/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the Qt3Support module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "q3signal.h"+
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#include "qmetaobject.h"+
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#include "qpointer.h"+
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#include "q3cstring.h"+
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+
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QT_BEGIN_NAMESPACE+
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+
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/*!+
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    \class Q3Signal+
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    \brief The Q3Signal class can be used to send signals for classes+
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    that don't inherit QObject.+
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+
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    \compat+
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+
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    If you want to send signals from a class that does not inherit+
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    QObject, you can create an internal Q3Signal object to emit the+
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    signal. You must also provide a function that connects the signal+
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    to an outside object slot.  This is how we used to implement+
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    signals in Qt 3's QMenuData class, which was not a QObject. In Qt+
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    4, menus contain actions, which are QObjects.+
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+
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    In general, we recommend inheriting QObject instead. QObject+
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    provides much more functionality.+
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+
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    You can set a single QVariant parameter for the signal with+
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    setValue().+
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+
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    Note that QObject is a \e private base class of Q3Signal, i.e. you+
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    cannot call any QObject member functions from a Q3Signal object.+
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+
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    Example:+
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    \snippet doc/src/snippets/code/src_qt3support_tools_q3signal.cpp 0+
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*/+
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+
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/*!+
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    Constructs a signal object called \a name, with the parent object+
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    \a parent. These arguments are passed directly to QObject.+
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*/+
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+
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Q3Signal::Q3Signal(QObject *parent, const char *name)+
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    : QObject(parent, name)+
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{+
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#ifndef QT_NO_VARIANT+
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    val = 0;+
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#endif+
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}+
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+
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/*!+
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    Destroys the signal. All connections are removed, as is the case+
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    with all QObjects.+
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*/+
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Q3Signal::~Q3Signal()+
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{+
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}+
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#ifndef QT_NO_VARIANT+
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// Returns true if it matches ".+(.*int.*"+
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static inline bool intSignature(const char *member)+
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{+
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    Q3CString s(member);+
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    int p = s.find('(');+
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    return p > 0 && p < s.findRev("int");+
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}+
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#endif+
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/*!+
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    Connects the signal to \a member in object \a receiver.+
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    Returns true if the connection is successful.+
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+
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    \sa disconnect(), QObject::connect()+
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*/+
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+
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bool Q3Signal::connect(const QObject *receiver, const char *member)+
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{+
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#ifndef QT_NO_VARIANT+
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    if (intSignature(member))+
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#endif+
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	return QObject::connect((QObject *)this, SIGNAL(intSignal(int)), receiver, member);+
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#ifndef QT_NO_VARIANT+
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    return QObject::connect((QObject *)this, SIGNAL(signal(QVariant)),+
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			     receiver, member);+
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#endif+
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}+
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+
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/*!+
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    Disonnects the signal from \a member in object \a receiver.+
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    Returns true if the connection existed and the disconnect+
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    was successful.+
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+
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    \sa connect(), QObject::disconnect()+
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*/+
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+
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bool Q3Signal::disconnect(const QObject *receiver, const char *member)+
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{+
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    if (!member)+
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	return QObject::disconnect((QObject *)this, 0, receiver, member);+
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#ifndef QT_NO_VARIANT+
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    if (intSignature(member))+
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#endif+
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	return QObject::disconnect((QObject *)this, SIGNAL(intSignal(int)), receiver, member);+
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#ifndef QT_NO_VARIANT+
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    return QObject::disconnect((QObject *)this, SIGNAL(signal(QVariant)),+
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				receiver, member);+
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#endif+
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}+
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+
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+
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/*!+
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  \fn bool Q3Signal::isBlocked() const+
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  \obsolete+
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  Returns true if the signal is blocked, or false if it is not blocked.+
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+
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  The signal is not blocked by default.+
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+
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  \sa block(), QObject::signalsBlocked()+
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*/+
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+
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/*!+
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  \fn void Q3Signal::block(bool b)+
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  \obsolete+
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  Blocks the signal if \a b is true, or unblocks the signal if \a b is false.+
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+
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  An activated signal disappears into hyperspace if it is blocked.+
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+
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  \sa isBlocked(), activate(), QObject::blockSignals()+
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*/+
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+
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+
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/*!+
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    \fn void Q3Signal::activate()+
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+
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    Emits the signal. If the platform supports QVariant and a+
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    parameter has been set with setValue(), this value is passed in+
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    the signal.+
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*/+
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void  Q3Signal::activate()+
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{+
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#ifndef QT_NO_VARIANT+
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    /* Create this Q3GuardedPtr on this, if we get destroyed after the intSignal (but before the variant signal)+
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       we cannot just emit the signal (because val has been destroyed already) */+
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    QPointer<Q3Signal> me = this;+
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    if(me)+
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	emit intSignal(val.toInt());+
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    if(me)+
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	emit signal(val);+
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#else+
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    emit intSignal(0);+
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#endif+
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}+
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+
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#ifndef QT_NO_VARIANT+
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/*!+
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    Sets the signal's parameter to \a value+
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*/+
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void Q3Signal::setValue(const QVariant &value)+
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{+
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    val = value;+
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}+
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+
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/*!+
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    Returns the signal's parameter+
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*/+
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QVariant Q3Signal::value() const+
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{+
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    return val;+
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}+
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/*! \fn void Q3Signal::signal(const QVariant &)+
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    \internal+
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*/+
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/*! \fn void Q3Signal::intSignal(int)+
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    \internal+
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*/+
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+
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/*! \obsolete */+
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void Q3Signal::setParameter(int value)+
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{+
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    val = value;+
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}+
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+
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/*! \obsolete */+
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int Q3Signal::parameter() const+
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{+
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    return val.toInt();+
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}+
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#endif //QT_NO_VARIANT+
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+
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QT_END_NAMESPACE+
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