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/* This file is part of the KDE project
Copyright (C) 2009 Thorsten Zachmann <zachmann@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef KOPAPIXMAPCACHE_H
#define KOPAPIXMAPCACHE_H
#include <QMap>
#include <QSize>
class QString;
class QPixmap;
/**
* This class is a cache for pixmaps which will be cached for different sizes
* of the same pixmap If a key is removed from the cache all cached sizes will
* be removed from the cache.
*
* The API is similar to QPixmpaCache. The only addition is that you need to
* specify the size of the pixmap when you search it.
*
* The implementation uses QPixmapCache.
*
* This class is a singleton.
*/
class KoPAPixmapCache
{
public:
class Singleton;
/**
* Get the pixmap cache singleton
*/
static KoPAPixmapCache * instance();
~KoPAPixmapCache();
/**
* Returns the cache limit (in kilobytes)
*/
int cacheLimit();
/**
* Removes all pixmaps from the cache.
*
* @param all If true QPixmpaCache::clear will be called.
* If false only the pixmaps which were added via this object
* will be removed
*/
void clear( bool all = true );
/**
* Looks for a cached pixmap associated with the key in the cache.
*
* If the pixmap is found, the function sets pm to that pixmap and returns true;
* otherwise it leaves pm alone and returns false.
*
* @param key the key of the pixmap
* @param size the size you want to have the pixmap
* @param pm the pixmap
*/
bool find( const QString & key, const QSize & size, QPixmap & pm );
/**
* Insert a copy of the pixmap into the cache.
*
* The size is taken from the pixmap.
*/
bool insert( const QString & key, const QPixmap & pm, const QSize &size = QSize());
/**
* Remove all pixmaps associated with key from the cache
*/
void remove( const QString & key );
/**
* Sets the cache limit to n kilobytes
*/
void setCacheLimit( int n );
private:
KoPAPixmapCache();
KoPAPixmapCache( const KoPAPixmapCache & );
KoPAPixmapCache operator=( const KoPAPixmapCache & );
QString generateKey( const QString &key, const QSize & size );
QMap<QString, QList<QSize> > m_keySize;
};
#endif /* KOPAPIXMAPCACHE_H */
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