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using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
[RequireComponent(typeof(Image))]
public class DragMe : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
public bool dragOnSurfaces = true;
private Dictionary<int,GameObject> m_DraggingIcons = new Dictionary<int, GameObject>();
private Dictionary<int, RectTransform> m_DraggingPlanes = new Dictionary<int, RectTransform>();
public void OnBeginDrag(PointerEventData eventData)
{
var canvas = FindInParents<Canvas>(gameObject);
if (canvas == null)
return;
// We have clicked something that can be dragged.
// What we want to do is create an icon for this.
m_DraggingIcons[eventData.pointerId] = new GameObject("icon");
m_DraggingIcons[eventData.pointerId].transform.SetParent (canvas.transform, false);
m_DraggingIcons[eventData.pointerId].transform.SetAsLastSibling();
var image = m_DraggingIcons[eventData.pointerId].AddComponent<Image>();
// The icon will be under the cursor.
// We want it to be ignored by the event system.
var group = m_DraggingIcons[eventData.pointerId].AddComponent<CanvasGroup>();
group.blocksRaycasts = false;
image.sprite = GetComponent<Image>().sprite;
image.SetNativeSize();
if (dragOnSurfaces)
m_DraggingPlanes[eventData.pointerId] = transform as RectTransform;
else
m_DraggingPlanes[eventData.pointerId] = canvas.transform as RectTransform;
SetDraggedPosition(eventData);
}
public void OnDrag(PointerEventData eventData)
{
if (m_DraggingIcons[eventData.pointerId] != null)
SetDraggedPosition(eventData);
}
private void SetDraggedPosition(PointerEventData eventData)
{
if (dragOnSurfaces && eventData.pointerEnter != null && eventData.pointerEnter.transform as RectTransform != null)
m_DraggingPlanes[eventData.pointerId] = eventData.pointerEnter.transform as RectTransform;
var rt = m_DraggingIcons[eventData.pointerId].GetComponent<RectTransform>();
Vector3 globalMousePos;
if (RectTransformUtility.ScreenPointToWorldPointInRectangle(m_DraggingPlanes[eventData.pointerId], eventData.position, eventData.pressEventCamera, out globalMousePos))
{
rt.position = globalMousePos;
rt.rotation = m_DraggingPlanes[eventData.pointerId].rotation;
}
}
public void OnEndDrag(PointerEventData eventData)
{
if (m_DraggingIcons[eventData.pointerId] != null)
Destroy(m_DraggingIcons[eventData.pointerId]);
m_DraggingIcons[eventData.pointerId] = null;
}
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;
var t = go.transform.parent;
while (t != null && comp == null)
{
comp = t.gameObject.GetComponent<T>();
t = t.parent;
}
return comp;
}
}
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