彥霖 實驗筆記

 


// 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.Generic;

public class MyButton2 : MonoBehaviour {

    public Sprite img;

    void Awake (){

        GameObject g = new GameObject ("My Button", typeof(Image), typeof(EventTrigger));

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

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

        // ------------------------------- OnDrag

        EventTrigger.Entry entry = new EventTrigger.Entry();
        entry.eventID = EventTriggerType.Drag;
        entry.callback = new EventTrigger.TriggerEvent();
        entry.callback.AddListener(new UnityAction<BaseEventData>(OnDrag));

        // ------------------------------- OnBeginDrag

        EventTrigger.Entry entry2 = new EventTrigger.Entry();
        entry2.eventID = EventTriggerType.BeginDrag;
        entry2.callback = new EventTrigger.TriggerEvent();
        entry2.callback.AddListener(new UnityAction<BaseEventData>(OnBeginDrag));

        // ------------------------------- OnEndDrag

        EventTrigger.Entry entry3 = new EventTrigger.Entry();
        entry3.eventID = EventTriggerType.EndDrag;
        entry3.callback = new EventTrigger.TriggerEvent();
        entry3.callback.AddListener(new UnityAction<BaseEventData>(OnEndDrag));

        // -------------------------------

        EventTrigger trigger = g.GetComponent<EventTrigger>();
        trigger.delegates = new List<EventTrigger.Entry>();
        trigger.delegates.Add(entry);
        trigger.delegates.Add(entry2);
        trigger.delegates.Add(entry3);
    }

    public void OnDrag(BaseEventData data){
        PointerEventData p = (PointerEventData)data;
        print(p.delta);
    }

    public void OnBeginDrag (BaseEventData eventData){
        print ("--------------- Begin Drag");
    }

    public void OnEndDrag (BaseEventData eventData){
        print ("--------------- End Drag");
    }

}