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#
# Level of abstractions:
* Level 0: terminal output.
* Level 1: ftxui::Screen
* Level 2: ftxui::Node
* Level 3: ftxui::Component
## Level 0: terminal output.
The terminal you know, you can append text on it. It is represented by
std::cout.
This is std::cout. You can send text to it.
## Level 1: ftxui::Screen
A rectangular grid of characters.
Use Terminal::ToString() to append its content into the console.
Use Terminal::ToString() to append its content to the console (level 0).
## Level 2: ftxui::Node
A hierarchical set of element.
They handle layout and Render themself on the screen.
A hierarchial set of element.
They handle layout and render themself on the screen (level 1)
See ftxui/dom/elements.hpp
You can make implement your own.
## Level 3: ftxui::Component
A hierarchical set of component. A component render itself by producing
ftxui::Node in Component::Render().
Some component can handle events:
A hierarchical set of components.
Components store some state and react to events:
* keyboard
* mouse
* terminal event
Components renders themself by producing ftxui::Node (Level 2)
Implement your own!