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.cpp

@@ -0,0 +1,73 @@
+#include "StopWatch.h"
+
+#include "Screen.h"
+#include "lvgl/lvgl.h"
+
+#include <tuple>
+
+// Anonymous namespace for local functions
+namespace {
+  std::tuple<int, int, int> convertMilliSecsToSegments(const int64_t& currentTime) {
+    const int milliSecs = (currentTime % 1000); // Get only the first two digits and ignore the last
+    const int secs = (currentTime / 1000) % 60;
+    const int mins = (currentTime / 1000) / 60;
+    return std::make_tuple(mins, secs, milliSecs);
+  }
+}
+using namespace Pinetime::Applications::Screens;
+
+StopWatch::StopWatch(DisplayApp* app, const Pinetime::Controllers::DateTime& dateTime)
+  : Screen(app), dateTime {dateTime}, running {true}, currentState {States::INIT}, currentEvent {Events::PLAY}, startTime {},
+    timeElapsed {} {
+
+  time = lv_label_create(lv_scr_act(), nullptr);
+  lv_obj_set_style_local_text_font(time, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &jetbrains_mono_extrabold_compressed);
+  lv_obj_align(time, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 0);
+
+  msecTime = lv_label_create(lv_scr_act(), nullptr);
+  lv_obj_set_style_local_text_font(msecTime, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &jetbrains_mono_bold_20);
+  lv_obj_align(msecTime, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 115, 60);
+}
+
+StopWatch::~StopWatch() {
+  lv_obj_clean(lv_scr_act());
+}
+
+bool StopWatch::Refresh() {
+
+  switch (currentState) {
+    // Init state when an user first opens the app
+    // and when a stop/reset button is pressed
+    case States::INIT: {
+      // The initial default value
+      lv_label_set_text(time, "00:00");
+      lv_label_set_text(msecTime, "00");
+      if (currentEvent == Events::PLAY) {
+        startTime = dateTime.CurrentDateTime();
+        currentState = States::RUNNING;
+      }
+      break;
+    }
+    case States::RUNNING: {
+      auto delta = std::chrono::duration_cast<std::chrono::microseconds>(dateTime.CurrentDateTime() - startTime);
+      timeElapsed = delta.count();
+      auto timeSeparated = convertMilliSecsToSegments(timeElapsed);
+      lv_label_set_text_fmt(time, "%02d:%02d", std::get<0>(timeSeparated), std::get<1>(timeSeparated));
+      break;
+    }
+    case States::HALTED: {
+
+      break;
+    }
+  }
+  return running;
+}
+
+bool StopWatch::OnButtonPushed() {
+  running = false;
+  return true;
+}
+
+bool StopWatch::OnTouchEvent(uint16_t x, uint16_t y) {
+  return true;
+}