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** this package.

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****************************************************************************/

#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