PlanetButton.qml Example File

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  import QtQuick 2.0

  Rectangle {
      id: planetButton

      property alias text: planetText.text
      property alias source: planetImage.source
      property alias focusPlanet: planetImage.focusPlanet
      property Item planetSelector: parent.parent
      property int buttonSize: 70
      property int fontSize: 16

      width: buttonSize
      height: buttonSize
      color: "transparent"

      Image {
          id: planetImage
          anchors.fill: parent
          property int focusPlanet

          MouseArea {
              anchors.fill: parent
              hoverEnabled: true
              onClicked: { planetSelector.focusedPlanet = focusPlanet }
              onEntered: PropertyAnimation { target: planetText; property: "opacity"; to: 1 }
              onExited: PropertyAnimation {
                  target: planetText
                  property: "opacity"
                  to: {
                      if (planetText.text != "Solar System")
                         0
                      else
                         1
                  }
              }
          }
      }

      Text {
          id: planetText
          anchors.centerIn: parent
          font.family: "Helvetica"
          font.pixelSize: fontSize
          font.weight: Font.Light
          color: "white"
          opacity: {
              if (text == "Solar System")
                  opacity = 1
              else
                  opacity = 0
          }
      }
  }