src/extra/widgets/colorwheel/lv_colorwheel.c
@@ -32,7 +32,7 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_colorwheel_constructor(lv_obj_t * obj);
+static void lv_colorwheel_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_colorwheel_event(lv_obj_t * obj, lv_event_t e);
 
 static void draw_disc_grad(lv_obj_t * obj);
@@ -208,8 +208,9 @@ bool lv_colorwheel_get_color_mode_fixed(lv_obj_t * obj)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_colorwheel_constructor(lv_obj_t * obj)
+static void lv_colorwheel_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_colorwheel_t * colorwheel = (lv_colorwheel_t *)obj;
     colorwheel->hsv.h = 0;
     colorwheel->hsv.s = 100;
diff --git a/src/extra/widgets/imgbtn/lv_imgbtn.c b/src/extra/widgets/imgbtn/lv_imgbtn.c
index e1af3d7c9..51da085de 100644
--- a/src/extra/widgets/imgbtn/lv_imgbtn.c
+++ b/src/extra/widgets/imgbtn/lv_imgbtn.c
@@ -23,7 +23,7 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_imgbtn_constructor(lv_obj_t * obj);
+static void lv_imgbtn_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void draw_main(lv_obj_t * obj);
 static void lv_imgbtn_event(lv_obj_t * imgbtn, lv_event_t e);
 static void refr_img(lv_obj_t * imgbtn);
@@ -147,8 +147,9 @@ const void * lv_imgbtn_get_src_right(lv_obj_t * obj, lv_imgbtn_state_t state)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_imgbtn_constructor(lv_obj_t * obj)
+static void lv_imgbtn_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
    lv_imgbtn_t * imgbtn = (lv_imgbtn_t *)obj;
    /*Initialize the allocated 'ext'*/
    lv_memset_00((void *)imgbtn->img_src_mid, sizeof(imgbtn->img_src_mid));
diff --git a/src/extra/widgets/keyboard/lv_keyboard.c b/src/extra/widgets/keyboard/lv_keyboard.c
index c0189109f..44731d2b5 100644
--- a/src/extra/widgets/keyboard/lv_keyboard.c
+++ b/src/extra/widgets/keyboard/lv_keyboard.c
@@ -23,7 +23,7 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_keyboard_constructor(lv_obj_t * obj);
+static void lv_keyboard_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 
 static void lv_keyboard_update_map(lv_obj_t * obj);
 
@@ -320,8 +320,9 @@ void lv_keyboard_def_event_cb(lv_obj_t * obj, lv_event_t event)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_keyboard_constructor(lv_obj_t * obj)
+static void lv_keyboard_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_obj_clear_flag(obj, LV_OBJ_FLAG_CLICK_FOCUSABLE);
 
     lv_keyboard_t * keyboard = (lv_keyboard_t *)obj;
diff --git a/src/extra/widgets/led/lv_led.c b/src/extra/widgets/led/lv_led.c
index 7cea3a7a5..e50ae975d 100644
--- a/src/extra/widgets/led/lv_led.c
+++ b/src/extra/widgets/led/lv_led.c
@@ -29,7 +29,7 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_led_constructor(lv_obj_t * obj);
+static void lv_led_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_led_event(lv_obj_t * obj, lv_event_t e);
 
 /**********************
@@ -147,8 +147,9 @@ uint8_t lv_led_get_brightness(const lv_obj_t * obj)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_led_constructor(lv_obj_t * obj)
+static void lv_led_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_led_t * led = (lv_led_t *)obj;
     led->color = lv_theme_get_color_primary(obj);
     led->bright = LV_LED_BRIGHT_MAX;
diff --git a/src/extra/widgets/spinbox/lv_spinbox.c b/src/extra/widgets/spinbox/lv_spinbox.c
index 768084ae3..db50fbde6 100644
--- a/src/extra/widgets/spinbox/lv_spinbox.c
+++ b/src/extra/widgets/spinbox/lv_spinbox.c
@@ -22,7 +22,7 @@
  *  STATIC PROTOTYPES
  **********************/
 
-static void lv_spinbox_constructor(lv_obj_t * obj);
+static void lv_spinbox_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_spinbox_event(lv_obj_t * obj, lv_event_t e);
 static void lv_spinbox_updatevalue(lv_obj_t * obj);
 
