FEATURE: Added option to download first and last piece of a torrent first (for preview)

Changelog

@@ -17,6 +17,7 @@
     - FEATURE: Display trackers status as well as error/warning messages
     - FEATURE: Display the number of peers returned by each tracker & DHT
     - FEATURE: Global upload/download speeds can be capped from status bar (µTorrent behavior)
+    - FEATURE: Added option to download first and last piece of a torrent first (for preview)
     - FEATURE: Dropped Qt 4.3 support (Qt >= 4.4 is now required)
     - FEATURE: Added per-torrent super seeding mode (libtorrent >= v0.15 only)
     - FEATURE: Support for storing symbolic links in .torrent files (libtorrent >= v0.15 only)

src/qtorrenthandle.cpp

@@ -134,6 +134,11 @@ void QTorrentHandle::get_peer_info(std::vector<peer_info>& v) const {
   h.get_peer_info(v);
 }
 
+bool QTorrentHandle::first_last_piece_first() const {
+  Q_ASSERT(h.is_valid());
+  return (h.piece_priority(0) == 7) && (h.piece_priority(h.get_torrent_info().num_pieces()-1) == 7);
+}
+
 size_type QTorrentHandle::total_wanted_done() const {
   Q_ASSERT(h.is_valid());
   return h.status().total_wanted_done;
@@ -532,6 +537,14 @@ void QTorrentHandle::add_tracker(announce_entry const& url) {
   h.add_tracker(url);
 }
 
+void QTorrentHandle::prioritize_first_last_piece(bool b) {
+  Q_ASSERT(h.is_valid());
+  int prio = 1;
+  if(b) prio = 7;
+  h.piece_priority(0, prio);
+  h.piece_priority(h.get_torrent_info().num_pieces()-1, prio);
+}
+
 //
 // Operators
 //

src/qtorrenthandle.h

@@ -122,6 +122,7 @@ class QTorrentHandle {
     void get_peer_info(std::vector<peer_info>&) const;
     bool resolve_countries() const;
     bool priv() const;
+    bool first_last_piece_first() const;
 
     //
     // Setters
@@ -155,6 +156,7 @@ class QTorrentHandle {
     void set_peer_upload_limit(asio::ip::tcp::endpoint ip, int limit) const;
     void set_peer_download_limit(asio::ip::tcp::endpoint ip, int limit) const;
     void add_tracker(announce_entry const& url);
+    void prioritize_first_last_piece(bool b);
 
     //
     // Operators

src/transferlistwidget.cpp

@@ -731,6 +731,18 @@ void TransferListWidget::toggleSelectedTorrentsSequentialDownload() {
   }
 }
 
