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.
153 lines
3.8 KiB
153 lines
3.8 KiB
'\" t
|
|
.TH QObjectCleanupHandler 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
|
|
QObjectCleanupHandler \- Watches the lifetime of multiple QObjects
|
|
.SH SYNOPSIS
|
|
\fC#include <ntqobjectcleanuphandler.h>\fR
|
|
.PP
|
|
Inherits QObject.
|
|
.PP
|
|
.SS "Public Members"
|
|
.in +1c
|
|
.ti -1c
|
|
.BI "\fBQObjectCleanupHandler\fR ()"
|
|
.br
|
|
.ti -1c
|
|
.BI "\fB~QObjectCleanupHandler\fR ()"
|
|
.br
|
|
.ti -1c
|
|
.BI "QObject * \fBadd\fR ( QObject * object )"
|
|
.br
|
|
.ti -1c
|
|
.BI "void \fBremove\fR ( QObject * object )"
|
|
.br
|
|
.ti -1c
|
|
.BI "bool \fBisEmpty\fR () const"
|
|
.br
|
|
.ti -1c
|
|
.BI "void \fBclear\fR ()"
|
|
.br
|
|
.in -1c
|
|
.SH DESCRIPTION
|
|
The QObjectCleanupHandler class watches the lifetime of multiple QObjects.
|
|
.PP
|
|
A QObjectCleanupHandler is useful whenever you need to know when a number of QObjects that are owned by someone else have been deleted. This is important, for example, when referencing memory in an application that has been allocated in a shared library.
|
|
.PP
|
|
Example:
|
|
.PP
|
|
.nf
|
|
.br
|
|
class FactoryComponent : public FactoryInterface, public QLibraryInterface
|
|
.br
|
|
{
|
|
.br
|
|
public:
|
|
.br
|
|
...
|
|
.br
|
|
.br
|
|
QObject *createObject();
|
|
.br
|
|
.br
|
|
bool init();
|
|
.br
|
|
void cleanup();
|
|
.br
|
|
bool canUnload() const;
|
|
.br
|
|
.br
|
|
private:
|
|
.br
|
|
QObjectCleanupHandler objects;
|
|
.br
|
|
};
|
|
.br
|
|
.br
|
|
// allocate a new object, and add it to the cleanup handler
|
|
.br
|
|
QObject *FactoryComponent::createObject()
|
|
.br
|
|
{
|
|
.br
|
|
return objects.add( new QObject() );
|
|
.br
|
|
}
|
|
.br
|
|
.br
|
|
// QLibraryInterface implementation
|
|
.br
|
|
bool FactoryComponent::init()
|
|
.br
|
|
{
|
|
.br
|
|
return TRUE;
|
|
.br
|
|
}
|
|
.br
|
|
.br
|
|
void FactoryComponent::cleanup()
|
|
.br
|
|
{
|
|
.br
|
|
}
|
|
.br
|
|
.br
|
|
// it is only safe to unload the library when all QObject's have been destroyed
|
|
.br
|
|
bool FactoryComponent::canUnload() const
|
|
.br
|
|
{
|
|
.br
|
|
return objects.isEmpty();
|
|
.br
|
|
}
|
|
.br
|
|
.fi
|
|
.PP
|
|
See also Object Model.
|
|
.SH MEMBER FUNCTION DOCUMENTATION
|
|
.SH "QObjectCleanupHandler::QObjectCleanupHandler ()"
|
|
Constructs an empty QObjectCleanupHandler.
|
|
.SH "QObjectCleanupHandler::~QObjectCleanupHandler ()"
|
|
Destroys the cleanup handler. All objects in this cleanup handler will be deleted.
|
|
.SH "QObject * QObjectCleanupHandler::add ( QObject * object )"
|
|
Adds \fIobject\fR to this cleanup handler and returns the pointer to the object.
|
|
.SH "void QObjectCleanupHandler::clear ()"
|
|
Deletes all objects in this cleanup handler. The cleanup handler becomes empty.
|
|
.SH "bool QObjectCleanupHandler::isEmpty () const"
|
|
Returns TRUE if this cleanup handler is empty or if all objects in this cleanup handler have been destroyed; otherwise return FALSE.
|
|
.SH "void QObjectCleanupHandler::remove ( QObject * object )"
|
|
Removes the \fIobject\fR from this cleanup handler. The object will
|
|
not be destroyed.
|
|
|
|
.SH "SEE ALSO"
|
|
.BR http://doc.trolltech.com/ntqobjectcleanuphandler.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 (tqobjectcleanuphandler.3qt) and the Qt
|
|
version (3.3.8).
|