You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
131 lines
4.3 KiB
131 lines
4.3 KiB
'\" t
|
|
.TH TQCustomEvent 3qt "2 February 2007" "Trolltech AS" \" -*- nroff -*-
|
|
.\" Copyright 1992-2007 Trolltech ASA. All rights reserved. See the
|
|
.\" license file included in the distribution for a complete license
|
|
.\" statement.
|
|
.\"
|
|
.ad l
|
|
.nh
|
|
.SH NAME
|
|
TQCustomEvent \- Support for custom events
|
|
.SH SYNOPSIS
|
|
\fC#include <tqevent.h>\fR
|
|
.PP
|
|
Inherits TQEvent.
|
|
.PP
|
|
.SS "Public Members"
|
|
.in +1c
|
|
.ti -1c
|
|
.BI "\fBTQCustomEvent\fR ( int type )"
|
|
.br
|
|
.ti -1c
|
|
.BI "\fBTQCustomEvent\fR ( Type type, void * data )"
|
|
.br
|
|
.ti -1c
|
|
.BI "void * \fBdata\fR () const"
|
|
.br
|
|
.ti -1c
|
|
.BI "void \fBsetData\fR ( void * data )"
|
|
.br
|
|
.in -1c
|
|
.SH DESCRIPTION
|
|
The TQCustomEvent class provides support for custom events.
|
|
.PP
|
|
TQCustomEvent is a generic event class for user-defined events. User defined events can be sent to widgets or other TQObject instances using QApplication::postEvent() or QApplication::sendEvent(). Subclasses of TQObject can easily receive custom events by implementing the TQObject::customEvent() event handler function.
|
|
.PP
|
|
TQCustomEvent objects should be created with a type ID that uniquely identifies the event type. To avoid clashes with the Qt-defined events types, the value should be at least as large as the value of the "User" entry in the TQEvent::Type enum.
|
|
.PP
|
|
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.
|
|
.PP
|
|
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.
|
|
.PP
|
|
Example:
|
|
.PP
|
|
.nf
|
|
.br
|
|
class ColorChangeEvent : public TQCustomEvent
|
|
.br
|
|
{
|
|
.br
|
|
public:
|
|
.br
|
|
ColorChangeEvent( TQColor color )
|
|
.br
|
|
: TQCustomEvent( 65432 ), c( color ) {}
|
|
.br
|
|
TQColor color() const { return c; }
|
|
.br
|
|
private:
|
|
.br
|
|
TQColor c;
|
|
.br
|
|
};
|
|
.br
|
|
.br
|
|
// To send an event of this custom event type:
|
|
.br
|
|
.br
|
|
ColorChangeEvent* ce = new ColorChangeEvent( blue );
|
|
.br
|
|
QApplication::postEvent( receiver, ce ); // TQt will delete it when done
|
|
.br
|
|
.br
|
|
// To receive an event of this custom event type:
|
|
.br
|
|
.br
|
|
void MyWidget::customEvent( TQCustomEvent * e )
|
|
.br
|
|
{
|
|
.br
|
|
if ( e->type() == 65432 ) { // It must be a ColorChangeEvent
|
|
.br
|
|
ColorChangeEvent* ce = (ColorChangeEvent*)e;
|
|
.br
|
|
newColor = ce->color();
|
|
.br
|
|
}
|
|
.br
|
|
}
|
|
.br
|
|
.fi
|
|
.PP
|
|
See also TQWidget::customEvent(), QApplication::notify(), and Event Classes.
|
|
.SH MEMBER FUNCTION DOCUMENTATION
|
|
.SH "TQCustomEvent::TQCustomEvent ( int type )"
|
|
Constructs a custom event object with event type \fItype\fR. The value of \fItype\fR must be at least as large as TQEvent::User. The data pointer is set to 0.
|
|
.SH "TQCustomEvent::TQCustomEvent ( Type type, void * data )"
|
|
Constructs a custom event object with the event type \fItype\fR and a pointer to \fIdata\fR. (Note that any int value may safely be cast to TQEvent::Type).
|
|
.SH "void * TQCustomEvent::data () const"
|
|
Returns a pointer to the generic event data.
|
|
.PP
|
|
See also setData().
|
|
.SH "void TQCustomEvent::setData ( void * data )"
|
|
Sets the generic data pointer to \fIdata\fR.
|
|
.PP
|
|
See also data().
|
|
|
|
.SH "SEE ALSO"
|
|
.BR http://doc.trolltech.com/tqcustomevent.html
|
|
.BR http://www.trolltech.com/faq/tech.html
|
|
.SH COPYRIGHT
|
|
Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
|
|
license file included in the distribution for a complete license
|
|
statement.
|
|
.SH AUTHOR
|
|
Generated automatically from the source code.
|
|
.SH BUGS
|
|
If you find a bug in Qt, please report it as described in
|
|
.BR http://doc.trolltech.com/bughowto.html .
|
|
Good bug reports help us to help you. Thank you.
|
|
.P
|
|
The definitive TQt documentation is provided in HTML format; it is
|
|
located at $TQTDIR/doc/html and can be read using TQt Assistant or with
|
|
a web browser. This man page is provided as a convenience for those
|
|
users who prefer man pages, although this format is not officially
|
|
supported by Trolltech.
|
|
.P
|
|
If you find errors in this manual page, please report them to
|
|
.BR qt-bugs@trolltech.com .
|
|
Please include the name of the manual page (tqcustomevent.3qt) and the Qt
|
|
version (3.3.8).
|