@@ -269,8 +269,9 @@ void lv_spinbox_decrement(lv_obj_t * obj)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_spinbox_constructor(lv_obj_t * obj)
+static void lv_spinbox_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_LOG_TRACE("begin");
 
     lv_spinbox_t * spinbox = (lv_spinbox_t *)obj;
diff --git a/src/extra/widgets/tabview/lv_tabview.c b/src/extra/widgets/tabview/lv_tabview.c
index cb1b0ec68..a51383ac5 100644
--- a/src/extra/widgets/tabview/lv_tabview.c
+++ b/src/extra/widgets/tabview/lv_tabview.c
@@ -20,8 +20,8 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_tabview_constructor(lv_obj_t * obj);
-static void lv_tabview_destructor(lv_obj_t * obj);
+static void lv_tabview_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_tabview_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void btns_event_cb(lv_obj_t * btns, lv_event_t e);
 static void cont_event_cb(lv_obj_t * cont, lv_event_t e);
 
@@ -146,8 +146,9 @@ lv_obj_t * lv_tabview_get_tab_btns(lv_obj_t * tv)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_tabview_constructor(lv_obj_t * obj)
+static void lv_tabview_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_tabview_t * tabview = (lv_tabview_t *)obj;
 
     tabview->tab_pos = tabpos_create;
@@ -209,8 +210,9 @@ static void lv_tabview_constructor(lv_obj_t * obj)
     lv_obj_clear_flag(cont, LV_OBJ_FLAG_SCROLL_ON_FOCUS);
 }
 
-static void lv_tabview_destructor(lv_obj_t * obj)
+static void lv_tabview_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_tabview_t * tabview = (lv_tabview_t *)obj;
 
     uint32_t i;
diff --git a/src/extra/widgets/tileview/lv_tileview.c b/src/extra/widgets/tileview/lv_tileview.c
index df7c67854..4edb5a1ac 100644
--- a/src/extra/widgets/tileview/lv_tileview.c
+++ b/src/extra/widgets/tileview/lv_tileview.c
@@ -20,8 +20,8 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_tileview_constructor(lv_obj_t * obj);
-static void lv_tileview_tile_constructor(lv_obj_t * obj);
+static void lv_tileview_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_tileview_tile_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void tileview_event_cb(lv_obj_t * tv, lv_event_t e);
 
 /**********************
@@ -101,8 +101,9 @@ void lv_obj_set_tile_id(lv_obj_t * tv, uint32_t col_id, uint32_t row_id, lv_anim
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_tileview_constructor(lv_obj_t * obj)
+static void lv_tileview_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_obj_set_size(obj, LV_SIZE_PCT(100), LV_SIZE_PCT(100));
     lv_obj_add_event_cb(obj, tileview_event_cb, NULL);
     lv_obj_add_flag(obj, LV_OBJ_FLAG_SCROLL_ONE);
@@ -111,8 +112,9 @@ static void lv_tileview_constructor(lv_obj_t * obj)
 
 }
 
-static void lv_tileview_tile_constructor(lv_obj_t * obj)
+static void lv_tileview_tile_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_obj_t * parent = lv_obj_get_parent(obj);
     lv_obj_set_size(obj, LV_SIZE_PCT(100), LV_SIZE_PCT(100));
     lv_obj_set_pos(obj, create_col_id * lv_obj_get_width_fit(parent),  create_row_id * lv_obj_get_height_fit(parent));
diff --git a/src/extra/widgets/win/lv_win.c b/src/extra/widgets/win/lv_win.c
index ca9ebe966..74b622b0a 100644
--- a/src/extra/widgets/win/lv_win.c
+++ b/src/extra/widgets/win/lv_win.c
@@ -21,7 +21,7 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_win_constructor(lv_obj_t * obj);
+static void lv_win_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 
 /**********************
  *  STATIC VARIABLES
@@ -86,8 +86,9 @@ lv_obj_t * lv_win_get_content(lv_obj_t * win)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_win_constructor(lv_obj_t * obj)
+static void lv_win_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_obj_t * parent = lv_obj_get_parent(obj);
     lv_obj_set_size(obj, lv_obj_get_width(parent), lv_obj_get_height(parent));
     lv_obj_set_flex_flow(obj, LV_FLEX_FLOW_COLUMN);
diff --git a/src/misc/lv_tlsf.c b/src/misc/lv_tlsf.c
index 1c605edd7..0ae03c9e0 100644
--- a/src/misc/lv_tlsf.c
+++ b/src/misc/lv_tlsf.c
@@ -818,7 +818,7 @@ static void* block_prepare_used(control_t* control, block_header_t* block, size_
 }
 
