I want to add the same footer to all the custom QWidgets.

I tried something like

m_tab_footer = new TabFooter(this);
qobject_cast<tabA*>(ui->text_area->widget(0))->setTabFooter(m_tab_footer);
qobject_cast<tabB*>(ui->text_area->widget(1))->setTabFooter(m_tab_footer);
qobject_cast<tabC*>(ui->text_area->widget(2))->setTabFooter(m_tab_footer);

with setTabFooter defined as

void tabA::setTabFooter(TabFooter* footer) {
   ui->layout_footer->addWidget(footer);
}

tabA, tabB and tabC are set for each tab of the QTabWidget in QtDesigner.

Unfortunately, there are several problem. First it is highly redundant and I guess it is possible to factorize. Secondly, it does not work because the footer only appears on the tabC widget, probably because the layout_footer takes the ownership of the TabFooter object.

I guess tabA, tabB and tabC should inherit from a common class that would contain the FooterTab object. Yet, I do not know (probably too tired now) how to integrate the current tabA/tabB/tabC content into this common class.

Thanks for your help.