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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: */