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| -rw-r--r-- | include/framework/undomanagerhelper.hxx | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/include/framework/undomanagerhelper.hxx b/include/framework/undomanagerhelper.hxx new file mode 100644 index 000000000..eb9986919 --- /dev/null +++ b/include/framework/undomanagerhelper.hxx @@ -0,0 +1,162 @@ +/* -*- 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: */ |