QDialog remove title bar

Question

The net is flooded with similar questions, but for all I have seen nothing suits to solve the problem at hand.

In my QT-C++ app, I have a mainwindow form with some functions, there is a QPushButton, Pressing which a QDialog opens. Now, all functionalities in forms work fine, but I want the final application to be without any top title bar. i.e. No Close / Minimize / Maximize Button.

In my main.cpp I have done --

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.setWindowFlags(Qt::Window | Qt::FramelessWindowHint);
    w.show();
    return a.exec();
}

as a result the mainwindow has become -

For the dialog.cpp window, I have set -

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
    //QDialog Dialog(0, Qt::CustomizeWindowHint|Qt::WindowTitleHint);  --- used this also; no use

    QDialog Dialog(0, Qt::FramelessWindowHint | Qt::Dialog);

But the title bar of QDialog remains, it looks like -

Where am I going wrong ??? any ideas on how to remove the close button and the title bar ???

Bury

Possible duplicate of How to hide titlebar of the QDialog window? – Phenformin

Answer 1

Solved it with help from a friend, posting the answer for ready reference for someone in need ---

in the mainwindow.cpp when the Fetch button is pressed, the qdialog opens, I have set the properties there;

void MainWindow::on_pushButton_2_clicked()
{
    Dialog dialog;
    dialog.setModal(true);
    dialog.setWindowFlags(Qt::FramelessWindowHint);
    dialog.exec();
}

This did the trick --

and the dialog --

Bury

nice it helped me solve a very different problem. Thanks :) – Unite

The problem with this solution is that it won't allow you to move or resize the dialog, in case if you want to. I understand it's a dialog so maybe resizing won't be necessary, but moving it around the screen is important. But maybe it behaves differently on Mac. I'm talking about Windows. – Kephart

Answer 2

I needed to do the same thing as this question for dialogs but I wanted a border on the dialog without the window bar. The solution was actually quite simple. Just set the dialog's flags to Qt::CustomizeWindowHint:

dialog.setWindowFlags(Qt::CustomizeWindowHint);

You can also OR this with specific flags to further customize the windows appearance as noted in the documentation.

Rumanian

After this setting, the window cannot be dragged, how to realize dragging the window by pressing the left button of the mouse on the blank area ? – Lindblad

Answer 3

I have had some problems with setting Qt::FramelessWindowHint flag, so I ended up with overriding resizeEvent instead of setting this flag:

void  MyDialog::resizeEvent(QResizeEvent*)
{
    this->setMask(QRegion(this->rect()));
}

Margaux

how did you call this function ? – Flourishing

Answer 4

Dialog->setWindowFlags(Qt::FramelessWindowHint | Qt::Dialog);

Homoio

this isn't a great answer, it would help if you fleshed it out. see stackoverflow.com/help/how-to-answer – Bismarck