Button.qml Example File

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  import QtQuick 2.0

  Item {
      id: button
      property alias text: textItem.text
      property color color: "#eceeea"

      property bool operator: false
      property bool dimmable: false
      property bool dimmed: false

      width: 30
      height: 50

      Text {
          id: textItem
          font.pixelSize: 48
          wrapMode: Text.WordWrap
          lineHeight: 0.75
          color: (dimmable && dimmed) ? Qt.darker(button.color) : button.color
          Behavior on color { ColorAnimation { duration: 120; easing.type: Easing.OutElastic} }
          states: [
              State {
                  name: "pressed"
                  when: mouse.pressed && !dimmed
                  PropertyChanges {
                      target: textItem
                      color: Qt.lighter(button.color)
                  }
              }
          ]
      }

      MouseArea {
          id: mouse
          anchors.fill: parent
          anchors.margins: -5
          onClicked: {
              if (operator)
                  window.operatorPressed(parent.text)
              else
                  window.digitPressed(parent.text)
          }
      }

      function updateDimmed() {
          dimmed = window.isButtonDisabled(button.text)
      }

      Component.onCompleted: {
          numPad.buttonPressed.connect(updateDimmed)
          updateDimmed()
      }
  }