Qt - Clear all widgets from inside a QWidget's layout

Question

I have a QWidget in a dialog. Over the course of the program running, several QCheckBox * objects are added to the layout like this:

Answer 1

Given that you have a widget hierarchy consisting of cascaded layouts containing widgets then you should better go for the following.

Step 1: Delete all widgets

    QList< QWidget* > children;
    do
    {
       children = MYTOPWIDGET->findChildren< QWidget* >();
       if ( children.count() == 0 )
           break;
       delete children.at( 0 );
    }
    while ( true );

Step 2: Delete all layouts

    if ( MYTOPWIDGET->layout() )
    {
        QLayoutItem* p_item;
        while ( ( p_item = MYTOPWIDGET->layout()->takeAt( 0 ) ) != nullptr )
            delete p_item;
        delete MYTOPWIDGET->layout();
    }

After step 2 your MYTOPWIDGET should be clean.