Validating multiple discontinuous ranges

[tbscope]

Why not create your own validator?

[Nivek]

Why not create your own validator?

Well, a good way of doing that is essentially what I'm asking about. How would I go about doing that? Could I make a validator that keeps its own list of one validator for each separate range?

[tbscope]

This is a five second example. The logic is all wrong, that's up to you to fix :-)
But this is the idea:

header file

#ifndef QRANGEVALIDATOR_H
#define QRANGEVALIDATOR_H
 
#include <QValidator>
 
#include <QList>
#include <QString>
 
struct Range
{
    int low;
    int high;
};
 
class QRangeValidator : public QValidator
{
    Q_OBJECT
public:
    explicit QRangeValidator(QObject *parent = 0);
 
    void addRange(int low, int high);
 
    QValidator::State validate(QString &input, int &pos) const;
 
signals:
 
public slots:
 
private:
    QList<Range *> m_ranges;
 
};
 
#endif // QRANGEVALIDATOR_H

#ifndef QRANGEVALIDATOR_H
#define QRANGEVALIDATOR_H

#include <QValidator>

#include <QList>
#include <QString>

struct Range
{
    int low;
    int high;
};

class QRangeValidator : public QValidator
{
    Q_OBJECT
public:
    explicit QRangeValidator(QObject *parent = 0);

    void addRange(int low, int high);

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

signals:

public slots:

private:
    QList<Range *> m_ranges;

};

#endif // QRANGEVALIDATOR_H

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cpp file

#include "qrangevalidator.h"
 
QRangeValidator::QRangeValidator(QObject *parent) :
    QValidator(parent)
{
}
 
void QRangeValidator::addRange(int low, int high)
{
    Range *newRange = new Range;
    newRange->low = low;
    newRange->high = high;
 
    m_ranges.append(newRange);
}
 
QValidator::State QRangeValidator::validate(QString &input, int &pos) const
{
    int value = input.toInt();
    bool inRanges = false;
 
    foreach(Range *r, m_ranges) {
        if ( (value >= r->low) && (value <= r->high) ) {
            inRanges = true;
            break;
        }
    }
 
    if (!inRanges)
        return QValidator::Acceptable;
    else
        return QValidator::Invalid;
}

#include "qrangevalidator.h"

QRangeValidator::QRangeValidator(QObject *parent) :
    QValidator(parent)
{
}

void QRangeValidator::addRange(int low, int high)
{
    Range *newRange = new Range;
    newRange->low = low;
    newRange->high = high;

    m_ranges.append(newRange);
}

QValidator::State QRangeValidator::validate(QString &input, int &pos) const
{
    int value = input.toInt();
    bool inRanges = false;

    foreach(Range *r, m_ranges) {
        if ( (value >= r->low) && (value <= r->high) ) {
            inRanges = true;
            break;
        }
    }

    if (!inRanges)
        return QValidator::Acceptable;
    else
        return QValidator::Invalid;
}

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Simple usage example:

#include "widget.h"
#include "ui_widget.h"
 
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
 
    m_validator = new QRangeValidator;
 
    m_validator->addRange(10, 20);
    m_validator->addRange(30, 40);
 
    connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(checkRange()));
}
 
Widget::~Widget()
{
    delete ui;
}
 
void Widget::checkRange()
{
    int pos = 0;
    QString txt = ui->lineEdit->text();
 
    if (m_validator->validate(txt, pos))
        ui->lineEdit->setText("Invalid number");
    else
        ui->lineEdit->setText("Yes, correct");
 
}

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    
    m_validator = new QRangeValidator;
    
    m_validator->addRange(10, 20);
    m_validator->addRange(30, 40);
    
    connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(checkRange()));
}

Widget::~Widget()
{
    delete ui;
}

void Widget::checkRange()
{
    int pos = 0;
    QString txt = ui->lineEdit->text();
    
    if (m_validator->validate(txt, pos))
        ui->lineEdit->setText("Invalid number");
    else
        ui->lineEdit->setText("Yes, correct");
    
}

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[Nivek]

Thanks tbscope, I'll try that out!