博客

• pressing事件处理回调函数

static void drag_event_handler(lv_event_t* e)
{
    lv_obj_t* obj = lv_event_get_target(e); //获取事件产生的对象
    lv_indev_t* indev = lv_indev_get_act();  //获取活动界面输入设备
    lv_point_t vect;
    lv_indev_get_vect(indev, &vect); //获取vect point
    lv_coord_t x = lv_obj_get_x(obj) + vect.x; //计算x
    lv_coord_t y = lv_obj_get_y(obj) + vect.y; // 计算y
    lv_obj_set_pos(obj, x, y); //移动对象到x,y
}

• 创建对象并添加pressing点击中事件

static void lv_example_obj_2(void)
{
    lv_obj_t* obj;
    obj = lv_obj_create(lv_scr_act());
    lv_obj_set_size(obj, 150, 100);  //设置大小
    lv_obj_add_event_cb(obj, drag_event_handler, LV_EVENT_PRESSING, NULL); //添加pressing事件
    lv_obj_t* label = lv_label_create(obj); //obj对象上创建label
    lv_label_set_text(label, "Drag me"); //设置显示内容
    lv_obj_center(label); //居中obj对齐
}

• 运行效果图