From fefe28b8b34f77c7258aeec25d9a8ec4356084b1 Mon Sep 17 00:00:00 2001
From: ReiiYuki <voraton.l@ku.th>
Date: Fri, 23 Jun 2017 17:16:47 +0900
Subject: [PATCH] Handle Disappear Event

---
 Assets/Example/Scripts/HandPositionHandler.cs | 20 ++++++++++
 .../IRToolkit/Scripts/HandPositionManager.cs  | 37 +++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/Assets/Example/Scripts/HandPositionHandler.cs b/Assets/Example/Scripts/HandPositionHandler.cs
index d53447b..7d84e55 100644
--- a/Assets/Example/Scripts/HandPositionHandler.cs
+++ b/Assets/Example/Scripts/HandPositionHandler.cs
@@ -21,4 +21,24 @@ void OnRightHandChange(Vector3 handPosition)
         rightCursor.transform.position = Camera.main.transform.position + new Vector3(handPosition.x * 100, handPosition.y * 100, handPosition.z * 100) + Camera.main.transform.forward;
     }
 
+    void OnLeftHandAppear()
+    {
+        leftCursor.SetActive(true);
+    }
+
+    void OnLeftHandDisappear()
+    {
+        leftCursor.SetActive(false);
+    }
+
+    void OnRightHandAppear()
+    {
+        rightCursor.SetActive(true);
+    }
+
+    void OnRightHandDisappear()
+    {
+        rightCursor.SetActive(false);
+    }
+
 }
diff --git a/Assets/IRToolkit/Scripts/HandPositionManager.cs b/Assets/IRToolkit/Scripts/HandPositionManager.cs
index 10edf0e..aeb7b47 100644
--- a/Assets/IRToolkit/Scripts/HandPositionManager.cs
+++ b/Assets/IRToolkit/Scripts/HandPositionManager.cs
@@ -5,7 +5,15 @@
 using Intel.RealSense;
 
 public class HandPositionManager : Publisher {
+    
+    enum State
+    {
+        Appear,
+        Lost
+    }
+
     HandManager handManager;
+    State leftHandState, rightHandState;
 
 	// Update is called once per frame
 	void Update () {
@@ -19,17 +27,46 @@ void UpdateHandPosition()
         if (GetComponent<DepthCameraManger>().isStart)
             if (handManager.handData != null)
             {
+                State isLeftAppear = State.Lost;
+                State isRightAppear = State.Lost;
                 for (int i = 0; i < handManager.handData.NumberOfHands; i++)
                 {
                     IHand hand;
                     if (handManager.handData.QueryHandData(AccessOrderType.ACCESS_ORDER_BY_TIME,i,out hand) == Status.STATUS_NO_ERROR)
                     {
                         if (hand.BodySide == BodySideType.BODY_SIDE_LEFT)
+                        {
                             Boardcast("OnLeftHandChange", new Vector3(hand.MassCenterWorld.x, hand.MassCenterWorld.y, hand.MassCenterWorld.z));
+                            isLeftAppear = State.Appear;
+                        }
                         else if (hand.BodySide == BodySideType.BODY_SIDE_RIGHT)
+                        {
                             Boardcast("OnRightHandChange", new Vector3(hand.MassCenterWorld.x, hand.MassCenterWorld.y, hand.MassCenterWorld.z));
+                            isRightAppear = State.Appear;
+                        }
                     }
                 }
+                CheckStateChange(isLeftAppear, isRightAppear);
             }
     }
+
+    void CheckStateChange(State isLeftHandAppear,State isRightHandAppear)
+    {
+        if (leftHandState != isLeftHandAppear)
+        {
+            if (isLeftHandAppear == State.Appear)
+                Boardcast("OnLeftHandAppear");
+            else
+                Boardcast("OnLeftHandDisappear");
+            leftHandState = isLeftHandAppear;
+        }
+        if (rightHandState != isRightHandAppear)
+        {
+            if (isRightHandAppear == State.Appear)
+                Boardcast("OnRightHandAppear");
+            else
+                Boardcast("OnRightHandDisappear");
+            rightHandState = isLeftHandAppear;
+        }
+    }
 }