Use Qt5 connect() style in CategoryFilterWidget

src/gui/categoryfilterwidget.cpp

@@ -81,12 +81,12 @@ CategoryFilterWidget::CategoryFilterWidget(QWidget *parent)
     sortByColumn(0, Qt::AscendingOrder);
     setCurrentIndex(model()->index(0, 0));
 
-    connect(this, SIGNAL(collapsed(QModelIndex)), SLOT(callUpdateGeometry()));
-    connect(this, SIGNAL(expanded(QModelIndex)), SLOT(callUpdateGeometry()));
-    connect(this, SIGNAL(customContextMenuRequested(QPoint)), SLOT(showMenu(QPoint)));
-    connect(selectionModel(), SIGNAL(currentRowChanged(QModelIndex,QModelIndex))
-            , SLOT(onCurrentRowChanged(QModelIndex,QModelIndex)));
-    connect(model(), SIGNAL(modelReset()), SLOT(callUpdateGeometry()));
+    connect(this, &QTreeView::collapsed, this, &CategoryFilterWidget::callUpdateGeometry);
+    connect(this, &QTreeView::expanded, this, &CategoryFilterWidget::callUpdateGeometry);
+    connect(this, &QWidget::customContextMenuRequested, this, &CategoryFilterWidget::showMenu);
+    connect(selectionModel(), &QItemSelectionModel::currentRowChanged
+            , this, &CategoryFilterWidget::onCurrentRowChanged);
+    connect(model(), &QAbstractItemModel::modelReset, this, &CategoryFilterWidget::callUpdateGeometry);
 }
 
 QString CategoryFilterWidget::currentCategory() const
@@ -113,7 +113,7 @@ void CategoryFilterWidget::showMenu(QPoint)
     QAction *addAct = menu.addAction(
                           GuiIconProvider::instance()->getIcon("list-add")
                           , tr("Add category..."));
-    connect(addAct, SIGNAL(triggered()), SLOT(addCategory()));
+    connect(addAct, &QAction::triggered, this, &CategoryFilterWidget::addCategory);
 
     auto selectedRows = selectionModel()->selectedRows();
     if (!selectedRows.empty() && !CategoryFilterModel::isSpecialItem(selectedRows.first())) {
@@ -121,36 +121,36 @@ void CategoryFilterWidget::showMenu(QPoint)
             QAction *addSubAct = menu.addAction(
                         GuiIconProvider::instance()->getIcon("list-add")
                         , tr("Add subcategory..."));
-            connect(addSubAct, SIGNAL(triggered()), SLOT(addSubcategory()));
+            connect(addSubAct, &QAction::triggered, this, &CategoryFilterWidget::addSubcategory);
         }
 
         QAction *removeAct = menu.addAction(
                         GuiIconProvider::instance()->getIcon("list-remove")
                         , tr("Remove category"));
-        connect(removeAct, SIGNAL(triggered()), SLOT(removeCategory()));
+        connect(removeAct, &QAction::triggered, this, &CategoryFilterWidget::removeCategory);
     }
 
     QAction *removeUnusedAct = menu.addAction(
                                    GuiIconProvider::instance()->getIcon("list-remove")
                                    , tr("Remove unused categories"));
-    connect(removeUnusedAct, SIGNAL(triggered()), SLOT(removeUnusedCategories()));
+    connect(removeUnusedAct, &QAction::triggered, this, &CategoryFilterWidget::removeUnusedCategories);
 
     menu.addSeparator();
 
     QAction *startAct = menu.addAction(
                             GuiIconProvider::instance()->getIcon("media-playback-start")
                             , tr("Resume torrents"));
-    connect(startAct, SIGNAL(triggered()), SIGNAL(actionResumeTorrentsTriggered()));
+    connect(startAct, &QAction::triggered, this, &CategoryFilterWidget::actionResumeTorrentsTriggered);
 
     QAction *pauseAct = menu.addAction(
                             GuiIconProvider::instance()->getIcon("media-playback-pause")
                             , tr("Pause torrents"));
-    connect(pauseAct, SIGNAL(triggered()), SIGNAL(actionPauseTorrentsTriggered()));
+    connect(pauseAct, &QAction::triggered, this, &CategoryFilterWidget::actionPauseTorrentsTriggered);
 
     QAction *deleteTorrentsAct = menu.addAction(
                                      GuiIconProvider::instance()->getIcon("edit-delete")
                                      , tr("Delete torrents"));
-    connect(deleteTorrentsAct, SIGNAL(triggered()), SIGNAL(actionDeleteTorrentsTriggered()));
+    connect(deleteTorrentsAct, &QAction::triggered, this, &CategoryFilterWidget::actionDeleteTorrentsTriggered);
 
     menu.exec(QCursor::pos());
 }
@@ -167,6 +167,9 @@ void CategoryFilterWidget::callUpdateGeometry()
 
 QSize CategoryFilterWidget::sizeHint() const
 {
+    // The sizeHint must depend on viewportSizeHint,
+    // otherwise widget will not correctly adjust the
+    // size when subcategories are used.
     const QSize viewportSize {viewportSizeHint()};
     return {
         viewportSize.width(),

src/gui/categoryfilterwidget.h

@@ -31,6 +31,7 @@
 class CategoryFilterWidget: public QTreeView
 {
     Q_OBJECT
+    Q_DISABLE_COPY(CategoryFilterWidget)
 
 public:
     explicit CategoryFilterWidget(QWidget *parent = nullptr);