QML中的消息弹窗和文件弹窗

import QtQuick
import QtQuick.Controls.Material    //Material要放在Dialogs的前面，否则会报错
import QtQuick.Controls
import QtQuick.Dialogs

Window {
    id: root
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    Column
    {
        padding: 20; spacing: 20

        Button
        {
            text: "MessageDialog"

            onClicked: dlg.open()
        }

        Button
        {
            text: "FileDialog"
            onClicked:
            {
                fileDlg.open()
            }
        }
    }

    FileDialog
    {
        id: fileDlg
        
        fileMode: FileDialog.OpenFile   //枚举，FileDialog.OpenFile、FileDialog.OpenFiles、FileDialog.SaveFile
        
        acceptLabel: "acceptLabel"  //替换掉系统文件窗口下的“打开(O)”的按钮的文本
        rejectLabel: "rejectLabel"  //替换掉系统文件窗口下的“取消”的按钮的文本

        onAccepted:
        {
            dlg.text = selectedFile
            dlg.open()
        }
    }

    MessageDialog
    {
        id: dlg

        title: "MessageDialog"
        text: "This is a MessageDialog."

        buttons: MessageDialog.SaveAll | MessageDialog.Cancel | MessageDialog.Ok | MessageDialog.Close

        onAccepted: print(text)
        onRejected: print("MessageDialog onRejected")
    }
}