Add "Last Activity" column to transfer list

This column shows the time elapsed since the related torrent has
received or sent a chunk.

Closes #517.

src/qtlibtorrent/torrentmodel.cpp

@@ -292,6 +292,13 @@ QVariant TorrentModelItem::data(int column, int role) const
   }
   case TR_SEEN_COMPLETE_DATE:
     return m_lastStatus.last_seen_complete ? QDateTime::fromTime_t(m_lastStatus.last_seen_complete) : QDateTime();
+  case TR_LAST_ACTIVITY:
+    if (m_torrent.is_paused(m_lastStatus) || m_torrent.is_checking(m_lastStatus))
+      return -1;
+    if (m_lastStatus.time_since_upload < m_lastStatus.time_since_download)
+      return m_lastStatus.time_since_upload;
+    else
+      return m_lastStatus.time_since_download;
   default:
     return QVariant();
   }
@@ -369,6 +376,7 @@ QVariant TorrentModel::headerData(int section, Qt::Orientation orientation,
       case TorrentModelItem::TR_COMPLETED: return tr("Completed", "Amount of data completed (e.g. in MB)");
       case TorrentModelItem::TR_RATIO_LIMIT: return tr("Ratio Limit", "Upload share ratio limit");
       case TorrentModelItem::TR_SEEN_COMPLETE_DATE: return tr("Last Seen Complete", "Torrent was seen complete on 01/01/2010 08:00");
+      case TorrentModelItem::TR_LAST_ACTIVITY: return tr("Last Activity", "Time passed since a chunk was downloaded/uploaded");
       default:
         return QVariant();
       }

src/qtlibtorrent/torrentmodel.h

@@ -49,7 +49,7 @@ Q_OBJECT
 
 public:
   enum State {STATE_DOWNLOADING, STATE_DOWNLOADING_META, STATE_ALLOCATING, STATE_STALLED_DL, STATE_STALLED_UP, STATE_SEEDING, STATE_PAUSED_DL, STATE_PAUSED_UP, STATE_QUEUED_DL, STATE_QUEUED_UP, STATE_CHECKING_UP, STATE_CHECKING_DL, STATE_QUEUED_CHECK, STATE_QUEUED_FASTCHECK, STATE_INVALID};
-  enum Column {TR_NAME, TR_PRIORITY, TR_SIZE, TR_PROGRESS, TR_STATUS, TR_SEEDS, TR_PEERS, TR_DLSPEED, TR_UPSPEED, TR_ETA, TR_RATIO, TR_LABEL, TR_ADD_DATE, TR_SEED_DATE, TR_TRACKER, TR_DLLIMIT, TR_UPLIMIT, TR_AMOUNT_DOWNLOADED, TR_AMOUNT_UPLOADED, TR_AMOUNT_LEFT, TR_TIME_ELAPSED, TR_SAVE_PATH, TR_COMPLETED, TR_RATIO_LIMIT, TR_SEEN_COMPLETE_DATE, NB_COLUMNS};
+  enum Column {TR_NAME, TR_PRIORITY, TR_SIZE, TR_PROGRESS, TR_STATUS, TR_SEEDS, TR_PEERS, TR_DLSPEED, TR_UPSPEED, TR_ETA, TR_RATIO, TR_LABEL, TR_ADD_DATE, TR_SEED_DATE, TR_TRACKER, TR_DLLIMIT, TR_UPLIMIT, TR_AMOUNT_DOWNLOADED, TR_AMOUNT_UPLOADED, TR_AMOUNT_LEFT, TR_TIME_ELAPSED, TR_SAVE_PATH, TR_COMPLETED, TR_RATIO_LIMIT, TR_SEEN_COMPLETE_DATE, TR_LAST_ACTIVITY, NB_COLUMNS};
 
 public:
   TorrentModelItem(const QTorrentHandle& h);

src/transferlistdelegate.cpp

@@ -201,6 +201,18 @@ void TransferListDelegate::paint(QPainter * painter, const QStyleOptionViewItem
 #endif
       break;
     }
+  case TorrentModelItem::TR_LAST_ACTIVITY: {
+      QString elapsedString;
+      long long elapsed = index.data().toLongLong();
+      QItemDelegate::drawBackground(painter, opt, index);
+      opt.displayAlignment = Qt::AlignRight;
+      if (elapsed == 0)
+        // Show '< 1m ago' when elapsed time is 0
+        elapsed = 1;
+      elapsedString = tr("%1 ago", "e.g.: 1h 20m ago").arg(misc::userFriendlyDuration(elapsed));
+      QItemDelegate::drawDisplay(painter, opt, option.rect, elapsedString);
+      break;
+    }
   default:
     QItemDelegate::paint(painter, option, index);
   }

src/transferlistwidget.cpp

@@ -131,6 +131,7 @@ TransferListWidget::TransferListWidget(QWidget *parent, MainWindow *main_window,
     setColumnHidden(TorrentModelItem::TR_COMPLETED, true);
     setColumnHidden(TorrentModelItem::TR_RATIO_LIMIT, true);
     setColumnHidden(TorrentModelItem::TR_SEEN_COMPLETE_DATE, true);
+    setColumnHidden(TorrentModelItem::TR_LAST_ACTIVITY, true);
   }
 
   //Ensure that at least one column is visible at all times