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+#ifndef SAMPLE_DOWNLOADER_HPP__
+#define SAMPLE_DOWNLOADER_HPP__
+
+#include <QObject>
+
+#include "pimpl_h.hpp"
+
+class QSettings;
+class QWidget;
+class QNetworkAccessManager;
+class Configuration;
+
+//
+// SampleDownloader - A Dialog to maintain sample files
+//
+// This  uses a  Qt Dialog  window that  contains a  tree view  of the
+// available sample  files on a  web or ftp  server. The files  can be
+// installed locally by ticking a check  box or removed from the local
+// machine by un-ticking the check boxes.
+//
+// The class requires a pointer to an open QSettings instance where it
+// will save its persistent state, a pointer to a WSJT-X Configuration
+// instance that is used to  obtain configuration information like the
+// current    file   save    location    and,   a    pointer   to    a
+// QNetworkAccessManager instance which is used for network requests.
+//
+// An instance  of SampleDownloader need  not be destroyed  after use,
+// just  call  SampleDownloader::show()  to make  the  dialog  visible
+// again.
+//
+class SampleDownloader final
+  : public QObject
+{
+  Q_OBJECT;
+
+public:
+  SampleDownloader (QSettings * settings
+                    , Configuration const *
+                    , QNetworkAccessManager *
+                    , QWidget * parent = nullptr);
+  ~SampleDownloader ();
+
+  Q_SLOT void show ();
+
+private:
+  class impl;
+  pimpl<impl> m_;
+};
+
+#endif