main.qml Example File

heartrate-game/qml/main.qml
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 import QtQuick 2.7
 import QtQuick.Window 2.2
 import "."

 Window {
     id: wroot
     visible: true
     width: 720 * .7
     height: 1240 * .7
     title: qsTr("HeartRateGame")
     color: GameSettings.backgroundColor

     Component.onCompleted: {
         GameSettings.wWidth = Qt.binding(function() {return width})
         GameSettings.wHeight = Qt.binding(function() {return height})
     }

     Loader {
         id: splashLoader
         anchors.fill: parent
         source: "SplashScreen.qml"
         asynchronous: false
         visible: true

         onStatusChanged: {
             if (status === Loader.Ready) {
                 appLoader.setSource("App.qml");
             }
         }
     }

     Connections {
         target: splashLoader.item
         onReadyToGo: {
             appLoader.visible = true
             appLoader.item.init()
             splashLoader.visible = false
             splashLoader.setSource("")
             appLoader.item.forceActiveFocus();
         }
     }

     Loader {
         id: appLoader
         anchors.fill: parent
         visible: false
         asynchronous: true
         onStatusChanged: {
             if (status === Loader.Ready)
                 splashLoader.item.appReady()
             if (status === Loader.Error)
                 splashLoader.item.errorInLoadingApp();
         }
     }
 }