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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>TQSignal Class</title>
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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="tqsignal-h.html">tqsignal.h</a>></tt>
<p>Inherits <a href="tqobject.html">TQObject</a>.
<p><a href="tqsignal-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="tqvariant.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="tqsignal-h.html">tqsignal.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="tqvariant.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="tqvariant.html">TQVariant</a> & value )
</h3>
Sets the signal's parameter to <em>value</em>
<h3 class=fn><a href="tqvariant.html">TQVariant</a> <a name="value"></a>TQSignal::value () const
</h3>
Returns the signal's parameter
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