If the label has been set so that it has an mnemonic key (using i.
e. set_markup_with_mnemonic, set_text_with_mnemonic, Label.with_mnemonic or the “use_underline” property) the label can be associated with a widget that is the target of the mnemonic. When the label is inside a widget (like a Button or a Notebook tab) it is automatically associated with the correct widget, but sometimes (i.e. when the target is a Entry next to the label) you need to set it explicitly using this function.
The target widget will be accelerated by emitting the GtkWidget:GtkLabel:mnemonic-activate signal on it. The default handler
for this signal will activate the widget if there are no mnemonic collisions and toggle focus between the colliding widgets otherwise.
| this |
a Label |
| widget |
the target Widget, or null to unset |