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84 lines
3 KiB
Text
84 lines
3 KiB
Text
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the documentation of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:FDL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Free Documentation License Usage
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** Alternatively, this file may be used under the terms of the GNU Free
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** Documentation License version 1.3 as published by the Free Software
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** Foundation and appearing in the file included in the packaging of
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** this file. Please review the following information to ensure
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** the GNU Free Documentation License version 1.3 requirements
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** will be met: http://www.gnu.org/copyleft/fdl.html.
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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/*!
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\class QSignalSpy
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\inmodule QtTest
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\brief The QSignalSpy class enables introspection of signal emission.
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QSignalSpy can connect to any signal of any object and records its emission.
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QSignalSpy itself is a list of QVariant lists. Each emission of the signal
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will append one item to the list, containing the arguments of the signal.
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The following example records all signal emissions for the \c clicked() signal
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of a QCheckBox:
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\snippet doc/src/snippets/code/doc_src_qsignalspy.cpp 0
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\c{spy.takeFirst()} returns the arguments for the first emitted signal, as a
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list of QVariant objects. The \c clicked() signal has a single bool argument,
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which is stored as the first entry in the list of arguments.
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The example below catches a signal from a custom object:
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\snippet doc/src/snippets/code/doc_src_qsignalspy.cpp 1
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\bold {Note:} Non-standard data types need to be registered, using
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the qRegisterMetaType() function, before you can create a
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QSignalSpy. For example:
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\snippet doc/src/snippets/code/doc_src_qsignalspy.cpp 2
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To retrieve the \c QModelIndex, you can use qvariant_cast:
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\snippet doc/src/snippets/code/doc_src_qsignalspy.cpp 3
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*/
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/*! \fn QSignalSpy::QSignalSpy(QObject *object, const char *signal)
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Constructs a new QSignalSpy that listens for emissions of the \a signal
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from the QObject \a object. Neither \a signal nor \a object can be null.
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Example:
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\snippet doc/src/snippets/code/doc_src_qsignalspy.cpp 4
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*/
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/*! \fn QSignalSpy::isValid() const
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Returns true if the signal spy listens to a valid signal, otherwise false.
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*/
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/*! \fn QSignalSpy::signal() const
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Returns the normalized signal the spy is currently listening to.
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*/
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/*! \fn int QSignalSpy::qt_metacall(QMetaObject::Call call, int id, void **a)
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\internal
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*/
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