Split utilities functions into separate files

src/core/platforminterface.h

@@ -0,0 +1,40 @@
+/*
+ * Strawberry Music Player
+ * Copyright 2010, David Sansome <me@davidsansome.com>
+ * Copyright 2018-2021, 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 PLATFORMINTERFACE_H
+#define PLATFORMINTERFACE_H
+
+#include <QObject>
+#include <QString>
+
+class PlatformInterface {
+ public:
+  PlatformInterface() = default;
+  virtual ~PlatformInterface() {}
+
+  // Called when the application should show itself.
+  virtual void Activate() = 0;
+  virtual bool LoadUrl(const QString &url) = 0;
+
+ private:
+  Q_DISABLE_COPY(PlatformInterface)
+};
+
+#endif  // PLATFORMINTERFACE_H