diff --git a/src/base/bittorrent/torrenthandle.cpp b/src/base/bittorrent/torrenthandle.cpp
index a6436ec34..f9ad2c697 100644
--- a/src/base/bittorrent/torrenthandle.cpp
+++ b/src/base/bittorrent/torrenthandle.cpp
@@ -1953,3 +1953,24 @@ void TorrentHandle::prioritizeFiles(const QVector<int> &priorities)
 
     updateStatus();
 }
+
+QVector<qreal> TorrentHandle::availableFileFractions() const
+{
+    QVector<int> piecesAvailability = pieceAvailability();
+    const auto filesCount = this->filesCount();
+    // libtorrent returns empty array for seeding only torrents
+    if (piecesAvailability.empty()) return QVector<qreal>(filesCount, -1.);
+
+    QVector<qreal> res;
+    res.reserve(filesCount);
+    TorrentInfo info = this->info();
+    for (int file = 0; file < filesCount; ++file) {
+        TorrentInfo::PieceRange filePieces = info.filePieces(file);
+        int availablePieces = 0;
+        for (int piece = filePieces.first(); piece <= filePieces.last(); ++piece) {
+            availablePieces += piecesAvailability[piece] > 0 ? 1 : 0;
+        }
+        res.push_back(static_cast<qreal>(availablePieces) / filePieces.size());
+    }
+    return res;
+}
diff --git a/src/base/bittorrent/torrenthandle.h b/src/base/bittorrent/torrenthandle.h
index 8cdcfe02e..cb0c183cc 100644
--- a/src/base/bittorrent/torrenthandle.h
+++ b/src/base/bittorrent/torrenthandle.h
@@ -361,6 +361,14 @@ namespace BitTorrent
         void handleAppendExtensionToggled();
         void saveResumeData(bool updateStatus = false);
 
+        /**
+         * @brief fraction of file pieces that are available at least from one peer
+         *
+         * This is not the same as torrrent availability, it is just a fraction of pieces
+         * that can be downloaded right now. It varies between 0 to 1.
+         */
+        QVector<qreal> availableFileFractions() const;
+
     private:
         typedef boost::function<void ()> EventTrigger;
 
diff --git a/src/base/unicodestrings.h b/src/base/unicodestrings.h
index 33e164ddb..88ffe7782 100644
--- a/src/base/unicodestrings.h
+++ b/src/base/unicodestrings.h
@@ -39,6 +39,7 @@ const char C_NON_BREAKING_SPACE[] = " ";
 const char C_UP[] = "▲";
 const char C_DOWN[] = "▼";
 const char C_COPYRIGHT[] = "©";
+const char C_THIN_SPACE[] = " ";
 const char C_UTP[] = "μTP";
 const char C_LOCALE_ENGLISH[] = "English";
 const char C_LOCALE_ENGLISH_AUSTRALIA[] = "English(Australia)";
diff --git a/src/gui/addnewtorrentdialog.cpp b/src/gui/addnewtorrentdialog.cpp
index 5bbac7bb4..bbdb6901c 100644
--- a/src/gui/addnewtorrentdialog.cpp
+++ b/src/gui/addnewtorrentdialog.cpp
@@ -737,6 +737,7 @@ void AddNewTorrentDialog::setupTreeview()
         // Hide useless columns after loading the header state
         ui->contentTreeView->hideColumn(PROGRESS);
         ui->contentTreeView->hideColumn(REMAINING);
+        ui->contentTreeView->hideColumn(AVAILABILITY);
 
         // Expand root folder
         ui->contentTreeView->setExpanded(m_contentModel->index(0, 0), true);
diff --git a/src/gui/properties/propertieswidget.cpp b/src/gui/properties/propertieswidget.cpp
index 77466c748..5df08d842 100644
--- a/src/gui/properties/propertieswidget.cpp
+++ b/src/gui/properties/propertieswidget.cpp
@@ -493,6 +493,7 @@ void PropertiesWidget::loadDynamicData()
             qDebug("Updating priorities in files tab");
             m_ui->filesList->setUpdatesEnabled(false);
             PropListModel->model()->updateFilesProgress(m_torrent->filesProgress());
+            PropListModel->model()->updateFilesAvailability(m_torrent->availableFileFractions());
             // XXX: We don't update file priorities regularly for performance
             // reasons. This means that priorities will not be updated if
             // set from the Web UI.
diff --git a/src/gui/properties/proplistdelegate.cpp b/src/gui/properties/proplistdelegate.cpp
index 2c845ba6f..b1b1b3645 100644
--- a/src/gui/properties/proplistdelegate.cpp
+++ b/src/gui/properties/proplistdelegate.cpp
@@ -42,6 +42,7 @@
 #include <QProxyStyle>
 #endif
 
