ToggleButton.qml Example File

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 import QtQuick 1.0

 /* A toggle button component. */
 Rectangle {
     id: toggleButton

     property url offImageSource: ""
     property url onImageSource: ""
     property alias imageSource: buttonImage.source

     signal selected()
     signal pushed()

     color: "transparent"
     state: "unPressed"
     onStateChanged: {
         if (state == "pressed") {
             selected()
         }
     }

     Image {
         id: buttonImage

         smooth: true
         anchors.fill: parent
     }
     MouseArea {
         id: mouseArea

         anchors.fill: parent
         onPressed: {
             if (parent.state == "unPressed") {
                 pushed()
             }
         }
     }

     states: [
         State {
             name: "pressed"
             PropertyChanges {
                 target: toggleButton
                 scale: 0.95
                 imageSource: onImageSource
             }
         },
         State {
             name: "unPressed"
             PropertyChanges {
                 target: toggleButton
                 scale: 1/0.95
                 imageSource: offImageSource
             }
         }
     ]

     transitions: [
         Transition {
             from: "unPressed"
             to: "pressed"
             reversible: true
             PropertyAnimation {
                 target: toggleButton
                 properties: "scale"
                 duration: 100
             }
         }
     ]
 }