examples/component/menu_entries.cpp

// 版权所有 2020 Arthur Sonzogni. 保留所有权利。
// 此源代码的使用受 MIT 许可证的约束，该许可证可在
// LICENSE 文件中找到。
#include <functional>  // for function
#include <iostream>  // for basic_ostream::operator<<, operator<<, endl, basic_ostream, basic_ostream<>::__ostream_type, cout, ostream
#include <memory>    // for allocator, shared_ptr, __shared_ptr_access
#include <string>  // for char_traits, to_string, operator+, string, basic_string
 
#include "ftxui/component/captured_mouse.hpp"  // for ftxui
#include "ftxui/component/component.hpp"  // for MenuEntry, Renderer, Vertical
#include "ftxui/component/component_base.hpp"      // for ComponentBase
#include "ftxui/component/component_options.hpp"   // for MenuEntryOption
#include "ftxui/component/screen_interactive.hpp"  // for ScreenInteractive
#include "ftxui/dom/elements.hpp"  // for operator|, Element, separator, text, hbox, size, frame, color, vbox, HEIGHT, LESS_THAN, bold, border, inverted
#include "ftxui/screen/color.hpp"  // for Color, Color::Blue, Color::Cyan, Color::Green, Color::Red, Color::Yellow
 
using namespace ftxui;
 
// 为某些菜单项定义特殊样式。
MenuEntryOption Colored(ftxui::Color c) {
  MenuEntryOption option;
  option.transform = [c](EntryState state) {
    state.label = (state.active ? "> " : "  ") + state.label;
    Element e = text(state.label) | color(c);
    if (state.focused) {
      e = e | inverted;
    }
    if (state.active) {
      e = e | bold;
    }
    return e;
  };
  return option;
}
 
int main() {
  auto screen = ScreenInteractive::TerminalOutput();
 
  int selected = 0;
  auto menu = Container::Vertical(
      {
          MenuEntry(" 1. improve"),
          MenuEntry(" 2. tolerant"),
          MenuEntry(" 3. career"),
          MenuEntry(" 4. cast"),
          MenuEntry(" 5. question"),
 
          Renderer([] { return separator(); }),
 
          MenuEntry(" 6. rear", Colored(Color::Red)),
          MenuEntry(" 7. drown", Colored(Color::Yellow)),
          MenuEntry(" 8. nail", Colored(Color::Green)),
          MenuEntry(" 9. quit", Colored(Color::Cyan)),
          MenuEntry("10. decorative", Colored(Color::Blue)),
 
          Renderer([] { return separator(); }),
 
          MenuEntry("11. costume"),
          MenuEntry("12. pick"),
          MenuEntry("13. oral"),
          MenuEntry("14. minister"),
          MenuEntry("15. football"),
          MenuEntry("16. welcome"),
          MenuEntry("17. copper"),
          MenuEntry("18. inhabitant"),
          MenuEntry("19. fortune"),
      },
      &selected);
 
  // 将菜单与边框一起显示
  auto renderer = Renderer(menu, [&] {
    return vbox({
               hbox(text("selected = "), text(std::to_string(selected))),
               separator(),
               menu->Render() | frame | size(HEIGHT, LESS_THAN, 10),
           }) |
           border;
  });
 
  screen.Loop(renderer);
 
  std::cout << "Selected element = " << selected << std::endl;
}