Added animations to file selector

src/GUIStuff/GUIFloatAnimation.cpp

@@ -0,0 +1,68 @@
+#include "GUIFloatAnimation.hpp"
+#include "GUIManager.hpp"
+
+namespace GUIStuff {
+
+GUIFloatAnimation::GUIFloatAnimation(const GUIFloatAnimationData& animData):
+    anim(animData),
+    animVal(animData.startVal)
+{}
+
+bool GUIFloatAnimation::is_at_start() {
+    return state == State::DONE && currentTime == 0.0f;
+}
+
+bool GUIFloatAnimation::is_at_end() {
+    return state == State::DONE && currentTime == anim.duration;
+}
+
+bool GUIFloatAnimation::is_done() {
+    return state == State::DONE;
+}
+
+void GUIFloatAnimation::calculate_anim_val() {
+    animVal = std::lerp(anim.startVal, anim.endVal, anim.easing(currentTime / anim.duration));
+}
+
+void GUIFloatAnimation::update(GUIManager& gui) {
+    switch(state) {
+        case State::RUN: {
+            currentTime += gui.io.deltaTime;
+            if(currentTime >= anim.duration) {
+                currentTime = anim.duration;
+                state = State::DONE;
+            }
+            calculate_anim_val();
+            gui.set_to_layout();
+            break;
+        }
+        case State::RUN_REVERSE: {
+            currentTime -= gui.io.deltaTime;
+            if(currentTime <= 0.0f) {
+                currentTime = 0.0f;
+                state = State::DONE;
+            }
+            calculate_anim_val();
+            gui.set_to_layout();
+            break;
+        }
+        case State::DONE:
+            break;
+    }
+}
+
+float GUIFloatAnimation::get_val() const {
+    return animVal;
+}
+
+void GUIFloatAnimation::animation_trigger() {
+    if(currentTime < anim.duration)
+        state = State::RUN;
+}
+
+void GUIFloatAnimation::animation_trigger_reverse() {
+    if(currentTime > 0.0f)
+        state = State::RUN_REVERSE;
+}
+
+}