Bluetooth QML Ping Pong example

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 import QtQuick 2.0
 import QtQuick.Window 2.1

 Rectangle {
     id: board
     width: 600
     height: 300

     // 1 - server role; left pedal
     // 2 - client role; right pedal
     property int roleSide: pingPong.role
     onRoleSideChanged: {
         if (pingPong.role == 1) {
             rightMouse.opacity = 0.7
             rightMouse.enabled = false
         }
         else if (pingPong.role == 2) {
             leftMouse.opacity = 0.7
             leftMouse.enabled = false
         }
     }

     property bool deviceMessage: pingPong.showDialog
     onDeviceMessageChanged: {
         if (pingPong.showDialog) {
             info.visible = true;
             board.opacity = 0.5;
         } else {
             info.visible = false;
             board.opacity = 1;
         }
     }

     // Left pedal - server role
     Rectangle {
         id: leftblock
         y: (parent.height/2)
         width: (parent.width/27)
         height: (parent.height/5)
         anchors.left: parent.left
         color: "#363636"
         radius: 10

         MouseArea {
             id: leftMouse
             anchors.fill: parent
             acceptedButtons: Qt.LeftButton
             drag.target: leftblock
             drag.axis: Drag.YAxis
             drag.minimumY: 0
             drag.maximumY: (board.height - leftblock.height)
         }
     }

     // Right pedal - client role
     Rectangle {
         id: rightblock
         y: (parent.height/2)
         width: (parent.width/27)
         height: (parent.height/5)
         anchors.right: parent.right
         color: "#363636"
         radius: 10

         MouseArea {
             id: rightMouse
             anchors.fill: parent
             acceptedButtons: Qt.LeftButton
             drag.target: rightblock
             drag.axis: Drag.YAxis
             drag.minimumY: 0
             drag.maximumY: (board.height - rightblock.height)
         }
     }

     property double leftBlockY: leftblock.y
     onLeftBlockYChanged: pingPong.updateLeftBlock(leftblock.y)

     property double leftBlockUpdate: pingPong.leftBlockY
     onLeftBlockUpdateChanged: leftblock.y = pingPong.leftBlockY

     property double rightBlockY: rightblock.y
     onRightBlockYChanged: pingPong.updateRightBlock(rightblock.y)

     property double rightBlockUpdate: pingPong.rightBlockY
     onRightBlockUpdateChanged: rightblock.y = pingPong.rightBlockY

     Rectangle {
         id: splitter
         color: "#363636"
         anchors.horizontalCenter: parent.horizontalCenter
         height: parent.height
         width: parent.width/100
     }

     Text {
         id: leftResult
         text: pingPong.leftResult
         font.bold: true
         font.pixelSize: 30
         anchors.right: splitter.left
         anchors.top: parent.top
         anchors.margins: 15
     }

     Text {
         id: rightResult
         text: pingPong.rightResult
         font.bold: true
         font.pixelSize: 30
         anchors.left: splitter.right
         anchors.top: parent.top
         anchors.margins: 15
     }

     Rectangle {
         id: ball
         width: leftblock.width/2
         height: leftblock.width/2
         radius: width
         color: "#363636"
         x: pingPong.ballX
         y: pingPong.ballY

         SequentialAnimation {
             running: true
             NumberAnimation { target: ball; property: "x"; duration: 50 }
             NumberAnimation { target: ball; property: "y"; duration: 50 }
         }
     }

     Component.onCompleted: {
         if (menulist.height == Screen.height && menulist.width == Screen.width)
             pingPong.setSize(Screen.width, Screen.height)
         else
             pingPong.setSize(board.width, board.height)
         pingPong.updateLeftBlock(leftblock.y)
         pingPong.updateRightBlock(rightblock.y)
     }
 }