Getting Started Programming with Qt Quick

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 import QtQuick 2.11
 import QtQuick.Controls 2.4
 import QtQuick.Controls.Material 2.4
 import QtQuick.Layouts 1.11
 import QtQuick.Window 2.11
 import Qt.labs.calendar 1.0

 ApplicationWindow {
     id: window
     width: 400
     height: 500
     visible: true

     ListView {
         id: alarmListView
         anchors.fill: parent
         model: AlarmModel {}
         delegate: AlarmDelegate {}
     }

     RoundButton {
         id: addAlarmButton
         text: "+"
         anchors.bottom: alarmListView.bottom
         anchors.bottomMargin: 8
         anchors.horizontalCenter: parent.horizontalCenter
         onClicked: alarmDialog.open()
     }

     AlarmDialog {
         id: alarmDialog
         x: Math.round((parent.width - width) / 2)
         y: Math.round((parent.height - height) / 2)
         alarmModel: alarmListView.model
     }
 }