Add moodbar

src/moodbar/moodbarloader.h

@@ -0,0 +1,79 @@
+/* This file was part of Clementine.
+   Copyright 2012, David Sansome <me@davidsansome.com>
+
+   Strawberry is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Strawberry 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef MOODBARLOADER_H
+#define MOODBARLOADER_H
+
+#include <QObject>
+#include <QThread>
+#include <QList>
+#include <QMap>
+#include <QSet>
+#include <QByteArray>
+#include <QStringList>
+#include <QUrl>
+#include <QNetworkDiskCache>
+
+class Application;
+class MoodbarPipeline;
+
+class MoodbarLoader : public QObject {
+  Q_OBJECT
+
+ public:
+  MoodbarLoader(Application* app, QObject* parent = nullptr);
+  ~MoodbarLoader();
+
+  enum Result {
+    // The URL isn't a local file or the moodbar plugin was not available -
+    // moodbar data can never be loaded.
+    CannotLoad,
+
+    // Moodbar data was loaded and returned.
+    Loaded,
+
+    // Moodbar data will be loaded in the background, a MoodbarPipeline* was
+    // was returned that you can connect to the Finished() signal on.
+    WillLoadAsync
+  };
+
+  Result Load(const QUrl& url, QByteArray* data, MoodbarPipeline** async_pipeline);
+
+ private slots:
+  void ReloadSettings();
+
+  void RequestFinished(MoodbarPipeline* request, const QUrl& filename);
+  void MaybeTakeNextRequest();
+
+ private:
+  static QStringList MoodFilenames(const QString& song_filename);
+
+ private:
+  QNetworkDiskCache* cache_;
+  QThread* thread_;
+
+  const int kMaxActiveRequests;
+
+  QMap<QUrl, MoodbarPipeline*> requests_;
+  QList<QUrl> queued_requests_;
+  QSet<QUrl> active_requests_;
+
+  bool enabled_;
+  bool save_;
+};
+
+#endif  // MOODBARLOADER_H