+#include "base/unicodestrings.h"
 #include "base/utils/misc.h"
 #include "base/utils/string.h"
 #include "propertieswidget.h"
@@ -131,6 +132,19 @@ void PropListDelegate::paint(QPainter *painter, const QStyleOptionViewItem &opti
         QItemDelegate::drawDisplay(painter, opt, option.rect, text);
         }
         break;
+    case AVAILABILITY: {
+            const qreal availability = index.data().toDouble();
+            if (availability < 0) {
+                QItemDelegate::drawDisplay(painter, opt, option.rect, tr("N/A"));
+            }
+            else {
+                const QString value = (availability >= 1.0)
+                                        ? QLatin1String("100")
+                                        : Utils::String::fromDouble(availability * 100., 1);
+                QItemDelegate::drawDisplay(painter, opt, option.rect, value + C_THIN_SPACE + QLatin1Char('%'));
+            }
+        }
+        break;
     default:
         QItemDelegate::paint(painter, option, index);
         break;
diff --git a/src/gui/properties/proplistdelegate.h b/src/gui/properties/proplistdelegate.h
index 2d5e41335..ed9035349 100644
--- a/src/gui/properties/proplistdelegate.h
+++ b/src/gui/properties/proplistdelegate.h
@@ -46,7 +46,8 @@ enum PropColumn
     PCSIZE,
     PROGRESS,
     PRIORITY,
-    REMAINING
+    REMAINING,
+    AVAILABILITY
 };
 
 class PropListDelegate: public QItemDelegate
@@ -72,3 +73,4 @@ private:
 };
 
 #endif
+
diff --git a/src/gui/torrentcontentmodel.cpp b/src/gui/torrentcontentmodel.cpp
index 528e7a7d1..ace9868a8 100644
--- a/src/gui/torrentcontentmodel.cpp
+++ b/src/gui/torrentcontentmodel.cpp
@@ -56,7 +56,7 @@ namespace
 
 TorrentContentModel::TorrentContentModel(QObject *parent)
     : QAbstractItemModel(parent)
-    , m_rootItem(new TorrentContentModelFolder(QList<QVariant>({ tr("Name"), tr("Size"), tr("Progress"), tr("Download Priority"), tr("Remaining") })))
+    , m_rootItem(new TorrentContentModelFolder(QList<QVariant>({ tr("Name"), tr("Size"), tr("Progress"), tr("Download Priority"), tr("Remaining"), tr("Availability") })))
 {
 }
 
@@ -76,6 +76,7 @@ void TorrentContentModel::updateFilesProgress(const QVector<qreal> &fp)
         m_filesIndex[i]->setProgress(fp[i]);
     // Update folders progress in the tree
     m_rootItem->recalculateProgress();
+    m_rootItem->recalculateAvailability();
     emit dataChanged(index(0, 0), index(rowCount(), columnCount()));
 }
 
@@ -92,6 +93,20 @@ void TorrentContentModel::updateFilesPriorities(const QVector<int> &fprio)
     emit dataChanged(index(0, 0), index(rowCount(), columnCount()));
 }
 
+void TorrentContentModel::updateFilesAvailability(const QVector<qreal> &fa)
+{
+    Q_ASSERT(m_filesIndex.size() == fa.size());
+    // XXX: Why is this necessary?
+    if (m_filesIndex.size() != fa.size()) return;
+
+    emit layoutAboutToBeChanged();
+    for (int i = 0; i < fa.size(); ++i)
+        m_filesIndex[i]->setAvailability(fa[i]);
+    // Update folders progress in the tree
+    m_rootItem->recalculateProgress();
+    emit dataChanged(index(0, 0), index(rowCount(), columnCount()));
+}
+
 QVector<int> TorrentContentModel::getFilePriorities() const
 {
     QVector<int> prio;
@@ -134,6 +149,7 @@ bool TorrentContentModel::setData(const QModelIndex& index, const QVariant& valu
                 item->setPriority(prio::NORMAL);
             // Update folders progress in the tree
             m_rootItem->recalculateProgress();
+            m_rootItem->recalculateAvailability();
             emit dataChanged(this->index(0, 0), this->index(rowCount() - 1, columnCount() - 1));
             emit filteredFilesChanged();
         }
diff --git a/src/gui/torrentcontentmodel.h b/src/gui/torrentcontentmodel.h
index 547c85cfb..8fa9ac565 100644
--- a/src/gui/torrentcontentmodel.h
+++ b/src/gui/torrentcontentmodel.h
@@ -41,40 +41,42 @@
 
 class TorrentContentModelFile;
 