 /* Clear structure and point all empty lists at the null block. */
-static void control_construct(control_t* control)
+static void control_constructor(control_t* control)
 {
 	int i, j;
 
@@ -1113,7 +1113,7 @@ tlsf_t tlsf_create(void* mem)
 		return 0;
 	}
 
-	control_construct(tlsf_cast(control_t*, mem));
+	control_constructor(tlsf_cast(control_t*, mem));
 
 	return tlsf_cast(tlsf_t, mem);
 }
diff --git a/src/widgets/lv_arc.c b/src/widgets/lv_arc.c
index c83c3fac3..80db692d0 100644
--- a/src/widgets/lv_arc.c
+++ b/src/widgets/lv_arc.c
@@ -30,7 +30,7 @@
  *  STATIC PROTOTYPES
  **********************/
 
-static void lv_arc_constructor(lv_obj_t * obj);
+static void lv_arc_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_arc_draw(lv_obj_t * obj);
 static void lv_arc_event(lv_obj_t * obj, lv_event_t e);
 static void inv_arc_area(lv_obj_t * arc, uint16_t start_angle, uint16_t end_angle, lv_part_t part);
@@ -479,8 +479,9 @@ lv_arc_type_t lv_arc_get_type(const lv_obj_t * obj)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_arc_constructor(lv_obj_t * obj)
+static void lv_arc_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_arc_t * arc = (lv_arc_t *)obj;
diff --git a/src/widgets/lv_bar.c b/src/widgets/lv_bar.c
index fee672c27..6de4d2bcd 100644
--- a/src/widgets/lv_bar.c
+++ b/src/widgets/lv_bar.c
@@ -45,8 +45,8 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_bar_constructor(lv_obj_t * obj);
-static void lv_bar_destructor(lv_obj_t * obj);
+static void lv_bar_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_bar_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_bar_event(lv_obj_t * bar, lv_event_t e);
 static void draw_indic(lv_obj_t * bar);
 static void lv_bar_set_value_with_anim(lv_obj_t * obj, int16_t new_value, int16_t * value_ptr,
@@ -200,8 +200,9 @@ lv_bar_mode_t lv_bar_get_mode(lv_obj_t * obj)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_bar_constructor(lv_obj_t * obj)
+static void lv_bar_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_bar_t * bar = (lv_bar_t *)obj;
@@ -221,8 +222,9 @@ static void lv_bar_constructor(lv_obj_t * obj)
     LV_TRACE_OBJ_CREATE("finished");
 }
 
-static void lv_bar_destructor(lv_obj_t * obj)
+static void lv_bar_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_bar_t * bar = (lv_bar_t *)obj;
 
     lv_anim_del(&bar->cur_value_anim, NULL);
diff --git a/src/widgets/lv_btn.c b/src/widgets/lv_btn.c
index c208a4660..668b04567 100644
--- a/src/widgets/lv_btn.c
+++ b/src/widgets/lv_btn.c
@@ -23,7 +23,7 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_btn_constructor(lv_obj_t * obj);
+static void lv_btn_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 
 /**********************
  *  STATIC VARIABLES
@@ -55,8 +55,9 @@ lv_obj_t * lv_btn_create(lv_obj_t * parent)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_btn_constructor(lv_obj_t * obj)
+static void lv_btn_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_obj_clear_flag(obj, LV_OBJ_FLAG_SCROLLABLE);
diff --git a/src/widgets/lv_btnmatrix.c b/src/widgets/lv_btnmatrix.c
index 782cb9687..70d65a997 100644
--- a/src/widgets/lv_btnmatrix.c
+++ b/src/widgets/lv_btnmatrix.c
@@ -32,8 +32,8 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_btnmatrix_constructor(lv_obj_t * obj);
-static void lv_btnmatrix_destructor(lv_obj_t * obj);
+static void lv_btnmatrix_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_btnmatrix_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_btnmatrix_event(lv_obj_t * obj, lv_event_t e);
 static void draw_main(lv_obj_t * obj);
 
