QSignal(3qt)

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

SYNOPSIS
#include <ntqsignal.h>

Inherits TQObject.

  Public Members
QSignal ( TQObject * parent = 0, const char * name = 0 )
~QSignal ()
bool connect ( const TQObject * receiver, const char * member )
bool disconnect ( const TQObject * receiver, const char * member = 0 )
void activate ()
void setValue ( const QVariant & value )
QVariant value () const

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

If you want to send signals from a class that does not inherit TQObject, 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 TQObject.

In general, we recommend inheriting TQObject instead. TQObject provides much more functionality.

You can set a single QVariant parameter for the signal with setValue().

Note that TQObject is a private base class of QSignal, i.e. you cannot call any TQObject member functions from a QSignal object.

Example:

        #include <ntqsignal.h>
        class MyClass
        {
        public:
            MyClass();
            ~MyClass();
            void doSomething();
            void connect( TQObject *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( TQObject *receiver, const char *member )
        {
            sig->connect( receiver, member );
        }

See also Input/Output and Networking and Miscellaneous Classes.

MEMBER FUNCTION DOCUMENTATION

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

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.

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

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

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

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

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/ntqsignal.html http://www.trolltech.com/faq/tech.html

COPYRIGHT
Copyright 1992-2007 Trolltech ASA, 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 TQt documentation is provided in HTML format; it is located at $TQTDIR/doc/html and can be read using TQt 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 (tqsignal.3qt) and the Qt version (3.3.8).