Question

I wish for an “event” to happen when enter key is pressed while a qtreeview is selected. As I prefer not to subclass qtreeview (easier for the designer) – I tried to install an event filter. However this didn’t seem to work:

The class simply contains a public function:

bool InputTreeEventHandler::eventFilter(QObject *obj, QEvent *event) const {
    if (event->type() == QEvent::KeyPress) {
        QKeyEvent *keyevent = dynamic_cast<QKeyEvent*>(event);
        QTreeView* tree = dynamic_cast<QTreeView*>(obj);
        if (keyevent->key() == Qt::Key_Enter) {
            //code
        }
    } else {
        return false;
    }

}

And the event is added like the following:

ui.InputTreeView->installEventFilter(InputTreeKeyboardEater.get());

Where ui.InputTreeView is the treeview I wish to act when pressing enter, and InputTreeKeyboardEater a (shared) pointer to an object of InputTreeEventHandler

When putting a breakpoint at start of function above it shows the whole event handler isn’t even called – what can I be doing wrong?

Answer 1

See here—QObject::eventFilter isn’t const, which would explain your problem. InputTreeView is looking to call a non-const version, which isn’t there. Also eventFilter is protected not public though I don’t think that’s critical.