-class TorrentContentModel:  public QAbstractItemModel {
-  Q_OBJECT
+class TorrentContentModel: public QAbstractItemModel
+{
+    Q_OBJECT
 
 public:
-  TorrentContentModel(QObject *parent = 0);
-  ~TorrentContentModel();
+    TorrentContentModel(QObject *parent = 0);
+    ~TorrentContentModel();
 
-  void updateFilesProgress(const QVector<qreal> &fp);
-  void updateFilesPriorities(const QVector<int> &fprio);
-  QVector<int> getFilePriorities() const;
-  bool allFiltered() const;
-  virtual int columnCount(const QModelIndex &parent=QModelIndex()) const;
-  virtual bool setData(const QModelIndex& index, const QVariant& value, int role = Qt::EditRole);
-  TorrentContentModelItem::ItemType itemType(const QModelIndex& index) const;
-  int getFileIndex(const QModelIndex& index);
-  virtual QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const;
-  virtual Qt::ItemFlags flags(const QModelIndex& index) const;
-  virtual QVariant headerData(int section, Qt::Orientation orientation, int role) const;
-  virtual QModelIndex index(int row, int column, const QModelIndex& parent = QModelIndex()) const;
-  virtual QModelIndex parent(const QModelIndex& index) const;
-  virtual int rowCount(const QModelIndex& parent = QModelIndex()) const;
-  void clear();
-  void setupModelData(const BitTorrent::TorrentInfo &info);
+    void updateFilesProgress(const QVector<qreal> &fp);
+    void updateFilesPriorities(const QVector<int> &fprio);
+    void updateFilesAvailability(const QVector<qreal> &fa);
+    QVector<int> getFilePriorities() const;
+    bool allFiltered() const;
+    virtual int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    virtual bool setData(const QModelIndex& index, const QVariant& value, int role = Qt::EditRole);
+    TorrentContentModelItem::ItemType itemType(const QModelIndex& index) const;
+    int getFileIndex(const QModelIndex& index);
+    virtual QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const;
+    virtual Qt::ItemFlags flags(const QModelIndex& index) const;
+    virtual QVariant headerData(int section, Qt::Orientation orientation, int role) const;
+    virtual QModelIndex index(int row, int column, const QModelIndex& parent = QModelIndex()) const;
+    virtual QModelIndex parent(const QModelIndex& index) const;
+    virtual int rowCount(const QModelIndex& parent = QModelIndex()) const;
+    void clear();
+    void setupModelData(const BitTorrent::TorrentInfo &info);
 
 signals:
-  void filteredFilesChanged();
+    void filteredFilesChanged();
 
 public slots:
-  void selectAll();
-  void selectNone();
+    void selectAll();
+    void selectNone();
 
 private:
-  TorrentContentModelFolder* m_rootItem;
-  QVector<TorrentContentModelFile*> m_filesIndex;
+    TorrentContentModelFolder *m_rootItem;
+    QVector<TorrentContentModelFile *> m_filesIndex;
 };
 
 #endif // TORRENTCONTENTMODEL_H
diff --git a/src/gui/torrentcontentmodelfile.cpp b/src/gui/torrentcontentmodelfile.cpp
index cabd8ed5c..df66cb9fc 100644
--- a/src/gui/torrentcontentmodelfile.cpp
+++ b/src/gui/torrentcontentmodelfile.cpp
@@ -32,43 +32,54 @@
 #include "torrentcontentmodelfolder.h"
 
 TorrentContentModelFile::TorrentContentModelFile(const QString &fileName, qulonglong fileSize,
-                                                 TorrentContentModelFolder* parent, int file_index)
-  : TorrentContentModelItem(parent)
-  , m_fileIndex(file_index)
+                                                 TorrentContentModelFolder *parent, int fileIndex)
+    : TorrentContentModelItem(parent)
+    , m_fileIndex(fileIndex)
 {
-  Q_ASSERT(parent);
+    Q_ASSERT(parent);
 
