From 1d559735ba59f48ca060226befadc2aee92b1fca Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Mon, 26 Dec 2022 17:15:05 +0100
Subject: Session now manages Scenes in via a stack

---
 kurator/src/Session.cpp | 35 ++++++++++++++++++++++++++---------
 kurator/src/Session.h   | 10 ++++++----
 2 files changed, 32 insertions(+), 13 deletions(-)

diff --git a/kurator/src/Session.cpp b/kurator/src/Session.cpp
index 1d1d513..9d39d59 100644
--- a/kurator/src/Session.cpp
+++ b/kurator/src/Session.cpp
@@ -1,6 +1,7 @@
 #include "Session.h"
 
 #include <memory>
+#include <utility>
 
 #include <raylib.h>
 #include <rlImGui.h>
@@ -13,27 +14,43 @@ namespace kurator
 
 
 void
-Session::set(std::shared_ptr<Scene> _scene)
+Session::set(std::shared_ptr<Scene> scene)
 {
-	previous_scene = scene;
-	scene = _scene;
+	pop();
+	push(std::move(scene));
+}
+
+
+void
+Session::push(std::shared_ptr<Scene> scene)
+{
+	scenes.push_back(std::move(scene));
+}
+
+
+void
+Session::pop()
+{
+	if (!scenes.empty()) {
+		for_removal.push_back(std::move(scenes.back()));
+		scenes.pop_back();
+	}
 }
 
 
 void
 Session::run()
 {
-	while (!window.should_close() && keep_going) {
-		if (!scene)
-			return;
+	while (!window.should_close() && !scenes.empty()) {
+		auto scene = scenes.back();
 		rlImGuiBegin();
 		scene->update(GetFrameTime());
 		BeginDrawing();
 		scene->draw();
 		rlImGuiEnd();
 		EndDrawing();
-		if (previous_scene)
-			previous_scene.reset();
+		if (!for_removal.empty())
+			for_removal.clear();
 	}
 }
 
@@ -41,7 +58,7 @@ Session::run()
 void
 Session::quit()
 {
-	keep_going = false;
+	scenes.clear();
 }
 
 
diff --git a/kurator/src/Session.h b/kurator/src/Session.h
index 59aa597..dfc49e0 100644
--- a/kurator/src/Session.h
+++ b/kurator/src/Session.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <deque>
 #include <memory>
 
 #include "Scene.h"
@@ -13,14 +14,15 @@ namespace kurator
 class Session
 {
 public:
-	void set(std::shared_ptr<Scene> _scene);
+	void set(std::shared_ptr<Scene> scene);
+	void push(std::shared_ptr<Scene> scene);
+	void pop();
 	void run();
 	void quit();
 private:
-	bool keep_going = true;
 	Window window;
-	std::shared_ptr<Scene> scene;
-	std::shared_ptr<Scene> previous_scene;
+	std::deque<std::shared_ptr<Scene>> scenes;
+	std::deque<std::shared_ptr<Scene>> for_removal;
 };
 
 
-- 
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