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< td align = "right" valign = "center" > < img src = "logo32.png" align = "right" width = "64" height = "32" border = "0" > < / td > < / tr > < / table > < h1 align = center > TQSignal Class Reference< / h1 >
< p > The TQSignal class can be used to send signals for classes
that don't inherit TQObject.
< a href = "#details" > More...< / a >
< p > < tt > #include < < a href = "qsignal-h.html" > ntqsignal.h< / a > > < / tt >
< p > Inherits < a href = "tqobject.html" > TQObject< / a > .
< p > < a href = "qsignal-members.html" > List of all member functions.< / a >
< h2 > Public Members< / h2 >
< ul >
< li class = fn > < a href = "#TQSignal" > < b > TQSignal< / b > < / a > ( TQObject * parent = 0, const char * name = 0 )< / li >
< li class = fn > < a href = "#~TQSignal" > < b > ~TQSignal< / b > < / a > ()< / li >
< li class = fn > bool < a href = "#connect" > < b > connect< / b > < / a > ( const TQObject * receiver, const char * member )< / li >
< li class = fn > bool < a href = "#disconnect" > < b > disconnect< / b > < / a > ( const TQObject * receiver, const char * member = 0 )< / li >
< li class = fn > void < a href = "#activate" > < b > activate< / b > < / a > ()< / li >
< li class = fn > void < a href = "#setValue" > < b > setValue< / b > < / a > ( const TQVariant & value )< / li >
< li class = fn > TQVariant < a href = "#value" > < b > value< / b > < / a > () const< / li >
< / ul >
< hr > < a name = "details" > < / a > < h2 > Detailed Description< / h2 >
The TQSignal class can be used to send signals for classes
that don't inherit < a href = "tqobject.html" > TQObject< / a > .
< p >
< p > If you want to send signals from a class that does not inherit
TQObject, you can create an internal TQSignal 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 < a href = "tqmenudata.html" > TQMenuData< / a > class, which is not a TQObject.
< p > In general, we recommend inheriting TQObject instead. TQObject
provides much more functionality.
< p > You can set a single < a href = "ntqvariant.html" > TQVariant< / a > parameter for the signal with
< a href = "#setValue" > setValue< / a > ().
< p > Note that TQObject is a < em > private< / em > base class of TQSignal, i.e. you
cannot call any TQObject member functions from a TQSignal object.
< p > Example:
< pre >
#include < < a href = "qsignal-h.html" > ntqsignal.h< / a > >
class MyClass
{
public:
MyClass();
~MyClass();
void doSomething();
void connect( < a href = "tqobject.html" > TQObject< / a > *receiver, const char *member );
private:
TQSignal *sig;
};
MyClass::MyClass()
{
sig = new TQSignal;
}
MyClass::~MyClass()
{
delete sig;
}
void MyClass::doSomething()
{
// ... does something
sig-> < a href = "#activate" > activate< / a > (); // emits the signal
}
void MyClass::connect( < a href = "tqobject.html" > TQObject< / a > *receiver, const char *member )
{
sig-> < a href = "#connect" > connect< / a > ( receiver, member );
}
< / pre >
< p > See also < a href = "io.html" > Input/Output and Networking< / a > and < a href = "misc.html" > Miscellaneous Classes< / a > .
< hr > < h2 > Member Function Documentation< / h2 >
< h3 class = fn > < a name = "TQSignal" > < / a > TQSignal::TQSignal ( < a href = "tqobject.html" > TQObject< / a > * parent = 0, const char * name = 0 )
< / h3 >
Constructs a signal object called < em > name< / em > , with the parent object
< em > parent< / em > . These arguments are passed directly to < a href = "tqobject.html" > TQObject< / a > .
< h3 class = fn > < a name = "~TQSignal" > < / a > TQSignal::~TQSignal ()
< / h3 >
Destroys the signal. All connections are removed, as is the case
with all TQObjects.
< h3 class = fn > void < a name = "activate" > < / a > TQSignal::activate ()
< / h3 >
< p > Emits the signal. If the platform supports < a href = "ntqvariant.html" > TQVariant< / a > and a
parameter has been set with < a href = "#setValue" > setValue< / a > (), this value is passed in
the signal.
< h3 class = fn > bool < a name = "connect" > < / a > TQSignal::connect ( const < a href = "tqobject.html" > TQObject< / a > * receiver, const char * member )
< / h3 >
Connects the signal to < em > member< / em > in object < em > receiver< / em > .
< p > < p > See also < a href = "#disconnect" > disconnect< / a > () and < a href = "tqobject.html#connect" > TQObject::connect< / a > ().
< h3 class = fn > bool < a name = "disconnect" > < / a > TQSignal::disconnect ( const < a href = "tqobject.html" > TQObject< / a > * receiver, const char * member = 0 )
< / h3 >
Disonnects the signal from < em > member< / em > in object < em > receiver< / em > .
< p > < p > See also < a href = "#connect" > connect< / a > () and < a href = "tqobject.html#disconnect" > TQObject::disconnect< / a > ().
< h3 class = fn > void < a name = "setValue" > < / a > TQSignal::setValue ( const < a href = "ntqvariant.html" > TQVariant< / a > & value )
< / h3 >
Sets the signal's parameter to < em > value< / em >
< h3 class = fn > < a href = "ntqvariant.html" > TQVariant< / a > < a name = "value" > < / a > TQSignal::value () const
< / h3 >
Returns the signal's parameter
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