implement ui

src/ui/HeaderBar.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <vector>
+
+#include <QWidget>
+
+#include "Tick.h"
+
+class QLabel;
+class QPushButton;
+
+class HeaderBar : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit HeaderBar(QWidget* parent = nullptr);
+
+public slots:
+    void onStateUpdated(Tick tick, int buildingBlocks, double gameSpeed);
+
+signals:
+    void speedChanged(double multiplier);
+
+private slots:
+    void onSpeedButton(int index);
+
+private:
+    QLabel*                  m_timeLabel;
+    QLabel*                  m_blocksLabel;
+    std::vector<QPushButton*> m_speedButtons;
+
+    static const double kSpeeds[];
+    static const int    kSpeedCount;
+};