Added animations to file selector

src/GUIStuff/GUIFloatAnimation.hpp

@@ -0,0 +1,40 @@
+#pragma once
+#include <Helpers/BezierEasing.hpp>
+
+namespace GUIStuff {
+
+class GUIManager;
+
+struct GUIFloatAnimationData {
+    float startVal = 0.0f;
+    float endVal = 1.0f;
+    float duration = 1.0f;
+    BezierEasing easing = BezierEasing::linear;
+};
+
+class GUIFloatAnimation {
+    public:
+        GUIFloatAnimation(const GUIFloatAnimationData& animData);
+        void update(GUIManager& gui);
+        void animation_trigger();
+        void animation_trigger_reverse();
+        float get_val() const;
+
+        bool is_at_start();
+        bool is_at_end();
+        bool is_done();
+
+        bool isUsedThisFrame;
+    private:
+        void calculate_anim_val();
+        enum class State {
+            RUN,
+            RUN_REVERSE,
+            DONE
+        } state = State::DONE;
+        float currentTime = 0.0f;
+        GUIFloatAnimationData anim;
+        float animVal;
+};
+
+}