-  m_name = fileName;
+    m_name = fileName;
 
-  // Do not display incomplete extensions
-  if (m_name.endsWith(".!qB"))
-    m_name.chop(4);
+    // Do not display incomplete extensions
+    if (m_name.endsWith(".!qB"))
+        m_name.chop(4);
 
-  m_size = fileSize;
+    m_size = fileSize;
 }
 
 int TorrentContentModelFile::fileIndex() const
 {
-  return m_fileIndex;
+    return m_fileIndex;
 }
 
-void TorrentContentModelFile::setPriority(int new_prio, bool update_parent)
+void TorrentContentModelFile::setPriority(int newPriority, bool updateParent)
 {
-  Q_ASSERT(new_prio != prio::MIXED);
+    Q_ASSERT(newPriority != prio::MIXED);
 
-  if (m_priority == new_prio)
-    return;
+    if (m_priority == newPriority)
+        return;
 
-  m_priority = new_prio;
+    m_priority = newPriority;
 
-  // Update parent
-  if (update_parent)
-    m_parentItem->updatePriority();
+    // Update parent
+    if (updateParent)
+        m_parentItem->updatePriority();
 }
 
 void TorrentContentModelFile::setProgress(qreal progress)
 {
-  m_progress = progress;
-  m_remaining = (qulonglong)(m_size * (1.0 - m_progress));
-  Q_ASSERT(m_progress <= 1.);
+    m_progress = progress;
+    m_remaining = static_cast<qulonglong>(m_size * (1.0 - m_progress));
+    Q_ASSERT(m_progress <= 1.);
+}
+
+void TorrentContentModelFile::setAvailability(qreal availability)
+{
+    m_availability = availability;
+    Q_ASSERT(m_availability <= 1.);
+}
+
+TorrentContentModelItem::ItemType TorrentContentModelFile::itemType() const
+{
+    return FileType;
 }
diff --git a/src/gui/torrentcontentmodelfile.h b/src/gui/torrentcontentmodelfile.h
index d3861b717..f6d73e51a 100644
--- a/src/gui/torrentcontentmodelfile.h
+++ b/src/gui/torrentcontentmodelfile.h
@@ -33,19 +33,20 @@
 
 #include "torrentcontentmodelitem.h"
 
-class TorrentContentModelFile : public TorrentContentModelItem
+class TorrentContentModelFile: public TorrentContentModelItem
 {
 public:
-  TorrentContentModelFile(const QString &fileName, qulonglong fileSize,
-                          TorrentContentModelFolder* parent, int file_index);
+    TorrentContentModelFile(const QString &fileName, qulonglong fileSize,
+                            TorrentContentModelFolder *parent, int fileIndex);
 
-  int fileIndex() const;
-  void setPriority(int new_prio, bool update_parent = true);
-  void setProgress(qreal progress);
-  ItemType itemType() const { return FileType; }
+    int fileIndex() const;
+    void setPriority(int newPriority, bool updateParent = true) override;
+    void setProgress(qreal progress);
+    void setAvailability(qreal availability);
+    ItemType itemType() const override;
 
 private:
-  int m_fileIndex;
+    int m_fileIndex;
 };
 
 #endif // TORRENTCONTENTMODELFILE_H
diff --git a/src/gui/torrentcontentmodelfolder.cpp b/src/gui/torrentcontentmodelfolder.cpp
index 6695dbab9..09df1e671 100644
--- a/src/gui/torrentcontentmodelfolder.cpp
+++ b/src/gui/torrentcontentmodelfolder.cpp
@@ -31,136 +31,167 @@
 #include <QDebug>
 #include "torrentcontentmodelfolder.h"
 
-TorrentContentModelFolder::TorrentContentModelFolder(const QString& name, TorrentContentModelFolder* parent)
-  : TorrentContentModelItem(parent)
+TorrentContentModelFolder::TorrentContentModelFolder(const QString &name, TorrentContentModelFolder *parent)
+    : TorrentContentModelItem(parent)
 {
-  Q_ASSERT(parent);
-  m_name = name;
-  // Do not display incomplete extensions
-  if (m_name.endsWith(".!qB"))
-    m_name.chop(4);
+    Q_ASSERT(parent);
+    m_name = name;
+    // Do not display incomplete extensions
+    if (m_name.endsWith(".!qB"))
+        m_name.chop(4);
 }
 
