BubbleLevel.qml Example File

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 import QtQuick 1.0

 Image {
     id: bubbleLevel

     // Signaled when task switcher button is pressed
     signal minimizeApplication()

     // Signaled when correction angle is saved
     signal saveCorrectionAngle(variant angle)

     // These functions are used as Qt slots
     function handleRotation(deg) {
         horTube.rawangle = deg
     }

     function setCorrectionAngle(deg) {
         horTube.angleconstant = deg
     }

     // Used to show the task switcher button in Maemo targets
     property alias taskSwitcherVisible: taskSwitcher.visible

     anchors.fill: parent
     source: "images/board.png"
     smooth: true

     MouseArea {
         anchors.fill: parent
         onClicked: sign.frontSide = true
     }

     Button {
         id: taskSwitcher

         anchors {
             left: parent.left
             right: horTube.left
             verticalCenter: horTube.verticalCenter
             margins: (parent.width - (horTube.x + horTube.width)) / 4
         }

         height: width
         source: "images/taskswitcher.png"
         mouseAreaScale: 2
         onClicked: bubbleLevel.minimizeApplication()
         visible: false
     }

     Button {
         id: exitButton

         anchors {
             left: horTube.right
             right: parent.right
             verticalCenter: horTube.verticalCenter
             margins: (parent.width - (horTube.x + horTube.width)) / 4
         }

         height: width
         source: "images/exit.png"
         mouseAreaScale: 2
         onClicked: Qt.quit()
     }

     Tube {
         id: horTube

         property real rawangle: 0
         property real angleconstant: 0

         anchors.horizontalCenter: parent.horizontalCenter
         width: parent.width * 0.775; height: parent.height * 0.15625
         deg: rawangle - angleconstant
     }

     Flipable {
         id: sign

         property bool frontSide: true

         x: parent.width * 0.185; y: parent.height * 0.669
         width: parent.width * 0.63; height: parent.height * 0.258

         MouseArea {
             anchors.fill: parent
             onClicked: sign.frontSide = !sign.frontSide
             z: -1
         }

         transform: Rotation {

             origin.x: sign.width / 2; origin.y: sign.height / 2
             axis.x: 1; axis.y: 0; axis.z: 0
             angle: sign.frontSide ? 0 : 180

             Behavior on angle {
                 RotationAnimation {
                     direction: RotationAnimation.Clockwise
                     easing.type: Easing.InOutCubic; duration: 300
                 }
             }
         }

         front: Image {
             anchors.fill: parent
             source: "images/signwithtext.png"
             smooth: true
         }

         back: Image {
             anchors.fill: parent
             source: "images/signblank.png"
             smooth: true

             Text {
                 id: oldValue

                 anchors {
                     left: parent.left; leftMargin: parent.width * 0.10
                     right: saveButton.left; rightMargin: 10
                     verticalCenter: parent.verticalCenter
                 }

                 text: "Place the device on a level surface and tap Calibrate."
                 color: "#302020"
                 wrapMode: Text.WordWrap
                 font { bold: false; pixelSize: Math.min(parent.width, parent.height) * 0.19 }
             }

             Button {
                 id: saveButton

                 anchors {
                     right: parent.right; rightMargin: parent.width * 0.09
                     verticalCenter: parent.verticalCenter
                 }

                 width: parent.width * 0.25; height: parent.height * 0.65
                 border { width: 2; color: "#555555" }
                 radius: 10

                 onClicked: {
                     horTube.angleconstant = horTube.rawangle
                     saveCorrectionAngle(horTube.angleconstant)
                 }

                 gradient: Gradient {
                     GradientStop { position: 0.0; color: "#999999" }
                     GradientStop { position: 0.2; color: "#BBBBBB" }
                     GradientStop { position: 0.8; color: "#BBBBBB" }
                     GradientStop { position: 1.0; color: "#999999" }
                 }

                 Text {
                     anchors.centerIn: parent
                     color: "#302020"
                     text: "Calibrate"
                     font { bold: true; pixelSize: parent.width * 0.15 }
                     smooth: true
                 }
             }
         }
     }

     Button {
         anchors {
             left: sign.right
             right: parent.right
             verticalCenter: sign.verticalCenter
             margins: (parent.width - (sign.x + sign.width)) / 4
         }

         height: width
         source: "images/calibbutton.png"
         mouseAreaScale: 2
         smooth: true

         onClicked: sign.frontSide = !sign.frontSide
     }
 }