The questions says it all. Say I have a layout
mylayout
|-- widgetA
`-- widgetB
How do I insert a new widget to this tree?
mylayout
|-- widgetA
|-- widgetC
`-- widgetB
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You should use
QBoxLayout::insertWidget.The index is zero-based,
it means the number of the widget before which the new one will be inserted.
Or, you can think of it as what the index of the inserted item will become.
In this particular case you have: