FTXUI基础笔记（botton按钮组件基础）

先看原版示例程序吧：

#include <memory>  // for shared_ptr, __shared_ptr_access
#include <string>  // for operator+, to_string

#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/component/screen_interactive.hpp"  // for ScreenInteractive
#include "ftxui/dom/elements.hpp"  // for separator, gauge, text, Element, operator|, vbox, border

using namespace ftxui;

int main(int argc, const char* argv[]) {
  int value = 50;

  // The tree of components. This defines how to navigate using the keyboard.
  auto buttons = Container::Horizontal({
      Button("计数加1", [&] { value--; }),
      Button("计数减1", [&] { value++; }),
  });

  // Modify the way to render them on screen:
  auto component = Renderer(buttons, [&] {
    return vbox({
               text(" 数值 = " + std::to_string(value)),
               separator(),
               gauge(value * 0.01f),
               separator(),
               buttons->Render(),
           }) |
           border;
  });

  auto screen = ScreenInteractive::FitComponent();
  screen.Loop(component);
  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.

默认数值为50。点击按键实现加减1功能。

简要解释一下：

头文件部分

#include <memory>  // for shared_ptr, __shared_ptr_access
#include <string>  // for operator+, to_string

#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/component/screen_interactive.hpp"  // for ScreenInteractive
#include "ftxui/dom/elements.hpp"  // for separator, gauge, text, Element, operator|, vbox, border

按钮属性，包括点击后功能

  // The tree of components. This defines how to navigate using the keyboard.
  auto buttons = Container::Horizontal({
      Button("计数加1", [&] { value--; }),
      Button("计数减1", [&] { value++; }),
  });

整体在终端的显示：

  // Modify the way to render them on screen:
  auto component = Renderer(buttons, [&] {
    return vbox({
               text(" 数值 = " + std::to_string(value)),
               separator(),
               gauge(value * 0.01f),
               separator(),
               buttons->Render(),
           }) |
           border;
  });

程序bug，加减写反了：

自行修订即可。 

这个功能太简陋了，原版复杂一些的示例如下：

#include <memory>  // for shared_ptr, __shared_ptr_access
#include <string>  // for operator+, to_string

#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/component/component_options.hpp"   // for ButtonOption
#include "ftxui/component/screen_interactive.hpp"  // for ScreenInteractive
#include "ftxui/dom/elements.hpp"  // for gauge, separator, text, vbox, operator|, Element, border
#include "ftxui/screen/color.hpp"  // for Color, Color::Blue, Color::Green, Color::Red

using namespace ftxui;

int main(int argc, const char* argv[]) {
  int value = 50;

  // The tree of components. This defines how to navigate using the keyboard.
  auto buttons = Container::Horizontal({
      Button(
          "计数减一", [&] { value--; }, ButtonOption::Animated(Color::Red)),
      Button(
          "复位（默认50）", [&] { value = 50; }, ButtonOption::Animated(Color::Green)),
      Button(
          "计数加一", [&] { value++; }, ButtonOption::Animated(Color::Blue)),
  });

  // Modify the way to render them on screen:
  auto component = Renderer(buttons, [&] {
    return vbox({
        vbox({
            text(" 数值 = " + std::to_string(value)),
            separator(),
            gauge(value * 0.01f),
        }) | border,
        buttons->Render(),
    });
  });

  auto screen = ScreenInteractive::FitComponent();
  screen.Loop(component);
  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.

减

复位

加

看起来效果好一些。

改变之处：

  // The tree of components. This defines how to navigate using the keyboard.
  auto buttons = Container::Horizontal({
      Button(
          "计数减一", [&] { value--; }, ButtonOption::Animated(Color::Red)),
      Button(
          "复位（默认50）", [&] { value = 50; }, ButtonOption::Animated(Color::Green)),
      Button(
          "计数加一", [&] { value++; }, ButtonOption::Animated(Color::Blue)),
  });

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