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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 > TQCustomEvent Class Reference< / h1 >
< p > The TQCustomEvent class provides support for custom events.
< a href = "#details" > More...< / a >
< p > < tt > #include < < a href = "qevent-h.html" > ntqevent.h< / a > > < / tt >
< p > Inherits < a href = "ntqevent.html" > TQEvent< / a > .
< p > < a href = "qcustomevent-members.html" > List of all member functions.< / a >
< h2 > Public Members< / h2 >
< ul >
< li class = fn > < a href = "#TQCustomEvent" > < b > TQCustomEvent< / b > < / a > ( int type )< / li >
< li class = fn > < a href = "#TQCustomEvent-2" > < b > TQCustomEvent< / b > < / a > ( Type type, void * data )< / li >
< li class = fn > void * < a href = "#data" > < b > data< / b > < / a > () const< / li >
< li class = fn > void < a href = "#setData" > < b > setData< / b > < / a > ( void * data )< / li >
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< hr > < a name = "details" > < / a > < h2 > Detailed Description< / h2 >
The TQCustomEvent class provides support for custom events.
< p >
< p > TQCustomEvent is a generic event class for user-defined events.
User defined events can be sent to widgets or other < a href = "ntqobject.html" > TQObject< / a >
instances using < a href = "ntqapplication.html#postEvent" > TQApplication::postEvent< / a > () or
< a href = "ntqapplication.html#sendEvent" > TQApplication::sendEvent< / a > (). Subclasses of TQObject can easily
receive custom events by implementing the < a href = "ntqobject.html#customEvent" > TQObject::customEvent< / a > ()
event handler function.
< p > TQCustomEvent objects should be created with a type ID that
uniquely identifies the event type. To avoid clashes with the
TQt-defined events types, the value should be at least as large as
the value of the "User" entry in the TQEvent::Type enum.
< p > TQCustomEvent contains a generic void* data member that may be used
for transferring event-specific data to the receiver. Note that
since events are normally delivered asynchronously, the data
pointer, if used, must remain valid until the event has been
received and processed.
< p > TQCustomEvent can be used as-is for simple user-defined event
types, but normally you will want to make a subclass of it for
your event types. In a subclass, you can add data members that are
suitable for your event type.
< p > Example:
< pre >
class ColorChangeEvent : public TQCustomEvent
{
public:
ColorChangeEvent( < a href = "ntqcolor.html" > TQColor< / a > color )
: TQCustomEvent( 65432 ), c( color ) {}
< a href = "ntqcolor.html" > TQColor< / a > color() const { return c; }
private:
< a href = "ntqcolor.html" > TQColor< / a > c;
};
// To send an event of this custom event type:
ColorChangeEvent* ce = new ColorChangeEvent( blue );
TQApplication::< a href = "ntqapplication.html#postEvent" > postEvent< / a > ( receiver, ce ); // TQt will delete it when done
// To receive an event of this custom event type:
void MyWidget::customEvent( TQCustomEvent * e )
{
if ( e-> < a href = "ntqevent.html#type" > type< / a > () == 65432 ) { // It must be a ColorChangeEvent
ColorChangeEvent* ce = (ColorChangeEvent*)e;
newColor = ce-> color();
}
}
< / pre >
< p > < p > See also < a href = "ntqobject.html#customEvent" > TQWidget::customEvent< / a > (), < a href = "ntqapplication.html#notify" > TQApplication::notify< / a > (), and < a href = "events.html" > Event Classes< / a > .
< hr > < h2 > Member Function Documentation< / h2 >
< h3 class = fn > < a name = "TQCustomEvent" > < / a > TQCustomEvent::TQCustomEvent ( int type )
< / h3 >
Constructs a custom event object with event type < em > type< / em > . The
value of < em > type< / em > must be at least as large as TQEvent::User. The
data pointer is set to 0.
< h3 class = fn > < a name = "TQCustomEvent-2" > < / a > TQCustomEvent::TQCustomEvent ( < a href = "ntqevent.html#Type-enum" > Type< / a > type, void * data )
< / h3 >
< p > Constructs a custom event object with the event type < em > type< / em > and a
pointer to < em > data< / em > . (Note that any int value may safely be cast to
TQEvent::Type).
< h3 class = fn > void * < a name = "data" > < / a > TQCustomEvent::data () const
< / h3 >
< p > Returns a pointer to the generic event data.
< p > < p > See also < a href = "#setData" > setData< / a > ().
< h3 class = fn > void < a name = "setData" > < / a > TQCustomEvent::setData ( void * data )
< / h3 >
< p > Sets the generic data pointer to < em > data< / em > .
< p > < p > See also < a href = "#data" > data< / a > ().
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