Add smart playlists, ratings and Qobuz

Fixes #259
Fixes #264

src/smartplaylists/smartplaylistsearchpreview.h

@@ -0,0 +1,74 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2010, 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 SMARTPLAYLISTSEARCHPREVIEW_H
+#define SMARTPLAYLISTSEARCHPREVIEW_H
+
+#include "config.h"
+
+#include <QWidget>
+#include <QFuture>
+#include <QList>
+
+#include "smartplaylistsearch.h"
+#include "playlistgenerator_fwd.h"
+
+class QShowEvent;
+
+class Application;
+class CollectionBackend;
+class Playlist;
+class Ui_SmartPlaylistSearchPreview;
+
+class SmartPlaylistSearchPreview : public QWidget {
+  Q_OBJECT
+
+ public:
+  explicit SmartPlaylistSearchPreview(QWidget *parent = nullptr);
+  ~SmartPlaylistSearchPreview();
+
+  void set_application(Application *app);
+  void set_collection(CollectionBackend *backend);
+
+  void Update(const SmartPlaylistSearch &search);
+
+ protected:
+  void showEvent(QShowEvent*);
+
+ private:
+  void RunSearch(const SmartPlaylistSearch &search);
+
+ private slots:
+  void SearchFinished(QFuture<PlaylistItemList> future);
+
+ private:
+  Ui_SmartPlaylistSearchPreview *ui_;
+  QList<SmartPlaylistSearchTerm::Field> fields_;
+
+  CollectionBackend *backend_;
+  Playlist *model_;
+
+  SmartPlaylistSearch pending_search_;
+  SmartPlaylistSearch last_search_;
+  PlaylistGeneratorPtr generator_;
+
+};
+
+#endif  // SMARTPLAYLISTSEARCHPREVIEW_H