LVGL 8.2 Simple Colorwheel

创建Colorwheel

static void lv_example_colorwheel_1(void)
{
    lv_obj_t* cw;
    cw = lv_colorwheel_create(lv_scr_act(), true); //创建colorwheel对象
    lv_obj_set_size(cw, 200, 200); //设置大小
    lv_obj_center(cw);  //居中显示
}

运行效果

增加颜色改变回调处理

static void event_handler(lv_event_t* e)
{
    lv_event_code_t code =  lv_event_get_code(e);
    lv_obj_t* obj = lv_event_get_target(e);
    if (code == LV_EVENT_VALUE_CHANGED)
    {
        lv_color_t color = lv_colorwheel_get_rgb(obj);
        
        LV_LOG_USER("Selected color is %x", color.full);
    }
}

static void lv_example_colorwheel_1(void)
{
    lv_obj_t* cw;
    cw = lv_colorwheel_create(lv_scr_act(), true); //创建colorwheel对象
    lv_obj_set_size(cw, 200, 200); //设置大小
    lv_obj_center(cw);  //居中显示
    lv_obj_add_event_cb(cw, event_handler, LV_EVENT_VALUE_CHANGED, NULL);
  
}

运行效果