1 files changed, 48 insertions, 0 deletions
diff --git a/Assets/SampleUI/Scripts/DragPanel.cs b/Assets/SampleUI/Scripts/DragPanel.cs
new file mode 100755
index 0000000..39c9e10
--- /dev/null
+++ b/Assets/SampleUI/Scripts/DragPanel.cs
@@ -0,0 +1,48 @@
+using UnityEngine;
+using UnityEngine.UI;
+using UnityEngine.EventSystems;
+using System.Collections;
+
+public class DragPanel : MonoBehaviour, IPointerDownHandler, IDragHandler {
+	
+	private Vector2 originalLocalPointerPosition;
+	private Vector3 originalPanelLocalPosition;
+	private RectTransform panelRectTransform;
+	private RectTransform parentRectTransform;
+	
+	void Awake () {
+		panelRectTransform = transform.parent as RectTransform;
+		parentRectTransform = panelRectTransform.parent as RectTransform;
+	}
+	
+	public void OnPointerDown (PointerEventData data) {
+		originalPanelLocalPosition = panelRectTransform.localPosition;
+		RectTransformUtility.ScreenPointToLocalPointInRectangle (parentRectTransform, data.position, data.pressEventCamera, out originalLocalPointerPosition);
+	}
+	
+	public void OnDrag (PointerEventData data) {
+		if (panelRectTransform == null || parentRectTransform == null)
+			return;
+		
+		Vector2 localPointerPosition;
+		if (RectTransformUtility.ScreenPointToLocalPointInRectangle (parentRectTransform, data.position, data.pressEventCamera, out localPointerPosition)) {
+			Vector3 offsetToOriginal = localPointerPosition - originalLocalPointerPosition;
+			panelRectTransform.localPosition = originalPanelLocalPosition + offsetToOriginal;
+		}
+		
+		ClampToWindow ();
+	}
+	
+	// Clamp panel to area of parent
+	void ClampToWindow () {
+		Vector3 pos = panelRectTransform.localPosition;
+		
+		Vector3 minPosition = parentRectTransform.rect.min - panelRectTransform.rect.min;
+		Vector3 maxPosition = parentRectTransform.rect.max - panelRectTransform.rect.max;
+		
+		pos.x = Mathf.Clamp (panelRectTransform.localPosition.x, minPosition.x, maxPosition.x);
+		pos.y = Mathf.Clamp (panelRectTransform.localPosition.y, minPosition.y, maxPosition.y);
+		
+		panelRectTransform.localPosition = pos;
+	}
+}