Add smart playlists, ratings and Qobuz

Fixes #259
Fixes #264

src/widgets/ratingwidget.h

@@ -0,0 +1,71 @@
+/*
+ * 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 RATINGWIDGET_H
+#define RATINGWIDGET_H
+
+#include <QWidget>
+#include <QFrame>
+#include <QPixmap>
+#include <QRect>
+
+class RatingPainter {
+ public:
+  RatingPainter();
+
+  static const int kStarCount = 5;
+  static const int kStarSize = 16;
+  static QRect Contents(const QRect &rect);
+  static double RatingForPos(const QPoint &pos, const QRect &rect);
+
+  void Paint(QPainter *painter, const QRect &rect, float rating) const;
+
+ private:
+  QPixmap stars_[kStarCount * 2 + 1];
+};
+
+class RatingWidget : public QWidget {
+  Q_OBJECT
+  Q_PROPERTY(float rating READ rating WRITE set_rating)
+
+ public:
+  RatingWidget(QWidget *parent = nullptr);
+
+  QSize sizeHint() const override;
+
+  float rating() const { return rating_; }
+  void set_rating(const float rating);
+
+ signals:
+  void RatingChanged(float);
+
+ protected:
+  void paintEvent(QPaintEvent*) override;
+  void mousePressEvent(QMouseEvent *e) override;
+  void mouseMoveEvent(QMouseEvent *e) override;
+  void leaveEvent(QEvent*) override;
+
+ private:
+  RatingPainter painter_;
+  float rating_;
+  float hover_rating_;
+};
+
+#endif  // RATINGWIDGET_H