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.svn/pristine/21/21fb4c40899c731bbcae7ba5df2f920908bc737a.svn-base

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+#ifndef FILE_NODE_HPP__
+#define FILE_NODE_HPP__
+
+#include <QTreeWidgetItem>
+
+#include "RemoteFile.hpp"
+
+class QNetworkAccessManager;
+class QString;
+class QUrl;
+
+//
+// A holder for a RemoteFile object linked to a QTreeWidget row.
+//
+// It  renders  the file  name  in  first  column and  holds  download
+// progress data in  the second column. The progress  information is a
+// 64 bit integer number of bytes in the DisplayRole and a total bytes
+// expected in the UserRole. The first column also renders a check box
+// that downloads  the file  when checked  and removes  the downloaded
+// file  when unchecked.  The URL  and  local absolute  file path  are
+// stored in the UserData and UserData+1 roles of the first column.
+//
+class FileNode final
+  : public QTreeWidgetItem
+  , protected RemoteFile::ListenerInterface
+{
+public:
+  explicit FileNode (QTreeWidgetItem * parent
+                     , QNetworkAccessManager * network_manager
+                     , QString const& local_path
+                     , QUrl const& url
+                     , bool http_only);
+
+  bool local () const {return remote_file_.local ();}
+  bool sync (bool local);
+  void abort ();
+
+  static int constexpr Type {UserType + 1};
+
+  //
+  // Clients may  use this RAII  class to  block nested calls  to sync
+  // which may be troublesome, e.g. when UI updates cause recursion.
+  //
+  struct sync_blocker
+  {
+    sync_blocker (FileNode * node) : node_ {node} {node_->block_sync_ = true;}
+    sync_blocker (sync_blocker const&) = delete;
+    sync_blocker& operator = (sync_blocker const&) = delete;
+    ~sync_blocker () {node_->block_sync_ = false;}
+  private:
+    FileNode * node_;
+  };
+
+protected:
+  void error (QString const& title, QString const& message) override;
+  bool redirect_request (QUrl const&) override {return true;} // allow
+  void download_progress (qint64 bytes_received, qint64 total_bytes) override;
+  void download_finished (bool success) override;
+
+private:
+  RemoteFile remote_file_;      // active download
+  bool block_sync_;
+
+  friend struct sync_blocker;
+};
+
+#endif