From 86bb0e4239215eeb0f809516981f3d888b90fa9c Mon Sep 17 00:00:00 2001
From: Nomango <nomango@qq.com>
Date: Wed, 20 May 2020 00:55:51 +0800
Subject: [PATCH] use application scoped timer

---
 src/kiwano/platform/Application.cpp      | 10 ++++------
 src/kiwano/platform/Application.h        | 25 ++++++++++++------------
 src/kiwano/platform/win32/WindowImpl.cpp | 14 ++++++++++++-
 3 files changed, 30 insertions(+), 19 deletions(-)

diff --git a/src/kiwano/platform/Application.cpp b/src/kiwano/platform/Application.cpp
index 3c17a16f..5222fe11 100644
--- a/src/kiwano/platform/Application.cpp
+++ b/src/kiwano/platform/Application.cpp
@@ -68,15 +68,13 @@ void Application::Run(RunnerPtr runner, bool debug)
     // Everything is ready
     runner->OnReady();
 
-    running_          = true;
-    last_update_time_ = Time::Now();
+    running_ = true;
+    timer_   = Timer::Create();
     while (running_)
     {
-        const Time     now = Time::Now();
-        const Duration dt  = (now - last_update_time_);
-        last_update_time_  = now;
+        timer_->Tick();
 
-        if (!runner->MainLoop(dt))
+        if (!runner->MainLoop(timer_->GetDeltaTime()))
             running_ = false;
     }
 
diff --git a/src/kiwano/platform/Application.h b/src/kiwano/platform/Application.h
index e64d3e5a..6fe77c3c 100644
--- a/src/kiwano/platform/Application.h
+++ b/src/kiwano/platform/Application.h
@@ -23,6 +23,7 @@
 #include <kiwano/core/Common.h>
 #include <kiwano/core/Module.h>
 #include <kiwano/core/Time.h>
+#include <kiwano/core/Timer.h>
 #include <kiwano/core/Singleton.h>
 #include <kiwano/core/event/Event.h>
 #include <kiwano/platform/Runner.h>
@@ -77,6 +78,12 @@ public:
      */
     WindowPtr GetMainWindow() const;
 
+    /**
+     * \~chinese
+     * @brief 获取计时器
+     */
+    TimerPtr GetTimer() const;
+
     /**
      * \~chinese
      * @brief 是否正在运行
@@ -142,17 +149,11 @@ public:
      */
     void Destroy();
 
-    /**
-     * \~chinese
-     * @brief 获取上一次更新时间
-     */
-    Time GetLastUpdateTime() const;
-
 private:
     bool                    running_;
     float                   time_scale_;
     RunnerPtr               runner_;
-    Time                    last_update_time_;
+    TimerPtr                timer_;
     List<Module*>           modules_;
     std::mutex              perform_mutex_;
     Queue<Function<void()>> functions_to_perform_;
@@ -169,14 +170,14 @@ inline WindowPtr Application::GetMainWindow() const
     return runner_->GetMainWindow();
 }
 
+inline TimerPtr Application::GetTimer() const
+{
+    return timer_;
+}
+
 inline bool Application::IsRunning() const
 {
     return running_;
 }
 
-inline Time Application::GetLastUpdateTime() const
-{
-    return last_update_time_;
-}
-
 }  // namespace kiwano
diff --git a/src/kiwano/platform/win32/WindowImpl.cpp b/src/kiwano/platform/win32/WindowImpl.cpp
index 3c8f5322..38da0b70 100644
--- a/src/kiwano/platform/win32/WindowImpl.cpp
+++ b/src/kiwano/platform/win32/WindowImpl.cpp
@@ -502,9 +502,21 @@ LRESULT WindowWin32Impl::MessageProc(HWND hwnd, UINT32 msg, WPARAM wparam, LPARA
 
     case WM_ACTIVATE:
     {
+        bool active = (LOWORD(wparam) != WA_INACTIVE);
+
         WindowFocusChangedEventPtr evt = new WindowFocusChangedEvent;
-        evt->focus                     = (LOWORD(wparam) != WA_INACTIVE);
+        evt->focus                     = active;
         this->PushEvent(evt);
+
+        // Pause game when window is inactive
+        TimerPtr timer = Application::GetInstance().GetTimer();
+        if (timer)
+        {
+            if (active)
+                timer->Resume();
+            else
+                timer->Pause();
+        }
     }
     break;