Unity 新UI事件系統(EventSystem) Demo

Unity 新UI事件系統(EventSystem) Demo

時間：2015-03-06 16:59:57      閱讀：4986      評論：0      收藏：0      [點我收藏+]

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新的UI系統消息傳遞被全新設計，該系統用MonoBehaviour 來實現自定義的接口，以便可以接受來自消息系統的回調。當一個對象被消息的執行指定，那麼這個對象的所有實現了自定義接口的腳本將被通知，指定的方法將被執行。

 

1.定義一個接口ICustomMessageTarget繼承IEventSystemHandler， 這樣當發送此類型消息時，實現此接口的腳本所在的對象將會被通知。

using UnityEngine;
using UnityEngine.EventSystems;
using System.Collections;

public interface ICustomMessageTarget : IEventSystemHandler
{
    void Message1();
    void Message2();
}

2.測試腳本CustomMessageTarget實現ICustomMessageTarget，加到一個對象上。

using UnityEngine;
using System.Collections;

public class CustomMessageTarget : MonoBehaviour , ICustomMessageTarget
{

    public void Message1()
    {
        Debug.Log("Message1 received.");
    }
    public void Message2()
    {
        Debug.Log("Message2 received.");
    }
}

這樣當執行下面代碼時事件將被觸發

 ExecuteEvents.Execute<ICustomMessageTarget>(go, null, (x, y) => x.Message1());

 

同時EventSystem還提供了大量的事件， 只需要在腳本中實現這些接口就可以觸發相應的方法

• IPointerEnterHandler - OnPointerEnter - Called when a pointer enters the object
• IPointerExitHandler - OnPointerExit - Called when a pointer exits the object
• IPointerDownHandler - OnPointerDown - Called when a pointer is pressed on the object
• IPointerUpHandler - OnPointerUp - Called when a pointer is released (called on the original the pressed object)
• IPointerClickHandler - OnPointerClick - Called when a pointer is pressed and released on the same object
• IInitializePotentialDragHandler - OnInitializePotentialDrag - Called when a drag target is found, can be used to initialise values
• IBeginDragHandler - OnBeginDrag - Called on the drag object when dragging is about to begin
• IDragHandler - OnDrag - Called on the drag object when a drag is happening
• IEndDragHandler - OnEndDrag - Called on the drag object when a drag finishes
• IDropHandler - OnDrop - Called on the object where a drag finishes
• IScrollHandler - OnScroll - Called when a mouse wheel scrolls
• IUpdateSelectedHandler - OnUpdateSelected - Called on the selected object each tick
• ISelectHandler - OnSelect - Called when the object becomes the selected object
• IDeselectHandler - OnDeselect - Called on the selected object becomes deselected
• IMoveHandler - OnMove - Called when a move event occurs (left, right, up, down, ect)
• ISubmitHandler - OnSubmit - Called when the submit button is pressed
• ICancelHandler - OnCancel - Called when the cancel button is pressed

例子：

using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems;

public class TestPointerEnterEvent : MonoBehaviour , IPointerEnterHandler , IPointerClickHandler
{

    public void OnPointerEnter(PointerEventData data)
    {
        Debug.Log("Pointer enter.");
    }

    public void OnPointerClick(PointerEventData data)
    {
        Debug.Log("Pointer click.");
    }
}