Creating time keeping for the game using c++ threads instead of relying on GTK

src/minefield.cpp

@@ -12,6 +12,20 @@ MineField::MineField(int cols, int rows, int mines): m_rows(rows),
   }
 }
 
+void MineField::timerTick() {
+
+  auto start = std::chrono::system_clock::now();
+
+  while((m_exploded == false) && (m_gameWon == false)) {  
+    std::this_thread::sleep_for(std::chrono::milliseconds(200));
+    auto now = std::chrono::system_clock::now();
+    const auto duration = now - start;
+    std::chrono::milliseconds ms = std::chrono::duration_cast<std::chrono::milliseconds>(duration); 
+    m_time += duration.count();
+    timerSignal.emit(m_time);
+    start = std::chrono::system_clock::now();
+  }
+}
 
 void MineField::initBombs(int x, int y) {
 
@@ -28,6 +42,11 @@ void MineField::initBombs(int x, int y) {
     m_cells.at(position)->isBomb = true;
     --remainingMines;
   }
+
+  //init the timer to zero and start the timer thread
+  m_time = 0;
+  timerThread = std::thread(&MineField::timerTick, this);
+  timerThread.detach(); //not sure if this is okay
 }
 
 bool MineField::openCell(int x, int y) {