mirror of
https://git.lyx.org/repos/lyx.git
synced 2024-11-11 05:33:33 +00:00
c62517df1c
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@4688 a592a061-630c-0410-9148-cb99ea01b6c8
87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
// -*- C++ -*-
|
|
/**
|
|
* \file GraphicsCache.h
|
|
* Copyright 2002 the LyX Team
|
|
* Read the file COPYING
|
|
*
|
|
* \author Baruch Even <baruch.even@writeme.com>
|
|
* \author Angus Leeming <leeming@lyx.org>
|
|
*
|
|
* grfx::Cache is the manager of the image cache.
|
|
* It is responsible for creating the grfx::CacheItem's and maintaining them.
|
|
*
|
|
* grfx::Cache is a singleton class. It is possible to have only one
|
|
* instance of it at any moment.
|
|
*/
|
|
|
|
#ifndef GRAPHICSCACHE_H
|
|
#define GRAPHICSCACHE_H
|
|
|
|
#ifdef __GNUG__
|
|
#pragma interface
|
|
#endif
|
|
|
|
#include "LString.h"
|
|
#include <vector>
|
|
#include <boost/utility.hpp>
|
|
#include <boost/scoped_ptr.hpp>
|
|
#include <boost/shared_ptr.hpp>
|
|
|
|
|
|
namespace grfx {
|
|
|
|
class CacheItem;
|
|
|
|
class Cache : boost::noncopyable {
|
|
public:
|
|
|
|
/// This is a singleton class. Get the instance.
|
|
static Cache & get();
|
|
|
|
/** Which graphics formats can be loaded directly by the image loader.
|
|
* Other formats can be loaded if a converter to a loadable format
|
|
* can be defined.
|
|
*/
|
|
std::vector<string> loadableFormats() const;
|
|
|
|
/// Add a graphics file to the cache.
|
|
void add(string const & file) const;
|
|
|
|
/// Remove a file from the cache.
|
|
void remove(string const & file) const;
|
|
|
|
/// Returns \c true if the file is in the cache.
|
|
bool inCache(string const & file) const;
|
|
|
|
/** Get the cache item associated with file.
|
|
* Returns an empty container if there is no such item.
|
|
*
|
|
* IMPORTANT: whatever uses an image must make a local copy of this
|
|
* ItemPtr. The boost::shared_ptr<>::use_count() function is
|
|
* used to ascertain whether or not to remove the item from the cache
|
|
* when remove(file) is called.
|
|
*
|
|
* You have been warned!
|
|
*/
|
|
typedef boost::shared_ptr<CacheItem> ItemPtr;
|
|
///
|
|
ItemPtr const item(string const & file) const;
|
|
|
|
private:
|
|
/** Make the c-tor, d-tor private so we can control how many objects
|
|
* are instantiated.
|
|
*/
|
|
Cache();
|
|
///
|
|
~Cache();
|
|
|
|
/// Use the Pimpl idiom to hide the internals.
|
|
class Impl;
|
|
/// The pointer never changes although *pimpl_'s contents may.
|
|
boost::scoped_ptr<Impl> const pimpl_;
|
|
};
|
|
|
|
} // namespace grfx
|
|
|
|
#endif // GRAPHICSCACHE_H
|