CODEWITHSUNDEEP
c++qtpyqt5
tobi
tobi

Reputation: 2002

How to prevent closing QMessageBox after clicking a button

I have 3 buttons on QMessageBox added by QMessageBox::addButton() method. Is it possible to prevent closing the message box if a button has been clicked? By default every button closes the window, but I don't want to do it for one button.

Upvotes: 7

Views: 3792

Answers (6)

ghcdr
ghcdr

Reputation: 1

On my experience, using button.disconnect() has worked in the way of preventing the dialog from closing but has had an impact on the widget layout, particularly on the button ordering in the UI.

Upvotes: 0

Aking
Aking

Reputation: 683

Thanks to @Albert's Answer, I found that this also possible in python:

messagebox = QMessageBox()
button = QPushButton("This button will not close anything")
messagebox.addButton(button, QMessageBox.ButtonRole.NoRole)
button.disconnect()

Upvotes: 0

Albert H
Albert H

Reputation: 1051

One interesting way to approach it that worked for me is to completely disconnect the signals for the target button created, and then re-add the intended functionality. This won't work for everyone, especially if the button isn't created this way and/or you still want to close the dialog correctly. (There might be a way to add it back and/or simulate the behavior with QDialog::accept, QDialog::reject, QDialog::done - haven't tried yet.)

Example:

QMessageBox *msgBox = new QMessageBox(this);
QAbstractButton *doNotCloseButton = msgBox->addButton(tr("This button will not close anything"), QMessageBox::ActionRole);
// Disconnect all events - this will prevent the button from closing the dialog
doNotCloseButton->disconnect();
connect(doNotCloseButton, &QAbstractButton::clicked, this, [=](){ doNotCloseButton->setText("See? Still open!"); });

Upvotes: 6

user1667040
user1667040

Reputation: 31

Just had the same problem but I wanted to add a checkbox and it kept closing the dialog on clicked even with the ButtonRole set to QMessageBox::ActionRole (tried others too). For this scenario I just called blockSignals(true) on the QCheckBox and now it allows check/uncheck behaviour without closing the dialog. Luckily QCheckBox works fine without signals but assume you want a signal from your button.

They should likely add a new role that doesn't close the dialog as it's a pain to derive a class for simple customizations.

Upvotes: 3

Balázs Édes
Balázs Édes

Reputation: 13807

I looked through the addButton() functions overloads, but there is no custom behavior for the buttons you add with this method. They will behave like the standard buttons on a messagebox should.

However if you want to create a fully customizable dialog, then your best option is to extend the QDialog class and use whatever controlls you like on it.

Upvotes: 2

Stefan Majewsky
Stefan Majewsky

Reputation: 5555

If you can get a pointer to the QMessageBox widget, you can try to install a QObject::eventFilter on it which filters the QEvent::Close.

Upvotes: 3

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