c++ - Force QLineEdit to be a collection of double values -

consider problem.

i have qlineedit in tool , should organize support follows. text of lineedit must contain double values, separated comas. f.e. 6.2 , 8, 9.0, 55 must validate, user cannot input other character numbers , comas. should write method convert text vector. thought qregexp , boost::spirit. can hard using these technique.

any ideas?

use next custom validator.

header:

#ifndef validator_h #define validator_h  #include <qvalidator>  class validator : public qvalidator {     q_object public:     explicit validator(qobject *parent = 0);  signals:  public slots: public:     qvalidator::state validate(qstring & input, int & pos) const;  };  #endif // validator_h 

cpp:

#include "validator.h" #include <qdoublevalidator> #include <qdebug> validator::validator(qobject *parent) :     qvalidator(parent) { }  qvalidator::state validator::validate(qstring &input, int &pos) const {     qdebug() << input<< pos;     qdoublevalidator val;     val.setlocale(qlocale(qlocale::german,qlocale::germany));     input.remove(" ");     qstringlist list = input.split(",");     foreach ( qstring var, list) {         int = 0;         if(val.validate(var,i) == qvalidator::invalid)             return qvalidator::invalid;     }     return qvalidator::acceptable;  } 

usage:

ui->lineedit->setvalidator(new validator); 

explanation about: val.setlocale(qlocale(qlocale::german,qlocale::germany));

you said want use 6.2,... . , , different decimal point in different countries. wrote example accordingly question. german locale think . correct point.

but recommend use locale-specific decimal point , use purpose ; separator instead of coma.

there mistakes, try this. edit(improved):

qvalidator::state validator::validate(qstring &input, int &pos) const {     qdebug() << input<< pos;     qregexpvalidator reg(qregexp("[0-9]+(\\.[0-9]+)?$"));     input.remove(" ");     if(input.contains(",,") || input.startswith(","))         return qvalidator::invalid;     qstringlist list = input.split(",");     qdebug()<< list;     bool isok = true;     foreach ( qstring var, list) {         int = 0;         if(reg.validate(var,i) == qvalidator::invalid)             return qvalidator::invalid;         if(reg.validate(var,i) == qvalidator::intermediate)             isok = false;     }     if(isok)         return qvalidator::acceptable;     else         return qvalidator::intermediate; }