transmission/qt/FaviconCache.h

62 lines
1.3 KiB
C++

/*
* 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 <unordered_map>
#include <unordered_set>
#include <QString>
#include <QObject>
#include <QPixmap>
#include "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::unordered_set<Key>;
// returns a cached pixmap, or a NULL pixmap if there's no match in the cache
QPixmap find(Key const& key);
QPixmap find(QUrl const& url) { return find(getKey(url)); }
static Key getKey(QString const& display_name);
// This will emit a signal when (if) the icon becomes ready.
Key add(QUrl const& url);
static QString getDisplayName(Key const& key);
static QSize getIconSize();
signals:
void pixmapReady(Key const& key);
private slots:
void onRequestFinished(QNetworkReply* reply);
private:
static Key getKey(QUrl const& url);
QString getCacheDir();
void ensureCacheDirHasBeenScanned();
QNetworkAccessManager* nam_ = {};
std::unordered_map<Key, QPixmap> pixmaps_;
};