Start on file chooser, page stack

include/gui/PageStack.hpp

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+#pragma once
+
+#include "Widget.hpp"
+#include "Page.hpp"
+#include "../SafeVector.hpp"
+#include <memory>
+
+namespace gsr {
+    class PageStack : public Widget {
+    public:
+        PageStack();
+        PageStack(const PageStack&) = delete;
+        PageStack& operator=(const PageStack&) = delete;
+
+        bool on_event(mgl::Event &event, mgl::Window &window, mgl::vec2f offset) override;
+        void draw(mgl::Window &window, mgl::vec2f offset) override;
+
+        mgl::vec2f get_size() override;
+
+        void push(std::unique_ptr<Page> page);
+        // This can be used even if the stack is empty
+        void pop();
+        // This can be used even if the stack is empty
+        Page* top();
+        bool empty() const;
+    private:
+        SafeVector<std::unique_ptr<Page>> widget_stack;
+    };
+}