QMessageBox::question does not close when I click on X button but works when we have cancel button why so

Qt Enthusiast

I have following code

File dialog.h

class Dialog : public QDialog
{
Q_OBJECT

public:
    Dialog(QWidget *parent = 0);

private slots:
    void questionMessage();
};

Case1:

dialog.cpp

void Dialog::questionMessage()
{
    QMessageBox::StandardButton reply;
    reply = QMessageBox::question(this, tr("QMessageBox::question()"),
                                MESSAGE,
                                QMessageBox::Yes | QMessageBox::No  );

    if (reply == QMessageBox::Yes)
        qDebug() << "Yes";
    else if (reply == QMessageBox::No)
       qDebug() << "No";
    else
       qDebug() << "Cancel";
  }

The issue is when I click on X mark at the top right then the QMessagebox does not get closed

Case2:

but If I have following code

void Dialog::questionMessage()
{
    QMessageBox::StandardButton reply;
    reply = QMessageBox::question(this, tr("QMessageBox::question()"),
               "MESSAGE",
               QMessageBox::Yes | QMessageBox::No |  QMessageBox::Cancel);       

    if (reply == QMessageBox::Yes)
        qDebug() << "Yes";
    else if (reply == QMessageBox::No)
       qDebug() << "No";
    else
       qDebug() << "Cancel";
  }

If I put QMessageBox::Cancel then it is working fine . It will be helpful if someone can guide me why I am not able to close QMessageBox with X in Case1

raven-worx

@Qt-Enthusiast
You mean the whole dialog window doesn't get closed and stays visible?!

you return false when the answer is 'no'. What do you do when the answer is yes?
Where is this code contained in?

Qt Enthusiast

I am doing nothing after yes

answer = QMessageBox::information(this, QObject::tr(Name),
                                       QString(QObject::tr("Messages. ")),
                                       QMessageBox::Ok);

Noting and I am not getting this behavior when I have QMessageBox::information

VRonin

What OS and Qt version are you running?

Qt Enthusiast

qt 4.3.3 and centos 6.4

VRonin

It might be a bug, difficult to act on such an old version. try building it manually instead of using the static method:

QPointer<QMessageBox> questionBox=new QMessageBox(QMessageBox::Question,tr("Dialog"),tr(" Do you want to continue?"),QMessageBox::Yes | QMessageBox::No ,this);
questionBox->setDefaultButton(QMessageBox::Yes);
const int ret = questionBox->exec();
if(questionBox)
questionBox->deleteLater();
if(ret==QMessageBox::No){
return false;
}

If you are interested in why I use QPointer see https://blogs.kde.org/2009/03/26/how-crash-almost-every-qtkde-application-and-how-fix-it-0

Qt Enthusiast

if I put QMessageCancel then it is working fine why so

 answer = QMessageBox::question(parent, QObject::tr("MY NAME"),
                                   QString(QObject::tr(" Do you want to continue?"))),
                                   QMessageBox::Yes | QMessageBox::No| QMessageBox::Cancel);

VRonin

Looks like it's a Bug in your Qt version. did you try my solution?

If it doesn't work try subclass QMessageBox reimplement closeEvent() and call reject() from there

Qt Enthusiast

Just to be sure of qt4.3.3 it works fine on centos 6 and it does not work on rhel 5 linux any idea on KDE settings

Qt Enthusiast

That is not the correct solution we need to find the proper cause

SGaist

Hi,

Do you realise that you are asking about looking for a solution on a 10 years old version of Qt ? Are you locked to Qt 4.3.3 ?

VRonin

@Qt-Enthusiast said in QMessageBox::question does not close when I click on X button but works when we have cancel button why so:

That is not the correct solution

What do you mean? the messagebox is not closed or you just prefer using the static method rather than building the object?