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170 lines
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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>
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<p>The TQAxBindable class provides an interface between a
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TQWidget and an ActiveX client.
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<a href="#details">More...</a>
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<p>This class is part of the <b>TQt ActiveTQt Extension</b>.
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<p><tt>#include <<a href="qaxbindable-h.html">qaxbindable.h</a>></tt>
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<p><a href="qaxbindable-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#TQAxBindable"><b>TQAxBindable</b></a> ()</li>
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<li class=fn>virtual <a href="#~TQAxBindable"><b>~TQAxBindable</b></a> ()</li>
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<li class=fn>virtual TQAxAggregated * <a href="#createAggregate"><b>createAggregate</b></a> ()</li>
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</ul>
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<h2>Static Public Members</h2>
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<ul>
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<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>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn>bool <a href="#requestPropertyChange"><b>requestPropertyChange</b></a> ( const char * property )</li>
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<li class=fn>void <a href="#propertyChanged"><b>propertyChanged</b></a> ( const char * property )</li>
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<li class=fn>IUnknown * <a href="#clientSite"><b>clientSite</b></a> () const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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<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.
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<p>
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The TQAxBindable class provides an interface between a
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<a href="ntqwidget.html">TQWidget</a> and an ActiveX client.
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<p>
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<p> The functions provided by this class allow an ActiveX control to
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communicate property changes to a client application. Inherit
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your control class from both TQWidget (directly or indirectly) and
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this class to get access to this class's functions. The <a href="moc.html">meta object compiler</a> requires you to inherit from
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TQWidget <em>first</em>.
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<p> <pre>
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class MyActiveX : public <a href="ntqwidget.html">TQWidget</a>, public TQAxBindable
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{
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<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
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TQ_PROPERTY( int value READ value WRITE setValue )
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public:
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MyActiveX( <a href="ntqwidget.html">TQWidget</a> *parent = 0, const char *name = 0 );
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...
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int value() const;
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void setValue( int );
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};
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</pre>
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<p> When implementing the property write function, use
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<a href="#requestPropertyChange">requestPropertyChange</a>() to get permission from the ActiveX client
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application to change this property. When the property changes,
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call <a href="#propertyChanged">propertyChanged</a>() to notify the ActiveX client application
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about the change. If a fatal error occurs in the control, use the
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static <a href="#reportError">reportError</a>() function to notify the client.
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<p> Use the interface returned by <a href="#clientSite">clientSite</a>() to call the ActiveX
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client. To implement additional COM interfaces in your ActiveX
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control, reimplement <a href="#createAggregate">createAggregate</a>() to return a new object of a
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<a href="qaxaggregated.html">TQAxAggregated</a> subclass.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQAxBindable"></a>TQAxBindable::TQAxBindable ()
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</h3>
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Constructs an empty TQAxBindable object.
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<h3 class=fn><a name="~TQAxBindable"></a>TQAxBindable::~TQAxBindable ()<tt> [virtual]</tt>
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</h3>
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Destroys the TQAxBindable object.
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<h3 class=fn>IUnknown * <a name="clientSite"></a>TQAxBindable::clientSite () const<tt> [protected]</tt>
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</h3>
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Returns a pointer to the client site interface for this ActiveX object,
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or null if no client site has been set.
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<p> Call QueryInterface() on the returned interface to get the interface you
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want to call.
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<h3 class=fn><a href="qaxaggregated.html">TQAxAggregated</a> * <a name="createAggregate"></a>TQAxBindable::createAggregate ()<tt> [virtual]</tt>
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</h3>
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Reimplement this function when you want to implement additional
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COM interfaces in the ActiveX control, or when you want to provide
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alternative implementations of COM interfaces. Return a new object
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of a <a href="qaxaggregated.html">TQAxAggregated</a> subclass.
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<p> The default implementation returns the null pointer.
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<h3 class=fn>void <a name="propertyChanged"></a>TQAxBindable::propertyChanged ( const char * property )<tt> [protected]</tt>
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</h3>
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Call this function to notify the client that is hosting this
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ActiveX control that the property <em>property</em> has been changed.
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<p> This function is usually called at the end of the property's write
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function.
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<p> <p>See also <a href="#requestPropertyChange">requestPropertyChange</a>().
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<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>
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</h3>
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<p> Reports an error to the client application. <em>code</em> is a
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control-defined error code. <em>desc</em> is a human-readable description
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of the error intended for the application user. <em>src</em> is the name
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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
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about the error. If <em>context</em> ends with a number in brackets,
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e.g. [12], this number will be interpreted as the context ID in
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the help file.
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<h3 class=fn>bool <a name="requestPropertyChange"></a>TQAxBindable::requestPropertyChange ( const char * property )<tt> [protected]</tt>
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</h3>
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Call this function to request permission to change the property
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<em>property</em> from the client that is hosting this ActiveX control.
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Returns TRUE if the client allows the change; otherwise returns
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FALSE.
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<p> This function is usually called first in the write function for <em>property</em>, and writing is abandoned if the function returns FALSE.
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<p> <pre>
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void MyActiveTQt::setText( const <a href="ntqstring.html">TQString</a> &text )
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{
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if ( !requestPropertyChange( "text" ) )
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return;
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// update property
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<a href="#propertyChanged">propertyChanged</a>( "text" );
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}
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</pre>
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<p> <p>See also <a href="#propertyChanged">propertyChanged</a>().
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This file is part of the <a href="index.html">TQt toolkit</a>.
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Copyright © 1995-2007
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<td align=right><div align=right>TQt 3.3.8</div>
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