More refactoring, stabilizing rotation and direction_gradient

UI/Base/FeatureSwitched.ts

@@ -0,0 +1,22 @@
+import {UIElement} from "../UIElement";
+import {UIEventSource} from "../../Logic/UIEventSource";
+
+export default class FeatureSwitched extends UIElement{
+    private readonly _upstream: UIElement;
+    private readonly _swtch: UIEventSource<boolean>;
+    
+    constructor(upstream :UIElement,
+                swtch: UIEventSource<boolean>) {
+        super(swtch);
+        this._upstream = upstream;
+        this._swtch = swtch;
+    }
+    
+    InnerRender(): string {
+        if(this._swtch.data){
+            return this._upstream.Render();
+        }
+        return "";
+    }
+    
+}