composition.cpp

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// Copyright 2021 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 <memory>  // for allocator, shared_ptr, __shared_ptr_access
#include <string>  // for operator+, to_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 text, separator, Element, operator|, vbox, border
 
using namespace ftxui;
 
// 一個示範如何將多個元件組合成一個並維持其
// 互動性的範例。
int main() {
  auto left_count = 0;
  auto right_count = 0;
 
  auto left_buttons = Container::Horizontal({
      Button("Decrease", [&] { left_count--; }),
      Button("Increase", [&] { left_count++; }),
  });
 
  auto right_buttons = Container::Horizontal({
      Button("Decrease", [&] { right_count--; }),
      Button("Increase", [&] { right_count++; }),
  });
 
  // Renderer 使用新的渲染函數裝飾其子元件。子元件對事件的反應方式保持不變。
  auto leftpane = Renderer(left_buttons, [&] {
    return vbox({
               text("This is the left control"),
               separator(),
               text("Left button count: " + std::to_string(left_count)),
               left_buttons->Render(),
           }) |
           border;
  });
 
  auto rightpane = Renderer(right_buttons, [&] {
    return vbox({
               text("This is the right control"),
               separator(),
               text("Right button count: " + std::to_string(right_count)),
               right_buttons->Render(),
           }) |
           border;
  });
 
  // Container 將元件組合在一起。要渲染一個 Container::Horizontal，
  // 它會將其子元件並排渲染。它維持了它們的互動性，並
  // 提供使用方向鍵在它們之間導覽的邏輯。
  auto composition = Container::Horizontal({leftpane, rightpane});
 
  auto screen = App::FitComponent();
  screen.Loop(composition);
  return 0;
}
 
// 感謝 Chris Morgan 提供此範例！