src_gui_util_qvalidator.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QLineEdit>
#include <QValidator>
#include <QWidget>
 
namespace src_gui_util_qvalidator {
 
struct Wrapper : public QWidget {
    void wrapper0();
    void wrapper1();
    void wrapper2();
    void wrapper3();
};
 
void Wrapper::wrapper0() {
QValidator *validator = new QIntValidator(100, 999, this);
QLineEdit *edit = new QLineEdit(this);
 
// the edit lineedit will only accept integers between 100 and 999
edit->setValidator(validator);
 
 
QString str;
int pos = 0;
QIntValidator v(100, 900, this);
 
str = "1";
v.validate(str, pos);     // returns Intermediate
str = "012";
v.validate(str, pos);     // returns Intermediate
 
str = "123";
v.validate(str, pos);     // returns Acceptable
str = "678";
v.validate(str, pos);     // returns Acceptable
 
str = "999";
v.validate(str, pos);    // returns Intermediate
 
str = "1234";
v.validate(str, pos);     // returns Invalid
str = "-123";
v.validate(str, pos);     // returns Invalid
str = "abc";
v.validate(str, pos);     // returns Invalid
str = "12cm";
v.validate(str, pos);     // returns Invalid
} // Wrapper::wrapper0
 
void Wrapper::wrapper1() {
QString s;
QIntValidator v(100, 900, this);
 
int pos = 0;
 
s = "abc";
v.validate(s, pos);    // returns Invalid
 
s = "5";
v.validate(s, pos);    // returns Intermediate
 
s = "50";
v.validate(s, pos);    // returns Acceptable
} // Wrapper::wrapper1
 
 
void Wrapper::wrapper2() {
 
// regexp: optional '-' followed by between 1 and 3 digits
QRegularExpression rx("-?\\d{1,3}");
QValidator *validator = new QRegularExpressionValidator(rx, this);
 
QLineEdit *edit = new QLineEdit(this);
edit->setValidator(validator);
 
// integers 1 to 9999
QRegularExpression re("[1-9]\\d{0,3}");
// the validator treats the regexp as "^[1-9]\\d{0,3}$"
QRegularExpressionValidator v(re, 0);
QString s;
int pos = 0;
 
s = "0";     v.validate(s, pos);    // returns Invalid
s = "12345"; v.validate(s, pos);    // returns Invalid
s = "1";     v.validate(s, pos);    // returns Acceptable
 
re.setPattern("\\S+");            // one or more non-whitespace characters
v.setRegularExpression(re);
s = "myfile.txt";  v.validate(s, pos); // Returns Acceptable
s = "my file.txt"; v.validate(s, pos); // Returns Invalid
 
// A, B or C followed by exactly five digits followed by W, X, Y or Z
re.setPattern("[A-C]\\d{5}[W-Z]");
v.setRegularExpression(re);
s = "a12345Z"; v.validate(s, pos);        // Returns Invalid
s = "A12345Z"; v.validate(s, pos);        // Returns Acceptable
s = "B12";     v.validate(s, pos);        // Returns Intermediate
 
// match most 'readme' files
re.setPattern("read\\S?me(\\.(txt|asc|1st))?");
re.setPatternOptions(QRegularExpression::CaseInsensitiveOption);
v.setRegularExpression(re);
s = "readme";      v.validate(s, pos); // Returns Acceptable
s = "README.1ST";  v.validate(s, pos); // Returns Acceptable
s = "read me.txt"; v.validate(s, pos); // Returns Invalid
s = "readm";       v.validate(s, pos); // Returns Intermediate
 
} // Wrapper::wrapper2
 
void Wrapper::wrapper3()
{
QString input = "0.98765e2";
QDoubleValidator val;
val.setLocale(QLocale::C);
val.setNotation(QDoubleValidator::ScientificNotation);
val.fixup(input); // input == "9.8765e+01"
input = "-1234.6789";
val.setDecimals(2);
val.setLocale(QLocale::C);
val.setNotation(QDoubleValidator::StandardNotation);
val.fixup(input); // input == "-1234.68"
} // Wrapper::wrapper3
 
} // src_gui_util_qvalidator