问题
I'm creating QComboBox with checkboxes. How I can prevent collapsing of view on mouse clicking? I want to be able to set up checkboxes, but each time I click on item - drop-down of QComboBox is collapsed.
Note: currently I'm debugging Qt sources and looking for workaround...
回答1:
First of all you need to install an event filter to the combo box view, i.e.:
combobox->view()->viewport()->installEventFilter(someobj);
than you need to filter all mouse release events that happen on the combo box view to prevent its closing when you click on it:
bool SomeObject::eventFilter(QObject *obj, QEvent *event)
{
if (event->type() == QEvent::MouseButtonRelease) {
int index = view()->currentIndex().row();
if (itemData(index, Qt::CheckStateRole) == Qt::Checked) {
setItemData(index, Qt::Unchecked, Qt::CheckStateRole);
} else {
setItemData(index, Qt::Checked, Qt::CheckStateRole);
}
[..]
return true;
} else {
// Propagate to the parent class.
return QObject::eventFilter(obj, event);
}
}
来源:https://stackoverflow.com/questions/22813494/qcombobox-with-checkboxes