transmission/qt/FaviconCache.h

/*
 * This file Copyright (C) 2012-2015 Mnemosyne LLC
 *
 * It may be used under the GNU GPL versions 2 or 3
 * or any future license endorsed by Mnemosyne LLC.
 *
 */

#pragma once

#include <QMap>
#include <QString>
#include <QObject>
#include <QPixmap>

class QNetworkAccessManager;
class QNetworkReply;
class QUrl;

class FaviconCache: public QObject
{
    Q_OBJECT

  public:
    FaviconCache ();
    virtual ~FaviconCache ();

    // returns a cached pixmap, or a NULL pixmap if there's no match in the cache
    QPixmap find (const QUrl& url);

    // returns a cached pixmap, or a NULL pixmap if there's no match in the cache
    QPixmap findFromHost (const QString& host);

    // this will emit a signal when (if) the icon becomes ready
    void add (const QUrl& url);

    static QString getHost (const QUrl& url);
    static QSize getIconSize ();

  signals:
    void pixmapReady (const QString& host);

  private:
    QString getCacheDir ();
    void ensureCacheDirHasBeenScanned ();

  private slots:
    void onRequestFinished (QNetworkReply * reply);

  private:
    QNetworkAccessManager * myNAM;
    QMap<QString, QPixmap> myPixmaps;
};