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RedHat 9 (Linux i386) - man page for qsignal (redhat section 3qt)

QSignal(3qt)									     QSignal(3qt)

NAME
       QSignal - Can be used to send signals for classes that don't inherit QObject

SYNOPSIS
       #include <qsignal.h>

       Inherits QObject.

   Public Members
       QSignal ( QObject * parent = 0, const char * name = 0 )
       ~QSignal ()
       bool connect ( const QObject * receiver, const char * member )
       bool disconnect ( const QObject * receiver, const char * member = 0 )
       void activate ()
       bool isBlocked () const	(obsolete)
       void block ( bool b )  (obsolete)
       void setParameter ( int value )	(obsolete)
       int parameter () const  (obsolete)
       void setValue ( const QVariant & value )
       QVariant value () const

DESCRIPTION
       The QSignal class can be used to send signals for classes that don't inherit QObject.

       If you want to send signals from a class that does not inherit QObject, you can create an
       internal QSignal object to emit the signal. You must also provide a function that connects
       the signal to an outside object slot. This is how we have implemented signals in the
       QMenuData class, which is not a QObject.

       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 private base class of QSignal, i.e. you cannot call any QObject
       member functions from a QSignal object.

       Example:

	       #include <qsignal.h>
	       class MyClass
	       {
	       public:
		   MyClass();
		   ~MyClass();
		   void doSomething();
		   void connect( QObject *receiver, const char *member );
	       private:
		   QSignal *sig;
	       };
	       MyClass::MyClass()
	       {
		   sig = new QSignal;
	       }
	       MyClass::~MyClass()
	       {
		   delete sig;
	       }
	       void MyClass::doSomething()
	       {
		   // ... does something
		   sig->activate(); // emits the signal
	       }
	       void MyClass::connect( QObject *receiver, const char *member )
	       {
		   sig->connect( receiver, member );
	       }

       See also Input/Output and Networking and Miscellaneous Classes.

MEMBER FUNCTION DOCUMENTATION
QSignal::QSignal ( QObject * parent = 0, const char * name = 0 )
       Constructs a signal object called name, with the parent object parent. These arguments are
       passed directly to QObject.

QSignal::~QSignal ()
       Destroys the signal. All connections are removed, as is the case with all QObjects.

void QSignal::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 QSignal::block ( bool b )
       This function is obsolete. It is provided to keep old source working. We strongly advise
       against using it in new code.

       Blocks the signal if b is TRUE, or unblocks the signal if b is FALSE.

       An activated signal disappears into hyperspace if it is blocked.

       See also isBlocked(), activate(), and QObject::blockSignals().

bool QSignal::connect ( const QObject * receiver, const char * member )
       Connects the signal to member in object receiver.

       See also disconnect() and QObject::connect().

bool QSignal::disconnect ( const QObject * receiver, const char * member = 0 )
       Disonnects the signal from member in object receiver.

       See also connect() and QObject::disconnect().

bool QSignal::isBlocked () const
       This function is obsolete. It is provided to keep old source working. We strongly advise
       against using it in new code.

       Returns TRUE if the signal is blocked, or FALSE if it is not blocked.

       The signal is not blocked by default.

       See also block() and QObject::signalsBlocked().

int QSignal::parameter () const
       This function is obsolete. It is provided to keep old source working. We strongly advise
       against using it in new code.

void QSignal::setParameter ( int value )
       This function is obsolete. It is provided to keep old source working. We strongly advise
       against using it in new code.

void QSignal::setValue ( const QVariant & value )
       Sets the signal's parameter to value

QVariant QSignal::value () const
       Returns the signal's parameter

SEE ALSO
       http://doc.trolltech.com/qsignal.html http://www.trolltech.com/faq/tech.html

COPYRIGHT
       Copyright 1992-2001 Trolltech AS, http://www.trolltech.com.  See the license file included
       in the distribution for a complete license statement.

AUTHOR
       Generated automatically from the source code.

BUGS
       If you find a bug in Qt, please report it as described in
       http://doc.trolltech.com/bughowto.html.	Good bug reports help us to help you. Thank you.

       The definitive Qt documentation is provided in HTML format; it is located at
       $QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is
       provided as a convenience for those users who prefer man pages, although this format is
       not officially supported by Trolltech.

       If you find errors in this manual page, please report them to qt-bugs@trolltech.com.
       Please include the name of the manual page (qsignal.3qt) and the Qt version (3.1.1).

Trolltech AS				 9 December 2002			     QSignal(3qt)


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