@@ -356,8 +356,10 @@ bool lv_btnmatrix_get_one_checked(const lv_obj_t * obj)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_btnmatrix_constructor(lv_obj_t * obj)
+static void lv_btnmatrix_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
+    LV_TRACE_OBJ_CREATE("begin");
     lv_btnmatrix_t * btnm = (lv_btnmatrix_t *)obj;
     btnm->btn_cnt        = 0;
     btnm->btn_id_sel     = LV_BTNMATRIX_BTN_NONE;
@@ -369,16 +371,19 @@ static void lv_btnmatrix_constructor(lv_obj_t * obj)
 
     lv_btnmatrix_set_map(obj, lv_btnmatrix_def_map);
 
-    LV_LOG_TRACE("finshed");
+    LV_TRACE_OBJ_CREATE("finshed");
 }
 
-static void lv_btnmatrix_destructor(lv_obj_t * obj)
+static void lv_btnmatrix_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_TRACE_OBJ_CREATE("begin");
+    LV_UNUSED(class_p);
     lv_btnmatrix_t * btnm = (lv_btnmatrix_t *)obj;
     lv_mem_free(btnm->button_areas);
     lv_mem_free(btnm->ctrl_bits);
     btnm->button_areas = NULL;
     btnm->ctrl_bits = NULL;
+    LV_TRACE_OBJ_CREATE("finshed");
 }
 
 static void lv_btnmatrix_event(lv_obj_t * obj, lv_event_t e)
diff --git a/src/widgets/lv_canvas.c b/src/widgets/lv_canvas.c
index 980d7d7fa..7066bae8f 100644
--- a/src/widgets/lv_canvas.c
+++ b/src/widgets/lv_canvas.c
@@ -27,7 +27,7 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_canvas_constructor(lv_obj_t * obj);
+static void lv_canvas_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void set_set_px_cb(lv_disp_drv_t * disp_drv, lv_img_cf_t cf);
 
 static void set_px_true_color_alpha(lv_disp_drv_t * disp_drv, uint8_t * buf, lv_coord_t buf_w, lv_coord_t x,
@@ -892,22 +892,23 @@ void lv_canvas_draw_arc(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_coord_
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_canvas_constructor(lv_obj_t * obj)
+static void lv_canvas_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
-   LV_TRACE_OBJ_CREATE("begin");
+    LV_UNUSED(class_p);
+    LV_TRACE_OBJ_CREATE("begin");
 
-   lv_canvas_t * canvas = (lv_canvas_t *)obj;
+    lv_canvas_t * canvas = (lv_canvas_t *)obj;
 
-   canvas->dsc.header.always_zero = 0;
-   canvas->dsc.header.cf          = LV_IMG_CF_TRUE_COLOR;
-   canvas->dsc.header.h           = 0;
-   canvas->dsc.header.w           = 0;
-   canvas->dsc.data_size          = 0;
-   canvas->dsc.data               = NULL;
+    canvas->dsc.header.always_zero = 0;
+    canvas->dsc.header.cf          = LV_IMG_CF_TRUE_COLOR;
+    canvas->dsc.header.h           = 0;
+    canvas->dsc.header.w           = 0;
+    canvas->dsc.data_size          = 0;
+    canvas->dsc.data               = NULL;
 
-   lv_img_set_src(obj, &canvas->dsc);
+    lv_img_set_src(obj, &canvas->dsc);
 
-   LV_TRACE_OBJ_CREATE("finished");
+    LV_TRACE_OBJ_CREATE("finished");
 }
 
 static void set_set_px_cb(lv_disp_drv_t * disp_drv, lv_img_cf_t cf)
diff --git a/src/widgets/lv_chart.c b/src/widgets/lv_chart.c
index e44bf60af..df56d87f8 100644
--- a/src/widgets/lv_chart.c
+++ b/src/widgets/lv_chart.c
@@ -36,8 +36,8 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_chart_constructor(lv_obj_t * obj);
-static void lv_chart_destructor(lv_obj_t * obj);
+static void lv_chart_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_chart_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_chart_event(lv_obj_t * obj, lv_event_t e);
 
 static void draw_div_lines(lv_obj_t * obj , const lv_area_t * mask);
@@ -564,8 +564,9 @@ uint32_t lv_chart_get_pressed_point(const lv_obj_t * obj)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_chart_constructor(lv_obj_t * obj)
+static void lv_chart_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_chart_t * chart = (lv_chart_t *)obj;
@@ -590,8 +591,11 @@ static void lv_chart_constructor(lv_obj_t * obj)
     LV_TRACE_OBJ_CREATE("finished");
 }
 
