Added opened/closed signals to PanelWidget

src/Insight/UserInterfaces/InsightWindow/Widgets/PanelWidget.cpp

@@ -84,6 +84,13 @@ namespace Bloom::Widgets
             }
         }
 
+        if (event->type() == QEvent::Type::Close || event->type() == QEvent::Type::Hide) {
+            emit this->closed();
+
+        } else if (event->type() == QEvent::Type::Show) {
+            emit this->opened();
+        }
+
         return QFrame::event(event);
     }
 

src/Insight/UserInterfaces/InsightWindow/Widgets/PanelWidget.hpp

@@ -73,6 +73,10 @@ namespace Bloom::Widgets
          */
         void updateVisibility();
 
+    signals:
+        void closed();
+        void opened();
+
     protected:
         int handleSize = 10;
         int minimumResize = 10;