-TorrentContentModelFolder::TorrentContentModelFolder(const QList<QVariant>& data)
-  : TorrentContentModelItem(0)
+TorrentContentModelFolder::TorrentContentModelFolder(const QList<QVariant> &data)
+    : TorrentContentModelItem(0)
 {
-  Q_ASSERT(data.size() == NB_COL);
-  m_itemData = data;
+    Q_ASSERT(data.size() == NB_COL);
+    m_itemData = data;
 }
 
 TorrentContentModelFolder::~TorrentContentModelFolder()
 {
-  qDeleteAll(m_childItems);
+    qDeleteAll(m_childItems);
+}
+
+TorrentContentModelItem::ItemType TorrentContentModelFolder::itemType() const
+{
+    return FolderType;
 }
 
 void TorrentContentModelFolder::deleteAllChildren()
 {
-  Q_ASSERT(isRootItem());
-  qDeleteAll(m_childItems);
-  m_childItems.clear();
+    Q_ASSERT(isRootItem());
+    qDeleteAll(m_childItems);
+    m_childItems.clear();
 }
 
-const QList<TorrentContentModelItem*>& TorrentContentModelFolder::children() const
+const QList<TorrentContentModelItem *> &TorrentContentModelFolder::children() const
 {
-  return m_childItems;
+    return m_childItems;
 }
 
-void TorrentContentModelFolder::appendChild(TorrentContentModelItem* item)
+void TorrentContentModelFolder::appendChild(TorrentContentModelItem *item)
 {
-  Q_ASSERT(item);
-  m_childItems.append(item);
-  // Update own size
-  if (item->itemType() == FileType)
-    increaseSize(item->size());
+    Q_ASSERT(item);
+    m_childItems.append(item);
+    // Update own size
+    if (item->itemType() == FileType)
+        increaseSize(item->size());
 }
 
-TorrentContentModelItem* TorrentContentModelFolder::child(int row) const
+TorrentContentModelItem *TorrentContentModelFolder::child(int row) const
 {
-  return m_childItems.value(row, 0);
+    return m_childItems.value(row, 0);
 }
 
-TorrentContentModelFolder* TorrentContentModelFolder::childFolderWithName(const QString& name) const
+TorrentContentModelFolder *TorrentContentModelFolder::childFolderWithName(const QString &name) const
 {
-  foreach (TorrentContentModelItem* child, m_childItems) {
-    if (child->itemType() == FolderType && child->name() == name)
-      return static_cast<TorrentContentModelFolder*>(child);
-  }
-  return 0;
+    foreach (TorrentContentModelItem *child, m_childItems)
+        if ((child->itemType() == FolderType) && (child->name() == name))
+            return static_cast<TorrentContentModelFolder *>(child);
+    return 0;
 }
 
 int TorrentContentModelFolder::childCount() const
 {
-  return m_childItems.count();
+    return m_childItems.count();
 }
 
 // Only non-root folders use this function
 void TorrentContentModelFolder::updatePriority()
 {
-  if (isRootItem())
-    return;
-
-  Q_ASSERT(!m_childItems.isEmpty());
-
-  // If all children have the same priority
-  // then the folder should have the same
-  // priority
-  const int prio = m_childItems.first()->priority();
-  for (int i=1; i<m_childItems.size(); ++i) {
-    if (m_childItems.at(i)->priority() != prio) {
-      setPriority(prio::MIXED);
-      return;
+    if (isRootItem())
+        return;
+
+    Q_ASSERT(!m_childItems.isEmpty());
+
+    // If all children have the same priority
+    // then the folder should have the same
+    // priority
+    const int prio = m_childItems.first()->priority();
+    for (int i = 1; i < m_childItems.size(); ++i) {
+        if (m_childItems.at(i)->priority() != prio) {
+            setPriority(prio::MIXED);
+            return;
+        }
     }
-  }
-  // All child items have the same priority
-  // Update own if necessary
-  setPriority(prio);
+    // All child items have the same priority
+    // Update own if necessary
+    setPriority(prio);
 }
 
-void TorrentContentModelFolder::setPriority(int new_prio, bool update_parent)
+void TorrentContentModelFolder::setPriority(int newPriority, bool updateParent)
 {
-  if (m_priority == new_prio)
-    return;
+    if (m_priority == newPriority)
+        return;
 