-static void lv_chart_destructor(lv_obj_t * obj)
+static void lv_chart_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
+    LV_TRACE_OBJ_CREATE("begin");
+
     lv_chart_t * chart = (lv_chart_t *)obj;
     lv_chart_series_t * ser;
     while(chart->series_ll.head) {
@@ -603,6 +607,8 @@ static void lv_chart_destructor(lv_obj_t * obj)
         lv_mem_free(ser);
     }
     _lv_ll_clear(&chart->series_ll);
+
+    LV_TRACE_OBJ_CREATE("finished");
 }
 
 static void lv_chart_event(lv_obj_t * obj, lv_event_t e)
diff --git a/src/widgets/lv_checkbox.c b/src/widgets/lv_checkbox.c
index a8289436d..dc433e167 100644
--- a/src/widgets/lv_checkbox.c
+++ b/src/widgets/lv_checkbox.c
@@ -26,8 +26,8 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_checkbox_constructor(lv_obj_t * obj);
-static void lv_checkbox_destructor(lv_obj_t * obj);
+static void lv_checkbox_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_checkbox_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_checkbox_event(lv_obj_t * obj, lv_event_t e);
 static void lv_checkbox_draw(lv_obj_t * obj);
 
@@ -111,8 +111,9 @@ const char * lv_checkbox_get_text(const lv_obj_t * obj)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_checkbox_constructor(lv_obj_t * obj)
+static void lv_checkbox_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_checkbox_t * cb = (lv_checkbox_t *)obj;
@@ -126,13 +127,17 @@ static void lv_checkbox_constructor(lv_obj_t * obj)
     LV_TRACE_OBJ_CREATE("finished");
 }
 
-static void lv_checkbox_destructor(lv_obj_t * obj)
+static void lv_checkbox_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
+    LV_TRACE_OBJ_CREATE("begin");
+
     lv_checkbox_t * cb = (lv_checkbox_t *)obj;
     if(!cb->static_txt) {
         lv_mem_free(cb->txt);
         cb->txt = NULL;
     }
+    LV_TRACE_OBJ_CREATE("finished");
 }
 
 static void lv_checkbox_event(lv_obj_t * obj, lv_event_t e)
diff --git a/src/widgets/lv_dropdown.c b/src/widgets/lv_dropdown.c
index 87a7ee011..423b69576 100644
--- a/src/widgets/lv_dropdown.c
+++ b/src/widgets/lv_dropdown.c
@@ -37,13 +37,13 @@
  *  STATIC PROTOTYPES
  **********************/
 static lv_obj_t * lv_dropdown_list_create(lv_obj_t * parent);
-static void lv_dropdown_constructor(lv_obj_t * obj);
-static void lv_dropdown_destructor(lv_obj_t * obj);
+static void lv_dropdown_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_dropdown_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_dropdown_event(lv_obj_t * obj, lv_event_t e);
 static void draw_main(lv_obj_t * obj);
 
-static void lv_dropdownlist_constructor(lv_obj_t * obj);
-static void lv_dropdownlist_destructor(lv_obj_t * list_obj);
+static void lv_dropdownlist_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_dropdownlist_destructor(const lv_obj_class_t * class_p, lv_obj_t * list_obj);
 static void lv_dropdown_list_event(lv_obj_t * list, lv_event_t e);
 static void draw_list(lv_obj_t * obj);
 
@@ -538,8 +538,9 @@ static lv_obj_t * lv_dropdown_list_create(lv_obj_t * parent)
     return lv_obj_create_from_class(&lv_dropdownlist_class, parent);
 }
 
-static void lv_dropdown_constructor(lv_obj_t * obj)
+static void lv_dropdown_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_dropdown_t * dropdown = (lv_dropdown_t *)obj;
@@ -564,8 +565,9 @@ static void lv_dropdown_constructor(lv_obj_t * obj)
     LV_TRACE_OBJ_CREATE("finished");
 }
 
