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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#include <toolkit/helper/accessibilityclient.hxx>
#include <toolkit/helper/accessiblefactory.hxx>
#include <osl/module.h>
#include <osl/diagnose.h>
#include <tools/solar.h>
// #define UNLOAD_ON_LAST_CLIENT_DYING
// this is not recommended currently. If enabled, the implementation will log
// the number of active clients, and unload the acc library when the last client
// goes away.
// Sounds like a good idea, unfortunately, there's no guarantee that all objects
// implemented in this library are already dead.
// Iow, just because an object implementing an XAccessible (implemented in this lib
// here) died, it's not said that everybody released all references to the
// XAccessibleContext used by this component, and implemented in the acc lib.
// So we cannot really unload the lib.
//
// Alternatively, if the lib would us own "usage counting", i.e. every component
// implemented therein would affect a static ref count, the acc lib could care
// for unloading itself.
//........................................................................
namespace toolkit
{
//........................................................................
using namespace ::com::sun::star::uno;
using namespace ::com::sun::star::accessibility;
namespace
{
#ifdef UNLOAD_ON_LAST_CLIENT_DYING
static oslInterlockedCount s_nAccessibilityClients = 0;
#endif // UNLOAD_ON_LAST_CLIENT_DYING
static oslModule s_hAccessibleImplementationModule = NULL;
static GetStandardAccComponentFactory s_pAccessibleFactoryFunc = NULL;
static ::rtl::Reference< IAccessibleFactory > s_pFactory;
}
//====================================================================
//= AccessibleDummyFactory
//====================================================================
class AccessibleDummyFactory : public IAccessibleFactory
{
public:
AccessibleDummyFactory();
protected:
virtual ~AccessibleDummyFactory();
private:
AccessibleDummyFactory( const AccessibleDummyFactory& ); // never implemented
AccessibleDummyFactory& operator=( const AccessibleDummyFactory& ); // never implemented
oslInterlockedCount m_refCount;
public:
// IReference
virtual oslInterlockedCount SAL_CALL acquire();
virtual oslInterlockedCount SAL_CALL release();
// IAccessibleFactory
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXButton* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXCheckBox* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXRadioButton* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXListBox* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXFixedHyperlink* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXFixedText* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXScrollBar* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXEdit* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXComboBox* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXToolBox* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXWindow* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessible >
createAccessible( Menu* /*_pMenu*/, sal_Bool /*_bIsMenuBar*/ )
{
return NULL;
}
};
//--------------------------------------------------------------------
AccessibleDummyFactory::AccessibleDummyFactory()
{
}
//--------------------------------------------------------------------
AccessibleDummyFactory::~AccessibleDummyFactory()
{
}
//--------------------------------------------------------------------
oslInterlockedCount SAL_CALL AccessibleDummyFactory::acquire()
{
return osl_atomic_increment( &m_refCount );
}
//--------------------------------------------------------------------
oslInterlockedCount SAL_CALL AccessibleDummyFactory::release()
{
if ( 0 == osl_atomic_decrement( &m_refCount ) )
{
delete this;
return 0;
}
return m_refCount;
}
//====================================================================
//= AccessibilityClient
//====================================================================
//--------------------------------------------------------------------
AccessibilityClient::AccessibilityClient()
:m_bInitialized( false )
{
}
//--------------------------------------------------------------------
extern "C" { static void SAL_CALL thisModule() {} }
void AccessibilityClient::ensureInitialized()
{
if ( m_bInitialized )
return;
::osl::MutexGuard aGuard( ::osl::Mutex::getGlobalMutex() );
#ifdef UNLOAD_ON_LAST_CLIENT_DYING
if ( 1 == osl_atomic_increment( &s_nAccessibilityClients ) )
{ // the first client
#endif // UNLOAD_ON_LAST_CLIENT_DYING
// load the library implementing the factory
if ( !s_pFactory.get() )
{
const ::rtl::OUString sModuleName( SVLIBRARY( "acc" ) );
s_hAccessibleImplementationModule = osl_loadModuleRelative( &thisModule, sModuleName.pData, 0 );
if ( s_hAccessibleImplementationModule != NULL )
{
const ::rtl::OUString sFactoryCreationFunc =
::rtl::OUString("getStandardAccessibleFactory");
s_pAccessibleFactoryFunc = (GetStandardAccComponentFactory)
osl_getFunctionSymbol( s_hAccessibleImplementationModule, sFactoryCreationFunc.pData );
}
OSL_ENSURE( s_pAccessibleFactoryFunc, "AccessibilityClient::ensureInitialized: could not load the library, or not retrieve the needed symbol!" );
// get a factory instance
if ( s_pAccessibleFactoryFunc )
{
IAccessibleFactory* pFactory = static_cast< IAccessibleFactory* >( (*s_pAccessibleFactoryFunc)() );
OSL_ENSURE( pFactory, "AccessibilityClient::ensureInitialized: no factory provided by the A11Y lib!" );
if ( pFactory )
{
s_pFactory = pFactory;
pFactory->release();
}
}
}
if ( !s_pFactory.get() )
// the attempt to load the lib, or to create the factory, failed
// -> fall back to a dummy factory
s_pFactory = new AccessibleDummyFactory;
#ifdef UNLOAD_ON_LAST_CLIENT_DYING
}
#endif
m_bInitialized = true;
}
//--------------------------------------------------------------------
AccessibilityClient::~AccessibilityClient()
{
if ( m_bInitialized )
{
::osl::MutexGuard aGuard( ::osl::Mutex::getGlobalMutex() );
#ifdef UNLOAD_ON_LAST_CLIENT_DYING
if( 0 == osl_atomic_decrement( &s_nAccessibilityClients ) )
{
s_pFactory = NULL;
s_pAccessibleFactoryFunc = NULL;
if ( s_hAccessibleImplementationModule )
{
osl_unloadModule( s_hAccessibleImplementationModule );
s_hAccessibleImplementationModule = NULL;
}
}
#endif // UNLOAD_ON_LAST_CLIENT_DYING
}
}
//--------------------------------------------------------------------
IAccessibleFactory& AccessibilityClient::getFactory()
{
ensureInitialized();
OSL_ENSURE( s_pFactory.is(), "AccessibilityClient::getFactory: at least a dummy factory should have been created!" );
return *s_pFactory;
}
//........................................................................
} // namespace toolkit
//........................................................................
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
