updating radio buttons programmatically

mzimmers

I'm still wading through this, but I did discover a necessary change in the Q_PROPERTY macro:

    Q_PROPERTY(QString ipSource READ ipSource WRITE SetIpSource NOTIFY ipSourceChanged USER true)

It wouldn't compile with the GET/SET terms.

mzimmers

SGaist: in your example above, where does the signal come from that connects to the slot setAddressType()?

SGaist

IIRC, you are using a QDataWidgetMapper for that editor ? Correct, then with that definition, when you call addMapping it will use that property to get and set the data from that widget in the same manner as it does for QLineEdit or QSpinBox.

mzimmers

OK, I think I get this in principle. From an implementation standpoint, how/when should the edit dialog retrieve this information from the custom widget -- another signal/slot?

Thanks...

SGaist

I'm not sure I'm following you here. Isn't that widget already using QDataWidgetMapper ?

mzimmers

Yes:

in editdialog.cpp

IpSourceWidget m_isw; // IpSourceWidget is my custom widget
m_mapper->addMapping(&m_isw, TAG_IP_CONFIG_SRC);

But don't I still have to use this to update the group box? Like this:

    if (qs.toStdString() == IP_SOURCE_TXT[IP_SOURCE_DHCP])
    {
        ui->groupBoxIpAssignment->setChecked(IP_SOURCE_DHCP);
    }
    else
    {
        ui->groupBoxIpAssignment->setChecked(IP_SOURCE_STATIC);
    }

EDIT: OK, that wasn't right. I changed it to this:

 QButtonGroup *m_qbg;    // button group for IP source selection.
 ...
 if (qs.toStdString() == IP_SOURCE_TXT[IP_SOURCE_DHCP])
{
    m_qbg->button(IP_SOURCE_DHCP)->setChecked(true);
}
else
{
    m_qbg->button(IP_SOURCE_STATIC)->setChecked(true);
}

This at least gets the correct value displaying in the edit dialog. Still not sure I'm really doing this right, though.

SGaist

Don't forget to emit the corresponding notification signal if the address type has changed.

mzimmers

Not sure I understand. The code above is in a slot in my edit dialog. Elsewhere I have a connect:

IpSourceWidget *m_isw;
...
QObject::connect(m_isw, &IpSourceWidget::ipSourceChanged, this, &EditDialog::updateIpSource);

Is this the signal you're referring to?

SGaist

I was thinking about where you are emitting ipSourceChanged.

mzimmers

Well, maybe that's part of the problem...I wasn't aware I needed to use that signal.

I'm still feeling my way through this. My IpSource widget doesn't contain any display items; it just handles the model updating. It communicates with the edit dialog through some shared variables:

IpSourceWidget::IpSourceWidget(QWidget *parent, DeviceModel *d, QModelIndex *qmi) :
    QWidget(parent), m_d(d), m_qmi(qmi)
{
}

IpSourceWidget::~IpSourceWidget()
{
}

QString IpSourceWidget::ipSource() const
{
    return QString::fromStdString(IP_SOURCE_TXT[m_ics]);
}

void IpSourceWidget::setIpSource(const QString &source)
{
    m_d->getModel()->setData(*m_qmi, source);
}

I'm getting unexpected results, though. For example, after I press my "commit" button, the argument passed into setIpSource is set to "false." No idea where that's coming from.

SGaist

Why does IpSourceWidget know about DeviceModel and the corresponding QModelIndex ?

The idea behind that widget is that you use it the same way as the QLineEdit you have in your editor widget.

For example in a widget like QLineEdit you have something like:

void MyWidget::setMyStringProperty(const QString &newValue)
{
    if (newValue == currentValue) {
        return;
    }

    currentValue = newValue;
    // Do stuff if needed
    emit myStringPropertyValueChanged(newValue);
}

mzimmers

None of my other widgets require me to do anything other than calls to addMapping(). That's partly why this is so new to me.

In your example, is currentValue a member variable (or a persistent local), or am I obtaining it from the model? I originally thought the latter, but now I'm thinking I got it wrong.

SGaist

Most of the time, it's a member variable.

In the case of your widget, it could be something like:

void IpSourceWidget::setIpSource(const QString& ipSource)
{
    if ((ipSource == IP_SOURCE_DHCP && ui->dhcpButton->isChecked()) ||
         ipSource == IP_SOURCE_STATIC && ui->staticButton->isChecked())) {
        return;
    }

   if (ipSource == IP_SOURCE_DHCP) {
        ui->dhcpButton->setChecked(true);
   } else {
        ui->staticButton->setChecked(true);
   }
   emit ipSourceChanged(ipSource);
}

mzimmers

That all makes sense, but who consumes the signal? You've already updated the ui, so the dialog doesn't need it (that I can see).

Thanks...

EDIT: oh, and continuing with this design, I guess the ipSource widget would merely return the member variable?

SGaist

In this case, QDataWidget mapper will use it. Because you also have to implement the handling of that signal when you click on either of the radio button.

As for the getter:

QString IpSourceWidget::ipSource() const
{
    QString sourceType = "Unkown";
    if (ui->dhcpButton->isChecked() {
        sourceType = IP_SOURCE_DHCP ;
    } else {
        sourceType = IP_SOURCE_STATIC;
    }
    return sourceType;
}

mzimmers

OK, this is starting to come together. Now...as I mentioned above, currently none of the display widgets (radio button or group box) reside in my custom widget. Is this a problem, or is there some way for me to access the widgets in the dialog ui (perhaps passing the ui variable in the c'tor)?

SGaist

The group box and buttons should be moved out of your original editor widget and into IpSourceWidget.

mzimmers

That's how I tried it originally, but then they insisted in showing up in separate windows. Can you point me to the right document to read to get them into the edit widget?

Thanks...

SGaist

I could have wrote it clearer. Remove them from your original editor and either use designer to create the IpSourceWidget UI or do it by code.

mzimmers

OK, this is (yet another) first for me...I assume/hope that it's possible to superimpose my IpSourceWidget onto my EditDialog widget? (If I'm using the write terms)