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git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@7598 a592a061-630c-0410-9148-cb99ea01b6c8
88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
// -*- C++ -*-
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/**
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* \file GraphicsCache.h
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Baruch Even
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* \author Angus Leeming
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*
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* Full author contact details are available in file CREDITS.
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*
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* lyx::graphics::Cache is the manager of the image cache.
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* It is responsible for creating the lyx::graphics::CacheItem's
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* and maintaining them.
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*
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* lyx::graphics::Cache is a singleton class. It is possible to have only one
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* instance of it at any moment.
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*/
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#ifndef GRAPHICSCACHE_H
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#define GRAPHICSCACHE_H
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#include "LString.h"
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#include <vector>
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#include <boost/utility.hpp>
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#include <boost/scoped_ptr.hpp>
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#include <boost/shared_ptr.hpp>
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namespace lyx {
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namespace graphics {
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class CacheItem;
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class Cache : boost::noncopyable {
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public:
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/// This is a singleton class. Get the instance.
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static Cache & get();
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/** Which graphics formats can be loaded directly by the image loader.
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* Other formats can be loaded if a converter to a loadable format
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* can be defined.
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*/
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std::vector<string> loadableFormats() const;
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/// Add a graphics file to the cache.
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void add(string const & file) const;
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/// Remove a file from the cache.
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void remove(string const & file) const;
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/// Returns \c true if the file is in the cache.
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bool inCache(string const & file) const;
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/** Get the cache item associated with file.
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* Returns an empty container if there is no such item.
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*
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* IMPORTANT: whatever uses an image must make a local copy of this
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* ItemPtr. The boost::shared_ptr<>::use_count() function is
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* used to ascertain whether or not to remove the item from the cache
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* when remove(file) is called.
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*
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* You have been warned!
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*/
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typedef boost::shared_ptr<CacheItem> ItemPtr;
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///
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ItemPtr const item(string const & file) const;
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private:
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/** Make the c-tor, d-tor private so we can control how many objects
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* are instantiated.
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*/
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Cache();
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///
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~Cache();
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/// Use the Pimpl idiom to hide the internals.
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class Impl;
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/// The pointer never changes although *pimpl_'s contents may.
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boost::scoped_ptr<Impl> const pimpl_;
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};
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} // namespace graphics
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} // namespace lyx
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#endif // GRAPHICSCACHE_H
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