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# QRadioButton Class Reference
[QtGui module]

The QRadioButton widget provides a radio button with a text label. More...

     #include <QRadioButton>

Inherits QAbstractButton.

- List of all members, including inherited members
- Qt 3 support members

### Public Functions

- QRadioButton ( QWidget * parent = 0 )
- QRadioButton ( const QString & text, QWidget * parent = 0 )

- 21 public functions inherited from QAbstractButton
- 195 public functions inherited from QWidget
- 29 public functions inherited from QObject
- 12 public functions inherited from QPaintDevice

### Additional Inherited Members

- 11 properties inherited from QAbstractButton
- 55 properties inherited from QWidget
- 1 property inherited from QObject
- 5 public slots inherited from QAbstractButton
- 19 public slots inherited from QWidget
- 1 public slot inherited from QObject
- 4 signals inherited from QAbstractButton
- 1 signal inherited from QWidget
- 1 signal inherited from QObject
- 4 static public members inherited from QWidget
- 5 static public members inherited from QObject
- 3 protected functions inherited from QAbstractButton
- 38 protected functions inherited from QWidget
- 7 protected functions inherited from QObject
- 1 protected function inherited from QPaintDevice
- 1 protected slot inherited from QWidget

## Detailed Description

The QRadioButton widget provides a radio button with a text label.

A QRadioButton is an option button that can be switched on (checked) or off (unchecked). Radio buttons typically present the user with a "one of many" choice. In a group of radio buttons only one radio button at a time can be checked; if the user selects another button, the previously selected button is switched off.

Radio buttons are autoExclusive by default. If auto-exclusive is enabled, radio buttons that belong to the same parent widget behave as if they were part of the same exclusive button group. If you need multiple exclusive button groups for radio buttons that belong to the same parent widget, put them into a QButtonGroup.

Whenever a button is switched on or off it emits the toggled() signal. Connect to this signal if you want to trigger an action each time the button changes state. Use isChecked() to see if a particular button is selected.

Just like QPushButton, a radio button displays text, and optionally a small icon. The text can be set in the constructor or with setText(); the icon is set with setIcon().

Important inherited members: text(), setText(), text(), setDown(), isDown(), autoRepeat(), group(), setAutoRepeat(), toggle(), pressed(), released(), clicked(), and toggled().

| A radio button shown in the Plastique widget style.
| A radio button shown in the Windows XP widget style.
| A radio button shown in the Macintosh widget style.

See also QPushButton, QToolButton, QCheckBox, GUI Design Handbook: Radio Button, and Group Box Example.

## Member Function Documentation

### QRadioButton::QRadioButton ( QWidget * parent = 0 )

Constructs a radio button with the given parent, but with no text or pixmap.

The parent argument is passed on to the QAbstractButton constructor.

### QRadioButton::QRadioButton ( const QString & text, QWidget * parent = 0 )

Constructs a radio button with the given parent and a text string.

The parent argument is passed on to the QAbstractButton constructor.

## Member Function Documentation

### QRadioButton::QRadioButton ( QWidget * parent, const char * name )

Use one of the constructors that doesn't take the name argument and then use setObjectName() instead.

### QRadioButton::QRadioButton ( const QString & text, QWidget * parent, const char * name )

Use one of the constructors that doesn't take the name argument and then use setObjectName() instead.