Basic logic done. Need to change the timer source to get ms. Also need to replace with paddle app in displayApp.cpp and ApplicationList.cpp later.

src/displayapp/screens/StopWatch.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "Screen.h"
+#include "components/datetime/DateTimeController.h"
+#include "../LittleVgl.h"
+
+#include <chrono>
+
+namespace Pinetime::Applications::Screens {
+
+  enum class States { INIT, RUNNING, HALTED };
+
+  enum class Events { PLAY, PAUSE, STOP };
+
+  class StopWatch : public Screen {
+  public:
+    StopWatch(DisplayApp* app, const Pinetime::Controllers::DateTime& dateTime);
+    ~StopWatch() override;
+    bool Refresh() override;
+    bool OnButtonPushed() override;
+    bool OnTouchEvent(uint16_t x, uint16_t y) override;
+
+  private:
+    using timeUnit = std::chrono::time_point<std::chrono::system_clock, std::chrono::nanoseconds>;
+    const Pinetime::Controllers::DateTime& dateTime;
+    bool running;
+    States currentState;
+    Events currentEvent;
+    timeUnit startTime;
+    int64_t timeElapsed;
+    lv_obj_t *time, *msecTime;
+  };
+}