Tabview realize scrolling cycle

Applications
1

Effect

Code

static void scroll_begin_event(lv_event_t * e)
{
    lv_obj_t * cont = lv_event_get_target(e);
    lv_event_code_t code = lv_event_get_code(e);

    lv_obj_t * tv = lv_obj_get_parent(cont);

    if(lv_event_get_code(e) == LV_EVENT_SCROLL_END) {
        lv_indev_t * indev = lv_indev_active();
        if(indev && lv_indev_get_state(indev) == LV_INDEV_STATE_PRESSED) {
            return;
        }

        int32_t tb_index;
        lv_coord_t s;

        lv_point_t p;
        lv_obj_get_scroll_end(cont, &p);

        if(lv_obj_get_style_flex_flow(lv_tabview_get_tab_bar(tv), 0) != LV_FLEX_FLOW_COLUMN) {
            s = lv_obj_get_scroll_x(cont);

            if(s < 0) tb_index = lv_tabview_get_tab_count(tv) - 1;
            if((tb_index == (lv_tabview_get_tab_count(tv) - 1)) && (s > p.x)) tb_index = 0;
        }
        else {
            s = lv_obj_get_scroll_y(cont);

            if(s < 0) tb_index = lv_tabview_get_tab_count(tv) - 1;
            if((tb_index == (lv_tabview_get_tab_count(tv) - 1)) && (s > p.y)) tb_index = 0;
        }

        bool new_tab = false;
        if(tb_index != (int32_t)lv_tabview_get_tab_active(tv)) new_tab = true;

        /*If not scrolled by an indev set the tab immediately*/
        if(lv_indev_active()) {
            lv_tabview_set_active(tv, tb_index, LV_ANIM_ON);
        }
        else {
            lv_tabview_set_active(tv, tb_index, LV_ANIM_OFF);
        }

        if(new_tab) lv_obj_send_event(tv, LV_EVENT_VALUE_CHANGED, NULL);
    }
}


lv_obj_add_event_cb(lv_tabview_get_content(tabview), scroll_begin_event, LV_EVENT_SCROLL_END, NULL);
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