-  m_priority = new_prio;
+    m_priority = newPriority;
 
-  // Update parent priority
-  if (update_parent)
-    m_parentItem->updatePriority();
+    // Update parent priority
+    if (updateParent)
+        m_parentItem->updatePriority();
 
-  // Update children
-  if (m_priority != prio::MIXED) {
-    foreach (TorrentContentModelItem* child, m_childItems)
-      child->setPriority(m_priority, false);
-  }
+    // Update children
+    if (m_priority != prio::MIXED)
+        foreach (TorrentContentModelItem *child, m_childItems)
+            child->setPriority(m_priority, false);
 }
 
 void TorrentContentModelFolder::recalculateProgress()
 {
-  qreal tProgress = 0;
-  qulonglong tSize = 0;
-  qulonglong tRemaining = 0;
-  foreach (TorrentContentModelItem* child, m_childItems) {
-    if (child->priority() != prio::IGNORED) {
-      if (child->itemType() == FolderType)
-        static_cast<TorrentContentModelFolder*>(child)->recalculateProgress();
-      tProgress += child->progress() * child->size();
-      tSize += child->size();
-      tRemaining += child->remaining();
+    qreal tProgress = 0;
+    qulonglong tSize = 0;
+    qulonglong tRemaining = 0;
+    foreach (TorrentContentModelItem *child, m_childItems) {
+        if (child->priority() != prio::IGNORED) {
+            if (child->itemType() == FolderType)
+                static_cast<TorrentContentModelFolder *>(child)->recalculateProgress();
+            tProgress += child->progress() * child->size();
+            tSize += child->size();
+            tRemaining += child->remaining();
+        }
     }
-  }
 
-  if (!isRootItem() && tSize > 0) {
-    m_progress = tProgress / tSize;
-    m_remaining = tRemaining;
-    Q_ASSERT(m_progress <= 1.);
-  }
+    if (!isRootItem() && (tSize > 0)) {
+        m_progress = tProgress / tSize;
+        m_remaining = tRemaining;
+        Q_ASSERT(m_progress <= 1.);
+    }
+}
+
+void TorrentContentModelFolder::recalculateAvailability()
+{
+    qreal tAvailability = 0;
+    qulonglong tSize = 0;
+    bool foundAnyData = false;
+    foreach (TorrentContentModelItem* child, m_childItems) {
+        if (child->priority() == prio::IGNORED)
+            continue;
+
+        if (child->itemType() == FolderType)
+            static_cast<TorrentContentModelFolder*>(child)->recalculateAvailability();
+        const qreal childAvailability = child->availability();
+        if (childAvailability >= 0) { // -1 means "no data"
+            tAvailability += childAvailability * child->size();
+            foundAnyData = true;
+        }
+        tSize += child->size();
+    }
+
+    if (!isRootItem() && (tSize > 0) && foundAnyData) {
+        m_availability = tAvailability / tSize;
+        Q_ASSERT(m_availability <= 1.);
+    }
+    else {
+        m_availability = -1.;
+    }
 }
 
 void TorrentContentModelFolder::increaseSize(qulonglong delta)
 {
-  if (isRootItem())
-    return;
+    if (isRootItem())
+        return;
 
-  m_size += delta;
-  m_parentItem->increaseSize(delta);
+    m_size += delta;
+    m_parentItem->increaseSize(delta);
 }
diff --git a/src/gui/torrentcontentmodelfolder.h b/src/gui/torrentcontentmodelfolder.h
index ead57acd7..e136c9a2e 100644
--- a/src/gui/torrentcontentmodelfolder.h
+++ b/src/gui/torrentcontentmodelfolder.h
@@ -33,34 +33,35 @@
 
 #include "torrentcontentmodelitem.h"
 
-class TorrentContentModelFolder : public TorrentContentModelItem
+class TorrentContentModelFolder: public TorrentContentModelItem
 {
 public:
-  // Folder constructor
-  TorrentContentModelFolder(const QString& name, TorrentContentModelFolder* parent);
+    // Folder constructor
+    TorrentContentModelFolder(const QString& name, TorrentContentModelFolder* parent);
 
-  // Invisible root item constructor
-  TorrentContentModelFolder(const QList<QVariant>& data);
+    // Invisible root item constructor
+    TorrentContentModelFolder(const QList<QVariant>& data);
 
-  ~TorrentContentModelFolder();
+    ~TorrentContentModelFolder();
 
