qml button particles

ui.qml

import QtQuick 2.0
import QtQuick.Particles 2.0
import QtQuick.Window 2.0
import QtQuick.Controls 1.2

Window
{
	visible: true

	Rectangle
	{
		id: root
		anchors.fill: parent
		color: "#1f1f1f"

		ParticleSystem
		{
			id: particleSystem

			Gravity
			{
				anchors.fill: parent
				angle: 0
				magnitude: 100
			}

		}

		Emitter
		{
			id: emitter
			width: parent.width*.9
			height: 10
			anchors.bottom: parent.bottom
			anchors.horizontalCenter: parent.horizontalCenter
			system: particleSystem
			emitRate: 2
			lifeSpan: 5000
			velocity: AngleDirection
			{
				angle: 270
				angleVariation: 45
				magnitude: 200
			}
		}

		ItemParticle
		{
			delegate: Button
			{
				text: "Quit"
				rotation: Math.random()*360
				onClicked:
				{
					Qt.quit();
				}
			}
			system: particleSystem
		}
	}
}