[Qt-interest] Issue with softkeys on Symbian

[Tomasz Baniak]

Hi!

Lately i stumbled upon a crash in an app i'm currently developing.
When i was clicking softkeys very fast on my app i run into some null
pointers/whatever pointers and eventually crashing.
i tried to reproduce the same issue on Windows (well, as long as Windows
does not have softkeys i used 'nearly' the same scenario) without any luck.

Here is what i do:
1) add softkey
2) connect it with some slot which is a bit heavy (for Symbian) and in the
slot i also delete the action with deleteLater() and set some other
action/no action in place
3) i start to click fast and bang goes the crash

I prepared a small example project that does moreover what my app would do.
Though i can't crash this app in the same way (i still did not found where i
crash in my app though i'm pretty sure it is connected with double
triggering actions) it still wonders me why am i failing on the ASSERTions.
Shouldn't it happen synchronously? I mean one slot finishes and then the
other and so on?
Why is it possible to trigger the same action twice even though it is
deleted, removed and nullified in a slot that is connected to trigger
signal?

compilable example attached

Regards,
Tomek

void MainWindow::actionTriggered()

{

    Q_ASSERT(m_action2 == 0);

    qDebug() << "actionTriggered()";

    m_action->deleteLater();

    removeAction(m_action);

    m_action = 0;

     m_action2 = new QAction("action 2", this);

    m_action2->setSoftKeyRole(QAction::PositiveSoftKey);

    connect(m_action2, SIGNAL(triggered()), this, SLOT(action2Triggered()));

    addAction(m_action2);

    someHeavyFunction();

}

void MainWindow::action2Triggered()

{

    Q_ASSERT(m_action == 0);

    qDebug() << "action2Triggered()";

    m_action2->deleteLater();

    removeAction(m_action2);

    m_action2 = 0;

     m_action = new QAction("action", this);

    m_action->setSoftKeyRole(QAction::PositiveSoftKey);

    connect(m_action, SIGNAL(triggered()), this, SLOT(actionTriggered()));

    addAction(m_action);

    someHeavyFunction();

}

 void MainWindow::someHeavyFunction()

{

    qDeleteAll(m_buttonList->begin(), m_buttonList->end());

    m_buttonList->clear();

    for (int i = 0; i<100;i++)

    {

        QPushButton *button = new QPushButton(this);

        m_buttonList->append(button);

        centralWidget()->layout()->addWidget(button);

    }

}
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