ConnectButton.qml Example File

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 import QtQuick 1.0
 import QtMobility.connectivity 1.2

 Image {
     id: connectButton

     property bool enabled: true
     property int roRotation
     property BluetoothDiscoveryModel mymodel
     property BluetoothSocket socket
     property BluetoothSocket server_socket

     source: "icons/connect.png"
     width: 100
     height: 100
     x: 440
     y: 220
     smooth: true
     opacity: 1.0

     NumberAnimation {
         id: connectRotation

         target:  connectButton
         property: "rotation"
         from: 0
         to: 360
         loops: -1
         duration: 1000
         running: mymodel.discovery

         onRunningChanged: if(!running) { connectStop.running = true; }

     }

     NumberAnimation {
         id: connectStop

         target: connectButton
         property: "rotation"
         loops: 1
         from: connectButton.roRotation
         to: 0
         duration: 1000*connectButton.roRotation/360
         running: false
     }

     onRotationChanged: if(!connectStop.running) roRotation = rotation;

     MouseArea {
         anchors.fill: connectButton
         enabled: connectButton.state != "disabled"
         hoverEnabled: true
         onClicked: {
             mymodel.discovery = !mymodel.discovery;
         }
     }

     states: [
         State {
             name: "disabled"
             when: socket.connected || server_socket.connected
             PropertyChanges { target: connectButton; opacity: 0.0; }
         }
     ]

     transitions: [
         Transition {
             from: "*"
             to: "disabled"
             reversible: true
             NumberAnimation { target: connectButton; property: "opacity"; duration: 750 }
         }
     ]

 }