updating radio buttons programmatically

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)

SGaist

I think you might be overcomplicating how things are working. IpSourceWidget is just a widget that's slightly more complex than a QLineEdit. In your editor widget, put an empty widget where IpSourceWidget should be and then use the promote feature to use it.

Or, in the constructor of your editor widget, you can prepend an instance of IpSourceWidget to the layout you are using for your editor widget.

mzimmers

OK, I created a new QT designer form class. I'm getting compile errors that suggest my class is incomplete.

Here's my header file; what might I be missing?

#include <QGroupBox>

namespace Ui 
{
    class IpSource;
}

class IpSource : public QGroupBox
{
    Q_OBJECT
    Q_PROPERTY(QString ipSource READ ipSource WRITE setIpSource NOTIFY ipSourceChanged USER true)

public:
    explicit IpSource(QWidget *parent = nullptr);
    ~IpSource();
    QString ipSource() const;

signals:
    void ipSourceChanged(const QString &source);

public slots:
    void setIpSource(const QString &source);

private:
    Ui::IpSource *ui;
};

And the start of my c'tor:

IpSource::IpSource(QWidget *parent) :
    QGroupBox(parent),
    ui(new Ui::IpSource)
{
...

I get this:
C:\Users\MZimmers\CD desktop apps\Qt projects\wb_utility\ipsource.cpp:6: error: invalid use of incomplete type 'class Ui::IpSource'
ui(new Ui::IpSource)
^ // caret pointing to IpSource

medyakovvit

@mzimmers Check that you have

include "ui_ipsource.h";

in ipsource.cpp file

mzimmers

@medyakovvit thanks for looking. Yes, I do have that. Here's the start of my source file:

#include "ipsource.h"
#include "ui_ipsource.h"

IpSource::IpSource(QWidget *parent) :
    QGroupBox(parent),
    ui(new Ui::IpSource)
{
    ui->setupUi(this);
}

medyakovvit

@mzimmers Check that "ui_ipsource.h" contains what you expect.

mzimmers

Ah...that revealed the problem. In my fumbling around, I'd renamed the class in Designer. I just changed it back, and it seems to be good now. Thanks...now back to my struggles with those radio buttons.

mzimmers

I've added a Widget to my edit dialog, and promoted it to class IpSource. It displays correctly, but I can't access it programmatically, at least not with the "ui->" pointer I'm accustomed to using.

Did I miss a step? I've never used promotions before.

EDIT: this question is irrelevant to the thread, so I'm going to ask it in a separate thread.

mzimmers

OK, I believe I now have this beaten into submission. Here's my understanding of the necessary ingredients:

upon determining the need for an internal (programmatic) change to the status of the radio buttons, the model needs to be set or updated appropriately:

    // the IP configuration source.
    QString qs = QString::fromStdString(msg->getValue(msgTag[TAG_IP_CONFIG_SRC]));
    QVariant qv = m_model->data(m_model->index(row, TAG_IP_CONFIG_SRC));
    if (qs != qv)
    {
        m_model->setData(m_model->index(row, TAG_IP_CONFIG_SRC), qs);
        emit ipSourceChanged(qs);
    }

a custom designer class, based on QGroupBox, is necessary:

class IpSource : public QGroupBox
{
    Q_OBJECT
    Q_PROPERTY(QString ipSource READ ipSource WRITE setIpSource NOTIFY ipSourceChanged USER true)

public:
    explicit IpSource(QWidget *parent = nullptr);
    ~IpSource();
    QString ipSource() const;

signals:
    void ipSourceChanged(const QString &source);

public slots:
    void setIpSource(const QString &source);

private:
    Ui::IpSource *ui;

from your parent dialog (if that's the right term), create an empty widget, and promote it to your custom widget.
the syntax for retrieving the value of the radio button group was a little tricky at first, but it goes like this:

        string s = ui->ipSource->ipSource().toStdString();

(you can ignore the StdString part if you're just using QStrings; I have to share my constants header file with a firmware app.

If anyone feels that the above needs correction/improvement, please let me know.

Thanks to everyone who helped on this.