Start on file chooser, page stack

src/gui/PageStack.cpp

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+#include "../../include/gui/PageStack.hpp"
+
+namespace gsr {
+    PageStack::PageStack() {}
+    
+    bool PageStack::on_event(mgl::Event &event, mgl::Window &window, mgl::vec2f offset) {
+        if(!visible)
+            return true;
+
+        offset = position + offset;
+        std::unique_ptr<Page> *top_page = widget_stack.back();
+        if(top_page) {
+            if(!(*top_page)->on_event(event, window, offset))
+                return false;
+        }
+
+        return true;
+    }
+
+    void PageStack::draw(mgl::Window &window, mgl::vec2f offset) {
+        if(!visible)
+            return;
+
+        offset = position + offset;
+        std::unique_ptr<Page> *top_page = widget_stack.back();
+        if(top_page)
+            (*top_page)->draw(window, offset);
+    }
+
+    mgl::vec2f PageStack::get_size() {
+        return {0.0f, 0.0f};
+    }
+
+    void PageStack::push(std::unique_ptr<Page> widget) {
+        widget->on_navigate_to_page();
+        widget_stack.push_back(std::move(widget));
+    }
+
+    void PageStack::pop() {
+        std::unique_ptr<Page> *top_page = widget_stack.back();
+        if(top_page) {
+            (*top_page)->on_navigate_away_from_page();
+            widget_stack.pop_back();
+        }
+    }
+
+    Page* PageStack::top() {
+        std::unique_ptr<Page> *top_page = widget_stack.back();
+        if(top_page)
+            return top_page->get();
+        else
+            return nullptr;
+    }
+
+    bool PageStack::empty() const {
+        return widget_stack.empty();
+    }
+}