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QButtonGroup Class Reference
^{[QtGui module]}

The QButtonGroup class provides a container to organize groups of button widgets. More...

#include <QButtonGroup>

Inherits QObject.

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

Properties

• exclusive : bool

• 1 property inherited from QObject

Public Functions

• QButtonGroup ( QObject * parent = 0 )
• ~QButtonGroup ()
• void addButton ( QAbstractButton * )
• void addButton ( QAbstractButton * button, int id )
• QAbstractButton * button ( int id ) const
• QList<QAbstractButton *> buttons () const
• QAbstractButton * checkedButton () const
• int checkedId () const
• bool exclusive () const
• int id ( QAbstractButton * button ) const
• void removeButton ( QAbstractButton * button )
• void setExclusive ( bool )
• void setId ( QAbstractButton * button, int id )

• 28 public functions inherited from QObject

Signals

• void buttonClicked ( QAbstractButton * button )
• void buttonClicked ( int id )

• 1 signal inherited from QObject

Additional Inherited Members

• 1 public slot inherited from QObject
• 4 static public members inherited from QObject
• 7 protected functions inherited from QObject

Detailed Description

The QButtonGroup class provides a container to organize groups of button widgets.

QButtonGroup provides an abstract container into which button widgets can be placed. It does not provide a visual representation of this container (see QGroupBox for a container widget), but instead manages the states of each of the buttons in the group.

An exclusive button group switches off all checkable (toggle) buttons except the one that was clicked. By default, a button group is exclusive. The buttons in a button group are usually checkable QPushButton's, QCheckBoxes (normally for non-exclusive button groups), or QRadioButtons.

A button is added to the group with addButton(). It can be removed from the group with removeButton(). If the group is exclusive, the currently checked button is available as checkedButton(). If a button is clicked the buttonClicked() signal is emitted. For a checkable button in an exclusive group this means that the button was checked. The list of buttons in the group is returned by buttons().

In addition, QButtonGroup can map between integers and buttons. You can assign an integer id to a button with setId(), and retrieve it with id(). The id of the currently checked button is available with checkedId(), and there is an overloaded signal buttonClicked() which emits the id of the button. The purpose of the mapping mechanism is to simply the representation of enum values in a user interface.

See also QGroupBox, QPushButton, QCheckBox, and QRadioButton.

Property Documentation

exclusive : bool

This property holds whether the button group is exclusive.

If this property is true, then the buttons in the group are checked (toggled), and to untoggle a button you must click on another button in the group. The default value is true.

Access functions:

• bool exclusive () const
• void setExclusive ( bool )

Member Function Documentation

QButtonGroup::QButtonGroup ( QObject * parent = 0 )

Constructs a new, empty button group with the given parent.

See also addButton() and setExclusive().

QButtonGroup::~QButtonGroup ()

Destroys the button group.

void QButtonGroup::addButton ( QAbstractButton * )

void QButtonGroup::addButton ( QAbstractButton * button, int id )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Adds the given button to the button group, with the given id.

See also removeButton() and buttons().

QAbstractButton * QButtonGroup::button ( int id ) const

Returns the button with the specified id, or 0 if no such button exists.

This function was introduced in Qt 4.1.

void QButtonGroup::buttonClicked ( QAbstractButton * button )   [signal]

This signal is emitted when the given button is clicked.

See also checkedButton() and QAbstractButton::clicked().

void QButtonGroup::buttonClicked ( int id )   [signal]

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

This signal is emitted when a button with the given id is clicked.

See also checkedButton() and QAbstractButton::clicked().

QList<QAbstractButton *> QButtonGroup::buttons () const

Returns the list of this groups's buttons. This may be empty.

See also addButton() and removeButton().

QAbstractButton * QButtonGroup::checkedButton () const

Returns the button group's checked button, or 0 if no buttons are checked.

See also buttonClicked().

int QButtonGroup::checkedId () const

Returns the id of the checkedButton(), or -1 if no button is checked.

This function was introduced in Qt 4.1.

See also setId().

int QButtonGroup::id ( QAbstractButton * button ) const

Returns the id for the specified button, or -1 if no such button exists.

This function was introduced in Qt 4.1.

See also setId().

void QButtonGroup::removeButton ( QAbstractButton * button )

Removes the given button from the button group.

See also addButton() and buttons().

void QButtonGroup::setId ( QAbstractButton * button, int id )

Sets the id for the specified button.

This function was introduced in Qt 4.1.

See also id().