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Referencia de la Clase QSignal

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

#include <qsignal.h>

Diagrama de herencias de QSignal
QObject QObject Qt Qt Qt Qt

Lista de todos los miembros.

Señales

void signal (const QVariant &)
void intSignal (int)
void signal (const QVariant &)
void intSignal (int)

Métodos públicos

 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
void block (bool b)
void setParameter (int value)
int parameter () const
void setValue (const QVariant &value)
QVariant value () const
 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
void block (bool b)
void setParameter (int value)
int parameter () const
void setValue (const QVariant &value)
QVariant value () const

Descripción detallada

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 );
        }

Documentación del constructor y destructor

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.

QSignal::QSignal ( QObject parent = 0,
const char *  name = 0 
)
QSignal::~QSignal ( )

Documentación de las funciones miembro

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::activate ( )
void QSignal::block ( bool  b) [inline]

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.

Ver también:
isBlocked(), activate(), QObject::blockSignals()
void QSignal::block ( bool  b) [inline]
bool QSignal::connect ( const QObject receiver,
const char *  member 
)
bool QSignal::connect ( const QObject receiver,
const char *  member 
)

Connects the signal to member in object receiver.

Ver también:
disconnect(), QObject::connect()
bool QSignal::disconnect ( const QObject receiver,
const char *  member = 0 
)

Disonnects the signal from member in object receiver.

Ver también:
connect(), QObject::disconnect()

Reimplementado de QObject.

bool QSignal::disconnect ( const QObject receiver,
const char *  member = 0 
)

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta.

Disconnects all signals in this object from receiver's member.

A signal-slot connection is removed when either of the objects involved are destroyed.

Reimplementado de QObject.

void QSignal::intSignal ( int  t0) [signal]
void QSignal::intSignal ( int  ) [signal]
bool QSignal::isBlocked ( ) const [inline]

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

The signal is not blocked by default.

Ver también:
block(), QObject::signalsBlocked()
bool QSignal::isBlocked ( ) const [inline]
int QSignal::parameter ( ) const
int QSignal::parameter ( ) const
void QSignal::setParameter ( int  value)
void QSignal::setParameter ( int  value)
void QSignal::setValue ( const QVariant value)
void QSignal::setValue ( const QVariant value)

Sets the signal's parameter to value

void QSignal::signal ( const QVariant ) [signal]
void QSignal::signal ( const QVariant t0) [signal]
QVariant QSignal::value ( ) const
QVariant QSignal::value ( ) const

Returns the signal's parameter


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