support transition on virtual styles too

src/lv_core/lv_obj.c

@@ -57,6 +57,7 @@ typedef struct _lv_event_temp_data
 typedef struct {
     lv_obj_t * obj;
     lv_style_property_t prop;
+    uint8_t part;
     union {
         lv_color_t _color;
         lv_style_int_t _int;
@@ -89,8 +90,8 @@ static void opa_scale_anim(lv_obj_t * obj, lv_anim_value_t v);
 #endif
 static void lv_event_mark_deleted(lv_obj_t * obj);
 static void lv_obj_del_async_cb(void * obj);
-static lv_anim_trans_t * trans_create(lv_obj_t * obj, lv_style_property_t prop, lv_state_t prev_state, lv_state_t new_state);
+static lv_anim_trans_t * trans_create(lv_obj_t * obj, lv_style_property_t prop, uint8_t part, lv_state_t prev_state, lv_state_t new_state);
-static void trans_del(lv_obj_t * obj, lv_style_property_t prop);
+static void trans_del(lv_obj_t * obj, uint8_t part, lv_style_property_t prop);
 
 /**********************
  *  STATIC VARIABLES
@@ -398,6 +399,8 @@ lv_res_t lv_obj_del(lv_obj_t * obj)
     lv_anim_del(obj, NULL);
 #endif
 
+    trans_del(obj, 0xFF, 0xFF);
+
     /*Delete the user data*/
 #if LV_USE_USER_DATA_FREE
     LV_USER_DATA_FREE(obj);
@@ -1123,20 +1126,37 @@ void lv_obj_add_style(lv_obj_t * obj, uint8_t part, lv_style_t * style)
 }
 
 /**
- * Remove all styles from the objects style list. Also reset the local styles
+ * Reset a style to the default (empty) state.
+ * Release all used memories and cancel pending related transitions.
+ * Typically used in `LV_SIGN_CLEAN_UP.
+ * @param obj pointer to an object
+ * @param part the part of the object which style list should be reseted.
+ * E.g. `LV_OBJ_PART_MAIN`, `LV_BTN_PART_MAIN`, `LV_SLIDER_PART_KNOB`
+ */
+void lv_obj_clean_style_list(lv_obj_t * obj, uint8_t part)
+{
+    lv_style_list_t * style_dsc = lv_obj_get_style_list(obj, part);
+    if(style_dsc == NULL) {
+        LV_LOG_WARN("lv_obj_clean_style_list: can't find style with `part`");
+        return;
+    }
+
+    lv_style_list_reset(style_dsc);
+
+    trans_del(obj, part, 0xFF);
+}
+
+/**
+ * Reset a style to the default (empty) state.
+ * Release all used memories and cancel pending related transitions.
+ * Also notifies the object about the style change.
  * @param obj pointer to an object
  * @param part the part of the object which style list should be reseted.
  * E.g. `LV_OBJ_PART_MAIN`, `LV_BTN_PART_MAIN`, `LV_SLIDER_PART_KNOB`
  */
 void lv_obj_reset_style_list(lv_obj_t * obj, uint8_t part)
 {
-    lv_style_list_t * style_dsc = lv_obj_get_style_list(obj, part);
+    lv_obj_clean_style_list(obj, part);
-    if(style_dsc == NULL) {
-        LV_LOG_WARN("lv_obj_clean_styles: can't find style with `part`");
-        return;
-    }
-
-    lv_style_list_reset(style_dsc);
 
     lv_obj_refresh_style(obj);
 }
@@ -1465,30 +1485,36 @@ void lv_obj_set_state(lv_obj_t * obj, lv_state_t new_state)
     lv_state_t prev_state = obj->state_dsc.act;
     obj->state_dsc.act = new_state;
 
-    lv_style_int_t time = lv_obj_get_style_trans_time(obj, LV_OBJ_PART_MAIN);
+    uint8_t part;
-    lv_style_property_t props[LV_STYLE_TRANS_NUM_MAX];
+    for(part = 0; part < _LV_OBJ_PART_REAL_LAST; part++) {
-    lv_style_int_t delay = lv_obj_get_style_trans_delay(obj, LV_OBJ_PART_MAIN);
+        lv_style_list_t * style_list = lv_obj_get_style_list(obj, part);
-    lv_anim_path_cb_t path = lv_obj_get_style_trans_path(obj, LV_OBJ_PART_MAIN);
+        if(style_list == NULL) break;   /*No more style lists*/
-    props[0] = lv_obj_get_style_trans_prop1(obj, LV_OBJ_PART_MAIN);
+        if(style_list->ignore_trans) continue;
-    props[1] = lv_obj_get_style_trans_prop2(obj, LV_OBJ_PART_MAIN);
+
-    props[2] = lv_obj_get_style_trans_prop3(obj, LV_OBJ_PART_MAIN);
+        lv_style_int_t time = lv_obj_get_style_trans_time(obj, part);
-    props[3] = lv_obj_get_style_trans_prop4(obj, LV_OBJ_PART_MAIN);
+        lv_style_property_t props[LV_STYLE_TRANS_NUM_MAX];
-    props[4] = lv_obj_get_style_trans_prop5(obj, LV_OBJ_PART_MAIN);
+        lv_style_int_t delay = lv_obj_get_style_trans_delay(obj, part);
-    props[5] = lv_obj_get_style_trans_prop6(obj, LV_OBJ_PART_MAIN);
+        lv_anim_path_cb_t path = lv_obj_get_style_trans_path(obj, part);
+        props[0] = lv_obj_get_style_trans_prop1(obj, part);
+        props[1] = lv_obj_get_style_trans_prop2(obj, part);
+        props[2] = lv_obj_get_style_trans_prop3(obj, part);
+        props[3] = lv_obj_get_style_trans_prop4(obj, part);
+        props[4] = lv_obj_get_style_trans_prop5(obj, part);
+        props[5] = lv_obj_get_style_trans_prop6(obj, part);
 
-    lv_style_list_t * style_list = lv_obj_get_style_list(obj, LV_OBJ_PART_MAIN);
 
         uint8_t i;
         for(i = 0; i < LV_STYLE_TRANS_NUM_MAX; i++) {
             if(props[i] != 0) {
                 lv_style_list_add_trans_style(style_list);
 
-            lv_anim_trans_t * tr = trans_create(obj, props[i], prev_state, new_state);
+                lv_anim_trans_t * tr = trans_create(obj, props[i], part, prev_state, new_state);
 
                 /*If there is a pending anim for this property remove it*/
                 if(tr) {
                     tr->obj = obj;
                     tr->prop = props[i];
+                    tr->part = part;
 
                     if(time == 0) {
                         trans_anim_cb(tr, 255);
@@ -1511,29 +1537,30 @@ void lv_obj_set_state(lv_obj_t * obj, lv_state_t new_state)
             }
 #endif
         }
+    }
 
     lv_obj_refresh_style(obj);
 
