minor refactor

src/graphics/ui/elements/UINode.cpp

@@ -132,6 +132,16 @@ void UINode::scrolled(int value) {
     }
 }
 
+glm::vec4 UINode::calcColor() const {
+    glm::vec4 color = this->color;
+    if (isEnabled()) {
+        color = (isPressed() ? pressedColor : (hover ? hoverColor : color));
+    } else {
+        color = glm::vec4(color.r, color.g, color.b, color.a * 0.5f);
+    }
+    return color;
+}
+
 void UINode::setPos(glm::vec2 pos) {
     this->pos = pos;
 }