show modal qml-dialog from c++

[themts]

Hey guys,

I want to show a modal qml dialog from c++.
What I did:

• created a qmlObject which represents my dialog
• created a static c++ class and forward the object to it

void NMessageBox::initMessageBox(QObject *dialogComponent)
{
    NMessageBox::getInstance().m_dialogComponent = dialogComponent;
    QObject::connect(NMessageBox::getInstance().m_dialogComponent, SIGNAL(confirm(int)), &NMessageBox::getInstance(), SLOT(dialogConfirmed(int)));
}

• now I can call nShowMessage() which looks like this:

MessageBoxResult nShowMessage(MessageBoxType messageBoxType, MessageBoxButtons buttons,
                               const QString &title, const QString &message, const QString &description)
{    
    QEventLoop loop;
    loop.connect(&NMessageBox::getInstance(), SIGNAL(dialogClosed()), SLOT(quit()));
    if (NMessageBox::getInstance().showMessage(messageBoxType, buttons, title, message, description) == 0)
        loop.exec();

    return NMessageBox::getInstance().lastResult();
}

• the show Message-function does this:

    QMetaObject::invokeMethod(m_dialogComponent, "show", Q_RETURN_ARG(QVariant, returnedValue),
                              Q_ARG(QVariant, buttons.testFlag(MessageBoxButton::Ok)),
                              Q_ARG(QVariant, buttons.testFlag(MessageBoxButton::Cancel)),
                              Q_ARG(QVariant, buttons.testFlag(MessageBoxButton::No)),
                              Q_ARG(QVariant, buttons.testFlag(MessageBoxButton::Yes)));

Problem:
Somehow this QEventLoop seems to be buggy:
Lets say you press a button(a) which invokes a c++ function which would use my nShowMessage-function to show the dialog.
Now the dialog shows up, but mouseclicks are somehow forwarded to my button(a), no matter where I click.
When you click around like crazy it suddenly works again.

As soon as I remove the QEventLoop everything works as expected.
I hope someone can follow me as this problem is hard to debug and I cannot give you more information at this time.

CU
mts

[themts]

Hey guys,

I know this post is quite old but I still have this problem (QT 5.7 now).

->EDIT:
ok, problem found.
I didn't know that a c++ function is always called from qml as directConnection.
That way I was interrupting my main message-loop. I had to add a helper function which I invoke with Qt::QueuedConnection.