 }
 
-static lv_anim_trans_t * trans_create(lv_obj_t * obj, lv_style_property_t prop, lv_state_t prev_state, lv_state_t new_state)
+static lv_anim_trans_t * trans_create(lv_obj_t * obj, lv_style_property_t prop, uint8_t part, lv_state_t prev_state, lv_state_t new_state)
 {
     lv_anim_trans_t * tr;
-    lv_style_list_t * style_list = lv_obj_get_style_list(obj, LV_OBJ_PART_MAIN);
+    lv_style_list_t * style_list = lv_obj_get_style_list(obj, part);
     lv_style_t * style_trans = lv_style_list_get_trans_style(style_list);
 
     /*Get the previous and current values*/
     if((prop & 0xF) < LV_STYLE_ID_COLOR) { /*Int*/
         style_list->skip_trans = 1;
         obj->state_dsc.act = prev_state;
-        lv_style_int_t int1 = _lv_obj_get_style_int(obj, LV_OBJ_PART_MAIN, prop);
+        lv_style_int_t int1 = _lv_obj_get_style_int(obj, part, prop);
         obj->state_dsc.act = new_state;
-        lv_style_int_t int2 =  _lv_obj_get_style_int(obj, LV_OBJ_PART_MAIN, prop);
+        lv_style_int_t int2 =  _lv_obj_get_style_int(obj, part, prop);
         style_list->skip_trans = 0;
 
         if(int1 == int2)  return NULL;
         obj->state_dsc.act = prev_state;
-        int1 = _lv_obj_get_style_int(obj, LV_OBJ_PART_MAIN, prop);
+        int1 = _lv_obj_get_style_int(obj, part, prop);
         obj->state_dsc.act = new_state;
         _lv_style_set_int(style_trans, prop, int1);   /*Be sure `trans_style` has a valid value */
 
@@ -1555,14 +1582,14 @@ static lv_anim_trans_t * trans_create(lv_obj_t * obj, lv_style_property_t prop,
     else if((prop & 0xF) < LV_STYLE_ID_OPA) { /*Color*/
         style_list->skip_trans = 1;
         obj->state_dsc.act = prev_state;
-        lv_color_t c1 = _lv_obj_get_style_color(obj, LV_OBJ_PART_MAIN, prop);
+        lv_color_t c1 = _lv_obj_get_style_color(obj, part, prop);
         obj->state_dsc.act = new_state;
-        lv_color_t c2 =  _lv_obj_get_style_color(obj, LV_OBJ_PART_MAIN, prop);
+        lv_color_t c2 =  _lv_obj_get_style_color(obj, part, prop);
         style_list->skip_trans = 0;
 
         if(c1.full == c2.full) return NULL;
         obj->state_dsc.act = prev_state;
-        c1 = _lv_obj_get_style_color(obj, LV_OBJ_PART_MAIN, prop);
+        c1 = _lv_obj_get_style_color(obj, part, prop);
         obj->state_dsc.act = new_state;
         _lv_style_set_color(style_trans, prop, c1);    /*Be sure `trans_style` has a valid value */
 
@@ -1575,15 +1602,15 @@ static lv_anim_trans_t * trans_create(lv_obj_t * obj, lv_style_property_t prop,
     else if((prop & 0xF) < LV_STYLE_ID_PTR) { /*Opa*/
         style_list->skip_trans = 1;
         obj->state_dsc.act = prev_state;
-        lv_opa_t o1 = _lv_obj_get_style_opa(obj, LV_OBJ_PART_MAIN, prop);
+        lv_opa_t o1 = _lv_obj_get_style_opa(obj, part, prop);
         obj->state_dsc.act = new_state;
-        lv_opa_t o2 =  _lv_obj_get_style_opa(obj, LV_OBJ_PART_MAIN, prop);
+        lv_opa_t o2 =  _lv_obj_get_style_opa(obj, part, prop);
         style_list->skip_trans = 0;
 
         if(o1 == o2) return NULL;
 
         obj->state_dsc.act = prev_state;
-        o1 = _lv_obj_get_style_opa(obj, LV_OBJ_PART_MAIN, prop);
+        o1 = _lv_obj_get_style_opa(obj, part, prop);
         obj->state_dsc.act = new_state;
         _lv_style_set_opa(style_trans, prop, o1);   /*Be sure `trans_style` has a valid value */
 
@@ -1595,14 +1622,14 @@ static lv_anim_trans_t * trans_create(lv_obj_t * obj, lv_style_property_t prop,
     } else {    /*Ptr*/
         obj->state_dsc.act = prev_state;
         style_list->skip_trans = 1;
-        const void * p1 = _lv_obj_get_style_ptr(obj, LV_OBJ_PART_MAIN, prop);
+        const void * p1 = _lv_obj_get_style_ptr(obj, part, prop);
         obj->state_dsc.act = new_state;
-        const void * p2 =  _lv_obj_get_style_ptr(obj, LV_OBJ_PART_MAIN, prop);
+        const void * p2 =  _lv_obj_get_style_ptr(obj, part, prop);
         style_list->skip_trans = 0;
 
         if(p1 == p2)  return NULL;
         obj->state_dsc.act = prev_state;
-        p1 = _lv_obj_get_style_ptr(obj, LV_OBJ_PART_MAIN, prop);
+        p1 = _lv_obj_get_style_ptr(obj, part, prop);
         obj->state_dsc.act = new_state;
         _lv_style_set_ptr(style_trans, prop, p1);   /*Be sure `trans_style` has a valid value */
 
@@ -1616,7 +1643,7 @@ static lv_anim_trans_t * trans_create(lv_obj_t * obj, lv_style_property_t prop,
     return tr;
 }
 
-static void trans_del(lv_obj_t * obj, lv_style_property_t prop)
+static void trans_del(lv_obj_t * obj, uint8_t part, lv_style_property_t prop)
 {
     lv_anim_trans_t * tr;
     lv_anim_trans_t * tr_next;
@@ -1625,7 +1652,7 @@ static void trans_del(lv_obj_t * obj, lv_style_property_t prop)
        /*'tr' might be deleted, so get the next object while 'tr' is valid*/
        tr_next = lv_ll_get_next(&LV_GC_ROOT(_lv_obj_style_trans_ll), tr);
 
-        if(tr->obj == obj && (prop == tr->prop || prop == 0xFF)) {
+        if(tr->obj == obj && (part == tr->part || part == 0xFF) && (prop == tr->prop || prop == 0xFF)) {
             lv_anim_del(tr, NULL);
             lv_ll_remove(&LV_GC_ROOT(_lv_obj_style_trans_ll), tr);
             lv_mem_free(tr);
@@ -3379,8 +3406,7 @@ static lv_res_t lv_obj_signal(lv_obj_t * obj, lv_signal_t sign, void * param)
     }
 #endif
     else if(sign == LV_SIGNAL_CLEANUP) {
-
+        lv_obj_clean_style_list(obj, LV_OBJ_PART_MAIN);
-        lv_style_list_reset(&obj->style_list);
     }
 
     return res;
@@ -3550,7 +3576,7 @@ static void base_dir_refr_children(lv_obj_t * obj)
 
 static void trans_anim_cb(lv_anim_trans_t * tr, lv_anim_value_t v)
 {
-    lv_style_list_t * list = lv_obj_get_style_list(tr->obj, LV_OBJ_PART_MAIN);
+    lv_style_list_t * list = lv_obj_get_style_list(tr->obj, tr->part);
     lv_style_t * style = lv_style_list_get_trans_style(list);
 
     if((tr->prop & 0xF) < LV_STYLE_ID_COLOR) { /*Value*/
@@ -3591,21 +3617,21 @@ static void trans_anim_start_cb(lv_anim_t * a)
     /*Init prop to an invalid values to be sure `trans_del` won't delete the just added `tr`*/
     tr->prop = 0;
     /*Delete the relate transition if any*/
-    trans_del(tr->obj, prop_tmp);
+    trans_del(tr->obj, tr->part, prop_tmp);
 
     tr->prop = prop_tmp;
 
