import Qt 4.6

Rectangle {

    color: "white"

    Rectangle {

        x: 20

        y: 10

        width: 60

        height: 10

        color: "black"

    }

    Rectangle {

        x: 10

        y: 20

        width: 80

        height: 200

        color: "black"

    }

    Rectangle {

        //! [1]

        id: visualCharge

        x: 12

        y: 22 + 196 - height

        width: 76

        height: 196 * batteryCharge.value / 100

        clip: true

        color: "green"

        //! [1]

        Particles {

            id: bubbles

            width: parent.width

            anchors.bottom: parent.bottom

            source: "bubble.png"

            count: 0

            velocity: 30

            velocityDeviation: 10

            angle: -90

            //lifeSpan: parent.height * 1000 / (velocity + velocityDeviation / 2)

            lifeSpan: parent.height * 1000 / (30 + 10 / 2)

        }

        states: [

        //! [3]

        State {

            name: "charging"

            when: batteryCharging.value

            PropertyChanges {

                target: bubbles

                count: batteryCharge.value / 5

                emissionRate: 5

            }

        },

        //! [3]

        //! [2]

        State {

            name: "low"

            when: batteryCharge.value < 25 && !batteryCharging.value

            PropertyChanges {

                target: visualCharge

                color: "red"

            }

        }

        //! [2]

        ]

        transitions: [

        Transition {

            from: "*"

            to: "low"

            reversible: true

            ColorAnimation {

                duration: 200

            }

        }

        ]

    }

    //! [0]

    ValueSpaceSubscriber {

        id: batteryCharge

        path: "/power/battery/charge"

    }

    ValueSpaceSubscriber {

        id: batteryCharging

        path: "/power/battery/charging"

    }

    //! [0]

}