lv_obj_set_style_border_side() doesn't work!

[aliparto]

LVGL version

v9.1

What happened?

The function "lv_obj_set_style_border_side" is utilized to adjust the border side, as illustrated in the example. However, it encounters issues and fails to be applied to the buttons. The border always drawn at the bottom!

How to reproduce?

lv_obj_t * tabview;
tabview = lv_tabview_create(lv_screen_active());
lv_tabview_set_tab_bar_position(tabview, LV_DIR_LEFT);
lv_tabview_set_tab_bar_size(tabview, 80);

lv_obj_t * tab_buttons = lv_tabview_get_tab_bar(tabview);
lv_obj_set_style_border_side(tab_buttons, LV_BORDER_SIDE_RIGHT, LV_PART_ITEMS | LV_STATE_CHECKED);

[kisvegabor]

Please send a code snippet to reproduce the issue. Note that the slight gray line here is a shadow and not a border:

[aliparto]

Please send a code snippet to reproduce the issue. Note that the slight gray line here is a shadow and not a border:

I tried to change the border side of the selected button of the tab view to the right but it didn't changed and stay at the bottom side (default theme value).
In v8.3 works fine.

[kisvegabor]

Oh, I see now. This border is on the the button, but the container of the buttons. This style is applied on the tab view buttons.

[aliparto]

Thanks, I got it.
Is it possible to customize the style of tab view buttons individually?
I mean if I want to have different tab views on various pages, how can I implement different styles for their respective buttons?

[kisvegabor]

Yes, you can do this to get the buttons:

    lv_obj_t * tab_bar = lv_tabview_get_tab_bar(tv);
    lv_obj_t * btn1 = lv_obj_get_child(tab_bar, 0);
    lv_obj_t * btn2 = lv_obj_get_child(tab_bar, 1);

[lvgl-bot]

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[aliparto]

btn1 

I'm able to access the buttons, but couldn't change the border side!
It seems the sides are following the global style.
I tried these:
lv_obj_set_style_border_side(lv_tabview_get_tab_btns(tab), LV_BORDER_SIDE_RIGHT, LV_PART_ITEMS | LV_STATE_CHECKED);
and
lv_obj_set_style_border_side(lv_tabview_get_tab_btns(tab), LV_BORDER_SIDE_RIGHT, LV_PART_MAIN | LV_STATE_CHECKED);