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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 = "ntqwidget.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 = "ntqwidget.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 = "ntqwidget.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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