From e97812dcaf6f5a7202bc45d9431f7702f8218f6f Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Sun, 13 Sep 2020 11:11:58 +0300
Subject: [PATCH] Add on_scene_enter & on_scene_exit

---
 libs/app/include/psemek/app/scene.hpp | 3 +++
 libs/app/source/app.cpp               | 7 ++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/libs/app/include/psemek/app/scene.hpp b/libs/app/include/psemek/app/scene.hpp
index 889537d0..da50c18b 100644
--- a/libs/app/include/psemek/app/scene.hpp
+++ b/libs/app/include/psemek/app/scene.hpp
@@ -9,6 +9,9 @@ namespace psemek::app
 	{
 		virtual ~scene() = 0;
 
+		virtual void on_scene_enter() {}
+		virtual void on_scene_exit() {}
+
 		virtual void on_resize(int width, int height) {}
 		virtual void on_focus_gained() {}
 		virtual void on_focus_lost() {}
diff --git a/libs/app/source/app.cpp b/libs/app/source/app.cpp
index a3d92e50..51c65e23 100644
--- a/libs/app/source/app.cpp
+++ b/libs/app/source/app.cpp
@@ -198,6 +198,7 @@ namespace psemek::app
 	void app::run()
 	{
 		impl().running = true;
+		impl().get_scene()->on_scene_enter();
 		while (running())
 		{
 			poll_events();
@@ -221,9 +222,13 @@ namespace psemek::app
 
 	scene * app::set_scene(scene * s)
 	{
-		impl().had_initial_resize = false;
+		impl().get_scene()->on_scene_exit();
 
+		impl().had_initial_resize = false;
 		std::swap(s, impl().current_scene);
+
+		impl().get_scene()->on_scene_enter();
+
 		return s;
 	}