More simplifications for SampleDesigner Toolbox

Please read the commit comments for details

GUI/Views/SampleDesigner/SampleToolBoxTreeWidget.cpp

@@ -159,8 +159,7 @@ void SampleToolBoxTreeWidget::addGroupView(QTreeWidgetItem* parent, bool iconMod
     embed_item->setFlags(Qt::ItemIsEnabled);
     SampleToolBoxGroupView* view = new SampleToolBoxGroupView(this);
     view->setViewMode(iconMode ? QListView::IconMode : QListView::ListMode);
-    connect(view, SIGNAL(pressed(QString, QString, QPoint)), this,
-            SIGNAL(pressed(QString, QString, QPoint)));
+    connect(view, &SampleToolBoxGroupView::pressed, this, &SampleToolBoxTreeWidget::pressed);
     setItemWidget(embed_item, 0, view);
 }