examples/component/linear_gradient_gallery.cpp

maybe

// 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.
#include <string>  // for string, allocator, basic_string
#include <vector>  // for vector
 
#include "ftxui/component/captured_mouse.hpp"  // for ftxui
#include "ftxui/component/component.hpp"  // for operator|, Maybe, Checkbox, Radiobox, Renderer, Vertical
#include "ftxui/component/component_base.hpp"      // for Component
#include "ftxui/component/screen_interactive.hpp"  // for ScreenInteractive
#include "ftxui/dom/elements.hpp"  // for Element, border, color, operator|, text
#include "ftxui/screen/color.hpp"  // for Color, Color::Red
 
using namespace ftxui;
 
int main() {
  std::vector<std::string> entries = {
      "entry 1",
      "entry 2",
      "entry 3",
  };
  int menu_1_selected = 0;
  int menu_2_selected = 0;
 
  bool menu_1_show = false;
  bool menu_2_show = false;
 
  auto layout = Container::Vertical({
      Checkbox("Show menu_1", &menu_1_show),
      Radiobox(&entries, &menu_1_selected) | border | Maybe(&menu_1_show),
      Checkbox("Show menu_2", &menu_2_show),
      Radiobox(&entries, &menu_2_selected) | border | Maybe(&menu_2_show),
 
      Renderer([] {
        return text("You found the secret combinaison!") | color(Color::Red);
      }) | Maybe([&] { return menu_1_selected == 1 && menu_2_selected == 2; }),
  });
 
  auto screen = ScreenInteractive::TerminalOutput();
  screen.Loop(layout);
}

// Copyright 2023 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 <ftxui/component/component_base.hpp>  // for ComponentBase, Component
#include <ftxui/dom/elements.hpp>  // for operator|, Element, flex, bgcolor, text, vbox, center
#include <ftxui/dom/linear_gradient.hpp>  // for LinearGradient
#include <ftxui/screen/color.hpp>         // for Color, Color::Blue, Color::Red
#include <memory>                         // for __shared_ptr_access, shared_ptr
#include <string>  // for allocator, operator+, char_traits, string, to_string
 
#include "ftxui/component/captured_mouse.hpp"  // for ftxui
#include "ftxui/component/component.hpp"       // for Slider, Renderer, Vertical
#include "ftxui/component/screen_interactive.hpp"  // for ScreenInteractive
 
int main() {
  using namespace ftxui;
  auto screen = ScreenInteractive::Fullscreen();
 
  int angle = 180.f;
  float start = 0.f;
  float end = 1.f;
 
  std::string slider_angle_text;
  std::string slider_start_text;
  std::string slider_end_text;
 
  auto slider_angle = Slider(&slider_angle_text, &angle, 0, 360);
  auto slider_start = Slider(&slider_start_text, &start, 0.f, 1.f, 0.05f);
  auto slider_end = Slider(&slider_end_text, &end, 0.f, 1.f, 0.05f);
 
  auto layout = Container::Vertical({
      slider_angle,
      slider_start,
      slider_end,
  });
 
  auto renderer = Renderer(layout, [&] {
    slider_angle_text = "angle = " + std::to_string(angle) + "°";
    slider_start_text = "start = " + std::to_string(int(start * 100)) + "%";
    slider_end_text = "end   = " + std::to_string(int(end * 100)) + "%";
 
    auto background = text("Gradient") | center |
                      bgcolor(LinearGradient()
                                  .Angle(angle)
                                  .Stop(Color::Blue, start)
                                  .Stop(Color::Red, end));
    return vbox({
               background | flex,
               layout->Render(),
           }) |
           flex;
  });
 
  screen.Loop(renderer);
}