diff -r 1c2a7f563019 -r cf5eba52cb1d MiniDisplay/minidisplay.cpp
--- a/MiniDisplay/minidisplay.cpp	Wed Jun 04 08:12:37 2014 +0200
+++ b/MiniDisplay/minidisplay.cpp	Wed Jun 04 18:30:37 2014 +0200
@@ -5,7 +5,12 @@
 const int KMaxReadAttempt=100;
 
 MiniDisplay::MiniDisplay(QQuickItem *parent):
-    QQuickItem(parent),iReadAttempt(0),iBrightness(iDisplay.MaxBrightness())
+    QQuickItem(parent),
+    iReadAttempt(0),
+    iBrightness(iDisplay.MaxBrightness()),
+    iAfterAnimatingCallback(NULL),
+    iWindow(NULL),
+    iFrameCount(0)
 {
     // By default, QQuickItem does not draw anything. If you subclass
     // QQuickItem to create a visual item, you will need to uncomment the
@@ -53,6 +58,7 @@
         }
     }
     iDisplay.Close();
+    disconnectRenderLoop();
     emit closed();
     emit statusChanged();
 }
@@ -201,10 +207,15 @@
 
 
 /**
- * @brief MiniDisplay::connectWindow
- * @param aWindow
+Connect to the render loop of the given window.
+This is achieved using the afterAnimating event.
+If any JavaScript callback is provided it will be called on every frame.
+
+@brief MiniDisplay::connectRenderLoop
+@param aWindow The window to connect to.
+@param aFunction An optional JavaScript callback function
  */
-void MiniDisplay::connectWindow(QQuickWindow* aWindow, QJSValue aFunction)
+void MiniDisplay::connectRenderLoop(QQuickWindow* aWindow, QJSValue aFunction)
 {
     QObject::connect(aWindow, SIGNAL(afterAnimating()),
                      this,  SLOT(onAfterAnimating()));
@@ -214,11 +225,28 @@
 }
 
 /**
- * @brief MiniDisplay::onAfterAnimating
- */
+
+@brief MiniDisplay::disconnectRenderLoop
+*/
+void MiniDisplay::disconnectRenderLoop()
+{
+    if (iWindow)
+    {
+        QObject::disconnect(iWindow, SIGNAL(afterAnimating()),this,  SLOT(onAfterAnimating()));
+        iWindow = NULL;
+        iAfterAnimatingCallback = NULL;
+        iFrameCount=0;
+    }
+
+}
+
+/**
+Once connected to a window render loop this is called on every frame.
+
+@brief MiniDisplay::onAfterAnimating
+*/
 void MiniDisplay::onAfterAnimating()
 {
-    static int frame=0;
     //qDebug() << frame << "MiniDisplay::onAfterAnimating";
     /*
     if (iAfterAnimatingCallback.isCallable())
@@ -235,11 +263,11 @@
     {
         if (iAfterAnimatingCallback.isCallable())
         {
-            iAfterAnimatingCallback.call(QJSValueList() << frame);
+            iAfterAnimatingCallback.call(QJSValueList() << iFrameCount);
         }
     }
 
-    frame++;
+    iFrameCount++;
 }