How we can disable the close [X] button in the top right corner of GUI?

[Gojir4]

@Mijaz

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setWindowsFlags(Qt::WindowCloseButtonHint, false);
}

[Mijaz]

@Gojir4
Hi,
I am using qt4.8.7.
your suggested command not working.

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
   setWindowFlags(Qt::WindowCloseButtonHint, false);
    timerId = startTimer(1000);
}
MainWindow::~MainWindow()
{
    killTimer(timerId);
    delete ui;
}
void MainWindow::timerEvent(QTimerEvent *event)
{
    qDebug() << "Update...";
    ui->lineEdit->setText("test  ");
}

[jsulm]

@Mijaz Please read documentation: https://doc.qt.io/qt-5/qwidget.html#windowFlags-prop

setWindowFlags(windowFlags() & ~Qt::WindowCloseButtonHint);

[J.Hilk]

@Mijaz said in

button in the top right corner of GUI?

:

I am using qt4.8.7.

Important information, that one should state in the opening post.

besides that, looking into the Qt4 Documentation shows the following:
https://doc.qt.io/archives/qt-4.8/qwidget.html#windowFlags-prop
with an actual example on how top use it:
https://doc.qt.io/archives/qt-4.8/qt-widgets-windowflags-example.html

->

setWindowFlags(windowFlags()  & ~Qt::WindowCloseButtonHint); 

[Mijaz]

@Gojir4
Now this is working

{
    ui->setupUi(this);

    timerId = startTimer(1000);
    this->setWindowFlags(Qt::WindowMaximizeButtonHint);
}

[J.Hilk]

@Mijaz great
just a warning, since you're on linux. Not every WindowManager will support the individual showing/hiding of Window-Buttons

[jsulm]

@Mijaz said in

button in the top right corner of GUI?

:

this->setWindowFlags(Qt::WindowMaximizeButtonHint);

Keep in mind that this way you disable all other flags. But as long as this is fine for you you can do it this way.

[Mijaz]

@J-Hilk
yes, When I deploy it to the board then it still showing the close mark.

How I can remove this permanently?

[J.Hilk]

@Mijaz change the window manager on the board...

Here a guide, on how to do it on GNOME, should be similar for all Linux flavors
https://linuxcommando.blogspot.com/2014/07/how-to-change-window-manager-for-gnome.html

[Mijaz]

@J-Hilk
Now I have removed the title bar. and its working on board also.

    setWindowFlags(Qt::Dialog | Qt::FramelessWindowHint | Qt::WindowTitleHint);