transmission/qt/FaviconCache.h

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// This file Copyright © 2012-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0), GPLv3 (SPDX: GPL-3.0),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#pragma once
#include <unordered_map>
#include <vector>
#include <QObject>
#include <QPixmap>
#include <QString>
#include <libtransmission/tr-macros.h>
#include "Utils.h" // std::hash<QString>
class QNetworkAccessManager;
class QNetworkReply;
class QUrl;
class FaviconCache : public QObject
{
Q_OBJECT
TR_DISABLE_COPY_MOVE(FaviconCache)
public:
FaviconCache();
using Key = QString;
using Keys = std::vector<Key>;
// returns a cached pixmap, or a nullptr pixmap if there's no match in the cache
QPixmap find(Key const& key);
static Key getKey(QString const& display_name);
// This will emit a signal when (if) the icon becomes ready.
Key add(QString const& url);
static QString getDisplayName(Key const& key);
static QSize getIconSize();
signals:
void pixmapReady(Key const& key);
private slots:
void onRequestFinished(QNetworkReply* reply);
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private:
static Key getKey(QUrl const& url);
void ensureCacheDirHasBeenScanned();
QNetworkAccessManager* nam_ = {};
std::unordered_map<Key, QPixmap> pixmaps_;
std::unordered_map<QString, Key> keys_;
};