resourceloader.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/
 
#pragma once
 
#include <memory>
#include <QObject>
#include <QStringList>
#include <QDir>
#include <QCache>
#include <QPixmap>
#include "sysconfig.h"
 
class QAbstractItemModel;
class QStandardItemModel;
class QSortFilterProxyModel;
class QFileSystemWatcher;
class QTimer;
 
namespace LC::Util
{
    using QIODevice_ptr = std::shared_ptr<QIODevice>;
 
    class UTIL_SYS_API ResourceLoader : public QObject
    {
        Q_OBJECT
 
        QStringList LocalPrefixesChain_;
        QStringList GlobalPrefixesChain_;
        QString RelativePath_;
 
        QHash<QString, QStringList> Entry2Paths_;
 
        QStandardItemModel *SubElemModel_;
        QStringList NameFilters_;
        QDir::Filters AttrFilters_ = QDir::Dirs | QDir::NoDotAndDotDot | QDir::Readable;
        QSortFilterProxyModel *SortModel_;
 
        QFileSystemWatcher *Watcher_;
 
        QTimer *CacheFlushTimer_;
        mutable QCache<QString, QByteArray> CachePathContents_ { 0 };
        mutable QCache<QString, QPixmap> CachePixmaps_ { 0 };
 
        bool Verbose_ = false;
    public:
        explicit ResourceLoader (const QString& relPath, QObject* obj = nullptr);
 
        void AddGlobalPrefix ();
 
        void AddLocalPrefix (QString prefix = QString ());
 
        void SetCacheParams (int size, int timeout);
 
        void FlushCache ();
 
        QFileInfoList List (const QString& option,
                const QStringList& names = {},
                QDir::Filters filters = QDir::NoFilter) const;
 
        QString GetPath (const QStringList& pathVariants) const;
 
        QString GetIconPath (const QString& basename) const;
 
        QIODevice_ptr Load (const QStringList& pathVariants, bool open = false) const;
 
        QIODevice_ptr Load (const QString& pathVariant, bool open = false) const;
 
        QIODevice_ptr GetIconDevice (const QString& basename, bool open = false) const;
 
        QPixmap LoadPixmap (const QString& basename) const;
 
        QAbstractItemModel* GetSubElemModel () const;
 
        void SetAttrFilters (QDir::Filters);
 
        void SetNameFilters (const QStringList&);
 
        void SetVerbose (bool verbose);
    private:
        void ScanPath (const QString&);
        void HandleDirectoryChanged (const QString&);
    signals:
        void watchedDirectoriesChanged ();
    };
}