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

The wonderful thing about layouts is that they handle a deletion of a widget automatically. So all you really need is to iterate over the widgets and you're done. Since you want to wipe out all children of a given widget, simply do:

for (auto widget: ui->myWidget::findChildren
                                            ({}, Qt::FindDirectChildrenOnly))
  delete widget;

No need to worry about layouts at all. This works whether the children were managed by a layout or not.

If you want to be really correct, you would need to ignore the widgets that are child widgets but are stand-alone windows. This would be the case if this was in general-purpose library code:

for (auto widget: ui->myWidget::findChildren
                                            ({}, Qt::FindDirectChildrenOnly)) 
  if (! widget->windowFlags() & Qt::Window) delete widget;

Alternatively, if you only want to delete the children managed by a given layout and its sublayouts:

void clearWidgets(QLayout * layout) {
   if (! layout)
      return;
   while (auto item = layout->takeAt(0)) {
      delete item->widget();
      clearWidgets(item->layout());
   }
}