Made progress calculation more efficient in torrent content model

Stop to address issue #24.

src/torrentcontentmodel.cpp

@@ -59,6 +59,8 @@ void TorrentContentModel::updateFilesProgress(const std::vector<libtorrent::size
   for (uint i = 0; i < fp.size(); ++i) {
     m_filesIndex[i]->setProgress(fp[i]);
   }
+  // Update folders progress in the tree
+  m_rootItem->recalculateProgress();
   emit dataChanged(index(0,0), index(rowCount(), columnCount()));
 }
 
@@ -118,6 +120,8 @@ bool TorrentContentModel::setData(const QModelIndex& index, const QVariant& valu
         item->setPriority(prio::IGNORED);
       else
         item->setPriority(prio::NORMAL);
+      // Update folders progress in the tree
+      m_rootItem->recalculateProgress();
       emit dataChanged(this->index(0,0), this->index(rowCount()-1, columnCount()-1));
       emit filteredFilesChanged();
     }

src/torrentcontentmodelfile.cpp

@@ -69,15 +69,12 @@ void TorrentContentModelFile::setPriority(int new_prio, bool update_parent)
   m_priority = new_prio;
 
   // Update parent
-  if (update_parent) {
-    m_parentItem->updateProgress();
+  if (update_parent)
     m_parentItem->updatePriority();
-  }
 }
 
 void TorrentContentModelFile::setProgress(qulonglong done)
 {
   m_totalDone = done;
   Q_ASSERT(m_totalDone <= m_size);
-  m_parentItem->updateProgress();
 }

src/torrentcontentmodelfolder.cpp

@@ -131,25 +131,22 @@ void TorrentContentModelFolder::setPriority(int new_prio, bool update_parent)
     foreach (TorrentContentModelItem* child, m_childItems)
       child->setPriority(m_priority, false);
   }
-
-  updateProgress();
 }
 
-void TorrentContentModelFolder::updateProgress()
+void TorrentContentModelFolder::recalculateProgress()
 {
-  if (isRootItem())
-    return;
-
-  qulonglong total_done = 0;
+  qulonglong totalDone = 0;
   foreach (TorrentContentModelItem* child, m_childItems) {
-    if (child->priority() > 0)
-      total_done += child->totalDone();
+    if (child->priority() != prio::IGNORED) {
+      if (child->itemType() == FolderType)
+        static_cast<TorrentContentModelFolder*>(child)->recalculateProgress();
+      totalDone += child->totalDone();
+    }
   }
 
-  Q_ASSERT(total_done <= m_size);
-  if (total_done != m_totalDone) {
-    m_totalDone = total_done;
-    m_parentItem->updateProgress();
+  if (!isRootItem()) {
+    m_totalDone = totalDone;
+    Q_ASSERT(m_totalDone <= m_size);
   }
 }
 

src/torrentcontentmodelfolder.h

@@ -47,7 +47,7 @@ public:
   ItemType itemType() const { return FolderType; }
 
   void increaseSize(qulonglong delta);
-  void updateProgress();
+  void recalculateProgress();
   void updatePriority();
 
   void setPriority(int new_prio, bool update_parent = true);