namespace UnityEngine.EventSystems
{
    public abstract class AbstractEventData
    {
        protected bool m_Used; // 当前事件是否被处理（被吞）

        public virtual void Reset()
        {
            m_Used = false;
        }

        public virtual void Use()
        {
            m_Used = true;
        }

        public virtual bool used
        {
            get { return m_Used; }
        }
    }

    public class BaseEventData : AbstractEventData
    {
        private readonly EventSystem m_EventSystem;
        public BaseEventData(EventSystem eventSystem)
        {
            m_EventSystem = eventSystem;
        }

        public BaseInputModule currentInputModule
        {
            get { return m_EventSystem.currentInputModule; }
        }

        public GameObject selectedObject
        {
            get { return m_EventSystem.currentSelectedGameObject; }
            set { m_EventSystem.SetSelectedGameObject(value, this); } // 会发送一个selecthandler事件
        }
    }
}