Qt Designer how to insert a QWidget into a form item(widget, frame ,etc)

[Ion]

Hi there, currently not looking to make a custom widget for this as it is only a layout class object. What I want to do is be able to create a pane/window or whatever i need so that I can place a QWidget class (that i created in code instead of on the form) inside so that I can adjust the positions etc on Qt Designer.

So need two bits of information, one what item in Qt designer should i use to allow me to place a QWidget inside it?

and two, how do i then insert my class object into this window/pane ?

Layout class constructor listed below:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    QPalette p(palette());
    p.setColor(QPalette::Background, Qt::lightGray);
    this->setAutoFillBackground(true);
    this->setPalette(p);
    this->resize(1000,500);
    this->setWindowTitle(QApplication::translate("toplevel", "CCTV"));
 
    mplayer_wrapper *wrapper = new mplayer_wrapper(this);
    label = new QLabel(this);
    Timer = new QTimer(this);
 
 
    button1 = new QPushButton("Stop State");
    button2 = new QPushButton("Start Stream");
    button3 = new QPushButton("Time");
    vlayout = new QVBoxLayout();
 
    vlayout->addWidget(wrapper);
    vlayout->addWidget(button1);
    vlayout->addWidget(button2);
    vlayout->addWidget(button3);
    vlayout->addWidget(label);
 
    ui->centralWidget->setLayout(vlayout);
 
    connect(button1, &QPushButton::clicked,wrapper,&mplayer_wrapper::stop_mplayer);
    connect(button2, &QPushButton::clicked,wrapper,&mplayer_wrapper::start_mplayer);
    //connect(button3, &QPushButton::clicked,this,   &MainWindow::show_time);
    connect(Timer,&QTimer::timeout,this,&MainWindow::show_time);
 
    //ui->widget->
 
    Timer->start();
 
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    QPalette p(palette());
    p.setColor(QPalette::Background, Qt::lightGray);
    this->setAutoFillBackground(true);
    this->setPalette(p);
    this->resize(1000,500);
    this->setWindowTitle(QApplication::translate("toplevel", "CCTV"));

    mplayer_wrapper *wrapper = new mplayer_wrapper(this);
    label = new QLabel(this);
    Timer = new QTimer(this);


    button1 = new QPushButton("Stop State");
    button2 = new QPushButton("Start Stream");
    button3 = new QPushButton("Time");
    vlayout = new QVBoxLayout();

    vlayout->addWidget(wrapper);
    vlayout->addWidget(button1);
    vlayout->addWidget(button2);
    vlayout->addWidget(button3);
    vlayout->addWidget(label);

    ui->centralWidget->setLayout(vlayout);

    connect(button1, &QPushButton::clicked,wrapper,&mplayer_wrapper::stop_mplayer);
    connect(button2, &QPushButton::clicked,wrapper,&mplayer_wrapper::start_mplayer);
    //connect(button3, &QPushButton::clicked,this,   &MainWindow::show_time);
    connect(Timer,&QTimer::timeout,this,&MainWindow::show_time);

    //ui->widget->

    Timer->start();

}

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Specifically in regards to this code I want to insert mplayer_wrappers object wrapper. 90% of this code I want to do on the designer as it's becoming a nightmare when the layout is alot more complicated.