replace combined stateUpdated signal with individual events

src/ui/HeaderBar.h

@@ -4,21 +4,27 @@
 
 #include <QWidget>
 
+#include "BossWaveUpdatedEvent.h"
+#include "BuildingBlocksChangedEvent.h"
+#include "EventHandler.h"
+#include "GameSpeedChangedEvent.h"
 #include "Tick.h"
+#include "TickAdvancedEvent.h"
 
 class QLabel;
 class QPushButton;
 
-class HeaderBar : public QWidget
+class HeaderBar : public QWidget,
+                  public CombinedEventHandler<TickAdvancedEvent,
+                                              BuildingBlocksChangedEvent,
+                                              GameSpeedChangedEvent,
+                                              BossWaveUpdatedEvent>
 {
     Q_OBJECT
 
 public:
     explicit HeaderBar(QWidget* parent = nullptr);
-
-public slots:
-    void onStateUpdated(Tick tick, int buildingBlocks, double gameSpeed,
-                        int bossCounter, Tick bossCountdownTicks);
+    ~HeaderBar() override;
 
 signals:
     void speedChanged(double multiplier);
@@ -27,6 +33,11 @@ private slots:
     void onSpeedButton(int index);
 
 private:
+    void handleEvent(std::shared_ptr<const TickAdvancedEvent> event) override;
+    void handleEvent(std::shared_ptr<const BuildingBlocksChangedEvent> event) override;
+    void handleEvent(std::shared_ptr<const GameSpeedChangedEvent> event) override;
+    void handleEvent(std::shared_ptr<const BossWaveUpdatedEvent> event) override;
+
     QLabel*                  m_timeLabel;
     QLabel*                  m_blocksLabel;
     QLabel*                  m_bossLabel;