battery-subscriber.qml Example File

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 import Qt 4.7
 import QtMobility.publishsubscribe 1.1
 import Qt.labs.particles 1.0
 import "content"

 Rectangle {
     color: "white"
     width: 100
     height: 230

     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: "content/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]
 }