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
|
/*************************************************************************
* 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.
*
************************************************************************/
#ifndef FRAMEWORK_UNDOMANAGERHELPER_HXX
#define FRAMEWORK_UNDOMANAGERHELPER_HXX
#include "framework/fwedllapi.h"
#include "framework/iguard.hxx"
#include "framework/imutex.hxx"
/** === begin UNO includes === **/
#include <com/sun/star/document/XUndoManager.hpp>
#include <com/sun/star/util/XModifyListener.hpp>
/** === end UNO includes === **/
#include <boost/scoped_ptr.hpp>
namespace svl
{
class IUndoManager;
}
//......................................................................................................................
namespace framework
{
//......................................................................................................................
//==================================================================================================================
//= IMutexGuard
//==================================================================================================================
class SAL_NO_VTABLE IMutexGuard : public IGuard
{
public:
/** returns the mutex guarded by the instance.
Even if the guard currently has not a lock on the mutex, this method must succeed.
*/
virtual IMutex& getGuardedMutex() = 0;
};
//==================================================================================================================
//= IUndoManagerImplementation
//==================================================================================================================
class SAL_NO_VTABLE IUndoManagerImplementation
{
public:
/** returns the IUndoManager interface to the actual Undo stack
@throws com::sun::star::lang::DisposedException
when the instance is already disposed, and no IUndoManager can be provided
@throws com::sun::star::lang::NotInitializedException
when the instance is not initialized, yet, and no IUndoManager can be provided
*/
virtual ::svl::IUndoManager& getImplUndoManager() = 0;
/** provides access to an UNO interface for the XUndoManager implementation. Used when throwing exceptions.
*/
virtual ::com::sun::star::uno::Reference< ::com::sun::star::document::XUndoManager >
getThis() = 0;
};
//==================================================================================================================
//= UndoManagerHelper
//==================================================================================================================
class UndoManagerHelper_Impl;
/** helper class for implementing an XUndoManager
Several of the methods of the class take an IMutexGuard instance. It is assumed that this guard has a lock on
its mutext at the moment the method is entered. The lock will be released before any notifications to the
registered XUndoManagerListeners happen.
The following locking strategy is used for this mutex:
<ul><li>Any notifications to the registered XUndoManagerListeners are after the guard has been cleared. i.e.
without the mutex being locked.</p>
<li>Any calls into the <code>IUndoManager</code> implementation is made without the mutex being locked.
Note that this implies that the <code>IUndoManager</code> implementation must be thread-safe in itself
(which is true for the default implementation, SfxUndoManager).</li>
<li>An exception to the previous item are the <member>IUndoManager::Undo</member> and
<member>IUndoManager::Redo</member> methods: They're called with the given external mutex being
locked.</li>
</ul>
The reason for the exception for IUndoManager::Undo and IUndoManager::Redo is that those are expected to
modify the actual document which the UndoManager works for. And as long as our documents are not thread-safe,
and as long as we do not re-fit <strong>all</strong> existing SfxUndoImplementations to <em>not</em> expect
the dreaded SolarMutex being locked when they're called, the above behavior is a compromise between "how it should
be" and "how it can realistically be".
*/
class FWE_DLLPUBLIC UndoManagerHelper
{
public:
UndoManagerHelper( IUndoManagerImplementation& i_undoManagerImpl );
~UndoManagerHelper();
// life time control
void disposing();
// XUndoManager equivalents
void enterUndoContext( const ::rtl::OUString& i_title, IMutexGuard& i_instanceLock );
void enterHiddenUndoContext( IMutexGuard& i_instanceLock );
void leaveUndoContext( IMutexGuard& i_instanceLock );
void addUndoAction( const ::com::sun::star::uno::Reference< ::com::sun::star::document::XUndoAction >& i_action, IMutexGuard& i_instanceLock );
void undo( IMutexGuard& i_instanceLock );
void redo( IMutexGuard& i_instanceLock );
::sal_Bool isUndoPossible() const;
::sal_Bool isRedoPossible() const;
::rtl::OUString getCurrentUndoActionTitle() const;
::rtl::OUString getCurrentRedoActionTitle() const;
::com::sun::star::uno::Sequence< ::rtl::OUString >
getAllUndoActionTitles() const;
::com::sun::star::uno::Sequence< ::rtl::OUString >
getAllRedoActionTitles() const;
void clear( IMutexGuard& i_instanceLock );
void clearRedo( IMutexGuard& i_instanceLock );
void reset( IMutexGuard& i_instanceLock );
void addUndoManagerListener( const ::com::sun::star::uno::Reference< ::com::sun::star::document::XUndoManagerListener >& i_listener );
void removeUndoManagerListener( const ::com::sun::star::uno::Reference< ::com::sun::star::document::XUndoManagerListener >& i_listener );
// XLockable, base of XUndoManager, equivalents
void lock();
void unlock();
::sal_Bool isLocked();
// XModifyBroadcaster equivalents
void addModifyListener( const ::com::sun::star::uno::Reference< ::com::sun::star::util::XModifyListener >& i_listener );
void removeModifyListener( const ::com::sun::star::uno::Reference< ::com::sun::star::util::XModifyListener >& i_listener );
private:
::boost::scoped_ptr< UndoManagerHelper_Impl > m_pImpl;
};
//......................................................................................................................
} // namespace framework
//......................................................................................................................
#endif // FRAMEWORK_UNDOMANAGERHELPER_HXX
|
