How to hide titlebar of the QDialog window? [duplicate]

问题

This question already has answers here:

QDialog remove title bar (3 answers)

Closed last month.

I show a dialog in my qt application on menu action click window is appearing perfectly but I want to hide its title bar as it is just a sub-window inside main window.

I tried :

this->setWindowFlags(Qt::Window |Qt::FramelessWindowHint);

In dialog constructor:

ui->setupUi(this);
this->setWindowState (Qt::WindowActive);
setWindowModality(Qt::ApplicationModal);
setAttribute (Qt::WA_DeleteOnClose);
this->setWindowFlags(Qt::Window |Qt::FramelessWindowHint) ; // 

This does remove the title bar but it also hides the main window, which is bad for my application.

How can I hide dialog title bar without disturbing the base main window of the application?

回答1:

 QDialog *dialog(new QDialog /* this should be your dialog class youve created obviously*/));
 dialog->setWindowFlags(Qt::FramelessWindowHint | Qt::Dialog);
 dialog->show();

回答2:

You're missing the CustomizeWindowHint.

As you can see from the source code here (line 1035) for QWidget, it decides what to do depending upon that flag. So I suggest trying this: -

setWindowFlags(Qt::Window | Qt::CustomizeWindowHint); 

来源：https://stackoverflow.com/questions/26015880/how-to-hide-titlebar-of-the-qdialog-window