QRegExpValidator maximum value - c++

Question

I would like to use QRegExpValidator in order to force user to:
- type in values only from a certain range (double type),
- the double type should be typed in using dot not coma
- no other formats are allowed
So far I have:
QRegExpValidator* rxv = new QRegExpValidator(QRegExp("[-+]?[0-9]*\\.?[0-9]+([eE][-+]?[0-9]+)?"), this);
This validator forces user to type in only double values with dot. I Dont know however, how to prevent user from typing in values out of range (for example range would be from 0 to 100.0). I Would aprichiate all help.

Answer 1

You can write your own validator, derived from QValidator. All you need is to implement virtual State validate(QString &input, int &pos) const = 0.
UPDATE
Example:
MyValidator.h:
class MyValidator : public QValidator
{
Q_OBJECT
public:
MyValidator(double min, double max, QObject *parent = 0);
State validate(QString &input, int &pos) const;
private:
QRegExp mRexp;
double mMin;
double mMax;
};
MyValidator.cpp:
MyValidator::MyValidator(double min, double max, QObject *parent) :
QValidator(parent)
, mRexp("[-+]?[0-9]*\\.?[0-9]+([eE][-+]?[0-9]+)?")
, mMin(min)
, mMax(max)
{}
QValidator::State MyValidator::validate(QString &input, int &pos) const
{
if (input.isEmpty())
return Acceptable;
if (!mRexp.exactMatch(input))
return Invalid;
const double val = input.toDouble();
if (mMin <= val && val <= mMax)
return Acceptable;
return Intermediate;
}