-    /*Get the previous and current values*/
+    /*Start the animation from the current value*/
     if((prop_tmp & 0xF) < LV_STYLE_ID_COLOR) { /*Int*/
-        tr->start_value._int = _lv_obj_get_style_int(tr->obj, LV_OBJ_PART_MAIN, prop_tmp);
+        tr->start_value._int = _lv_obj_get_style_int(tr->obj, tr->part, prop_tmp);
     }
     else if((prop_tmp & 0xF) < LV_STYLE_ID_OPA) { /*Color*/
-        tr->start_value._color = _lv_obj_get_style_color(tr->obj, LV_OBJ_PART_MAIN, prop_tmp);
+        tr->start_value._color = _lv_obj_get_style_color(tr->obj, tr->part, prop_tmp);
     }
     else if((prop_tmp & 0xF) < LV_STYLE_ID_PTR) { /*Opa*/
-        tr->start_value._opa = _lv_obj_get_style_opa(tr->obj, LV_OBJ_PART_MAIN, prop_tmp);
+        tr->start_value._opa = _lv_obj_get_style_opa(tr->obj, tr->part, prop_tmp);
     } else {    /*Ptr*/
-        tr->start_value._ptr= _lv_obj_get_style_ptr(tr->obj, LV_OBJ_PART_MAIN, prop_tmp);
+        tr->start_value._ptr= _lv_obj_get_style_ptr(tr->obj, tr->part, prop_tmp);
     }
 
 

src/lv_core/lv_obj.h

@@ -487,7 +487,19 @@ void lv_obj_set_ext_click_area(lv_obj_t * obj, lv_coord_t left, lv_coord_t right
 void lv_obj_add_style(lv_obj_t * obj, uint8_t part, lv_style_t * style);
 
 /**
- * Remove all styles from the objects style list. Also reset the local styles
+ * Reset a style to the default (empty) state.
+ * Release all used memories and cancel pending related transitions.
+ * Typically used in `LV_SIGN_CLEAN_UP.
+ * @param obj pointer to an object
+ * @param part the part of the object which style list should be reseted.
+ * E.g. `LV_OBJ_PART_MAIN`, `LV_BTN_PART_MAIN`, `LV_SLIDER_PART_KNOB`
+ */
+void lv_obj_clean_style_list(lv_obj_t * obj, uint8_t part);
+
+/**
+ * Reset a style to the default (empty) state.
+ * Release all used memories and cancel pending related transitions.
+ * Also notifies the object about the style change.
  * @param obj pointer to an object
  * @param part the part of the object which style list should be reseted.
  * E.g. `LV_OBJ_PART_MAIN`, `LV_BTN_PART_MAIN`, `LV_SLIDER_PART_KNOB`

src/lv_core/lv_style.c

@@ -60,7 +60,7 @@ static lv_style_t * get_alloc_local_style(lv_style_list_t * list);
  */
 void lv_style_init(lv_style_t * style)
 {
-    style->map = NULL;
+    memset(style, 0x00, sizeof(lv_style_t));
 #if LV_USE_ASSERT_STYLE
     style->sentinel = LV_DEBUG_STYLE_SENTINEL_VALUE;
 #endif
@@ -136,10 +136,7 @@ bool lv_style_remove_prop(lv_style_t * style, lv_style_property_t prop)
  */
 void lv_style_list_init(lv_style_list_t * list)
 {
-    list->style_list = NULL;
+    memset(list, 0x00, sizeof(lv_style_list_t));
-    list->style_cnt = 0;
-    list->has_local = 0;
-    list->has_trans = 0;
 #if LV_USE_ASSERT_STYLE
     list->sentinel = LV_DEBUG_STYLE_LIST_SENTINEL_VALUE;
 #endif
@@ -709,6 +706,12 @@ lv_style_t * lv_style_list_add_trans_style(lv_style_list_t * list)
     lv_style_list_add_style(list, trans_style);
     list->has_trans = 1;
 
+    /*If the list has local style trans was added after it. But trans should be the first so swap them*/
+    if(list->has_local) {
+        lv_style_t * tmp = list->style_list[0];
+        list->style_list[0] = list->style_list[1];
+        list->style_list[1] = tmp;
+    }
     return trans_style;
 }
 

src/lv_core/lv_style.h

@@ -226,7 +226,8 @@ typedef struct {
     uint8_t style_cnt;
     uint8_t has_local    :1;
     uint8_t has_trans    :1;
-    uint8_t skip_trans   :1;
+    uint8_t skip_trans   :1;        /*1: Temporally skip the transition style if any*/
+    uint8_t ignore_trans   :1;      /*1: Mark that this style list shouldn't receive transitions at all*/
 }lv_style_list_t;
 
 /**********************

src/lv_themes/lv_theme_material.c

@@ -336,12 +336,16 @@ static void slider_init(void)
     lv_style_init(&slider_knob);
     lv_style_set_bg_opa(&slider_knob, LV_STATE_NORMAL, LV_OPA_COVER);
     lv_style_set_bg_color(&slider_knob, LV_STATE_NORMAL, LV_COLOR_WHITE);
+    lv_style_set_bg_color(&slider_knob, LV_STATE_FOCUSED, LV_COLOR_RED);
     lv_style_set_value_color(&slider_knob, LV_STATE_NORMAL, LV_COLOR_WHITE);
     lv_style_set_radius(&slider_knob, LV_STATE_NORMAL, LV_RADIUS_CIRCLE);
     lv_style_set_pad_left(&slider_knob, LV_STATE_NORMAL, LV_DPI/20);
     lv_style_set_pad_right(&slider_knob, LV_STATE_NORMAL, LV_DPI/20);
     lv_style_set_pad_top(&slider_knob, LV_STATE_NORMAL, LV_DPI/20);
     lv_style_set_pad_bottom(&slider_knob, LV_STATE_NORMAL, LV_DPI/20);
+    lv_style_set_trans_time(&slider_knob, LV_STATE_NORMAL, 500);
+    lv_style_set_trans_prop1(&slider_knob, LV_STATE_NORMAL, LV_STYLE_BG_COLOR);
+
 #endif
 }
 
@@ -896,240 +900,239 @@ void lv_theme_material_apply(lv_obj_t * obj, lv_theme_style_t name)
         break;
 
     case LV_THEME_SCR:
+        lv_obj_clean_style_list(obj, LV_OBJ_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_OBJ_PART_MAIN);
-        lv_style_list_reset(list);
+lv_style_list_add_style(list, &scr);
-        lv_style_list_add_style(list, &scr);
         break;
     case LV_THEME_OBJ:
+        lv_obj_clean_style_list(obj, LV_OBJ_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_OBJ_PART_MAIN);
-        lv_style_list_reset(list);
+lv_style_list_add_style(list, &panel);
-        lv_style_list_add_style(list, &panel);
         break;
 #if LV_USE_CONT
     case LV_THEME_CONT:
+        lv_obj_clean_style_list(obj, LV_OBJ_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_CONT_PART_MAIN);
-        lv_style_list_reset(list);
+lv_style_list_add_style(list, &panel);
-        lv_style_list_add_style(list, &panel);
         break;
 #endif
 
