How should I select QListWidgetItem by space-key

[wysota]

No, I meant to manipulate the item selection model of the view.

A simplified version would be something close to this:

void MyView::keyPressEvent(QKeyEvent *event){
  if(event->key()!=Qt::Key_Space) { QAbstractItemView::keyPressEvent(event); return; }
  selectionModel()->select(currentIndex(), QItemSelectionModel::SelectCurrent);
}

void MyView::keyPressEvent(QKeyEvent *event){
  if(event->key()!=Qt::Key_Space) { QAbstractItemView::keyPressEvent(event); return; }
  selectionModel()->select(currentIndex(), QItemSelectionModel::SelectCurrent);
}

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