Updated ColorSampler and TiltWindow with multi-touch support.

Also resolved an annoying warning from the BoxSlider (Resolves #234)

Scripts/Controls/BoxSlider.cs

@@ -137,7 +137,7 @@ namespace UnityEngine.UI.Extensions
             SetX(m_ValueX, false);
             SetY(m_ValueY, false);
             // Update rects since other things might affect them even if value didn't change.
-            UpdateVisuals();
+            if(!Application.isPlaying) UpdateVisuals();
 
             var prefabType = UnityEditor.PrefabUtility.GetPrefabType(this);
             if (prefabType != UnityEditor.PrefabType.Prefab && !Application.isPlaying)

Scripts/Controls/ColorPicker/ColorSampler.cs

@@ -1,3 +1,9 @@
+/// Credit judah4
+/// Sourced from - http://forum.unity3d.com/threads/color-picker.267043/
+/// Updated by SimonDarksideJ - Updated to use touch position rather than mouse for multi-touch
+
+using UnityEngine.EventSystems;
+
 namespace UnityEngine.UI.Extensions.ColorPicker
 {
 	/// <summary>
@@ -8,10 +14,13 @@ namespace UnityEngine.UI.Extensions.ColorPicker
 	/// 
 	/// This does not work well with a world space UI as positioning is working with screen space.
 	/// </summary>
-	public class ColorSampler : MonoBehaviour
+	public class ColorSampler : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IDragHandler
     {
+        private Vector2 m_screenPos;
+
         [SerializeField]
 		protected Button sampler;
+        private RectTransform sampleRectTransform;
 
 		[SerializeField]
 		protected Outline samplerOutline;
@@ -25,6 +34,7 @@ namespace UnityEngine.UI.Extensions.ColorPicker
 		protected virtual void OnEnable()
 		{
 			screenCapture = ScreenCapture.CaptureScreenshotAsTexture();
+            sampleRectTransform = sampler.GetComponent<RectTransform>();
             sampler.gameObject.SetActive(true);
 			sampler.onClick.AddListener(SelectColor);
 		}
@@ -41,8 +51,8 @@ namespace UnityEngine.UI.Extensions.ColorPicker
 			if (screenCapture == null)
 				return;
 
-			sampler.transform.position = Input.mousePosition;
+            sampleRectTransform.position = m_screenPos;
-			color = screenCapture.GetPixel((int)Input.mousePosition.x, (int)Input.mousePosition.y);
+            color = screenCapture.GetPixel((int)m_screenPos.x, (int)m_screenPos.y);
 		
 			HandleSamplerColoring();
 		}
@@ -66,5 +76,20 @@ namespace UnityEngine.UI.Extensions.ColorPicker
 
 			enabled = false;
 		}
+
+        public void OnPointerDown(PointerEventData eventData)
+        {
+            m_screenPos = eventData.position;
+        }
+
+        public void OnPointerUp(PointerEventData eventData)
+        {
+            m_screenPos = Vector2.zero;
+        }
+
+        public void OnDrag(PointerEventData eventData)
+        {
+            m_screenPos = eventData.position;
+        }
     }
 }

Scripts/Controls/ColorPicker/TiltWindow.cs

@@ -1,16 +1,19 @@
 ///Credit judah4
 ///Sourced from - http://forum.unity3d.com/threads/color-picker.267043/
 
+using UnityEngine.EventSystems;
 
 namespace UnityEngine.UI.Extensions
 {
-    public class TiltWindow : MonoBehaviour
+    public class TiltWindow : MonoBehaviour, IDragHandler
     {
         public Vector2 range = new Vector2(5f, 3f);
 
-	Transform mTrans;
+        private Transform mTrans;
-	Quaternion mStart;
+        private Quaternion mStart;
-	Vector2 mRot = Vector2.zero;
+        private Vector2 mRot = Vector2.zero;
+        private Vector2 m_screenPos;
+
 
         void Start()
         {
@@ -20,7 +23,7 @@ namespace UnityEngine.UI.Extensions
 
         void Update()
         {
-		Vector3 pos = Input.mousePosition;
+            Vector3 pos = m_screenPos;
 
             float halfWidth = Screen.width * 0.5f;
             float halfHeight = Screen.height * 0.5f;
@@ -30,5 +33,11 @@ namespace UnityEngine.UI.Extensions
 
             mTrans.localRotation = mStart * Quaternion.Euler(-mRot.y * range.y, mRot.x * range.x, 0f);
         }
+
+
+        public void OnDrag(PointerEventData eventData)
+        {
+            m_screenPos = eventData.position;
+        }
     }
 }

Scripts/Utilities/UIExtensionMethods.cs

@@ -22,5 +22,44 @@ namespace UnityEngine.UI.Extensions
             return parentCanvas;
         }
 
+        public static Vector2 TransformInputBasedOnCanvasType(this Vector2 input, Canvas canvas)
+        {
+            if (canvas.renderMode == RenderMode.ScreenSpaceOverlay)
+            {
+                return canvas.GetEventCamera().ScreenToWorldPoint(input);
+            }
+            else
+            {
+                return input;
+            }
+        }
+
+        public static Vector3 TransformInputBasedOnCanvasType(this Vector2 input, RectTransform rt)
+        {
+            var canvas = rt.GetParentCanvas();
+            if (input == Vector2.zero || canvas.renderMode == RenderMode.ScreenSpaceOverlay)
+            {
+                return input;
+            }
+            else
+            {
+                // Needs work :S
+                Vector2 movePos;
+
+                RectTransformUtility.ScreenPointToLocalPointInRectangle(
+                    rt,
+                    input, canvas.GetEventCamera(),
+                    out movePos);
+
+                Vector3 output = canvas.transform.TransformPoint(movePos);
+                return output;
+            }
+        }
+
+        public static Camera GetEventCamera(this Canvas input)
+        {
+            return input.worldCamera == null ? Camera.main : input.worldCamera;
+
+        }
     }
 }