-  ItemType itemType() const { return FolderType; }
+    ItemType itemType() const override;
 
-  void increaseSize(qulonglong delta);
-  void recalculateProgress();
-  void updatePriority();
+    void increaseSize(qulonglong delta);
+    void recalculateProgress();
+    void recalculateAvailability();
+    void updatePriority();
 
-  void setPriority(int new_prio, bool update_parent = true);
+    void setPriority(int newPriority, bool updateParent = true) override;
 
-  void deleteAllChildren();
-  const QList<TorrentContentModelItem*>& children() const;
-  void appendChild(TorrentContentModelItem* item);
-  TorrentContentModelItem* child(int row) const;
-  TorrentContentModelFolder* childFolderWithName(const QString& name) const;
-  int childCount() const;
+    void deleteAllChildren();
+    const QList<TorrentContentModelItem*>& children() const;
+    void appendChild(TorrentContentModelItem* item);
+    TorrentContentModelItem* child(int row) const;
+    TorrentContentModelFolder* childFolderWithName(const QString& name) const;
+    int childCount() const;
 
 private:
-  QList<TorrentContentModelItem*> m_childItems;
+    QList<TorrentContentModelItem*> m_childItems;
 };
 
 #endif // TORRENTCONTENTMODELFOLDER_H
diff --git a/src/gui/torrentcontentmodelitem.cpp b/src/gui/torrentcontentmodelitem.cpp
index c841a0cb8..15a1988db 100644
--- a/src/gui/torrentcontentmodelitem.cpp
+++ b/src/gui/torrentcontentmodelitem.cpp
@@ -34,36 +34,40 @@
 #include "torrentcontentmodelfolder.h"
 #include <QDebug>
 
-TorrentContentModelItem::TorrentContentModelItem(TorrentContentModelFolder* parent)
-  : m_parentItem(parent)
-  , m_size(0)
-  , m_remaining(0)
-  , m_priority(prio::NORMAL)
-  , m_progress(0)
+TorrentContentModelItem::TorrentContentModelItem(TorrentContentModelFolder *parent)
+    : m_parentItem(parent)
+    , m_size(0)
+    , m_remaining(0)
+    , m_priority(prio::NORMAL)
+    , m_progress(0)
+    , m_availability(-1.)
 {
 }
 
-TorrentContentModelItem::~TorrentContentModelItem()
+TorrentContentModelItem::~TorrentContentModelItem() = default;
+
+bool TorrentContentModelItem::isRootItem() const
 {
+    return !m_parentItem;
 }
 
 QString TorrentContentModelItem::name() const
 {
-  Q_ASSERT(!isRootItem());
-  return m_name;
+    Q_ASSERT(!isRootItem());
+    return m_name;
 }
 
-void TorrentContentModelItem::setName(const QString& name)
+void TorrentContentModelItem::setName(const QString &name)
 {
-  Q_ASSERT(!isRootItem());
-  m_name = name;
+    Q_ASSERT(!isRootItem());
+    m_name = name;
 }
 
 qulonglong TorrentContentModelItem::size() const
 {
-  Q_ASSERT(!isRootItem());
+    Q_ASSERT(!isRootItem());
 
-  return m_size;
+    return m_size;
 }
 
 qreal TorrentContentModelItem::progress() const
@@ -81,47 +85,57 @@ qulonglong TorrentContentModelItem::remaining() const
     return m_remaining;
 }
 
+qreal TorrentContentModelItem::availability() const
+{
+    Q_ASSERT(!isRootItem());
+
+    return m_size > 0 ? m_availability : 0.;
+}
+
 int TorrentContentModelItem::priority() const
 {
-  Q_ASSERT(!isRootItem());
-  return m_priority;
+    Q_ASSERT(!isRootItem());
+    return m_priority;
 }
 
 int TorrentContentModelItem::columnCount() const
 {
-  return NB_COL;
+    return NB_COL;
 }
 