 #if LV_USE_BTN
     case LV_THEME_BTN:
+        lv_obj_clean_style_list(obj, LV_BTN_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_BTN_PART_MAIN);
-        lv_style_list_reset(list);
+lv_style_list_add_style(list, &btn);
-        lv_style_list_add_style(list, &btn);
         break;
 #endif
 
 #if LV_USE_BTNMATRIX
     case LV_THEME_BTNMATRIX:
+        lv_obj_clean_style_list(obj, LV_BTNMATRIX_PART_BG);
         list = lv_obj_get_style_list(obj, LV_BTNMATRIX_PART_BG);
-        lv_style_list_reset(list);
-        lv_style_list_add_style(list, &btnm_bg);
 
+        lv_obj_clean_style_list(obj, LV_BTNMATRIX_PART_BTN);
         list = lv_obj_get_style_list(obj, LV_BTNMATRIX_PART_BTN);
-        lv_style_list_reset(list);
+lv_style_list_add_style(list, &btn);
-        lv_style_list_add_style(list, &btn);
+lv_style_list_add_style(list, &btnm_btn);
-        lv_style_list_add_style(list, &btnm_btn);
         break;
 #endif
 
 #if LV_USE_KEYBOARD
     case LV_THEME_KEYBOARD:
+        lv_obj_clean_style_list(obj, LV_KEYBOARD_PART_BG);
         list = lv_obj_get_style_list(obj, LV_KEYBOARD_PART_BG);
-        lv_style_list_reset(list);
+lv_style_list_add_style(list, &kb_bg);
-        lv_style_list_add_style(list, &kb_bg);
 
+        lv_obj_clean_style_list(obj, LV_KEYBOARD_PART_BTN);
         list = lv_obj_get_style_list(obj, LV_KEYBOARD_PART_BTN);
-        lv_style_list_reset(list);
+lv_style_list_add_style(list, &btn);
-        lv_style_list_add_style(list, &btn);
+lv_style_list_add_style(list, &kb_btn);
-        lv_style_list_add_style(list, &kb_btn);
         break;
 #endif
 
 #if LV_USE_BAR
     case LV_THEME_BAR:
+        lv_obj_clean_style_list(obj, LV_BAR_PART_BG);
         list = lv_obj_get_style_list(obj, LV_BAR_PART_BG);
-        lv_style_list_reset(list);
-        lv_style_list_add_style(list, &bar_bg);
 
+lv_style_list_add_style(list, &bar_bg);
+
+        lv_obj_clean_style_list(obj, LV_BAR_PART_INDIC);
         list = lv_obj_get_style_list(obj, LV_BAR_PART_INDIC);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &bar_indic);
         break;
 #endif
 
 #if LV_USE_SWITCH
     case LV_THEME_SWITCH:
+        lv_obj_clean_style_list(obj, LV_SWITCH_PART_BG);
         list = lv_obj_get_style_list(obj, LV_SWITCH_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &bar_bg);
 
+        lv_obj_clean_style_list(obj, LV_SWITCH_PART_INDIC);
         list = lv_obj_get_style_list(obj, LV_SWITCH_PART_INDIC);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &bar_indic);
 
+        lv_obj_clean_style_list(obj, LV_SWITCH_PART_KNOB);
         list = lv_obj_get_style_list(obj, LV_SWITCH_PART_KNOB);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &sw_knob);
         break;
 #endif
 
 #if LV_USE_CANVAS
     case LV_THEME_CANVAS:
+        lv_obj_clean_style_list(obj, LV_CANVAS_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_CANVAS_PART_MAIN);
-        lv_style_list_reset(list);
         break;
 #endif
 
 #if LV_USE_IMG
     case LV_THEME_IMAGE:
+        lv_obj_clean_style_list(obj, LV_IMG_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_IMG_PART_MAIN);
-        lv_style_list_reset(list);
         break;
 #endif
 
 #if LV_USE_IMGBTN
     case LV_THEME_IMGBTN:
+        lv_obj_clean_style_list(obj, LV_IMG_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_IMG_PART_MAIN);
-        lv_style_list_reset(list);
         break;
 #endif
 
 #if LV_USE_LABEL
     case LV_THEME_LABEL:
+        lv_obj_clean_style_list(obj, LV_LABEL_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_LABEL_PART_MAIN);
-        lv_style_list_reset(list);
         break;
 #endif
 
 #if LV_USE_LINE
     case LV_THEME_LINE:
+        lv_obj_clean_style_list(obj, LV_LABEL_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_LABEL_PART_MAIN);
-        lv_style_list_reset(list);
         break;
 #endif
 
 #if LV_USE_ARC
     case LV_THEME_ARC:
+        lv_obj_clean_style_list(obj, LV_ARC_PART_BG);
         list = lv_obj_get_style_list(obj, LV_ARC_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &arc_bg);
 
+        lv_obj_clean_style_list(obj, LV_ARC_PART_ARC);
         list = lv_obj_get_style_list(obj, LV_ARC_PART_ARC);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &arc);
         break;
 #endif
 
 #if LV_USE_SPINNER
     case LV_THEME_SPINNER:
+        lv_obj_clean_style_list(obj, LV_SPINNER_PART_BG);
         list = lv_obj_get_style_list(obj, LV_SPINNER_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &arc_bg);
 
+        lv_obj_clean_style_list(obj, LV_SPINNER_PART_ARC);
         list = lv_obj_get_style_list(obj, LV_SPINNER_PART_ARC);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &arc);
         break;
 #endif
 
 #if LV_USE_SLIDER
     case LV_THEME_SLIDER:
+        lv_obj_clean_style_list(obj, LV_SLIDER_PART_BG);
         list = lv_obj_get_style_list(obj, LV_SLIDER_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &bar_bg);
 
+        lv_obj_clean_style_list(obj, LV_SLIDER_PART_INDIC);
         list = lv_obj_get_style_list(obj, LV_SLIDER_PART_INDIC);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &bar_indic);
 
+        lv_obj_clean_style_list(obj, LV_SLIDER_PART_KNOB);
         list = lv_obj_get_style_list(obj, LV_SLIDER_PART_KNOB);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &slider_knob);
         break;
 #endif
 
 #if LV_USE_CHECKBOX
     case LV_THEME_CHECKBOX:
+        lv_obj_clean_style_list(obj, LV_CHECKBOX_PART_BG);
         list = lv_obj_get_style_list(obj, LV_CHECKBOX_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &cb_bg);
 
+        lv_obj_clean_style_list(obj, LV_CHECKBOX_PART_BULLET);
         list = lv_obj_get_style_list(obj, LV_CHECKBOX_PART_BULLET);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &cb_bullet);
         break;
 #endif
 
