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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>TQAxBindable Class Reference<br><small>[<a href="qaxserver.html">TQAxServer module</a>]</small></h1>
<p>The TQAxBindable class provides an interface between a
TQWidget and an ActiveX client.
<a href="#details">More...</a>
<p>This class is part of the <b>TQt ActiveTQt Extension</b>.
<p><tt>#include <<a href="qaxbindable-h.html">qaxbindable.h</a>></tt>
<p><a href="qaxbindable-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn><a href="#TQAxBindable"><b>TQAxBindable</b></a> ()</li>
<li class=fn>virtual <a href="#~TQAxBindable"><b>~TQAxBindable</b></a> ()</li>
<li class=fn>virtual TQAxAggregated * <a href="#createAggregate"><b>createAggregate</b></a> ()</li>
</ul>
<h2>Static Public Members</h2>
<ul>
<li class=fn>void <a href="#reportError"><b>reportError</b></a> ( int code, const TQString & src, const TQString & desc, const TQString & context = TQString::null )</li>
</ul>
<h2>Protected Members</h2>
<ul>
<li class=fn>bool <a href="#requestPropertyChange"><b>requestPropertyChange</b></a> ( const char * property )</li>
<li class=fn>void <a href="#propertyChanged"><b>propertyChanged</b></a> ( const char * property )</li>
<li class=fn>IUnknown * <a href="#clientSite"><b>clientSite</b></a> () const</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
<p> This class is defined in the <b>TQt <a href="activentqt.html#ActiveTQt">ActiveTQt</a> Extension</b>, which can be found in the <tt>qt/extensions</tt> directory. It is not included in the main TQt API.
<p>
The TQAxBindable class provides an interface between a
<a href="tqwidget.html">TQWidget</a> and an ActiveX client.
<p>
<p> The functions provided by this class allow an ActiveX control to
communicate property changes to a client application. Inherit
your control class from both TQWidget (directly or indirectly) and
this class to get access to this class's functions. The <a href="moc.html">meta object compiler</a> requires you to inherit from
TQWidget <em>first</em>.
<p> <pre>
class MyActiveX : public <a href="tqwidget.html">TQWidget</a>, public TQAxBindable
{
<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
TQ_PROPERTY( int value READ value WRITE setValue )
public:
MyActiveX( <a href="tqwidget.html">TQWidget</a> *parent = 0, const char *name = 0 );
...
int value() const;
void setValue( int );
};
</pre>
<p> When implementing the property write function, use
<a href="#requestPropertyChange">requestPropertyChange</a>() to get permission from the ActiveX client
application to change this property. When the property changes,
call <a href="#propertyChanged">propertyChanged</a>() to notify the ActiveX client application
about the change. If a fatal error occurs in the control, use the
static <a href="#reportError">reportError</a>() function to notify the client.
<p> Use the interface returned by <a href="#clientSite">clientSite</a>() to call the ActiveX
client. To implement additional COM interfaces in your ActiveX
control, reimplement <a href="#createAggregate">createAggregate</a>() to return a new object of a
<a href="qaxaggregated.html">TQAxAggregated</a> subclass.
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="TQAxBindable"></a>TQAxBindable::TQAxBindable ()
</h3>
Constructs an empty TQAxBindable object.
<h3 class=fn><a name="~TQAxBindable"></a>TQAxBindable::~TQAxBindable ()<tt> [virtual]</tt>
</h3>
Destroys the TQAxBindable object.
<h3 class=fn>IUnknown * <a name="clientSite"></a>TQAxBindable::clientSite () const<tt> [protected]</tt>
</h3>
Returns a pointer to the client site interface for this ActiveX object,
or null if no client site has been set.
<p> Call QueryInterface() on the returned interface to get the interface you
want to call.
<h3 class=fn><a href="qaxaggregated.html">TQAxAggregated</a> * <a name="createAggregate"></a>TQAxBindable::createAggregate ()<tt> [virtual]</tt>
</h3>
Reimplement this function when you want to implement additional
COM interfaces in the ActiveX control, or when you want to provide
alternative implementations of COM interfaces. Return a new object
of a <a href="qaxaggregated.html">TQAxAggregated</a> subclass.
<p> The default implementation returns the null pointer.
<h3 class=fn>void <a name="propertyChanged"></a>TQAxBindable::propertyChanged ( const char * property )<tt> [protected]</tt>
</h3>
Call this function to notify the client that is hosting this
ActiveX control that the property <em>property</em> has been changed.
<p> This function is usually called at the end of the property's write
function.
<p> <p>See also <a href="#requestPropertyChange">requestPropertyChange</a>().
<h3 class=fn>void <a name="reportError"></a>TQAxBindable::reportError ( int code, const <a href="ntqstring.html">TQString</a> & src, const <a href="ntqstring.html">TQString</a> & desc, const <a href="ntqstring.html">TQString</a> & context = TQString::null )<tt> [static]</tt>
</h3>
<p> Reports an error to the client application. <em>code</em> is a
control-defined error code. <em>desc</em> is a human-readable description
of the error intended for the application user. <em>src</em> is the name
of the source for the error, typically the ActiveX server name. <em>context</em> can be the location of a help file with more information
about the error. If <em>context</em> ends with a number in brackets,
e.g. [12], this number will be interpreted as the context ID in
the help file.
<h3 class=fn>bool <a name="requestPropertyChange"></a>TQAxBindable::requestPropertyChange ( const char * property )<tt> [protected]</tt>
</h3>
Call this function to request permission to change the property
<em>property</em> from the client that is hosting this ActiveX control.
Returns TRUE if the client allows the change; otherwise returns
FALSE.
<p> This function is usually called first in the write function for <em>property</em>, and writing is abandoned if the function returns FALSE.
<p> <pre>
void MyActiveTQt::setText( const <a href="ntqstring.html">TQString</a> &text )
{
if ( !requestPropertyChange( "text" ) )
return;
// update property
<a href="#propertyChanged">propertyChanged</a>( "text" );
}
</pre>
<p> <p>See also <a href="#propertyChanged">propertyChanged</a>().
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