-static void lv_dropdown_destructor(lv_obj_t * obj)
+static void lv_dropdown_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_dropdown_t * dropdown = (lv_dropdown_t *)obj;
 
     if(dropdown->list) {
@@ -579,8 +581,9 @@ static void lv_dropdown_destructor(lv_obj_t * obj)
     }
 }
 
-static void lv_dropdownlist_constructor(lv_obj_t * obj)
+static void lv_dropdownlist_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_obj_clear_flag(obj, LV_OBJ_FLAG_SCROLL_ON_FOCUS);
@@ -589,8 +592,9 @@ static void lv_dropdownlist_constructor(lv_obj_t * obj)
     LV_TRACE_OBJ_CREATE("finished");
 }
 
-static void lv_dropdownlist_destructor(lv_obj_t * list_obj)
+static void lv_dropdownlist_destructor(const lv_obj_class_t * class_p, lv_obj_t * list_obj)
 {
+    LV_UNUSED(class_p);
     lv_dropdown_list_t * list = (lv_dropdown_list_t *)list_obj;
     lv_obj_t * dropdown_obj = list->dropdown;
     lv_dropdown_t * dropdown = (lv_dropdown_t *)dropdown_obj;
diff --git a/src/widgets/lv_img.c b/src/widgets/lv_img.c
index d9a1ab855..fcc55f37b 100644
--- a/src/widgets/lv_img.c
+++ b/src/widgets/lv_img.c
@@ -28,8 +28,8 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_img_constructor(lv_obj_t * obj);
-static void lv_img_destructor(lv_obj_t * obj);
+static void lv_img_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_img_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_img_event(lv_obj_t * obj, lv_event_t e);
 static void draw_img(lv_obj_t * obj, lv_event_t e);
 
@@ -360,8 +360,9 @@ bool lv_img_get_antialias(lv_obj_t * obj)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_img_constructor(lv_obj_t * obj)
+static void lv_img_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_img_t * img = (lv_img_t *)obj;
@@ -385,8 +386,9 @@ static void lv_img_constructor(lv_obj_t * obj)
     LV_TRACE_OBJ_CREATE("finished");
 }
 
-static void lv_img_destructor(lv_obj_t * obj)
+static void lv_img_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_img_t * img = (lv_img_t *)obj;
     if(img->src_type == LV_IMG_SRC_FILE || img->src_type == LV_IMG_SRC_SYMBOL) {
         lv_mem_free((void*)img->src);
diff --git a/src/widgets/lv_label.c b/src/widgets/lv_label.c
index 44e4b548a..25edcc164 100644
--- a/src/widgets/lv_label.c
+++ b/src/widgets/lv_label.c
@@ -34,8 +34,8 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_label_constructor(lv_obj_t * obj);
-static void lv_label_destructor(lv_obj_t * obj);
+static void lv_label_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_label_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_label_event_cb(lv_obj_t * obj, lv_event_t e);
 static void draw_main(lv_obj_t * obj);
 
@@ -692,8 +692,9 @@ void lv_label_cut_text(lv_obj_t * obj, uint32_t pos, uint32_t cnt)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_label_constructor(lv_obj_t * obj)
+static void lv_label_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_label_t * label = (lv_label_t *)obj;
@@ -727,8 +728,9 @@ static void lv_label_constructor(lv_obj_t * obj)
     LV_TRACE_OBJ_CREATE("finished");
 }
 
-static void lv_label_destructor(lv_obj_t * obj)
+static void lv_label_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_label_t * label = (lv_label_t *)obj;
 
     lv_label_dot_tmp_free(obj);
diff --git a/src/widgets/lv_line.c b/src/widgets/lv_line.c
index e2dc36ce3..fddef75f1 100644
--- a/src/widgets/lv_line.c
+++ b/src/widgets/lv_line.c
@@ -28,7 +28,7 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_line_constructor(lv_obj_t * obj);
+static void lv_line_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_line_event(lv_obj_t * obj, lv_event_t e);
 
