Add debug logging for observer updates in Observer and ObserverManager

Author: patrickfournier

src/ZooLib/Observer.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <gtk/gtk.h>
 #include <vector>
 
 #include "StateComponent.hpp"
@@ -94,7 +95,16 @@ namespace ZooLib
                 auto &version = m_ObservedComponentVersions[i];
                 if (observedComponent->GetVersion() != version)
                 {
+#if DEBUG_OBSERVERS
+                    g_debug("Observed component %s changed from version %lu to %lu.", typeid(*observedComponent).name(),
+                            version, observedComponent->GetVersion());
+#endif
+
                     UpdateImplementation();
+
+#if DEBUG_OBSERVERS
+                    g_debug("Updated observer %s.", typeid(*this).name());
+#endif
                     break;
                 }
             }

src/ZooLib/ObserverManager.hpp

@@ -139,15 +139,33 @@ namespace ZooLib
                 m_NeedsSorting = false;
             }
 
+#if DEBUG_OBSERVER_MANAGER
+            g_debug("ObserverManager::NotifyObservers() notifying %zu observers", m_SortedObservers.size());
+#endif
+
             for (auto observer: m_SortedObservers)
             {
                 if (std::ranges::find(m_DeletedObservers, observer) != m_DeletedObservers.end())
                 {
                     continue;
                 }
 
+#if DEBUG_OBSERVER_MANAGER
+                g_debug("ObserverManager::NotifyObservers() calling observer %s (%p)", typeid(*observer).name(),
+                        observer);
+#endif
+
                 observer->Update();
+
+#if DEBUG_OBSERVER_MANAGER
+                g_debug("ObserverManager::NotifyObservers() done calling observer %s (%p)", typeid(*observer).name(),
+                        observer);
+#endif
             }
+
+#if DEBUG_OBSERVER_MANAGER
+            g_debug("ObserverManager::NotifyObservers() done notifying observers\n");
+#endif
         }
     };
 }