1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/****************************************************************************
**
** Implementation of TQObjectCleanupHandler class
**
** Copyright (C) 2000-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the kernel module of the TQt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free TQt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.TQPL
** included in the packaging of this file. Licensees holding valid TQt
** Commercial licenses may use this file in accordance with the TQt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#include "ntqobjectcleanuphandler.h"
#include "ntqobjectlist.h"
/*!
\class TQObjectCleanupHandler ntqobjectcleanuphandler.h
\brief The TQObjectCleanupHandler class watches the lifetime of multiple TQObjects.
\ingroup objectmodel
A TQObjectCleanupHandler is useful whenever you need to know when a
number of \l{TQObject}s 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.
Example:
\code
class FactoryComponent : public FactoryInterface, public TQLibraryInterface
{
public:
...
TQObject *createObject();
bool init();
void cleanup();
bool canUnload() const;
private:
TQObjectCleanupHandler objects;
};
// allocate a new object, and add it to the cleanup handler
TQObject *FactoryComponent::createObject()
{
return objects.add( new TQObject() );
}
// TQLibraryInterface implementation
bool FactoryComponent::init()
{
return TRUE;
}
void FactoryComponent::cleanup()
{
}
// it is only safe to unload the library when all TQObject's have been destroyed
bool FactoryComponent::canUnload() const
{
return objects.isEmpty();
}
\endcode
*/
/*!
Constructs an empty TQObjectCleanupHandler.
*/
TQObjectCleanupHandler::TQObjectCleanupHandler()
: TQObject(), cleanupObjects( 0 )
{
}
/*!
Destroys the cleanup handler. All objects in this cleanup handler
will be deleted.
*/
TQObjectCleanupHandler::~TQObjectCleanupHandler()
{
clear();
}
/*!
Adds \a object to this cleanup handler and returns the pointer to
the object.
*/
TQObject* TQObjectCleanupHandler::add( TQObject* object )
{
if ( !object )
return 0;
if ( !cleanupObjects ) {
cleanupObjects = new TQObjectList;
cleanupObjects->setAutoDelete( TRUE );
}
connect( object, SIGNAL(destroyed(TQObject*)), this, SLOT(objectDestroyed(TQObject*)) );
cleanupObjects->insert( 0, object );
return object;
}
/*!
Removes the \a object from this cleanup handler. The object will
not be destroyed.
*/
void TQObjectCleanupHandler::remove( TQObject *object )
{
if ( !cleanupObjects )
return;
if ( cleanupObjects->findRef( object ) >= 0 ) {
(void) cleanupObjects->take();
disconnect( object, SIGNAL(destroyed(TQObject*)), this, SLOT(objectDestroyed(TQObject*)) );
}
}
/*!
Returns TRUE if this cleanup handler is empty or if all objects in
this cleanup handler have been destroyed; otherwise return FALSE.
*/
bool TQObjectCleanupHandler::isEmpty() const
{
return cleanupObjects ? cleanupObjects->isEmpty() : TRUE;
}
/*!
Deletes all objects in this cleanup handler. The cleanup handler
becomes empty.
*/
void TQObjectCleanupHandler::clear()
{
delete cleanupObjects;
cleanupObjects = 0;
}
void TQObjectCleanupHandler::objectDestroyed( TQObject*object )
{
if ( cleanupObjects )
cleanupObjects->setAutoDelete( FALSE );
remove( object );
if ( cleanupObjects )
cleanupObjects->setAutoDelete( TRUE );
}
|