 #if LV_USE_MSGBOX
     case LV_THEME_MSGBOX:
+        lv_obj_clean_style_list(obj, LV_MSGBOX_PART_BG);
         list = lv_obj_get_style_list(obj, LV_MSGBOX_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &bg);
         break;
 
     case LV_THEME_MSGBOX_BTNS:
+        lv_obj_clean_style_list(obj, LV_MSGBOX_PART_BTN_BG);
         list = lv_obj_get_style_list(obj, LV_MSGBOX_PART_BTN_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &mbox_btn_bg);
 
+        lv_obj_clean_style_list(obj, LV_MSGBOX_PART_BTN);
         list = lv_obj_get_style_list(obj, LV_MSGBOX_PART_BTN);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &btn);
         break;
 
 #endif
 #if LV_USE_LED
     case LV_THEME_LED:
+        lv_obj_clean_style_list(obj, LV_LED_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_LED_PART_MAIN);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &led);
         break;
 #endif
 #if LV_USE_PAGE
     case LV_THEME_PAGE:
+        lv_obj_clean_style_list(obj, LV_PAGE_PART_BG);
         list = lv_obj_get_style_list(obj, LV_PAGE_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &panel);
 
+        lv_obj_clean_style_list(obj, LV_PAGE_PART_SCRL);
         list = lv_obj_get_style_list(obj, LV_PAGE_PART_SCRL);
-        lv_style_list_reset(list);
 
+        lv_obj_clean_style_list(obj, LV_PAGE_PART_SCRLBAR);
         list = lv_obj_get_style_list(obj, LV_PAGE_PART_SCRLBAR);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &sb);
         break;
 #endif
 #if LV_USE_TABVIEW
     case LV_THEME_TABVIEW:
+        lv_obj_clean_style_list(obj, LV_TABVIEW_PART_BG);
         list = lv_obj_get_style_list(obj, LV_TABVIEW_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &scr);
 
+        lv_obj_clean_style_list(obj, LV_TABVIEW_PART_BG_SCRL);
         list = lv_obj_get_style_list(obj, LV_TABVIEW_PART_BG_SCRL);
-        lv_style_list_reset(list);
 
+        lv_obj_clean_style_list(obj, LV_TABVIEW_PART_TAB_BG);
         list = lv_obj_get_style_list(obj, LV_TABVIEW_PART_TAB_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &tabview_btns_bg);
 
-
+        lv_obj_clean_style_list(obj, LV_TABVIEW_PART_INDIC);
         list = lv_obj_get_style_list(obj, LV_TABVIEW_PART_INDIC);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &tabview_indic);
 
+        lv_obj_clean_style_list(obj, LV_TABVIEW_PART_TAB);
         list = lv_obj_get_style_list(obj, LV_TABVIEW_PART_TAB);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &tabview_btns);
         break;
 
     case LV_THEME_TABVIEW_PAGE:
+        lv_obj_clean_style_list(obj, LV_PAGE_PART_BG);
         list = lv_obj_get_style_list(obj, LV_PAGE_PART_BG);
-        lv_style_list_reset(list);
 
+        lv_obj_clean_style_list(obj, LV_PAGE_PART_SCRL);
         list = lv_obj_get_style_list(obj, LV_PAGE_PART_SCRL);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &tabview_page_scrl);
 
         break;
@@ -1137,16 +1140,16 @@ void lv_theme_material_apply(lv_obj_t * obj, lv_theme_style_t name)
 
 #if LV_USE_TILEVIEW
     case LV_THEME_TILEVIEW:
+        lv_obj_clean_style_list(obj, LV_TILEVIEW_PART_BG);
         list = lv_obj_get_style_list(obj, LV_TILEVIEW_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &scr);
 
+        lv_obj_clean_style_list(obj, LV_TILEVIEW_PART_SCRLBAR);
         list = lv_obj_get_style_list(obj, LV_TILEVIEW_PART_SCRLBAR);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &sb);
 
+        lv_obj_clean_style_list(obj, LV_TILEVIEW_PART_EDGE_FLASH);
         list = lv_obj_get_style_list(obj, LV_TILEVIEW_PART_EDGE_FLASH);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &btn);
         break;
 #endif
@@ -1154,12 +1157,12 @@ void lv_theme_material_apply(lv_obj_t * obj, lv_theme_style_t name)
 
 #if LV_USE_ROLLER
     case LV_THEME_ROLLER:
+        lv_obj_clean_style_list(obj, LV_ROLLER_PART_BG);
         list = lv_obj_get_style_list(obj, LV_ROLLER_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &roller_bg);
 
+        lv_obj_clean_style_list(obj, LV_ROLLER_PART_SEL);
         list = lv_obj_get_style_list(obj, LV_ROLLER_PART_SEL);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &roller_sel);
         break;
 #endif
@@ -1167,149 +1170,150 @@ void lv_theme_material_apply(lv_obj_t * obj, lv_theme_style_t name)
 
 #if LV_USE_OBJMASK
     case LV_THEME_OBJMASK:
+        lv_obj_clean_style_list(obj, LV_OBJMASK_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_OBJMASK_PART_MAIN);
-        lv_style_list_reset(list);
         break;
 #endif
 
 #if LV_USE_LIST
     case LV_THEME_LIST:
+        lv_obj_clean_style_list(obj, LV_LIST_PART_BG);
         list = lv_obj_get_style_list(obj, LV_LIST_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &list_bg);
 
+        lv_obj_clean_style_list(obj, LV_LIST_PART_SCRL);
         list = lv_obj_get_style_list(obj, LV_LIST_PART_SCRL);
-        lv_style_list_reset(list);
 
+        lv_obj_clean_style_list(obj, LV_LIST_PART_SCRLBAR);
         list = lv_obj_get_style_list(obj, LV_LIST_PART_SCRLBAR);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &sb);
         break;
 
     case LV_THEME_LIST_BTN:
+        lv_obj_clean_style_list(obj, LV_BTN_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_BTN_PART_MAIN);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &list_btn);
         break;
 #endif
 
 #if LV_USE_DROPDOWN
     case LV_THEME_DROPDOWN:
+        lv_obj_clean_style_list(obj, LV_DROPDOWN_PART_BTN);
         list = lv_obj_get_style_list(obj, LV_DROPDOWN_PART_BTN);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &ddlist_btn);
 
+        lv_obj_clean_style_list(obj, LV_DROPDOWN_PART_LIST);
         list = lv_obj_get_style_list(obj, LV_DROPDOWN_PART_LIST);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &ddlist_page);
 
+        lv_obj_clean_style_list(obj, LV_DROPDOWN_PART_SCRLBAR);
         list = lv_obj_get_style_list(obj, LV_DROPDOWN_PART_SCRLBAR);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &sb);
 
+        lv_obj_clean_style_list(obj, LV_DROPDOWN_PART_SELECTED);
         list = lv_obj_get_style_list(obj, LV_DROPDOWN_PART_SELECTED);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &ddlist_sel);
         break;
 #endif
 
 #if LV_USE_CHART
     case LV_THEME_CHART:
+        lv_obj_clean_style_list(obj, LV_CHART_PART_BG);
         list = lv_obj_get_style_list(obj, LV_CHART_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &panel);
 
+        lv_obj_clean_style_list(obj, LV_CHART_PART_SERIES_BG);
         list = lv_obj_get_style_list(obj, LV_CHART_PART_SERIES_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &chart_series_bg);
 
