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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\class QButtonGroup
\brief The QButtonGroup class provides a container to organize groups of
button widgets.
\ingroup organizers
\ingroup geomanagement
\ingroup appearance
\mainclass
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 \l {QButtonGroup::exclusive} {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, \l{QCheckBox}es
(normally for non-exclusive button groups), or \l{QRadioButton}s.
If you create an exclusive button group, you should ensure that
one of the buttons in the group is initially checked; otherwise,
the group will initially be in a state where no buttons are
checked.
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 id \c {-1}
is reserved by QButtonGroup to mean "no such button". The purpose
of the mapping mechanism is to simplify the representation of enum
values in a user interface.
\sa QGroupBox QPushButton, QCheckBox, QRadioButton
*/
/*!
\fn QButtonGroup::QButtonGroup(QObject *parent)
Constructs a new, empty button group with the given \a parent.
\sa addButton() setExclusive()
*/
/*!
\fn QButtonGroup::~QButtonGroup()
Destroys the button group.
*/
/*!
\property QButtonGroup::exclusive
\brief whether the button group is exclusive
If this property is true then only one button in the group can be checked
at any given time. The user can click on any button to check it, and that
button will replace the existing one as the checked button in the group.
In an exclusive group, the user cannot uncheck the currently checked button
by clicking on it; instead, another button in the group must be clicked
to set the new checked button for that group.
By default, this property is true.
*/
/*!
\fn void QButtonGroup::buttonClicked(QAbstractButton *button)
This signal is emitted when the given \a button is clicked. A
button is clicked when it is first pressed and then released, when
its shortcut key is typed, or programmatically when
QAbstractButton::click() or QAbstractButton::animateClick() is
called.
\sa checkedButton(), QAbstractButton::clicked()
*/
/*!
\fn void QButtonGroup::buttonClicked(int id)
This signal is emitted when a button with the given \a id is
clicked.
\sa checkedButton(), QAbstractButton::clicked()
*/
/*!
\fn void QButtonGroup::buttonPressed(QAbstractButton *button)
\since 4.2
This signal is emitted when the given \a button is pressed down.
\sa QAbstractButton::pressed()
*/
/*!
\fn void QButtonGroup::buttonPressed(int id)
\since 4.2
This signal is emitted when a button with the given \a id is
pressed down.
\sa QAbstractButton::pressed()
*/
/*!
\fn void QButtonGroup::buttonReleased(QAbstractButton *button)
\since 4.2
This signal is emitted when the given \a button is released.
\sa QAbstractButton::released()
*/
/*!
\fn void QButtonGroup::buttonReleased(int id)
\since 4.2
This signal is emitted when a button with the given \a id is
released.
\sa QAbstractButton::released()
*/
/*!
\fn void QButtonGroup::addButton(QAbstractButton *button);
Adds the given \a button to the end of the group's internal list
of buttons. An id will be assigned to the button by this
QButtonGroup. Automatically assigned ids are guaranteed to be
negative, starting with -2. If you are also assigning your own
ids, use positive values to avoid conflicts.
\sa removeButton() buttons()
*/
/*!
\fn void QButtonGroup::addButton(QAbstractButton *button, int id);
Adds the given \a button to the button group, with the given
\a id. It is recommended to assign only positive ids.
\sa removeButton() buttons()
*/
/*!
\fn void QButtonGroup::removeButton(QAbstractButton *button);
Removes the given \a button from the button group.
\sa addButton() buttons()
*/
/*!
\fn QList<QAbstractButton*> QButtonGroup::buttons() const
Returns the list of this groups's buttons. This may be empty.
\sa addButton(), removeButton()
*/
/*!
\fn QAbstractButton *QButtonGroup::checkedButton() const;
Returns the button group's checked button, or 0 if no buttons are
checked.
\sa buttonClicked()
*/
/*!
\fn QAbstractButton *QButtonGroup::button(int id) const;
\since 4.1
Returns the button with the specified \a id, or 0 if no such button
exists.
*/
/*!
\fn void QButtonGroup::setId(QAbstractButton *button, int id)
\since 4.1
Sets the \a id for the specified \a button. Note that \a id can
not be -1.
\sa id()
*/
/*!
\fn int QButtonGroup::id(QAbstractButton *button) const;
\since 4.1
Returns the id for the specified \a button, or -1 if no such button
exists.
\sa setId()
*/
/*!
\fn int QButtonGroup::checkedId() const;
\since 4.1
Returns the id of the checkedButton(), or -1 if no button is checked.
\sa setId()
*/
/*! \fn void QButtonGroup::insert(QAbstractButton *b)
Use addButton() instead.
*/
/*! \fn void QButtonGroup::remove(QAbstractButton *b)
Use removeButton() instead.
*/
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