Allow ResetButtons to be moved

CachePositions() was created to allow the buttonObject and effectTargets position caches to be updated from OnColliderEventPressEnter. This allows the host of the ResetButton to be moved at runtime. If the cache is not updated the objects would end up getting moved to their start position in the scene after a button press. This is a fix for issue ViveSoftware#114.

Assets/HTC.UnityPlugin/ViveInputUtility/Examples/5.ColliderEvent/Scripts/ResetButton.cs

@@ -1,4 +1,6 @@
-using HTC.UnityPlugin.ColliderEvent;
+//========= Copyright 2016-2018, HTC Corporation. All rights reserved. ===========
+
+using HTC.UnityPlugin.ColliderEvent;
 using HTC.UnityPlugin.Utility;
 using System.Collections.Generic;
 using UnityEngine;
@@ -39,6 +41,13 @@ public ColliderButtonEventData.InputButton activeButton
     }
 
     private void Start()
+    {
+        CachePositions();
+    }
+
+    // Cache the positions of the effectTargets and of the buttonObject so they can be restored
+    // in OnColliderEventPressUp and OnColliderEventPressExit
+    private void CachePositions()
     {
         resetPoses = new RigidPose[effectTargets.Length];
         for (int i = 0; i < effectTargets.Length; ++i)
@@ -48,6 +57,7 @@ private void Start()
 
         buttonOriginPosition = buttonObject.position;
     }
+
 #if UNITY_EDITOR
     protected virtual void OnValidate()
     {
@@ -81,6 +91,7 @@ public void OnColliderEventPressEnter(ColliderButtonEventData eventData)
     {
         if (eventData.button == m_activeButton && pressingEvents.Add(eventData) && pressingEvents.Count == 1)
         {
+            CachePositions();
             buttonObject.position = buttonOriginPosition + buttonDownDisplacement;
         }
     }