+        lv_obj_clean_style_list(obj, LV_CHART_PART_SERIES);
         list = lv_obj_get_style_list(obj, LV_CHART_PART_SERIES);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &chart_series);
         break;
 #endif
 #if LV_USE_TABLE
     case LV_THEME_TABLE:
+        lv_obj_clean_style_list(obj, LV_TABLE_PART_BG);
         list = lv_obj_get_style_list(obj, LV_TABLE_PART_BG);
-        lv_style_list_reset(list);
 
+        lv_obj_clean_style_list(obj, LV_TABLE_PART_CELL1);
         list = lv_obj_get_style_list(obj, LV_TABLE_PART_CELL1);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &table_cell);
 
+        lv_obj_clean_style_list(obj, LV_TABLE_PART_CELL2);
         list = lv_obj_get_style_list(obj, LV_TABLE_PART_CELL2);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &table_cell);
 
+        lv_obj_clean_style_list(obj, LV_TABLE_PART_CELL3);
         list = lv_obj_get_style_list(obj, LV_TABLE_PART_CELL3);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &table_cell);
 
+        lv_obj_clean_style_list(obj, LV_TABLE_PART_CELL4);
         list = lv_obj_get_style_list(obj, LV_TABLE_PART_CELL4);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &table_cell);
         break;
 #endif
 
 #if LV_USE_WIN
     case LV_THEME_WIN:
+        lv_obj_clean_style_list(obj, LV_WIN_PART_BG);
         list = lv_obj_get_style_list(obj, LV_WIN_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &scr);
 
+        lv_obj_clean_style_list(obj, LV_WIN_PART_SCRLBAR);
         list = lv_obj_get_style_list(obj, LV_WIN_PART_SCRLBAR);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &sb);
 
+        lv_obj_clean_style_list(obj, LV_WIN_PART_CONTENT_SCRL);
         list = lv_obj_get_style_list(obj, LV_WIN_PART_CONTENT_SCRL);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &tabview_page_scrl);
 
+        lv_obj_clean_style_list(obj, LV_WIN_PART_HEADER);
         list = lv_obj_get_style_list(obj, LV_WIN_PART_HEADER);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &tabview_btns_bg);
         break;
+
     case LV_THEME_WIN_BTN:
+        lv_obj_clean_style_list(obj, LV_BTN_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_BTN_PART_MAIN);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &tabview_btns);
         break;
 #endif
 
 #if LV_USE_TEXTAREA
     case LV_THEME_TEXTAREA:
+        lv_obj_clean_style_list(obj, LV_TEXTAREA_PART_BG);
         list = lv_obj_get_style_list(obj, LV_TEXTAREA_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &ta_bg);
 
+        lv_obj_clean_style_list(obj, LV_TEXTAREA_PART_PLACEHOLDER);
         list = lv_obj_get_style_list(obj, LV_TEXTAREA_PART_PLACEHOLDER);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &ta_placeholder);
 
+        lv_obj_clean_style_list(obj, LV_TEXTAREA_PART_CURSOR);
         list = lv_obj_get_style_list(obj, LV_TEXTAREA_PART_CURSOR);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &ta_cursor);
 
+        lv_obj_clean_style_list(obj, LV_TEXTAREA_PART_SCRLBAR);
         list = lv_obj_get_style_list(obj, LV_TEXTAREA_PART_SCRLBAR);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &sb);
         break;
 
     case LV_THEME_TEXTAREA_ONELINE:
+        lv_obj_clean_style_list(obj, LV_TEXTAREA_PART_BG);
         list = lv_obj_get_style_list(obj, LV_TEXTAREA_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &ta_oneline);
 
+        lv_obj_clean_style_list(obj, LV_TEXTAREA_PART_PLACEHOLDER);
         list = lv_obj_get_style_list(obj, LV_TEXTAREA_PART_PLACEHOLDER);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &ta_placeholder);
 
+        lv_obj_clean_style_list(obj, LV_TEXTAREA_PART_CURSOR);
         list = lv_obj_get_style_list(obj, LV_TEXTAREA_PART_CURSOR);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &ta_cursor);
 
+        lv_obj_clean_style_list(obj, LV_TEXTAREA_PART_SCRLBAR);
         list = lv_obj_get_style_list(obj, LV_TEXTAREA_PART_SCRLBAR);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &sb);
         break;
 #endif
@@ -1317,72 +1321,72 @@ void lv_theme_material_apply(lv_obj_t * obj, lv_theme_style_t name)
 
 #if LV_USE_SPINBOX
     case LV_THEME_SPINBOX:
+        lv_obj_clean_style_list(obj, LV_SPINBOX_PART_BG);
         list = lv_obj_get_style_list(obj, LV_SPINBOX_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &ta_bg);
 
+        lv_obj_clean_style_list(obj, LV_SPINBOX_PART_CURSOR);
         list = lv_obj_get_style_list(obj, LV_SPINBOX_PART_CURSOR);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &spinbox_cursor);
         break;
 
     case LV_THEME_SPINBOX_BTN:
+        lv_obj_clean_style_list(obj, LV_BTN_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_BTN_PART_MAIN);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &spinbox_btn);
         break;
 #endif
 
 #if LV_USE_CALENDAR
     case LV_THEME_CALENDAR:
+        lv_obj_clean_style_list(obj, LV_CALENDAR_PART_BG);
         list = lv_obj_get_style_list(obj, LV_CALENDAR_PART_BG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &panel);
 
+        lv_obj_clean_style_list(obj, LV_CALENDAR_PART_DATE);
         list = lv_obj_get_style_list(obj, LV_CALENDAR_PART_DATE);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &calendar_date_nums);
 
+        lv_obj_clean_style_list(obj, LV_CALENDAR_PART_HEADER);
         list = lv_obj_get_style_list(obj, LV_CALENDAR_PART_HEADER);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &calendar_header);
 
+        lv_obj_clean_style_list(obj, LV_CALENDAR_PART_DAY_NAMES);
         list = lv_obj_get_style_list(obj, LV_CALENDAR_PART_DAY_NAMES);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &calendar_daynames);
         break;
 #endif
 #if LV_USE_CPICKER
     case LV_THEME_CPICKER:
+        lv_obj_clean_style_list(obj, LV_CPICKER_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_CPICKER_PART_MAIN);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &cpicker_bg);
 
+        lv_obj_clean_style_list(obj, LV_CPICKER_PART_INDIC);
         list = lv_obj_get_style_list(obj, LV_CPICKER_PART_INDIC);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &cpicker_indic);
         break;
 #endif
 
-#if LV_USE_LMETER
+#if LV_USE_LINEMETER
     case LV_THEME_LINEMETER:
+        lv_obj_clean_style_list(obj, LV_LINEMETER_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_LINEMETER_PART_MAIN);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &lmeter);
         break;
 #endif
 #if LV_USE_GAUGE
     case LV_THEME_GAUGE:
+        lv_obj_clean_style_list(obj, LV_GAUGE_PART_MAIN);
         list = lv_obj_get_style_list(obj, LV_GAUGE_PART_MAIN);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &gauge_main);
 
