How to create custom widgets

TUI++ exposes IRenderable, an interface that you can use for creating widgets.

#include <tuipp/widgets/IRenderable.hpp>
#include <tuipp/Console.hpp>
#include <tuipp/colors.hpp>

class MyWidget : public tuipp::widgets::IRenderable
{
  public:
    std::string content{};

    MyWidget(std::string content) : content(content) {}

    // you need to provide an implementation for render
    virtual void render(const int& width) const {
      std::cout << tuipp::colors::red << this->content
                << tuipp::colors::reset << std::endl;
    }

    // you need to implement this method because widgets like panel
    // are gonna call it before rendering for calculating the layout
    virtual int get_lenght(const int& width = 0) const {
      return this->content.lenght();
    }
};

int main() {
  auto widget = MyWidget("hello!");

  // Console::println automatically calls render()
  tuipp::Console::println(widget);

  return 0;
}

Output: hello!