import QtQuick 2.15
import QtQuick.Window 2.15

Window {
    id: topLevelWindow

    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    visibility: Window.FullScreen

    Rectangle {
        id: rect

        anchors.fill: parent
        color: "lightBlue"

        focus: true
        Keys.onPressed: {
            if (event.key === Qt.Key_Escape) {
                rect.color = "lightGreen"

                topLevelWindow.visibility = Window.Maximized
            }
        }
    }
}