Add Last.fm import

Fixes #247

src/dialogs/lastfmimportdialog.h

@@ -0,0 +1,68 @@
+/*
+ * Strawberry Music Player
+ * Copyright 2020, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * 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 LASTFMIMPORTDIALOG_H
+#define LASTFMIMPORTDIALOG_H
+
+#include "config.h"
+
+#include <QObject>
+#include <QDialog>
+#include <QString>
+
+#include "ui_lastfmimportdialog.h"
+
+class QShowEvent;
+class QCloseEvent;
+class LastFMImport;
+
+class LastFMImportDialog : public QDialog {
+  Q_OBJECT
+
+ public:
+  explicit LastFMImportDialog(LastFMImport *lastfm_import, QWidget *parent = nullptr);
+  ~LastFMImportDialog() override;
+
+ protected:
+  void showEvent(QShowEvent*);
+  void closeEvent(QCloseEvent*);
+
+ private:
+  void Reset();
+
+ private slots:
+  void Start();
+  void Cancel();
+  void UpdateGoButtonState();
+
+  void UpdateTotal(const int lastplayed_total, const int playcount_total);
+  void UpdateProgress(const int lastplayed_received, const int playcount_received);
+  void Finished();
+  void FinishedWithError(const QString &error);
+
+ private:
+  Ui_LastFMImportDialog *ui_;
+  LastFMImport *lastfm_import_;
+
+  bool finished_;
+  int playcount_total_;
+  int lastplayed_total_;
+};
+
+#endif  // LASTFMIMPORTDIALOG_H