Merge label filter into TransferListSortModel

This also fixes a bug that when label filter contains special symbols
from regex, the label filter may match torrents with multiple different
labels.

src/transferlistsortmodel.cpp

@@ -45,6 +45,22 @@ void TransferListSortModel::setStatusFilter(const TorrentFilter::TorrentFilter &
   }
 }
 
+void TransferListSortModel::setLabelFilter(QString const& label) {
+  if (!labelFilterEnabled || labelFilter != label) {
+    labelFilterEnabled = true;
+    labelFilter = label;
+    invalidateFilter();
+  }
+}
+
+void TransferListSortModel::disableLabelFilter() {
+  if (labelFilterEnabled) {
+    labelFilterEnabled = false;
+    labelFilter = QString();
+    invalidateFilter();
+  }
+}
+
 bool TransferListSortModel::lessThan(const QModelIndex &left, const QModelIndex &right) const {
   const int column  = sortColumn();
 
@@ -180,6 +196,7 @@ bool TransferListSortModel::lessThan(const QModelIndex &left, const QModelIndex
 
 bool TransferListSortModel::filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const {
   return matchStatusFilter(sourceRow, sourceParent)
+      && matchLabelFilter(sourceRow, sourceParent)
       && QSortFilterProxyModel::filterAcceptsRow(sourceRow, sourceParent);
 }
 
@@ -225,3 +242,14 @@ bool TransferListSortModel::matchStatusFilter(int sourceRow, const QModelIndex &
     return false;
   }
 }
+
+bool TransferListSortModel::matchLabelFilter(int sourceRow, const QModelIndex &sourceParent) const {
+  if (!labelFilterEnabled)
+    return true;
+
+  QAbstractItemModel *model = sourceModel();
+  if (!model)
+    return false;
+
+  return model->index(sourceRow, TorrentModelItem::TR_LABEL, sourceParent).data().toString() == labelFilter;
+}

src/transferlistsortmodel.h

@@ -41,15 +41,21 @@ public:
   TransferListSortModel(QObject *parent = 0);
 
   void setStatusFilter(const TorrentFilter::TorrentFilter &filter);
+  void setLabelFilter(QString const& label);
+  void disableLabelFilter();
 
 private:
   bool lessThan(const QModelIndex &left, const QModelIndex &right) const;
   bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const;
 
   bool matchStatusFilter(int sourceRow, const QModelIndex &sourceParent) const;
+  bool matchLabelFilter(int sourceRow, const QModelIndex &sourceParent) const;
 
 private:
   TorrentFilter::TorrentFilter filter0;
+
+  bool labelFilterEnabled;
+  QString labelFilter;
 };
 
 #endif // TRANSFERLISTSORTMODEL_H

src/transferlistwidget.cpp

@@ -81,16 +81,9 @@ TransferListWidget::TransferListWidget(QWidget *parent, MainWindow *main_window,
   // Create transfer list model
   listModel = new TorrentModel(this);
 
-  // Set Sort/Filter proxy
-  labelFilterModel = new QSortFilterProxyModel();
-  labelFilterModel->setDynamicSortFilter(true);
-  labelFilterModel->setSourceModel(listModel);
-  labelFilterModel->setFilterKeyColumn(TorrentModelItem::TR_LABEL);
-  labelFilterModel->setFilterRole(Qt::DisplayRole);
-
   nameFilterModel = new TransferListSortModel();
   nameFilterModel->setDynamicSortFilter(true);
-  nameFilterModel->setSourceModel(labelFilterModel);
+  nameFilterModel->setSourceModel(listModel);
   nameFilterModel->setFilterKeyColumn(TorrentModelItem::TR_NAME);
   nameFilterModel->setFilterRole(Qt::DisplayRole);
   nameFilterModel->setSortCaseSensitivity(Qt::CaseInsensitive);
@@ -165,7 +158,6 @@ TransferListWidget::~TransferListWidget() {
   // Save settings
   saveSettings();
   // Clean up
-  delete labelFilterModel;
   delete nameFilterModel;
   delete listModel;
   delete listDelegate;
@@ -198,14 +190,14 @@ inline QString TransferListWidget::getHashFromRow(int row) const {
 inline QModelIndex TransferListWidget::mapToSource(const QModelIndex &index) const {
   Q_ASSERT(index.isValid());
   if (index.model() == nameFilterModel)
-    return labelFilterModel->mapToSource(nameFilterModel->mapToSource(index));
+    return nameFilterModel->mapToSource(index);
-  return labelFilterModel->mapToSource(index);
+  return index;
 }
 
 inline QModelIndex TransferListWidget::mapFromSource(const QModelIndex &index) const {
   Q_ASSERT(index.isValid());
-  Q_ASSERT(index.model() == labelFilterModel);
+  Q_ASSERT(index.model() == nameFilterModel);
-  return nameFilterModel->mapFromSource(labelFilterModel->mapFromSource(index));
+  return nameFilterModel->mapFromSource(index);
 }
 
 void TransferListWidget::torrentDoubleClicked(const QModelIndex& index) {
@@ -895,15 +887,15 @@ void TransferListWidget::currentChanged(const QModelIndex& current, const QModel
 
 void TransferListWidget::applyLabelFilter(QString label) {
   if (label == "all") {
-    labelFilterModel->setFilterRegExp(QRegExp());
+    nameFilterModel->disableLabelFilter();
     return;
   }
   if (label == "none") {
-    labelFilterModel->setFilterRegExp(QRegExp("^$"));
+    nameFilterModel->setLabelFilter(QString());
     return;
   }
   qDebug("Applying Label filter: %s", qPrintable(label));
-  labelFilterModel->setFilterRegExp(QRegExp("^" + QRegExp::escape(label) + "$", Qt::CaseSensitive));
+  nameFilterModel->setLabelFilter(label);
 }
 
 void TransferListWidget::applyNameFilter(const QString& name) {

src/transferlistwidget.h

@@ -113,7 +113,6 @@ private:
   TransferListDelegate *listDelegate;
   TorrentModel *listModel;
   TransferListSortModel *nameFilterModel;
-  QSortFilterProxyModel *labelFilterModel;
   QBtSession* BTSession;
   MainWindow *main_window;
   QShortcut *editHotkey;