CODEWITHSUNDEEP
c++qt
MistyD
MistyD

Reputation: 17223

Is it possible for Qvalidator to show a popup

I wanted to know if its possible for QValidator to show a Popup box incase a QlineEdit item is invalid. I know that Qvalidator simply filters the input and only displays the data if its valid. However I want it to display the data that I type in and display a tooltip (popup box) incase the input is invalid.

Upvotes: 2

Views: 1240

Answers (1)

Andreas Fester
Andreas Fester

Reputation: 36630

You can subclass the specific validator you want to use and override its validate method, so that it emits a signal after validation. For example, for a QIntValidator, you could create a sub class as follows (code only showing the relevant excerpts):

Header file:

class QIntValidatorReporter : public QIntValidator {
   Q_OBJECT;

public:
   QIntValidatorReporter(int minimum, int maximum, QObject * parent = 0);

   virtual QValidator::State validate(QString& input, int& pos ) const;

signals:
   void setError(const QString& msg) const;
};

.cpp file:

QValidator::State QIntValidatorReporter::validate(QString& input, int& pos ) const {
   QValidator::State result = QIntValidator::validate(input, pos);

   if (result == QValidator::Invalid) {
      emit setError(QString("Allowed range: %1 to %2").arg(bottom()).arg(top()));
   } else {
      emit setError("");
   }

   return result;
}

By connecting the setError signal to any slot as required, you can implement your required functionality to report the validation state.

See https://github.com/afester/StackOverflow/tree/master/Qt/QValidator for a complete sample project.

Upvotes: 2

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