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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** GNU Free Documentation License
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms
** and conditions contained in a signed written agreement between you
** and Nokia.
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\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.cpp 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.cpp 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.cpp 2
To retrieve the \c QModelIndex, you can use qvariant_cast:
\snippet doc/src/snippets/code/doc_src_qsignalspy.cpp 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.cpp 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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