Add mouse implementation of most components.

src/ftxui/dom/reflect.cpp

@@ -0,0 +1,42 @@
+#include <memory>
+#include "ftxui/dom/elements.hpp"
+#include "ftxui/dom/node.hpp"
+#include "ftxui/dom/node_decorator.hpp"
+
+namespace ftxui {
+
+Box box;
+
+// Helper class.
+class Reflect : public Node {
+ public:
+  Reflect(Element child, Box& box)
+      : Node(unpack(std::move(child))), box_(box) {}
+  ~Reflect() override {}
+
+  void ComputeRequirement() final {
+    Node::ComputeRequirement();
+    requirement_ = children[0]->requirement();
+  }
+
+  void SetBox(Box box) final {
+    box_ = box;
+    Node::SetBox(box_);
+    children[0]->SetBox(box_);
+  }
+
+ private:
+  Box& box_;
+};
+
+Decorator reflect(Box& box) {
+  return [&](Element child) -> Element {
+    return std::make_shared<Reflect>(std::move(child), box);
+  };
+}
+
+}  // namespace ftxui
+
+// Copyright 2020 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.