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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 Qt3Support 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 http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "q3signal.h"
#include "qmetaobject.h"
#include "qpointer.h"
#include "q3cstring.h"
QT_BEGIN_NAMESPACE
/*!
\class Q3Signal
\brief The Q3Signal class can be used to send signals for classes
that don't inherit QObject.
\compat
If you want to send signals from a class that does not inherit
QObject, you can create an internal Q3Signal object to emit the
signal. You must also provide a function that connects the signal
to an outside object slot. This is how we used to implement
signals in Qt 3's QMenuData class, which was not a QObject. In Qt
4, menus contain actions, which are QObjects.
In general, we recommend inheriting QObject instead. QObject
provides much more functionality.
You can set a single QVariant parameter for the signal with
setValue().
Note that QObject is a \e private base class of Q3Signal, i.e. you
cannot call any QObject member functions from a Q3Signal object.
Example:
\snippet doc/src/snippets/code/src_qt3support_tools_q3signal.cpp 0
*/
/*!
Constructs a signal object called \a name, with the parent object
\a parent. These arguments are passed directly to QObject.
*/
Q3Signal::Q3Signal(QObject *parent, const char *name)
: QObject(parent, name)
{
#ifndef QT_NO_VARIANT
val = 0;
#endif
}
/*!
Destroys the signal. All connections are removed, as is the case
with all QObjects.
*/
Q3Signal::~Q3Signal()
{
}
#ifndef QT_NO_VARIANT
// Returns true if it matches ".+(.*int.*"
static inline bool intSignature(const char *member)
{
Q3CString s(member);
int p = s.find('(');
return p > 0 && p < s.findRev("int");
}
#endif
/*!
Connects the signal to \a member in object \a receiver.
Returns true if the connection is successful.
\sa disconnect(), QObject::connect()
*/
bool Q3Signal::connect(const QObject *receiver, const char *member)
{
#ifndef QT_NO_VARIANT
if (intSignature(member))
#endif
return QObject::connect((QObject *)this, SIGNAL(intSignal(int)), receiver, member);
#ifndef QT_NO_VARIANT
return QObject::connect((QObject *)this, SIGNAL(signal(QVariant)),
receiver, member);
#endif
}
/*!
Disonnects the signal from \a member in object \a receiver.
Returns true if the connection existed and the disconnect
was successful.
\sa connect(), QObject::disconnect()
*/
bool Q3Signal::disconnect(const QObject *receiver, const char *member)
{
if (!member)
return QObject::disconnect((QObject *)this, 0, receiver, member);
#ifndef QT_NO_VARIANT
if (intSignature(member))
#endif
return QObject::disconnect((QObject *)this, SIGNAL(intSignal(int)), receiver, member);
#ifndef QT_NO_VARIANT
return QObject::disconnect((QObject *)this, SIGNAL(signal(QVariant)),
receiver, member);
#endif
}
/*!
\fn bool Q3Signal::isBlocked() const
\obsolete
Returns true if the signal is blocked, or false if it is not blocked.
The signal is not blocked by default.
\sa block(), QObject::signalsBlocked()
*/
/*!
\fn void Q3Signal::block(bool b)
\obsolete
Blocks the signal if \a b is true, or unblocks the signal if \a b is false.
An activated signal disappears into hyperspace if it is blocked.
\sa isBlocked(), activate(), QObject::blockSignals()
*/
/*!
\fn void Q3Signal::activate()
Emits the signal. If the platform supports QVariant and a
parameter has been set with setValue(), this value is passed in
the signal.
*/
void Q3Signal::activate()
{
#ifndef QT_NO_VARIANT
/* Create this Q3GuardedPtr on this, if we get destroyed after the intSignal (but before the variant signal)
we cannot just emit the signal (because val has been destroyed already) */
QPointer<Q3Signal> me = this;
if(me)
emit intSignal(val.toInt());
if(me)
emit signal(val);
#else
emit intSignal(0);
#endif
}
#ifndef QT_NO_VARIANT
/*!
Sets the signal's parameter to \a value
*/
void Q3Signal::setValue(const QVariant &value)
{
val = value;
}
/*!
Returns the signal's parameter
*/
QVariant Q3Signal::value() const
{
return val;
}
/*! \fn void Q3Signal::signal(const QVariant &)
\internal
*/
/*! \fn void Q3Signal::intSignal(int)
\internal
*/
/*! \obsolete */
void Q3Signal::setParameter(int value)
{
val = value;
}
/*! \obsolete */
int Q3Signal::parameter() const
{
return val.toInt();
}
#endif //QT_NO_VARIANT
QT_END_NAMESPACE
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