彥霖 實驗筆記

本文參考 雨松 MoMo 的文章，加以改良並加入更多監聽事件

原文：http://www.xuanyusong.com/archives/3325


Test.cs

// 請把此程式掛在 Canvas 上，然後拖一張 Sprite 圖片進來

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using System.Collections;

public class Test : MonoBehaviour {

public Sprite img;

    void Start () {
        GameObject g = new GameObject ("My Button", typeof(RectTransform), typeof(Image), typeof(Button), typeof(EventTrigger));

        Transform t = g.transform;
        t.SetParent (transform);
        t.localPosition = Vector3.zero;

        Image img2 = g.GetComponent<Image> ();
        img2.sprite = img;
        img2.SetNativeSize ();

        EventTriggerListener.Get (g).onBeginDrag = OnBeginDrag;
        EventTriggerListener.Get (g).onDrag = OnDrag;
        EventTriggerListener.Get (g).onEndDrag = OnEndDrag;

    }

    public void OnBeginDrag(GameObject g){
        print ("----------- 1");
    }

    public void OnDrag(GameObject g){
        print ("-");
    }

    public void OnEndDrag(GameObject g){
        print ("-------------------- 2");
    }

}

-----------------------------------------------------------------------------

EventTriggerListener.cs

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

public class EventTriggerListener : EventTrigger{

public delegate void VoidDelegate (GameObject go);
public VoidDelegate onClick;
public VoidDelegate onDown;
public VoidDelegate onEnter;
public VoidDelegate onExit;
public VoidDelegate onUp;
public VoidDelegate onSelect;
public VoidDelegate onUpdateSelect;
public VoidDelegate onBeginDrag;
public VoidDelegate onDrag;
public VoidDelegate onCancel;
public VoidDelegate onDeselect;
public VoidDelegate onDrop;
public VoidDelegate onEndDrag;
public VoidDelegate onInitializePotentialDrag;
public VoidDelegate onMove;
public VoidDelegate onScroll;
public VoidDelegate onSubmit;

static public EventTriggerListener Get (GameObject go)
{
EventTriggerListener listener = go.GetComponent<EventTriggerListener>();
if (listener == null) listener = go.AddComponent<EventTriggerListener>();
return listener;
}

public override void OnPointerClick(PointerEventData eventData)
{
if(onClick != null) onClick(gameObject);
}

public override void OnPointerDown (PointerEventData eventData){
if(onDown != null) onDown(gameObject);
}

public override void OnPointerEnter (PointerEventData eventData){
if(onEnter != null) onEnter(gameObject);
}

public override void OnPointerExit (PointerEventData eventData){
if(onExit != null) onExit(gameObject);
}

public override void OnPointerUp (PointerEventData eventData){
if(onUp != null) onUp(gameObject);
}

public override void OnSelect (BaseEventData eventData){
if(onSelect != null) onSelect(gameObject);
}

public override void OnUpdateSelected (BaseEventData eventData){
if(onUpdateSelect != null) onUpdateSelect(gameObject);
}

public override void OnBeginDrag (PointerEventData eventData){
if(onBeginDrag != null) onBeginDrag(gameObject);
}

public override void OnDrag (PointerEventData eventData){
if(onDrag != null) onDrag(gameObject);
}

public override void OnCancel (BaseEventData eventData){
if(onCancel != null) onCancel(gameObject);
}

public override void OnDeselect (BaseEventData eventData){
if(onDeselect != null) onDeselect(gameObject);
}

public override void OnDrop (PointerEventData eventData){
if(onDrop != null) onDrop(gameObject);
}

public override void OnEndDrag (PointerEventData eventData){
if(onEndDrag != null) onEndDrag(gameObject);
}

public override void OnInitializePotentialDrag (PointerEventData eventData){
if(onInitializePotentialDrag != null) onInitializePotentialDrag(gameObject);
}

public override void OnMove (AxisEventData eventData){
if(onMove != null) onMove(gameObject);
}

public override void OnScroll (PointerEventData eventData){
if(onScroll != null) onScroll(gameObject);
}

public override void OnSubmit (BaseEventData eventData){
if(onSubmit != null) onSubmit(gameObject);
}

}