+        lv_obj_clean_style_list(obj, LV_GAUGE_PART_STRONG);
         list = lv_obj_get_style_list(obj, LV_GAUGE_PART_STRONG);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &gauge_strong);
 
+        lv_obj_clean_style_list(obj, LV_GAUGE_PART_NEEDLE);
         list = lv_obj_get_style_list(obj, LV_GAUGE_PART_NEEDLE);
-        lv_style_list_reset(list);
         lv_style_list_add_style(list, &gauge_needle);
         break;
 #endif

src/lv_widgets/lv_arc.c

@@ -420,7 +420,7 @@ static lv_res_t lv_arc_signal(lv_obj_t * arc, lv_signal_t sign, void * param)
 
     if(sign == LV_SIGNAL_CLEANUP) {
         lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
-        lv_style_list_reset(&ext->style_arc);
+        lv_obj_clean_style_list(arc, LV_ARC_PART_ARC);
     }
 
     return res;

src/lv_widgets/lv_bar.c

@@ -627,7 +627,7 @@ static lv_res_t lv_bar_signal(lv_obj_t * bar, lv_signal_t sign, void * param)
     }
 	if(sign == LV_SIGNAL_CLEANUP) {
 	    lv_bar_ext_t * ext = lv_obj_get_ext_attr(bar);
-        lv_style_list_reset(&ext->style_indic);
+        lv_obj_clean_style_list(bar, LV_BAR_PART_INDIC);
 #if LV_USE_ANIMATION
 		lv_anim_del(&ext->cur_value_anim, NULL);
 		lv_anim_del(&ext->start_value_anim, NULL);

src/lv_widgets/lv_btnmatrix.c

@@ -97,6 +97,7 @@ lv_obj_t * lv_btnmatrix_create(lv_obj_t * par, const lv_obj_t * copy)
     ext->recolor        = 0;
     ext->one_toggle     = 0;
     lv_style_list_init(&ext->style_btn);
+    ext->style_btn.ignore_trans = 1;
 
     if(ancestor_design_f == NULL) ancestor_design_f = lv_obj_get_design_cb(btnm);
 
@@ -778,6 +779,7 @@ static lv_res_t lv_btnmatrix_signal(lv_obj_t * btnm, lv_signal_t sign, void * pa
     lv_btnmatrix_ext_t * ext = lv_obj_get_ext_attr(btnm);
     lv_point_t p;
     if(sign == LV_SIGNAL_CLEANUP) {
+        lv_obj_clean_style_list(btnm, LV_BTNMATRIX_PART_BTN);
         lv_mem_free(ext->button_areas);
         lv_mem_free(ext->ctrl_bits);
     } else if(sign == LV_SIGNAL_STYLE_CHG) {

src/lv_widgets/lv_calendar.c

@@ -119,6 +119,9 @@ lv_obj_t * lv_calendar_create(lv_obj_t * par, const lv_obj_t * copy)
     lv_style_list_init(&ext->style_date_nums);
     lv_style_list_init(&ext->style_day_names);
     lv_style_list_init(&ext->style_header);
+    ext->style_date_nums.skip_trans = 1;
+    ext->style_day_names.skip_trans = 1;
+    ext->style_header.skip_trans = 1;
 
     /*The signal and design functions are not copied so set them here*/
     lv_obj_set_signal_cb(calendar, lv_calendar_signal);
@@ -426,10 +429,9 @@ static lv_res_t lv_calendar_signal(lv_obj_t * calendar, lv_signal_t sign, void *
     if(sign == LV_SIGNAL_GET_TYPE) return lv_obj_handle_get_type_signal(param, LV_OBJX_NAME);
 
     if(sign == LV_SIGNAL_CLEANUP) {
-        lv_calendar_ext_t * ext = lv_obj_get_ext_attr(calendar);
+        lv_obj_clean_style_list(calendar, LV_CALENDAR_PART_HEADER);
-        lv_style_list_reset(&ext->style_header);
+        lv_obj_clean_style_list(calendar, LV_CALENDAR_PART_DAY_NAMES);
-        lv_style_list_reset(&ext->style_day_names);
+        lv_obj_clean_style_list(calendar, LV_CALENDAR_PART_DATE);
-        lv_style_list_reset(&ext->style_date_nums);
     } else if(sign == LV_SIGNAL_PRESSING) {
         lv_calendar_ext_t * ext = lv_obj_get_ext_attr(calendar);
         lv_area_t header_area;
@@ -459,7 +461,7 @@ static lv_res_t lv_calendar_signal(lv_obj_t * calendar, lv_signal_t sign, void *
             ext->btn_pressing = 0;
             lv_obj_invalidate(calendar);
         }
-        /*ELse set a default state*/
+        /*Else set a default state*/
         else {
             if(ext->btn_pressing != 0) lv_obj_invalidate(calendar);
             ext->btn_pressing       = 0;

src/lv_widgets/lv_chart.c

@@ -653,8 +653,8 @@ static lv_res_t lv_chart_signal(lv_obj_t * chart, lv_signal_t sign, void * param
         }
         lv_ll_clear(&ext->series_ll);
 
-        lv_style_list_reset(&ext->style_series);
+        lv_obj_clean_style_list(chart, LV_CHART_PART_SERIES);
-        lv_style_list_reset(&ext->style_series_bg);
+        lv_obj_clean_style_list(chart, LV_CHART_PART_SERIES_BG);
     }
 
     return res;

src/lv_widgets/lv_cpicker.c

@@ -661,7 +661,7 @@ static lv_res_t lv_cpicker_signal(lv_obj_t * cpicker, lv_signal_t sign, void * p
     lv_cpicker_ext_t * ext = lv_obj_get_ext_attr(cpicker);
 
     if(sign == LV_SIGNAL_CLEANUP) {
-        lv_style_list_reset(&ext->indic.style_list);
+        lv_obj_clean_style_list(cpicker, LV_CPICKER_PART_INDIC);
     } else if(sign == LV_SIGNAL_REFR_EXT_DRAW_PAD) {
         lv_style_int_t left = lv_obj_get_style_pad_left(cpicker, LV_CPICKER_PART_INDIC);
         lv_style_int_t right = lv_obj_get_style_pad_right(cpicker, LV_CPICKER_PART_INDIC);

src/lv_widgets/lv_dropdown.c

@@ -467,7 +467,7 @@ void lv_dropdown_open(lv_obj_t * ddlist, lv_anim_enable_t anim)
 
     lv_style_list_copy(lv_obj_get_style_list(ext->page, LV_PAGE_PART_BG), &ext->style_page);
     lv_style_list_copy(lv_obj_get_style_list(ext->page, LV_PAGE_PART_SCRLBAR), &ext->style_scrlbar);
-    lv_style_list_reset(lv_obj_get_style_list(ext->page, LV_PAGE_PART_SCRL));
+    lv_obj_clean_style_list(ext->page, LV_PAGE_PART_SCRL);
     lv_obj_refresh_style(ext->page);
 
