with_restored_io.cpp

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// Copyright 2022 Arthur Sonzogni. All rights reserved.
// Use of this source code is governed by the MIT license that can be found in
// the LICENSE file.
#include <cstdlib>   // for system, EXIT_SUCCESS
#include <iostream>  // for operator<<, basic_ostream, basic_ostream::operator<<, cout, endl, flush, ostream, basic_ostream<>::__ostream_type, cin
#include <memory>    // for shared_ptr, __shared_ptr_access, allocator
#include <string>    // for getline, string
 
#include "ftxui/component/app.hpp"             // for App
#include "ftxui/component/captured_mouse.hpp"  // for ftxui
#include "ftxui/component/component.hpp"  // for Button, Horizontal, Renderer
#include "ftxui/component/component_base.hpp"  // for ComponentBase
#include "ftxui/dom/elements.hpp"  // for operator|, filler, Element, borderEmpty, hbox, size, paragraph, vbox, LESS_THAN, border, center, HEIGHT, WIDTH
 
int main() {
  using namespace ftxui;
 
  auto screen = App::Fullscreen();
 
  // 當按下此按鈕時，"screen.WithRestoredIO" 將暫時卸載終端鉤子並執行所提供的回調函數。
  // 這允許應用程式以非互動模式運行。
  auto btn_run = Button("Execute with restored IO", screen.WithRestoredIO([] {
    std::cout << "This is a child program using stdin/stdout." << std::endl;
    for (int i = 0; i < 10; ++i) {
      std::cout << "Please enter 10 strings (" << i << "/10)" << std::flush;
      std::string input;
      std::getline(std::cin, input);
    }
  }));
 
  auto btn_quit = Button("Quit", screen.ExitLoopClosure());
 
  auto layout = Container::Horizontal({
      btn_run,
      btn_quit,
  });
 
  auto renderer = Renderer(layout, [&] {
    auto explanation = paragraph(
        "After clicking this button, the App will be "
        "suspended and access to stdin/stdout will temporarily be "
        "restore for running a function.");
    auto element = vbox({
        explanation | borderEmpty,
        hbox({
            btn_run->Render(),
            filler(),
            btn_quit->Render(),
        }),
    });
 
    element = element | borderEmpty | border | size(WIDTH, LESS_THAN, 80) |
              size(HEIGHT, LESS_THAN, 20) | center;
    return element;
  });
 
  screen.Loop(renderer);
  return EXIT_SUCCESS;
}