[Solved] Can not generate Cursor KeyEvent
-
Hi
I am generating KeyEvents with this code:
@QWidget *ActWidget = QApplication::focusWidget();
if(ActWidget)
{ datastring.append(inData->mid(uNextPara.l += 1, uLenNextPara.c[0]));
QKeyEvent keyPress(QEvent::KeyPress, datastring.toULong(), Qt::NoModifier);
QApplication::sendEvent(ActWidget, &keyPress);
QKeyEvent keyRelease(QEvent::KeyRelease, datastring.toULong(), Qt::NoModifier);
QApplication::sendEvent(ActWidget, &keyRelease); }
@
This works perfect for Tab, Enter ... but it does not work for the curser keys Up, Down, Left and Right.
I tried with different modifiers, to no avail.I read out the KeyCode used by an attached Keyboard with this:
@case QEvent::KeyPress:
{ QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
qDebug("Key %d pressed, Event type: %d", keyEvent->key(), event->type());
break; }
@to make sure that I use the correct code, which I do.
Any idea what I am doing wrong?Thanks and best regards,
McLion -
Hi,
In your event handler you check for KeyPress only.
I tried this (on Windows):
@
void MyWindow::keyPressEvent(QKeyEvent *evt) {
qDebug() << "Qt press: " << evt->key(); }void MyWindow::keyReleaseEvent(QKeyEvent *evt) {
qDebug() << "Qt release: " << evt->key(); }bool MyWindow::nativeEvent(const QByteArray&, void message, long) {
MSG* msg = reinterpret_cast<MSG*>(message);
switch(msg->message)
{
case WM_KEYDOWN:
qDebug() << "native press:" << msg->wParam; break;
case WM_KEYUP:
qDebug() << "native release:" << msg->wParam; break;
}
return false;
}
@
For arrow keys only the native press event seems to occur, while release is registered by Qt too. Something must be eating the arrow presses i guess but I don't know what. You can either hunt down the eater or just check for release instead of press (if that fits your case). -
I reimplemented the notify of the QApplication object.
I actually did not filter out the KeyPress event (did not return with true and forward to notify) because I just wanted to have the debug output. I now added the KeyRelease event the same way (again, not filtered out) and since then, the cursor keys work.There must be something I don't understand, but it works now ;-)
Thanks.