     lv_page_set_scrl_fit(ext->page, LV_FIT_TIGHT);
@@ -742,9 +742,13 @@ static lv_res_t lv_dropdown_signal(lv_obj_t * ddlist, lv_signal_t sign, void * p
     }
     else if(sign == LV_SIGNAL_CLEANUP) {
         lv_dropdown_close(ddlist, LV_ANIM_OFF);
+
+        /*`lv_obj_clean_style_list` is not required because these styles are only copied to the page
+         * so they can have transitions or other object related things. */
         lv_style_list_reset(&ext->style_page);
         lv_style_list_reset(&ext->style_scrlbar);
         lv_style_list_reset(&ext->style_selected);
+
     }
     else if(sign == LV_SIGNAL_FOCUS) {
 #if LV_USE_GROUP

src/lv_widgets/lv_gauge.c

@@ -397,8 +397,8 @@ static lv_res_t lv_gauge_signal(lv_obj_t * gauge, lv_signal_t sign, void * param
     if(sign == LV_SIGNAL_CLEANUP) {
         lv_mem_free(ext->values);
         ext->values = NULL;
-        lv_style_list_reset(&ext->style_needle);
+        lv_obj_clean_style_list(gauge, LV_GAUGE_PART_NEEDLE);
-        lv_style_list_reset(&ext->style_strong);
+        lv_obj_clean_style_list(gauge, LV_GAUGE_PART_STRONG);
     }
 
     return res;

src/lv_widgets/lv_page.c

@@ -741,9 +741,9 @@ static lv_res_t lv_page_signal(lv_obj_t * page, lv_signal_t sign, void * param)
             }
         }
 
-        lv_style_list_reset(&ext->scrlbar.style);
+        lv_obj_clean_style_list(page, LV_PAGE_PART_SCRLBAR);
 #if LV_USE_ANIMATION
-        lv_style_list_reset(&ext->edge_flash.style);
+        lv_obj_clean_style_list(page, LV_PAGE_PART_EDGE_FLASH);
 #endif
     }
     /*Automatically move children to the scrollable object*/
@@ -1013,10 +1013,6 @@ static lv_res_t lv_page_scrollable_signal(lv_obj_t * scrl, lv_signal_t sign, voi
     }
     else if(sign == LV_SIGNAL_CLEANUP) {
         page_ext->scrl = NULL;
-#if LV_USE_ANIMATION
-        lv_style_list_reset(&page_ext->edge_flash.style);
-#endif
-        lv_style_list_reset(&page_ext->scrlbar.style);
 
     }
     return res;

src/lv_widgets/lv_roller.c

@@ -111,7 +111,8 @@ lv_obj_t * lv_roller_create(lv_obj_t * par, const lv_obj_t * copy)
 
         lv_obj_set_signal_cb(scrl, lv_roller_scrl_signal);
 
-        lv_style_list_reset(lv_obj_get_style_list(roller, LV_PAGE_PART_SCRL));
+
+        lv_obj_clean_style_list(roller, LV_PAGE_PART_SCRL); /*Use a transparent scrollable*/
         lv_theme_apply(roller, LV_THEME_ROLLER);
         refr_height(roller);
 

src/lv_widgets/lv_slider.c

@@ -377,7 +377,7 @@ static lv_res_t lv_slider_signal(lv_obj_t * slider, lv_signal_t sign, void * par
             if(res != LV_RES_OK) return res;
         }
     } else if(sign == LV_SIGNAL_CLEANUP) {
-        lv_style_list_reset(&ext->style_knob);
+        lv_obj_clean_style_list(slider, LV_SLIDER_PART_KNOB);
     } else if(sign == LV_SIGNAL_GET_EDITABLE) {
         bool * editable = (bool *)param;
         *editable       = true;

src/lv_widgets/lv_switch.c

@@ -278,8 +278,7 @@ static lv_res_t lv_switch_signal(lv_obj_t * sw, lv_signal_t sign, void * param)
     if(res != LV_RES_OK) return res;
 
     if(sign == LV_SIGNAL_CLEANUP) {
-        lv_switch_ext_t * ext = lv_obj_get_ext_attr(sw);
+        lv_obj_clean_style_list(sw, LV_SWITCH_PART_KNOB);
-        lv_style_list_reset(&ext->style_knob);
     } else if(sign == LV_SIGNAL_RELEASED) {
             if(lv_switch_get_state(sw)) lv_switch_off(sw, LV_ANIM_ON);
         else lv_switch_on(sw, LV_ANIM_ON);

src/lv_widgets/lv_table.c

@@ -793,7 +793,7 @@ static lv_res_t lv_table_signal(lv_obj_t * table, lv_signal_t sign, void * param
         if(ext->cell_data != NULL) lv_mem_free(ext->cell_data);
 
         for(i = 0; i < LV_TABLE_CELL_STYLE_CNT; i++) {
-            lv_style_list_reset(&ext->cell_style[i]);
+            lv_obj_clean_style_list(table, LV_TABLE_PART_CELL1 + i);
         }
     }
     else if(sign == LV_SIGNAL_STYLE_CHG) {

src/lv_widgets/lv_tabview.c

@@ -135,13 +135,13 @@ lv_obj_t * lv_tabview_create(lv_obj_t * par, const lv_obj_t * copy)
         lv_obj_set_event_cb(ext->btns, tab_btnm_event_cb);
 
         lv_obj_set_click(ext->indic, false);
+        lv_obj_set_drag_dir(lv_page_get_scrl(ext->content), LV_DRAG_DIR_ONE);
 
         lv_page_set_scrl_fit2(ext->content, LV_FIT_TIGHT, LV_FIT_PARENT);
         lv_page_set_scrl_layout(ext->content, LV_LAYOUT_ROW_TOP);
         lv_page_set_sb_mode(ext->content, LV_SB_MODE_OFF);
-        lv_obj_set_drag_dir(lv_page_get_scrl(ext->content), LV_DRAG_DIR_ONE);
 
-        lv_style_list_reset(lv_obj_get_style_list(ext->content, LV_PAGE_PART_BG));
+        lv_obj_clean_style_list(ext->content, LV_PAGE_PART_BG);
 
         lv_theme_apply(tabview, LV_THEME_TABVIEW);
 

src/lv_widgets/lv_textarea.c

@@ -1361,7 +1361,7 @@ static lv_res_t lv_textarea_signal(lv_obj_t * ta, lv_signal_t sign, void * param
         if(ext->pwd_tmp != NULL) lv_mem_free(ext->pwd_tmp);
         /* (The created label will be deleted automatically) */
 
-        lv_style_list_reset(&ext->cursor.style);
+        lv_obj_clean_style_list(ta, LV_TEXTAREA_PART_CURSOR);
     } else if(sign == LV_SIGNAL_STYLE_CHG) {
         if(ext->label) {
             if(ext->one_line) {

src/lv_widgets/lv_win.c

@@ -95,7 +95,7 @@ lv_obj_t * lv_win_create(lv_obj_t * par, const lv_obj_t * copy)
         ext->page = lv_page_create(new_win, NULL);
         lv_obj_add_protect(ext->page, LV_PROTECT_PARENT);
         lv_page_set_sb_mode(ext->page, LV_SB_MODE_AUTO);
-        lv_style_list_reset(lv_obj_get_style_list(ext->page, LV_PAGE_PART_BG));
+        lv_obj_clean_style_list(ext->page, LV_PAGE_PART_BG);
 
         /*Create a holder for the header*/
         ext->header = lv_obj_create(new_win, NULL);