PressAndHoldButton.qml Example File

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 import QtQuick 1.0

 Image {
     id: container

     property int repeatDelay: 300
     property int repeatDuration: 75
     property bool pressed: false

     signal clicked

     scale: pressed ? 0.9 : 1

     function release() {
         autoRepeatClicks.stop()
         container.pressed = false
     }

     SequentialAnimation on pressed {
         id: autoRepeatClicks
         running: false

         PropertyAction { target: container; property: "pressed"; value: true }
         ScriptAction { script: container.clicked() }
         PauseAnimation { duration: repeatDelay }

         SequentialAnimation {
             loops: Animation.Infinite
             ScriptAction { script: container.clicked() }
             PauseAnimation { duration: repeatDuration }
         }
     }

     MouseArea {
         anchors.fill: parent

         onPressed: autoRepeatClicks.start()
         onReleased: container.release()
         onCanceled: container.release()
     }
 }