 /**********************
@@ -103,8 +103,9 @@ bool lv_line_get_y_invert(const lv_obj_t * obj)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_line_constructor(lv_obj_t * obj)
+static void lv_line_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_line_t * line = (lv_line_t *)obj;
diff --git a/src/widgets/lv_meter.c b/src/widgets/lv_meter.c
index 1f97fde5f..3f1639cf2 100644
--- a/src/widgets/lv_meter.c
+++ b/src/widgets/lv_meter.c
@@ -27,8 +27,8 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_meter_constructor(lv_obj_t * obj);
-static void lv_meter_destructor(lv_obj_t * obj);
+static void lv_meter_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_meter_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_meter_event(lv_obj_t * obj, lv_event_t e);
 static void draw_arcs(lv_obj_t * obj, const lv_area_t * clip_area, const lv_area_t * scale_area);
 static void draw_ticks_and_labels(lv_obj_t * obj, const lv_area_t * clip_area, const lv_area_t * scale_area);
@@ -246,8 +246,9 @@ void lv_meter_set_indicator_end_value(lv_obj_t * obj, lv_meter_indicator_t * ind
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_meter_constructor(lv_obj_t * obj)
+static void lv_meter_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_meter_t * meter = (lv_meter_t *)obj;
@@ -257,8 +258,9 @@ static void lv_meter_constructor(lv_obj_t * obj)
     LV_TRACE_OBJ_CREATE("finished");
 }
 
-static void lv_meter_destructor(lv_obj_t * obj)
+static void lv_meter_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_meter_t * meter = (lv_meter_t *)obj;
     lv_meter_scale_t * scale;
     scale = _lv_ll_get_head(&meter->scale_ll);
diff --git a/src/widgets/lv_roller.c b/src/widgets/lv_roller.c
index b9ed4645a..3fcc384d8 100644
--- a/src/widgets/lv_roller.c
+++ b/src/widgets/lv_roller.c
@@ -28,7 +28,7 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_roller_constructor(lv_obj_t * obj);
+static void lv_roller_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_roller_event(lv_obj_t * obj, lv_event_t e);
 static void lv_roller_label_event(lv_obj_t * label, lv_event_t e);
 static void draw_main(lv_obj_t * obj, lv_event_t e);
@@ -283,8 +283,9 @@ uint16_t lv_roller_get_option_cnt(const lv_obj_t * obj)
  **********************/
 
 
-static void lv_roller_constructor(lv_obj_t * obj)
+static void lv_roller_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_roller_t * roller = (lv_roller_t*)obj;
 
     roller->mode = LV_ROLLER_MODE_NORMAL;
diff --git a/src/widgets/lv_slider.c b/src/widgets/lv_slider.c
index 352d1093b..62927c5f9 100644
--- a/src/widgets/lv_slider.c
+++ b/src/widgets/lv_slider.c
@@ -31,7 +31,7 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_slider_constructor(lv_obj_t * obj);
+static void lv_slider_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_slider_event(lv_obj_t * obj, lv_event_t e);
 static void position_knob(lv_obj_t * obj, lv_area_t * knob_area, lv_coord_t knob_size, bool hor);
 static void draw_knob(lv_obj_t * obj);
@@ -74,8 +74,9 @@ bool lv_slider_is_dragged(const lv_obj_t * obj)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_slider_constructor(lv_obj_t * obj)
+static void lv_slider_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_slider_t * slider = (lv_slider_t *)obj;
 
     /*Initialize the allocated 'slider'*/
diff --git a/src/widgets/lv_switch.c b/src/widgets/lv_switch.c
index 8ef76a18e..62887a92b 100644
--- a/src/widgets/lv_switch.c
+++ b/src/widgets/lv_switch.c
@@ -33,7 +33,7 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_switch_constructor(lv_obj_t * obj);
+static void lv_switch_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_switch_event(lv_obj_t * obj, lv_event_t e);
 static void draw_main(lv_obj_t * obj);
 
