1. qml显示全屏

import QtQuick 2.12

import QtQuick.Window 2.12

Window {

    visible: true

    y:10

    width: fullScreen ? 640 : Screen.desktopAvailableWidth

    height: fullScreen ? 480 : Screen.desktopAvailableHeight

    title: qsTr("Hello World")

    property bool fullScreen: true

    flags: fullScreen ? Qt.Window : Qt.FramelessWindowHint

    MouseArea{

        anchors.fill: parent

        onClicked: {

            fullScreen = !fullScreen

        }

    }

}