Add CheckBox.

examples/component/tab_vertical.cpp

@@ -0,0 +1,66 @@
+#include <iostream>
+#include <thread>
+
+#include "ftxui/component/container.hpp"
+#include "ftxui/component/menu.hpp"
+#include "ftxui/component/screen_interactive.hpp"
+#include "ftxui/component/toggle.hpp"
+#include "ftxui/screen/string.hpp"
+
+using namespace ftxui;
+
+class MyComponent : public Component {
+  public:
+   MyComponent() {
+     Add(&container_);
+     container_.Add(&menu_);
+
+     menu_.entries = {
+       L"menu_1",
+       L"menu_2",
+       L"menu_3",
+     };
+
+     container_.Add(&tab_container_);
+    
+     menu_1_.entries = {
+       L"Forest",
+       L"Water",
+       L"I don't know"
+     };
+     tab_container_.Add(&menu_1_);
+
+     menu_2_.entries = {
+       L"Hello",
+       L"Hi",
+       L"Hay",
+     };
+     tab_container_.Add(&menu_2_);
+
+     menu_3_.entries = {
+       L"Table",
+       L"Nothing",
+       L"Is",
+       L"Empty",
+     };
+     tab_container_.Add(&menu_3_);
+   }
+
+   std::function<void()> on_enter = [](){};
+  private:
+   Menu menu_;
+   Container container_ = Container::Horizontal();
+   Container tab_container_ = Container::Tab(&(menu_.selected));
+   Menu menu_1_;
+   Menu menu_2_;
+   Menu menu_3_;
+};
+
+ 
+int main(int argc, const char *argv[])
+{
+  auto screen = ScreenInteractive::TerminalOutput();
+  MyComponent component;
+  component.on_enter = screen.ExitLoopClosure();
+  screen.Loop(&component);
+}