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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_FRAMEWORK_UNDOMANAGERHELPER_HXX
#define INCLUDED_FRAMEWORK_UNDOMANAGERHELPER_HXX
#include <framework/fwkdllapi.h>
#include <com/sun/star/uno/Sequence.hxx>
#include <com/sun/star/uno/Reference.hxx>
#include <memory>
namespace com::sun::star::document { class XUndoAction; }
namespace com::sun::star::document { class XUndoManager; }
namespace com::sun::star::document { class XUndoManagerListener; }
namespace com::sun::star::util { class XModifyListener; }
namespace framework { class IMutex; }
class SfxUndoManager;
namespace framework
{
//= IMutexGuard
class SAL_NO_VTABLE IMutexGuard
{
public:
/** clears the lock. If the guard does not currently hold the lock, nothing happens.
*/
virtual void clear() = 0;
/** 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;
protected:
~IMutexGuard() {}
};
//= IUndoManagerImplementation
class SAL_NO_VTABLE IUndoManagerImplementation
{
public:
/** returns the SfxUndoManager interface to the actual Undo stack
@throws css::lang::DisposedException
when the instance is already disposed, and no SfxUndoManager can be provided
@throws css::lang::NotInitializedException
when the instance is not initialized, yet, and no SfxUndoManager can be provided
*/
virtual SfxUndoManager& getImplUndoManager() = 0;
/** provides access to a UNO interface for the XUndoManager implementation. Used when throwing exceptions.
*/
virtual css::uno::Reference< css::document::XUndoManager >
getThis() = 0;
protected:
~IUndoManagerImplementation() {}
};
//= 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 mutex 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>SfxUndoManager</code> implementation is made without the mutex being locked.
Note that this implies that the <code>SfxUndoManager</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>SfxUndoManager::Undo</member> and
<member>SfxUndoManager::Redo</member> methods: They're called with the given external mutex being
locked.</li>
</ul>
The reason for the exception for SfxUndoManager::Undo and SfxUndoManager::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 FWK_DLLPUBLIC UndoManagerHelper
{
public:
UndoManagerHelper( IUndoManagerImplementation& i_undoManagerImpl );
~UndoManagerHelper();
// life time control
void disposing();
// XUndoManager equivalents
void enterUndoContext( const OUString& i_title, IMutexGuard& i_instanceLock );
void enterHiddenUndoContext( IMutexGuard& i_instanceLock );
void leaveUndoContext( IMutexGuard& i_instanceLock );
void addUndoAction( const css::uno::Reference< css::document::XUndoAction >& i_action, IMutexGuard& i_instanceLock );
void undo( IMutexGuard& i_instanceLock );
void redo( IMutexGuard& i_instanceLock );
bool isUndoPossible() const;
bool isRedoPossible() const;
OUString getCurrentUndoActionTitle() const;
OUString getCurrentRedoActionTitle() const;
css::uno::Sequence< OUString >
getAllUndoActionTitles() const;
css::uno::Sequence< OUString >
getAllRedoActionTitles() const;
void clear( IMutexGuard& i_instanceLock );
void clearRedo( IMutexGuard& i_instanceLock );
void reset( IMutexGuard& i_instanceLock );
void addUndoManagerListener( const css::uno::Reference< css::document::XUndoManagerListener >& i_listener );
void removeUndoManagerListener( const css::uno::Reference< css::document::XUndoManagerListener >& i_listener );
// XLockable, base of XUndoManager, equivalents
void lock();
void unlock();
bool isLocked();
// XModifyBroadcaster equivalents
void addModifyListener( const css::uno::Reference< css::util::XModifyListener >& i_listener );
void removeModifyListener( const css::uno::Reference< css::util::XModifyListener >& i_listener );
private:
std::unique_ptr< UndoManagerHelper_Impl > m_xImpl;
};
} // namespace framework
#endif // INCLUDED_FRAMEWORK_UNDOMANAGERHELPER_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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