Button.qml Example File

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 import Qt 4.7

 Item {
     property alias image: icon.source
     property variant action

     signal clicked

     width: 40; height: parent.height

     Image {
         id: icon; anchors.centerIn: parent
         opacity: if (action != undefined) { action.enabled ? 1.0 : 0.4 } else 1
     }

     MouseArea {
         anchors { fill: parent; topMargin: -10; bottomMargin: -10 }
         onClicked: {
             if (action != undefined)
                 action.trigger()
             parent.clicked()
         }
     }
 }