Add ITimer class

Author: adazem009

CMakeLists.txt

@@ -46,6 +46,7 @@ target_sources(scratchcpp
     include/scratchcpp/target.h
     include/scratchcpp/stage.h
     include/scratchcpp/sprite.h
+    include/scratchcpp/itimer.h
 )
 
 add_library(zip SHARED

include/scratchcpp/itimer.h

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+namespace libscratchcpp
+{
+
+class ITimer
+{
+    public:
+        virtual ~ITimer() { }
+
+        virtual double value() const = 0;
+
+        virtual void reset() = 0;
+};
+
+} // namespace libscratchcpp

src/engine/CMakeLists.txt

@@ -11,6 +11,8 @@ target_sources(scratchcpp
     script_p.h
     internal/engine.cpp
     internal/engine.h
+    internal/timer.cpp
+    internal/timer.h
     internal/blocksectioncontainer.cpp
     internal/blocksectioncontainer.h
     internal/global.h

src/engine/internal/timer.cpp

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: Apache-2.0
+
+#include "timer.h"
+
+using namespace libscratchcpp;
+
+Timer::Timer()
+{
+}
+
+double Timer::value() const
+{
+    return (std::chrono::steady_clock::now() - m_startTime).count() / 1000.0;
+}
+
+void Timer::reset()
+{
+    m_startTime = std::chrono::steady_clock::now();
+}

src/engine/internal/timer.h

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include <scratchcpp/itimer.h>
+#include <chrono>
+
+namespace libscratchcpp
+{
+
+class Timer : public ITimer
+{
+    public:
+        Timer();
+        Timer(const Timer &) = delete;
+
+        double value() const override;
+        void reset() override;
+
+    private:
+        std::chrono::steady_clock::time_point m_startTime = std::chrono::steady_clock::now();
+};
+
+} // namespace libscratchcpp