update/change QListWidget item value

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I have created a Qlistwidget having some items(3 rows)
Total Errors:: __
Total Warnings:: __
Total Voilations:: __

I want to know how to update the QListWidget each item while executing the thread? I have counter variable for each item of the QListWidget(ErrCount, WarCount, VCount). All Counters are zero initially.

Thanks

Posted 24-Jan-16 23:48pm

XamBEE

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Jochen Arndt · Accepted Answer · 2016-01-25T03:14:00

If the update should be initiated by another thread, you should create an event for that:

C++

// MyDialog.h
// This must be unique for the application.
#define UPDATE_COUNT_EV QEvent::User

class UpdateCountEvent : public QEvent
{
public:
    UpdateCountEvent(int err, int warn, int v) :
        QEvent((QEvent::Type)UPDATE_COUNT_EV),
        errCount(err),
        warnCount(warn),
        vCount(v)
    {
    }
    int errCount;
    int warnCount;
    int vCount;
};

class MyDialog : public QDialog
{
    // ...
    void customEvent(QEvent *event);
};

C++

// MyDialog.cpp
void MyDialog::customEvent(QEvent *event)
{
    if (static_cast<int>(event->type()) == UPDATE_COUNT_EV)
    {
        const UpdateCountEvent *ev = static_cast<const updatecountevent="">(event);
        ui->listWidget->item(0)->setText(QString("Total Errors: %1").arg(ev->errCount));
        ui->listWidget->item(1)->setText(QString("Total Warnings: %1").arg(ev->warnCount));
        ui->listWidget->item(2)->setText(QString("Total Violations: %1").arg(ev->vCount));
    }
}
</const></int>

The event can now be send from another thread (requires inclusion of the header that defines UpdateCountEvent and a pointer to the dialog widget):

QCoreApplication::postEvent(pDialogWidget, new UpdateCountEvent(ErrCount, WarnCount, VCount));

If you want to update only single values, create three events and update the list items in MyDialog::customEvent accordingly.