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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<h1 align=center>QSignal Class Reference</h1><br clear="all">
<p>
The QSignal class can be used to send signals without parameters.
<a href="#details">More...</a>
<p>
<code>#include <<a href="qsignal-h.html">qsignal.h</a>></code>
<p><a href="qsignal-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><div class="fn"><a href="#5d5636"><b>QSignal</b></a>(QObject*parent=0, constchar*name=0)</div>
<li><div class="fn"><a href="#f37d61"><b>~QSignal</b></a>()</div>
<li><div class="fn">constchar*<a href="#599025"><b>name</b></a>()const</div>
<li><div class="fn">virtualvoid<a href="#5e96d5"><b>setName</b></a>(constchar*name)</div>
<li><div class="fn">bool<a href="#50f483"><b>connect</b></a>(constQObject*receiver, constchar*member)</div>
<li><div class="fn">bool<a href="#8e558a"><b>disconnect</b></a>(constQObject*receiver, constchar*member=0)</div>
<li><div class="fn">bool<a href="#cd8c57"><b>isBlocked</b></a>()const</div>
<li><div class="fn">void<a href="#8f5269"><b>block</b></a>(boolb)</div>
<li><div class="fn">void<a href="#6d4413"><b>activate</b></a>()</div>
<li><div class="fn">void<a href="#43033f"><b>setParameter</b></a>(intvalue)</div>
<li><div class="fn">int<a href="#c639aa"><b>parameter</b></a>()const</div>
</ul>
<hr><h2><a name="details"></a>Detailed Description</h2>
The QSignal class can be used to send signals without parameters.
<p>
QSignal is a simple extension of <a href="qobject.html">QObject</a> that can send plain signals
without parameters. 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
<a href="qmenudata.html">QMenuData</a> class, which is not a QObject.
<p>In general, we recommend inheriting QObject instead. QObject provides
much more functionality.
<p>Note that QObject is a <em>private</em> base class of QSignal, i.e. you cannot
call any QObject member functions from a QSignal object.
<p>Example:
<pre> #include <qsignal.h>
class MyClass
{
public:
MyClass();
~MyClass();
void doSomething();
void connect( <a href="qobject.html">QObject</a> *receiver, const char *member );
private:
<a href="qsignal.html">QSignal</a> *sig;
};
MyClass::MyClass()
{
sig = new <a href="qsignal.html">QSignal</a>;
}
MyClass::~MyClass()
{
delete sig;
}
void MyClass::doSomething()
{
// ... does something
sig-><a href="#6d4413">activate</a>(); // activates the signal
}
void MyClass::connect( <a href="qobject.html">QObject</a> *receiver, const char *member )
{
sig-><a href="#50f483">connect</a>( receiver, member );
}
</pre>
<hr><h2>Member Function Documentation</h2>
<h3 class="fn"><a name="5d5636"></a>QSignal::QSignal(<a href="qobject.html">QObject</a>*parent=0, constchar*name=0)</h3>
<p>Constructs a signal object with the parent object <em>parent</em> and a <em>name.</em>
These arguments are passed directly to <a href="qobject.html">QObject</a>.
<h3 class="fn"><a name="f37d61"></a>QSignal::~QSignal()</h3>
<p>Destructs the signal. All connections are removed, as is the case
with all QObjects.
<h3 class="fn">void<a name="6d4413"></a>QSignal::activate()</h3>
<p>Emits the signal.
<p>See also <a href="#cd8c57">isBlocked</a>().
<h3 class="fn">void<a name="8f5269"></a>QSignal::block(boolb)</h3>
<p>Blocks the signal if <em>b</em> is TRUE, or unblocks the signal if <em>b</em> is FALSE.
<p>An activated signal disappears into hyperspace if it is blocked.
<p>See also <a href="#cd8c57">isBlocked</a>(), <a href="#6d4413">activate</a>() and <a href="qobject.html#03d9ac">QObject::blockSignals</a>().
<h3 class="fn">bool<a name="50f483"></a>QSignal::connect(const<a href="qobject.html">QObject</a>*receiver, constchar*member)</h3>
<p>Connects the signal to <em>member</em> in object <em>receiver.</em>
<p>See also <a href="#8e558a">disconnect</a>() and <a href="qobject.html#7f8e37">QObject::connect</a>().
<h3 class="fn">bool<a name="8e558a"></a>QSignal::disconnect(const<a href="qobject.html">QObject</a>*receiver, constchar*member=0)</h3>
<p>Disonnects the signal from <em>member</em> in object <em>receiver.</em>
<p>See also <a href="#50f483">connect</a>() and <a href="qobject.html#3ca0ec">QObject::disconnect</a>().
<h3 class="fn">bool<a name="cd8c57"></a>QSignal::isBlocked()const</h3>
<p>Returns TRUE if the signal is blocked, or FALSE if it is not blocked.
<p>The signal is not blocked by default.
<p>See also <a href="#8f5269">block</a>() and <a href="qobject.html#d714f8">QObject::signalsBlocked</a>().
<h3 class="fn">constchar*<a name="599025"></a>QSignal::name()const</h3>
<p>Returns the name of this signal object.
<p>Since <a href="qobject.html">QObject</a> is a private base class, we have added this function, which
calls <a href="qobject.html#53d9cc">QObject::name</a>().
<h3 class="fn">int<a name="c639aa"></a>QSignal::parameter()const</h3>
<p>Returns the signal's parameter.
<h3 class="fn">void<a name="5e96d5"></a>QSignal::setName(constchar*name) <code>[virtual]</code></h3>
<p>Sets the name of this signal object to <em>name.</em>
<p>Since <a href="qobject.html">QObject</a> is a private base class, we have added this function, which
calls <a href="qobject.html#ceac81">QObject::setName</a>().
<p>Reimplemented from <a href="qobject.html#ceac81">QObject.</a>
<h3 class="fn">void<a name="43033f"></a>QSignal::setParameter(intvalue)</h3>
<p>Sets the signal's parameter to <em>value</em>
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