feat: Support mouse scroll. (#201)

examples/component/menu_in_frame.cpp

@@ -0,0 +1,32 @@
+#include <memory>  // for shared_ptr, __shared_ptr_access
+#include <string>  // for string, basic_string, operator+, to_string
+#include <vector>  // for vector
+
+#include "ftxui/component/captured_mouse.hpp"      // for ftxui
+#include "ftxui/component/component.hpp"           // for Radiobox, Renderer
+#include "ftxui/component/component_base.hpp"      // for ComponentBase
+#include "ftxui/component/screen_interactive.hpp"  // for ScreenInteractive
+#include "ftxui/dom/elements.hpp"  // for operator|, Element, size, border, frame, HEIGHT, LESS_THAN
+
+using namespace ftxui;
+
+int main(int argc, const char* argv[]) {
+  std::vector<std::string> entries;
+  int selected = 0;
+
+  for (int i = 0; i < 30; ++i)
+    entries.push_back("Entry " + std::to_string(i));
+  auto radiobox = Menu(&entries, &selected);
+  auto renderer = Renderer(radiobox, [&] {
+    return radiobox->Render() | frame | size(HEIGHT, LESS_THAN, 10) | border;
+  });
+
+  auto screen = ScreenInteractive::FitComponent();
+  screen.Loop(renderer);
+
+  return 0;
+}
+
+// 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.