[SOLVED] QMessageBox Buttons

Corpse0327

Hi

I have a QDialog and when pressed close, i want to open a QMessageBox and ask whether or not to save.

Normally one would use

QMessageBox::StandardButton reply;

reply = QMessageBox::question(this
                              , "Closing"
                              , "Do you want to save?"
                              , QMessageBox::Yes | QMessageBox::No | QMessageBox::Cancel);

But i want some more features. First is to be able to change buttons' texts. Secondly i want to make Yes button unclickable, if some condition is not met.

So i figured out i need to manually do it

    QMessageBox messageBox;
    messageBox.setWindowTitle("Do you want to save?");
    messageBox.addButton(BUTTON_YES, QMessageBox::YesRole);
    messageBox.addButton(BUTTON_NO, QMessageBox::NoRole);
    messageBox.addButton(BUTTON_CANCEL, QMessageBox::RejectRole);
    messageBox.setEscapeButton(QMessageBox::Cancel);
    messageBox.setDefaultButton(QMessageBox::Yes);

    QList<QAbstractButton*> messageBoxButtons = messageBox.buttons();

    // How do i get buttons properly? 
    connect(messageBoxButtons.at(0), SIGNAL(clicked(bool))
            , this, SLOT(messageBoxYesClicked(bool)));
    connect(messageBoxButtons.at(1), SIGNAL(clicked(bool))
            , this, SLOT(messageBoxNoClicked(bool)));
    connect(messageBoxButtons.at(2), SIGNAL(clicked(bool))
            , this, SLOT(messageBoxCancelClicked(bool)));

    if(canSaveContent() == false)
        // Set YesRole button to disabled

    messageBox.exec();

    if(m_reply == QMessageBox::Yes)
        // Do something
    else if(m_reply == QMessageBox::No)
        // Do something
    else
        // Do something

These functions merely sets m_reply with proper values.

void DialogEntryNote::messageBoxYesClicked(bool checked)
{
    Q_UNUSED(checked)

    m_reply = QMessageBox::Yes;
}

How do i get buttons properly? I want to connect the button' clicked() signal with function slots i prepared.

I think my current method is lame. I want to do it the right way. What sort of methods should i follow?

Thank you in advance for any advice.

mcosta

Hi,

you forget that QMessageBox::exec() returns the code of clicked button; so

QMessageBox mbox;
...

m_reply = mbox.exec();

is enough to know which button was clicked (no signals, slots)

mchinand

See the maybeSave() function in this example.

Corpse0327

@mcosta exec() returns int. Can you eleborate a little bit more please?

Also doc says

When using QMessageBox with custom buttons, this function returns an opaque value; use clickedButton() to determine which button was clicked.

Does button roles acts the same as standard buttons?

I can check the text on the clicked button for that purpose maybe.

mcosta

Hi,

using msgBox.standardButton(msgBox.clickedButton()) you can get the code

Corpse0327

@mcosta msgBox.standardButton(msgBox.clickedButton()) always returns QMessageBox::NoButton.

Returns the standard button enum value corresponding to the given button, or NoButton if the given button isn't a standard button.

I assume thats because messageBox.addButton(BUTTON_YES, QMessageBox::YesRole); does not create a standard button. I searched for a method to get clicked buttons given role. But no help :(

I tried using button text, which solved my problems but that just feels lame :(

SGaist

Hi,

Then why not just:

if (BUTTON_YES == messageBox.clickedButton()) {
// do stuff
}

?

Corpse0327

@SGaist BUTTON_YES == messageBox.clickedButton().text()

Yeah, i did that after realizing there is no other solution :(

SGaist

Sorry, I thought that BUTTON_YES was a pointer to a QAbstractButton instance.

What I was referring to is described in the documentation of clickedButton