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qtqt4

How to delete an already existing layout on a widget?

You must first delete the existing layout manager (returned by layout()) before you can call setLayout() with the new layout.

from http://doc.qt.io/qt-5.9/qwidget.html#setLayout

Which function is used for deleting the previous layout?

Solution

  • You just use 

    delete layout;

    like you would with any other pointer you created using new.