+void TransferListWidget::toggleSelectedFirstLastPiecePrio() {
+  QModelIndexList selectedIndexes = selectionModel()->selectedRows();
+  foreach(const QModelIndex &index, selectedIndexes) {
+    // Get the file hash
+    QString hash = getHashFromRow(proxyModel->mapToSource(index).row());
+    QTorrentHandle h = BTSession->getTorrentHandle(hash);
+    if(h.is_valid() && h.num_files() == 1) {
+      h.prioritize_first_last_piece(!h.first_last_piece_first());
+    }
+  }
+}
+
 void TransferListWidget::displayListMenu(const QPoint&) {
   // Create actions
   QAction actionStart(QIcon(QString::fromUtf8(":/Icons/skin/play.png")), tr("Start"), 0);
@@ -761,14 +773,16 @@ void TransferListWidget::displayListMenu(const QPoint&) {
   connect(&actionSuper_seeding_mode, SIGNAL(triggered()), this, SLOT(toggleSelectedTorrentsSuperSeeding()));
   QAction actionSequential_download(tr("Download in sequential order"), 0);
   connect(&actionSequential_download, SIGNAL(triggered()), this, SLOT(toggleSelectedTorrentsSequentialDownload()));
+  QAction actionFirstLastPiece_prio(tr("Download first and last piece first"), 0);
+  connect(&actionFirstLastPiece_prio, SIGNAL(triggered()), this, SLOT(toggleSelectedFirstLastPiecePrio()));
   // End of actions
   QMenu listMenu(this);
   // Enable/disable pause/start action given the DL state
   QModelIndexList selectedIndexes = selectionModel()->selectedRows();
   bool has_pause = false, has_start = false, has_preview = false;
-  bool all_same_super_seeding = true, all_same_sequential_download_mode = true;
+  bool all_same_super_seeding = true, all_same_sequential_download_mode = true, all_same_prio_firstlast = true;
-  bool super_seeding_mode = false, sequential_download_mode = false;
+  bool super_seeding_mode = false, sequential_download_mode = false, prioritize_first_last = false;
-  bool one_has_metadata = false, one_not_seed = false;
+  bool one_has_metadata = false, one_not_seed = false, one_has_single_file = false;;
   bool first = true;
   QTorrentHandle h;
   qDebug("Displaying menu");
@@ -784,11 +798,16 @@ void TransferListWidget::displayListMenu(const QPoint&) {
       one_not_seed = true;
       if(first) {
         sequential_download_mode = h.is_sequential_download();
+        prioritize_first_last = h.first_last_piece_first();
       } else {
         if(sequential_download_mode != h.is_sequential_download()) {
           all_same_sequential_download_mode = false;
         }
+        if(prioritize_first_last != h.first_last_piece_first()) {
+          all_same_prio_firstlast = false;
         }
+      }
+      if(h.num_files() == 1) one_has_single_file = true;
     } else {
       if(!one_not_seed && all_same_super_seeding) {
         if(first) {
@@ -812,7 +831,6 @@ void TransferListWidget::displayListMenu(const QPoint&) {
       }
     }
     if(h.has_metadata() && BTSession->isFilePreviewPossible(hash) && !has_preview) {
-      listMenu.addAction(&actionPreview_file);
       has_preview = true;
     }
     first = false;
@@ -834,7 +852,14 @@ void TransferListWidget::displayListMenu(const QPoint&) {
     actionSuper_seeding_mode.setIcon(ico);
     listMenu.addAction(&actionSuper_seeding_mode);
   }
-  if(one_not_seed && all_same_sequential_download_mode) {
+  listMenu.addSeparator();
+  bool added_preview_action = false;
+  if(has_preview) {
+    listMenu.addAction(&actionPreview_file);
+    added_preview_action = true;
+  }
+  if(one_not_seed) {
+    if(all_same_sequential_download_mode) {
       QIcon ico;
       if(sequential_download_mode) {
         ico = QIcon(":/Icons/oxygen/button_ok.png");
@@ -843,7 +868,21 @@ void TransferListWidget::displayListMenu(const QPoint&) {
       }
       actionSequential_download.setIcon(ico);
       listMenu.addAction(&actionSequential_download);
+      added_preview_action = true;
+    }
+    if(all_same_prio_firstlast && one_has_single_file) {
+      QIcon ico;
+      if(prioritize_first_last) {
+        ico = QIcon(":/Icons/oxygen/button_ok.png");
+      } else {
+        ico = QIcon(":/Icons/oxygen/button_cancel.png");
+      }
+      actionFirstLastPiece_prio.setIcon(ico);
+      listMenu.addAction(&actionFirstLastPiece_prio);
+      added_preview_action = true;
+    }
   }
+    if(added_preview_action)
   listMenu.addSeparator();
   if(one_has_metadata) {
     listMenu.addAction(&actionForce_recheck);

src/transferlistwidget.h

@@ -81,6 +81,7 @@ protected slots:
   void toggleSelectedTorrentsSuperSeeding();
 #endif
   void toggleSelectedTorrentsSequentialDownload();
+  void toggleSelectedFirstLastPiecePrio();
   //void setRowColor(int row, QColor color);
 
 public slots: