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//![0]

import Qt 4.7

Item {

    id: toggleswitch

    width: background.width; height: background.height

//![1]

    property bool on: false

//![1]

//![2]

    function toggle() {

        if (toggleswitch.state == "on")

            toggleswitch.state = "off";

        else 

            toggleswitch.state = "on";

    }

//![2]

//![3]

    function releaseSwitch() {

        if (knob.x == 1) {

            if (toggleswitch.state == "off") return;

        }

        if (knob.x == 78) {

            if (toggleswitch.state == "on") return;

        }

        toggle();

    }

//![3]

//![4]

    Image {

        id: background

        source: "background.svg"

        MouseArea { anchors.fill: parent; onClicked: toggle() }

    }

//![4]

//![5]

    Image {

        id: knob

        x: 1; y: 2

        source: "knob.svg"

        MouseArea {

            anchors.fill: parent

            drag.target: knob; drag.axis: Drag.XAxis; drag.minimumX: 1; drag.maximumX: 78

            onClicked: toggle()

            onReleased: releaseSwitch()

        }

    }

//![5]

//![6]

    states: [

        State {

            name: "on"

            PropertyChanges { target: knob; x: 78 }

            PropertyChanges { target: toggleswitch; on: true }

        },

        State {

            name: "off"

            PropertyChanges { target: knob; x: 1 }

            PropertyChanges { target: toggleswitch; on: false }

        }

    ]

//![6]

//![7]

    transitions: Transition {

        NumberAnimation { properties: "x"; easing.type: Easing.InOutQuad; duration: 200 }

    }

//![7]

}

//![0]