QInputDialog::getText, maxLenght String?

[Ant02]

Hello,

I’m working on a Qt proget is my problem is the following:

I am desperately trying to find a solution to limit the number of characters to enter in a "Qinputdialog::getText"

With a Qlineedit, we use the maxLenght method, but the for "Qt Qinputdialog" I dry!

void TW_S_Rck::renameTextBank()
    {
        bool ok = false;
        int index = listeDeroulanteBank->currentIndex();
        QString buff = nameBank[index];
 
        nameBank[index] = QInputDialog::getText(this,"Rename Bank","",QLineEdit::Normal, QString("%1").arg(nameBank[index]), &ok);
 
        if(ok && !nameBank[index].isEmpty()){listeDeroulanteBank->setItemText(index,nameBank[index]);}
        else{nameBank[index] = buff;}
    }

Thank you in advance for your help.

Regards, Antoine

[Pl45m4]

@Ant02

Hi,

have you tried to react on this signal? (https://doc.qt.io/qt-5/qinputdialog.html#textValueChanged)
Whenever the text changes, you could check if the number of characters exceeds your threshold and then ignore any additional input.

[JonB]

@Ant02
Because QInputDialog::getText() cannot be hooked to a QValidator --- which you could have on your own dialog --- if you want to stick with QInputDialog you must indeed do it as @Pl45m4 has written.

[Ant02]

Thank you for your answers,
I will test "Qinputdialog:: textValueChanged", but how to analyze the readable tank number?

Can an example be?
Thank you

[mrjj]

Hi

Can an example be?

Sure. You have to use the non static way/version of the Dialog.

   QInputDialog inp; // we make own dialog
   // set some of the common options
    inp.setWindowTitle("title");
    inp.setLabelText("label");
    inp.setTextValue("1234");
  // connect the signal
    connect(&inp, &QInputDialog::textValueChanged, this, [&inp](const QString text) {
        const int maxtext = 4;
        if (text.length() > maxtext) // check text and cap it. (you might want different)
            inp.setTextValue( text.right(maxtext) );
        qDebug() << text;
    });

    int ret = inp.exec(); // run it
// check if user pressed ok
    if (ret == QDialog::DialogCode::Accepted )
        qDebug() << "ok";

You could wrap it up in your own GetText Function for easy reuse.

[Ant02]

@mrjj

J'ai tester votre code, ca ne marche pas chez moi, j'ai les erreur suivante:

void TW_S_Rck::renameTextBank()
    {
    /*
        bool ok = false;
        int index = listeDeroulanteBank->currentIndex();
        QString buff = nameBank[index];
*/
        QInputDialog inp; // we make own dialog
           // set some of the common options
            inp.setWindowTitle("title");
            inp.setLabelText("label");
            inp.setTextValue("1234");
          // connect the signal
            connect(&inp, &QInputDialog::textValueChanged, this, [&inp](const QString text) {
                const int maxtext = 4;
                if (text.length() > maxtext) // check text and cap it. (you might want different)
                inp.setTextValue( text.right(maxtext) );
                qDebug() << text;
            });

            int ret = inp.exec(); // run it
        // check if user pressed ok
            if (ret == QDialog::DialogCode::Accepted )
                qDebug() << "ok";
    }

erreur : no matching function for call to 'TW_S_Rck::connect(QInputDialog*, void (QInputDialog::)(const QString&), TW_S_Rck const, TW_S_Rck::renameTextBank()::__lambda0)'

erreur : template argument for 'template<class Func1, class Func2> static QMetaObject::Connection QObject::connect(const typename QtPrivate::FunctionPointer<Func>::Object*, Func1, const typename QtPrivate::FunctionPointer<Func2>::Object*, Func2, Qt::ConnectionType)' uses local type 'TW_S_Rck::renameTextBank()::__lambda0'

erreur : 'QInputDialog::DialogCode' is not a class or namespace

[mpergand]

Ca fonctionne bien pour moi.
Essaye de supprimer l'argument this
connect(&inp, &QInputDialog::textValueChanged, this, [&inp](const QString text)
Et si TW_S_Rck n'est pas un QObject, utilise la fonction statique QObject::connect

[Ant02]

@mpergand

J'ai tester sans le this, aucun résulta!
TW_S_Rck est un QObject.
void TW_S_Rck::renameTextBank() est un Slot. Est le problème?

le code avec les deux ligne en gras qui donne l'erreur

void TW_S_Rck::renameTextBank()
    {

        bool ok = false;
        int index = listeDeroulanteBank->currentIndex();
        QString buff = nameBank[index];

        QInputDialog inp; // we make own dialog
           // set some of the common options
            inp.setWindowTitle("title");
            inp.setLabelText("label");
            inp.setTextValue("1234");
          // connect the signal

            QObject::connect(&inp, &QInputDialog::textValueChanged, this,[&inp](const QString text) {
                const int maxtext = 4;
                if (text.length() > maxtext) // check text and cap it. (you might want different)
                inp.setTextValue( text.right(maxtext) );
                qDebug() << text;
            **});**

            int ret = inp.exec(); // run it
        // check if user pressed ok
            **if (ret == QDialog::DialogCode::Accepted )**
                qDebug() << "ok";
    }

[Ant02]

Après d'autre réponse, j'ai trouvé une solution qui fonction bien:

void 
    {
        QInputDialog *dialog = new QInputDialog(this);
            dialog->setInputMode(QInputDialog::TextInput);
            dialog->setWindowTitle("Rename Bank");
            dialog->setLabelText("");
            dialog->setTextValue(nameBank[index]);

            QLineEdit *lineEdit = dialog->findChild<QLineEdit *>();
            lineEdit->setMaxLength(16);

            if (dialog->exec() == QDialog::Accepted)
            {
                nameBank[index] =  dialog->textValue();
                listeDeroulanteBank->setItemText(index,nameBank[index]);
            }
            else
            {
                // Saisie annulée
            }
    }

Merci pour vos réponses rapide!
Cordialement, Antoine