How to disable the parent form when a child form is active?

[Sushant21]

In C# or VB.net, you wud achieve it by ShowDialog , which means you cannot interact with the parent form until child form closes.

How to achieve same in qt ?

[mrjj]

Hi and welcome

Its called a modal dialog and its activated by calling exec() and not show()

Mydialog dialog;;
dialog.exec(); // local event loop and blocking.

If Widget is not QDialog, you can read about
setWindowModality(Qt::ApplicationModal);
http://doc.qt.io/qt-5/qwidget.html#windowModality-prop

to get such effect.

[Sushant21]

@mrjj Thank You !!
that did the trick...