 QVariant TorrentContentModelItem::data(int column) const
 {
-  if (isRootItem())
-    return m_itemData.value(column);
-
-  switch(column) {
-  case COL_NAME:
-    return m_name;
-  case COL_PRIO:
-    return m_priority;
-  case COL_PROGRESS:
-    return progress();
-  case COL_SIZE:
-    return m_size;
-  case COL_REMAINING:
-    return remaining();
-  default:
-    Q_ASSERT(false);
-    return QVariant();
-  }
+    if (isRootItem())
+        return m_itemData.value(column);
+
+    switch (column) {
+    case COL_NAME:
+        return m_name;
+    case COL_PRIO:
+        return m_priority;
+    case COL_PROGRESS:
+        return progress();
+    case COL_SIZE:
+        return m_size;
+    case COL_REMAINING:
+        return remaining();
+    case COL_AVAILABILITY:
+        return availability();
+    default:
+        Q_ASSERT(false);
+        return QVariant();
+    }
 }
 
 int TorrentContentModelItem::row() const
 {
-  if (m_parentItem)
-    return m_parentItem->children().indexOf(const_cast<TorrentContentModelItem*>(this));
-  return 0;
+    if (m_parentItem)
+        return m_parentItem->children().indexOf(const_cast<TorrentContentModelItem *>(this));
+    return 0;
 }
 
-TorrentContentModelFolder* TorrentContentModelItem::parent() const
+TorrentContentModelFolder *TorrentContentModelItem::parent() const
 {
-  return m_parentItem;
+    return m_parentItem;
 }
+
diff --git a/src/gui/torrentcontentmodelitem.h b/src/gui/torrentcontentmodelitem.h
index a21398f80..115dd76c2 100644
--- a/src/gui/torrentcontentmodelitem.h
+++ b/src/gui/torrentcontentmodelitem.h
@@ -34,48 +34,74 @@
 #include <QList>
 #include <QVariant>
 
-namespace prio {
-enum FilePriority {IGNORED=0, NORMAL=1, HIGH=6, MAXIMUM=7, MIXED=-1};
+namespace prio
+{
+    enum FilePriority
+    {
+        IGNORED=0,
+        NORMAL=1,
+        HIGH=6,
+        MAXIMUM=7,
+        MIXED=-1
+    };
 }
 
 class TorrentContentModelFolder;
 
-class TorrentContentModelItem {
+class TorrentContentModelItem
+{
 public:
-  enum TreeItemColumns {COL_NAME, COL_SIZE, COL_PROGRESS, COL_PRIO, COL_REMAINING, NB_COL};
-  enum ItemType { FileType, FolderType };
+    enum TreeItemColumns
+    {
+        COL_NAME,
+        COL_SIZE,
+        COL_PROGRESS,
+        COL_PRIO,
+        COL_REMAINING,
+        COL_AVAILABILITY,
+        NB_COL
+    };
 
-  TorrentContentModelItem(TorrentContentModelFolder* parent);
-  virtual ~TorrentContentModelItem();
+    enum ItemType
+    {
+        FileType,
+        FolderType
+    };
 
-  inline bool isRootItem() const { return !m_parentItem; }
-  TorrentContentModelFolder* parent() const;
-  virtual ItemType itemType() const = 0;
+    TorrentContentModelItem(TorrentContentModelFolder *parent);
+    virtual ~TorrentContentModelItem();
 
-  QString name() const;
-  void setName(const QString& name);
+    bool isRootItem() const;
+    TorrentContentModelFolder *parent() const;
+    virtual ItemType itemType() const = 0;
 
-  qulonglong size() const;
-  qreal progress() const;
-  qulonglong remaining() const;
+    QString name() const;
+    void setName(const QString &name);
 
-  int priority() const;
-  virtual void setPriority(int new_prio, bool update_parent = true) = 0;
+    qulonglong size() const;
+    qreal progress() const;
+    qulonglong remaining() const;
 
-  int columnCount() const;
-  QVariant data(int column) const;
-  int row() const;
+    qreal availability() const;
+
+    int priority() const;
+    virtual void setPriority(int newPriority, bool updateParent = true) = 0;
+
+    int columnCount() const;
+    QVariant data(int column) const;
+    int row() const;
 
 protected:
-  TorrentContentModelFolder* m_parentItem;
-  // Root item members
-  QList<QVariant> m_itemData;
-  // Non-root item members
-  QString m_name;
-  qulonglong m_size;
-  qulonglong m_remaining;
-  int m_priority;
-  qreal m_progress;
+    TorrentContentModelFolder *m_parentItem;
+    // Root item members
+    QList<QVariant> m_itemData;
+    // Non-root item members
+    QString m_name;
+    qulonglong m_size;
+    qulonglong m_remaining;
+    int m_priority;
+    qreal m_progress;
+    qreal m_availability;
 };
 
 #endif // TORRENTCONTENTMODELITEM_H