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using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
[RequireComponent(typeof(Image))]
public class Dragable : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler, IPointerClickHandler
{
protected RectTransform m_DraggingPlane;
private float lastClickTime = -1;
public virtual void OnBeginDrag(PointerEventData eventData)
{
var canvas = FindInParents<Canvas>(gameObject);
if (canvas == null)
return;
m_DraggingPlane = canvas.transform as RectTransform;
transform.SetParent(m_DraggingPlane,false);
SetDraggedPosition(eventData);
}
public virtual void OnDrag(PointerEventData data)
{
SetDraggedPosition(data);
}
protected virtual void SetDraggedPosition(PointerEventData data)
{
var rt = transform as RectTransform;
Vector3 globalMousePos;
if (RectTransformUtility.ScreenPointToWorldPointInRectangle(m_DraggingPlane, data.position, data.pressEventCamera, out globalMousePos))
{
rt.position = globalMousePos;
rt.rotation = m_DraggingPlane.rotation;
}
}
public virtual void OnEndDrag(PointerEventData eventData)
{
}
static public T FindInParents<T>(GameObject go) where T : Component
{
if (go == null) return null;
var comp = go.GetComponent<T>();
if (comp != null)
return comp;
Transform t = go.transform.parent;
while (t != null && comp == null)
{
comp = t.gameObject.GetComponent<T>();
t = t.parent;
}
return comp;
}
public void OnPointerClick(PointerEventData eventData)
{
if (Time.time - lastClickTime <= 0.5f)
OnDoubleClick();
lastClickTime = Time.time;
}
protected virtual void OnDoubleClick() { }
}