add 'select' element (WIP)

src/graphics/ui/elements/SelectBox.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "Button.hpp"
+
+namespace gui {
+    class Label;
+
+    class SelectBox : public Button {
+    public:
+        struct Element {
+            std::string value;
+            std::wstring text;
+        };
+    private:
+        std::vector<Element> elements;
+        Element selected {};
+    public:
+        SelectBox(
+            GUI& gui,
+            std::vector<Element>&& elements,
+            Element selected,
+            int contentWidth,
+            const glm::vec4& padding
+        );
+    };
+}