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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation 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 http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\class QSignalSpy
\inmodule QtTest
\brief The QSignalSpy class enables introspection of signal emission.
QSignalSpy can connect to any signal of any object and records its emission.
QSignalSpy itself is a list of QVariant lists. Each emission of the signal
will append one item to the list, containing the arguments of the signal.
The following example records all signal emissions for the \c clicked() signal
of a QCheckBox:
\snippet doc/src/snippets/code/doc_src_qsignalspy.qdoc 0
\c{spy.takeFirst()} returns the arguments for the first emitted signal, as a
list of QVariant objects. The \c clicked() signal has a single bool argument,
which is stored as the first entry in the list of arguments.
The example below catches a signal from a custom object:
\snippet doc/src/snippets/code/doc_src_qsignalspy.qdoc 1
\bold {Note:} Non-standard data types need to be registered, using
the qRegisterMetaType() function, before you can create a
QSignalSpy. For example:
\snippet doc/src/snippets/code/doc_src_qsignalspy.qdoc 2
To retrieve the \c QModelIndex, you can use qvariant_cast:
\snippet doc/src/snippets/code/doc_src_qsignalspy.qdoc 3
*/
/*! \fn QSignalSpy::QSignalSpy(QObject *object, const char *signal)
Constructs a new QSignalSpy that listens for emissions of the \a signal
from the QObject \a object. Neither \a signal nor \a object can be null.
Example:
\snippet doc/src/snippets/code/doc_src_qsignalspy.qdoc 4
*/
/*! \fn QSignalSpy::isValid() const
Returns true if the signal spy listens to a valid signal, otherwise false.
*/
/*! \fn QSignalSpy::signal() const
Returns the normalized signal the spy is currently listening to.
*/
/*! \fn int QSignalSpy::qt_metacall(QMetaObject::Call call, int id, void **a)
\internal
*/
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