@@ -68,8 +68,9 @@ lv_obj_t * lv_switch_create(lv_obj_t * parent)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_switch_constructor(lv_obj_t * obj)
+static void lv_switch_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
    lv_obj_clear_flag(obj, LV_OBJ_FLAG_SCROLLABLE);
diff --git a/src/widgets/lv_table.c b/src/widgets/lv_table.c
index 9c3b07d44..7de7e0518 100644
--- a/src/widgets/lv_table.c
+++ b/src/widgets/lv_table.c
@@ -29,8 +29,8 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_table_constructor(lv_obj_t * obj);
-static void lv_table_destructor(lv_obj_t * obj);
+static void lv_table_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_table_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_table_event(lv_obj_t * obj, lv_event_t e);
 static void draw_main(lv_obj_t * obj);
 static lv_coord_t get_row_height(lv_obj_t * obj, uint16_t row_id, const lv_font_t * font,
@@ -402,8 +402,9 @@ void lv_table_get_selected_cell(lv_obj_t * obj, uint16_t * row, uint16_t * col)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_table_constructor(lv_obj_t * obj)
+static void lv_table_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_table_t * table = (lv_table_t *)obj;
@@ -420,8 +421,9 @@ static void lv_table_constructor(lv_obj_t * obj)
     LV_TRACE_OBJ_CREATE("finished");
 }
 
-static void lv_table_destructor(lv_obj_t * obj)
+static void lv_table_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     lv_table_t * table = (lv_table_t *)obj;
     /*Free the cell texts*/
     uint16_t i;
diff --git a/src/widgets/lv_textarea.c b/src/widgets/lv_textarea.c
index 61981f6f0..d68c45eb9 100644
--- a/src/widgets/lv_textarea.c
+++ b/src/widgets/lv_textarea.c
@@ -42,8 +42,8 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static void lv_textarea_constructor(lv_obj_t * obj);
-static void lv_textarea_destructor(lv_obj_t * obj);
+static void lv_textarea_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
+static void lv_textarea_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_textarea_event(lv_obj_t * obj, lv_event_t e);
 static void cursor_blink_anim_cb(void * obj, int32_t show);
 static void pwd_char_hider_anim(void * obj, int32_t x);
@@ -795,40 +795,42 @@ void lv_textarea_cursor_up(lv_obj_t * obj)
  *   STATIC FUNCTIONS
  **********************/
 
-static void lv_textarea_constructor(lv_obj_t * obj)
+static void lv_textarea_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_textarea_t * ta = (lv_textarea_t *)obj;
 
-      ta->pwd_mode          = 0;
-      ta->pwd_tmp           = NULL;
-      ta->pwd_show_time     = LV_TEXTAREA_DEF_PWD_SHOW_TIME;
-      ta->accepted_chars    = NULL;
-      ta->max_length        = 0;
-      ta->cursor.show      = 1;
-      ta->cursor.pos        = 0;
-      ta->cursor.click_pos  = 1;
-      ta->cursor.valid_x    = 0;
-      ta->one_line          = 0;
-  #if LV_LABEL_TEXT_SEL
-      ta->text_sel_en = 0;
-  #endif
-      ta->label       = NULL;
-      ta->placeholder_txt = NULL;
+    ta->pwd_mode          = 0;
+    ta->pwd_tmp           = NULL;
+    ta->pwd_show_time     = LV_TEXTAREA_DEF_PWD_SHOW_TIME;
+    ta->accepted_chars    = NULL;
+    ta->max_length        = 0;
+    ta->cursor.show      = 1;
+    ta->cursor.pos        = 0;
+    ta->cursor.click_pos  = 1;
+    ta->cursor.valid_x    = 0;
+    ta->one_line          = 0;
+#if LV_LABEL_TEXT_SEL
+    ta->text_sel_en = 0;
+#endif
+    ta->label       = NULL;
+    ta->placeholder_txt = NULL;
 
-      ta->label = lv_label_create(obj);
-      lv_label_set_long_mode(ta->label, LV_LABEL_LONG_WRAP);
-      lv_label_set_text(ta->label, "");
-      lv_obj_add_flag(obj, LV_OBJ_FLAG_SCROLL_ON_FOCUS);
+    ta->label = lv_label_create(obj);
+    lv_label_set_long_mode(ta->label, LV_LABEL_LONG_WRAP);
+    lv_label_set_text(ta->label, "");
+    lv_obj_add_flag(obj, LV_OBJ_FLAG_SCROLL_ON_FOCUS);
 
-      start_cursor_blink(obj);
+    start_cursor_blink(obj);
 
-      LV_TRACE_OBJ_CREATE("finished");
+    LV_TRACE_OBJ_CREATE("finished");
 }
 
-static void lv_textarea_destructor(lv_obj_t * obj)
+static void lv_textarea_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_UNUSED(class_p);
 
     lv_textarea_t * ta = (lv_textarea_t *)obj;
     if(ta->pwd_tmp != NULL) {