add boss wave counter and countdown to the title bar

src/ui/GameWorldView.cpp

@@ -240,7 +240,9 @@ void GameWorldView::onFrame()
     // Emit state update for header bar / build grid
     emit stateUpdated(m_sim->currentTick(),
                       m_sim->buildingBlocksStock(),
-                      m_gameSpeedMultiplier);
+                      m_gameSpeedMultiplier,
+                      m_sim->bossWaveCounter(),
+                      m_sim->bossCountdownTicks());
 
     // Game over check
     if (m_sim->isGameOver() && !m_gameOverShown)
@@ -1390,7 +1392,9 @@ void GameWorldView::setGameSpeed(double multiplier)
     m_gameSpeedMultiplier = multiplier;
     emit stateUpdated(m_sim->currentTick(),
                       m_sim->buildingBlocksStock(),
-                      m_gameSpeedMultiplier);
+                      m_gameSpeedMultiplier,
+                      m_sim->bossWaveCounter(),
+                      m_sim->bossCountdownTicks());
 }
 
 void GameWorldView::resetForNewGame()

src/ui/GameWorldView.h

@@ -47,7 +47,7 @@ public:
 
 signals:
     void selectionChanged(const std::vector<BuildingId>& ids);
-    void stateUpdated(Tick tick, int blocks, double speed);
+    void stateUpdated(Tick tick, int blocks, double speed, int bossCounter, Tick bossCountdownTicks);
     void gameOver();
     void builderModeExited();
     void blueprintModeExited();

src/ui/HeaderBar.cpp

@@ -22,9 +22,11 @@ HeaderBar::HeaderBar(QWidget* parent)
 
     m_timeLabel   = new QLabel("00:00", this);
     m_blocksLabel = new QLabel("Blocks: 0", this);
+    m_bossLabel   = new QLabel("Boss Wave #1  Next boss: 5:00", this);
     layout->addWidget(m_timeLabel);
     layout->addWidget(m_blocksLabel);
     layout->addStretch();
+    layout->addWidget(m_bossLabel);
 
     const char* labels[] = { "0x", "0.5x", "1x", "2x", "4x" };
     QSignalMapper* mapper = new QSignalMapper(this);
@@ -43,7 +45,8 @@ HeaderBar::HeaderBar(QWidget* parent)
     setFixedHeight(sizeHint().height());
 }
 
-void HeaderBar::onStateUpdated(Tick tick, int buildingBlocks, double gameSpeed)
+void HeaderBar::onStateUpdated(Tick tick, int buildingBlocks, double gameSpeed,
+                               int bossCounter, Tick bossCountdownTicks)
 {
     const int totalSeconds = static_cast<int>(ticksToSeconds(tick));
     const int minutes = totalSeconds / 60;
@@ -56,6 +59,16 @@ void HeaderBar::onStateUpdated(Tick tick, int buildingBlocks, double gameSpeed)
 
     m_blocksLabel->setText(QString("Blocks: %1").arg(buildingBlocks));
 
+    const int bossSeconds = static_cast<int>(ticksToSeconds(
+        bossCountdownTicks > 0 ? bossCountdownTicks : 0));
+    const int bossMin = bossSeconds / 60;
+    const int bossSec = bossSeconds % 60;
+    m_bossLabel->setText(
+        QString("Boss Wave #%1  Next boss: %2:%3")
+            .arg(bossCounter)
+            .arg(bossMin)
+            .arg(bossSec, 2, 10, QChar('0')));
+
     for (int i = 0; i < kSpeedCount; ++i)
     {
         const bool active = (std::abs(kSpeeds[i] - gameSpeed) < 0.001);

src/ui/HeaderBar.h

@@ -17,7 +17,8 @@ public:
     explicit HeaderBar(QWidget* parent = nullptr);
 
 public slots:
-    void onStateUpdated(Tick tick, int buildingBlocks, double gameSpeed);
+    void onStateUpdated(Tick tick, int buildingBlocks, double gameSpeed,
+                        int bossCounter, Tick bossCountdownTicks);
 
 signals:
     void speedChanged(double multiplier);
@@ -28,6 +29,7 @@ private slots:
 private:
     QLabel*                  m_timeLabel;
     QLabel*                  m_blocksLabel;
+    QLabel*                  m_bossLabel;
     std::vector<QPushButton*> m_speedButtons;
 
     static const double kSpeeds[];