add a new aoclocklabel class that is a QLabel with fancy DR-Style timing features

WIP

include/aoclocklabel.h

@@ -0,0 +1,29 @@
+#ifndef AOCLOCKLABEL_H
+#define AOCLOCKLABEL_H
+
+#include <QLabel>
+#include <QBasicTimer>
+#include <QTimerEvent>
+#include <QTime>
+
+class AOClockLabel : public QLabel {
+  Q_OBJECT
+
+public:
+  AOClockLabel(QWidget *parent);
+  void start();
+  void start(QTime p_time);
+  void pause();
+  void resume();
+  void stop();
+
+protected:
+  void timerEvent(QTimerEvent *event) override;
+
+private:
+    QBasicTimer timer;
+    QTime starting_time;
+    QTime target_time;
+};
+
+#endif // AOCLOCKLABEL_H

src/aoclocklabel.cpp

@@ -0,0 +1,35 @@
+#include "aoclocklabel.h"
+
+AOClockLabel::AOClockLabel(QWidget *parent) : QLabel(parent) {}
+
+void AOClockLabel::start()
+{
+  this->resume();
+}
+
+void AOClockLabel::start(QTime p_time)
+{
+  QTime time = QTime::currentTime();
+  if (p_time > time)
+  {
+    target_time = p_time;
+    starting_time = time;
+    timer.start(100, this);
+  }
+}
+
+void AOClockLabel::pause() {}
+
+void AOClockLabel::resume() {}
+
+void AOClockLabel::stop() {}
+
+void AOClockLabel::timerEvent(QTimerEvent *event)
+{
+    if (event->timerId() == timer.timerId()) {
+        QTime elapsed = QTime(0,0).addSecs(starting_time.secsTo(starting_time));
+        this->setText(elapsed.toString("hh:mm:ss.zzz"));
+    } else {
+        QWidget::timerEvent(event);
+    }
+}