| eventData | The values used when the drag is started. |
Handling for when the content is being dragged.
The handle is selected when the drag is started.
// Enable the selection of a ScrollView which can be dragged. // This script only chooses the ScrollView child of the Canvas.
using UnityEngine; using UnityEngine.EventSystems; using UnityEngine.UI;
public class ExampleScript : MonoBehaviour, IBeginDragHandler { private GameObject m_DraggingIcon;
public void Start() { m_DraggingIcon = new GameObject("icon"); }
public void OnBeginDrag(PointerEventData data) { Debug.Log("OnBeginDrag");
var canvas = FindInParents<Canvas>(gameObject); if (canvas == null) return;
m_DraggingIcon.transform.SetParent(canvas.transform, false); m_DraggingIcon.transform.SetAsLastSibling();
Debug.Log("Dragging started"); }
// locate and return the Canvas 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; } }
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