A bit late for an answer, but in case someone else pops up on this via google;
You can add an icon by changing the QAbstractButton property. Just use:
QAbstractButton {
qproperty-icon: theme_url("/button_action/add");
}
(QAbstractButton) . QProcessButton QAbstractButton, . (, QPushButton ).
, , .
, QT-Documentation .
PS. ,
qproperty-icon: url(":/Icons/before_click.png") off,
url(":/Icons/after_click.png") on ;