it is done

core/src/mindustry/ui/MultiReqImage.java

@@ -0,0 +1,33 @@
+package mindustry.ui;
+
+import arc.struct.Array;
+import arc.scene.ui.layout.Stack;
+import arc.util.Time;
+
+public class MultiReqImage extends Stack{
+    private Array<ReqImage> displays = new Array<>();
+    private float time;
+
+    public void add(ReqImage display){
+        displays.add(display);
+        super.add(display);
+    }
+
+    @Override
+    public void act(float delta){
+        super.act(delta);
+
+        time += Time.delta() / 60f;
+
+        displays.each(req -> req.visible(false));
+
+        ReqImage valid = displays.find(ReqImage::valid);
+        if(valid != null){
+            valid.visible(true);
+        }else{
+            if(displays.size > 0){
+                displays.get((int)(time) % displays.size).visible(true);
+            }
+        }
+    }
+}