SwitchView, to alternate between different views

src/ui/web/SwitchView.js

@@ -0,0 +1,36 @@
+export default class SwitchView {
+    constructor(defaultView) {
+        this._childView = defaultView;
+    }
+
+    mount() {
+        return this._childView.mount();
+    }
+
+    unmount() {
+        return this._childView.unmount();
+    }
+
+    root() {
+        return this._childView.root();
+    }
+
+    update() {
+        return this._childView.update();
+    }
+
+    switch(newView) {
+        const oldRoot = this.root();
+        this._childView.unmount();
+        this._childView = newView;
+        const newRoot = this._childView.mount();
+        const parent = oldRoot.parentElement;
+        if (parent) {
+            parent.replaceChild(newRoot, oldRoot);
+        }
+    }
+
+    get childView() {
+        return this._childView;
+    }
+}