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QIntValidator: Difference between revisions
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[[Category:snippets]] | [[Category:snippets]] | ||
[toc align_right="yes" depth="3"] | |||
You can prevent invalid text from being entered into a lineEdit using a validator. This example demonstrates QIntValidator, which only allows integers to be entered into the lineEdit. | You can prevent invalid text from being entered into a lineEdit using a validator. This example demonstrates QIntValidator, which only allows integers to be entered into the lineEdit. | ||
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== Validator.cpp == | == Validator.cpp == | ||
<code> | <code> | ||
#include <QApplication> | |||
#include "form.h" | #include "form.h" | ||
int main(int argc, char *argv[]) | int main(int argc, char *argv[]) | ||
{ | |||
QApplication app(argc, argv); | |||
Form form; | |||
form.show(); | form.show(); | ||
return app.exec(); | |||
} | |||
</code> | |||
== form.h == | == form.h == | ||
<code> | <code> | ||
#ifndef FORM_H | |||
#define FORM_H | |||
#include "ui_form.h" | #include "ui_form.h" | ||
class Form : public QWidget, private Ui::Form | class Form : public QWidget, private Ui::Form | ||
{ | |||
Q_OBJECT | |||
public: | public: | ||
Form(QWidget *parent = 0); | |||
public slots: | public slots: | ||
void on_lineEdit1_textEdited ( const QString & text ); | void on_lineEdit1_textEdited ( const QString & text ); | ||
void on_lineEdit2_textEdited ( const QString & text ); | |||
}; | |||
#endif | #endif | ||
Line 33: | Line 48: | ||
== form.cpp == | == form.cpp == | ||
<code> | <code> | ||
#include <QtGui> | |||
#include <iostream> | #include <iostream> | ||
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#include "form.h" | #include "form.h" | ||
Form::Form(QWidget '''parent) | Form::Form(QWidget '''parent) | ||
: QWidget(parent) | |||
{ | |||
setupUi(this); | |||
// Limit input to valid values between 0 and 255. Either parent ('this' or 'lineEdit') works, I'm not sure what difference it makes. | |||
QIntValidator''' validator = | |||
//new QIntValidator(0, 255, this->lineEdit); | |||
new QIntValidator(0, 255, this); | |||
this->lineEdit1->setValidator(validator); | |||
this->lineEdit2->setValidator(validator); | |||
} | } | ||
void Form::on_lineEdit1_textEdited ( const QString & text ) | void Form::on_lineEdit1_textEdited ( const QString & text ) | ||
{ | |||
std::cout << "text1: " << text.toStdString() << std::endl; | |||
std::cout << "number1: " << text.toUInt() << std::endl; | |||
} | |||
void Form::on_lineEdit2_textEdited ( const QString & text ) | void Form::on_lineEdit2_textEdited ( const QString & text ) | ||
{ | |||
std::cout << "text2: " << text.toStdString() << std::endl; | |||
} | |||
</code> | </code> | ||
Line 52: | Line 84: | ||
== form.ui == | == form.ui == | ||
<code> | <code> | ||
<?xml version="1.0" encoding="UTF-8"?> | |||
<ui version="4.0"> | |||
<class>Form</class> | |||
<widget class="QWidget" name="Form"> | |||
<property name="geometry"> | |||
<rect> | |||
<x>0</x> | |||
<y>0</y> | |||
<width>400</width> | |||
<height>300</height> | |||
</rect> | |||
</property> | |||
<property name="windowTitle"> | |||
<string>Form</string> | |||
</property> | |||
<widget class="QLineEdit" name="lineEdit1"> | |||
<property name="geometry"> | |||
<rect> | |||
<x>250</x> | |||
<y>90</y> | |||
<width>113</width> | |||
<height>27</height> | |||
</rect> | |||
</property> | |||
</widget> | |||
<widget class="QLineEdit" name="lineEdit2"> | |||
<property name="geometry"> | |||
<rect> | |||
<x>250</x> | |||
<y>170</y> | |||
<width>113</width> | |||
<height>27</height> | |||
</rect> | |||
</property> | |||
</widget> | |||
</widget> | |||
<resources/> | |||
<connections/> | |||
</ui> |
Revision as of 11:39, 25 February 2015
[toc align_right="yes" depth="3"]
You can prevent invalid text from being entered into a lineEdit using a validator. This example demonstrates QIntValidator, which only allows integers to be entered into the lineEdit.
Validator.cpp
#include <QApplication>
#include "form.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Form form;
form.show();
return app.exec();
}
form.h
#ifndef FORM_H
#define FORM_H
#include "ui_form.h"
class Form : public QWidget, private Ui::Form
{
Q_OBJECT
public:
Form(QWidget *parent = 0);
public slots:
void on_lineEdit1_textEdited ( const QString & text );
void on_lineEdit2_textEdited ( const QString & text );
};
#endif
form.cpp
#include <QtGui>
#include <iostream>
#include "form.h"
Form::Form(QWidget '''parent)
: QWidget(parent)
{
setupUi(this);
// Limit input to valid values between 0 and 255. Either parent ('this' or 'lineEdit') works, I'm not sure what difference it makes.
QIntValidator''' validator =
//new QIntValidator(0, 255, this->lineEdit);
new QIntValidator(0, 255, this);
this->lineEdit1->setValidator(validator);
this->lineEdit2->setValidator(validator);
}
void Form::on_lineEdit1_textEdited ( const QString & text )
{
std::cout << "text1: " << text.toStdString() << std::endl;
std::cout << "number1: " << text.toUInt() << std::endl;
}
void Form::on_lineEdit2_textEdited ( const QString & text )
{
std::cout << "text2: " << text.toStdString() << std::endl;
}
form.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>Form</class>
<widget class="QWidget" name="Form">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>300</height>
</rect>
</property>
<property name="windowTitle">
<string>Form</string>
</property>
<widget class="QLineEdit" name="lineEdit1">
<property name="geometry">
<rect>
<x>250</x>
<y>90</y>
<width>113</width>
<height>27</height>
</rect>
</property>
</widget>
<widget class="QLineEdit" name="lineEdit2">
<property name="geometry">
<rect>
<x>250</x>
<y>170</y>
<width>113</width>
<height>27</height>
</rect>
</property>
</widget>
</widget>
<resources/>
<connections/>
</ui>