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using System;
using System.Collections.Generic;
using UnityEngine.Events;
using UnityEngine.Serialization;
namespace UnityEngine.EventSystems
{
//c 一个辅助组件，给一个事件添加自定义的回调函数
//继承了所有接口，效率不高，慎用。只是比较方便
[AddComponentMenu("Event/Event Trigger")]
public class EventTrigger :
MonoBehaviour,
IPointerEnterHandler,
IPointerExitHandler,
IPointerDownHandler,
IPointerUpHandler,
IPointerClickHandler,
IInitializePotentialDragHandler,
IBeginDragHandler,
IDragHandler,
IEndDragHandler,
IDropHandler,
IScrollHandler,
IUpdateSelectedHandler,
ISelectHandler,
IDeselectHandler,
IMoveHandler,
ISubmitHandler,
ICancelHandler
{
[Serializable]
public class TriggerEvent : UnityEvent<BaseEventData>
{}
[Serializable]
public class Entry
{
public EventTriggerType eventID = EventTriggerType.PointerClick;
public TriggerEvent callback = new TriggerEvent();
}
[FormerlySerializedAs("delegates")]
[SerializeField]
private List<Entry> m_Delegates;
[Obsolete("Please use triggers instead (UnityUpgradable) -> triggers", true)]
public List<Entry> delegates;
protected EventTrigger()
{}
public List<Entry> triggers
{
get
{
if (m_Delegates == null)
m_Delegates = new List<Entry>();
return m_Delegates;
}
set { m_Delegates = value; }
}
private void Execute(EventTriggerType id, BaseEventData eventData)
{
for (int i = 0, imax = triggers.Count; i < imax; ++i)
{
var ent = triggers[i];
if (ent.eventID == id && ent.callback != null)
ent.callback.Invoke(eventData);
}
}
public virtual void OnPointerEnter(PointerEventData eventData)
{
Execute(EventTriggerType.PointerEnter, eventData);
}
public virtual void OnPointerExit(PointerEventData eventData)
{
Execute(EventTriggerType.PointerExit, eventData);
}
public virtual void OnDrag(PointerEventData eventData)
{
Execute(EventTriggerType.Drag, eventData);
}
public virtual void OnDrop(PointerEventData eventData)
{
Execute(EventTriggerType.Drop, eventData);
}
public virtual void OnPointerDown(PointerEventData eventData)
{
Execute(EventTriggerType.PointerDown, eventData);
}
public virtual void OnPointerUp(PointerEventData eventData)
{
Execute(EventTriggerType.PointerUp, eventData);
}
public virtual void OnPointerClick(PointerEventData eventData)
{
Execute(EventTriggerType.PointerClick, eventData);
}
public virtual void OnSelect(BaseEventData eventData)
{
Execute(EventTriggerType.Select, eventData);
}
public virtual void OnDeselect(BaseEventData eventData)
{
Execute(EventTriggerType.Deselect, eventData);
}
public virtual void OnScroll(PointerEventData eventData)
{
Execute(EventTriggerType.Scroll, eventData);
}
public virtual void OnMove(AxisEventData eventData)
{
Execute(EventTriggerType.Move, eventData);
}
public virtual void OnUpdateSelected(BaseEventData eventData)
{
Execute(EventTriggerType.UpdateSelected, eventData);
}
public virtual void OnInitializePotentialDrag(PointerEventData eventData)
{
Execute(EventTriggerType.InitializePotentialDrag, eventData);
}
public virtual void OnBeginDrag(PointerEventData eventData)
{
Execute(EventTriggerType.BeginDrag, eventData);
}
public virtual void OnEndDrag(PointerEventData eventData)
{
Execute(EventTriggerType.EndDrag, eventData);
}
public virtual void OnSubmit(BaseEventData eventData)
{
Execute(EventTriggerType.Submit, eventData);
}
public virtual void OnCancel(BaseEventData eventData)
{
Execute(EventTriggerType.Cancel, eventData);
}
}
}
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