FTXUI/tutorial.md

Table of content.

• DOM
  • Style
  • Layout
  • Widget.
    • text
    • frame
    • separator
    • gauge
• Components.
  • Input
  • Menu
  • Toggle.

DOM

All the dom element are declared in one header:

#include <ftxui/dom/elements.hpp>

It declares the following set of elements:

// --- Layout ----
Element vbox(Children);
Element hbox(Children);
Element dbox(Children);
Element filler();
Element flex(Element);

// --- Widget --
Element text(std::wstring text);
Element separator();
Element gauge(float ratio);
Element frame(Element);
Element window(Child title, Child content);

// -- Decorator ---
Element bold(Element);
Element dim(Element);
Element inverted(Element);
Element underlined(Element);
Element blink(Element);
Element color(Color, Element);
Element bgcolor(Color, Element);
Decorator color(Color);
Decorator bgcolor(Color);

// --- Util ---
Element hcenter(Element);
Element vcenter(Element);
Element center(Element);

// --- Util ---
Element nothing(Element element);

Style

A terminal console can usually display colored text and colored background. The text can also have different effects: bold, dim, underlined, inverted, blink.

Element bold(Element);
Element dim(Element);
Element inverted(Element);
Element underlined(Element);
Element blink(Element);
Element color(Color, Element);
Element bgcolor(Color, Element);

Layout

• vbox (Vertical-box)
• hbox (Horizontal-box)
• fbox (Depth-box) are containers. They are used to compose all the elements together. Each children are put side by side. If the container is flexible, the extra space available will be shared among the remaining flexible children.

flex(element) can be used to make a non-flexible element flexible. filler() is a flexible empty element. You can use it to children on one side of the container.

Examples

  hbox(
    frame(text(L"left")),
    flex(frame(text(L"middle"))),
    frame(text(L"right"))
  );

┌────┐┌─────────────────────────────────────────────────────────────────┐┌─────┐
│left││middle                                                           ││right│
└────┘└─────────────────────────────────────────────────────────────────┘└─────┘

  hbox(
    frame(text(L"left")),
    flex(frame(text(L"middle"))),
    flex(frame(text(L"right")))
  );

┌────┐┌───────────────────────────────────┐┌───────────────────────────────────┐
│left││middle                             ││right                              │
└────┘└───────────────────────────────────┘└───────────────────────────────────┘

Widget.

text

The most simple widget. It display a text.

  text(L"I am a piece of text");

I am a piece of text.

frame

Add a border arround an element

frame(text(L"The element"))

┌───────────┐
│The element│
└───────────┘

separator

Display a vertical or horizontal line to visually split the content of a container in two.

frame(hbox(
  vbox(
    text(L"left top"),
    text(L"left bottom")
  ),
  separator(),
  vbox(
    text(L"right top"),
    text(L"right bottom")
  )
));

┌───────────┬────────────┐
│left top   │right top   │
│left bottom│right bottom│
└───────────┴────────────┘

gauge

A gauge. It can be used to represent a progress bar.

frame(gauge(0.5))

┌────────────────────────────────────────────────────────────────────────────┐
│██████████████████████████████████████                                      │
└────────────────────────────────────────────────────────────────────────────┘

Decorator

Terminal supports displaying text using differet style: bold, dim, underlined, inverted, blink. It even support foreground and background color.

Example:

underlined(bold(text(L"This text is bold and underlined")))

Tips: The pipe operator can be used to chain Decorator:

text(L"This text is bold")) | bold | underlined

Components.

Input

TODO(arthursonzogni): Add Video

Menu

TODO(arthursonzogni): Add Video

Toggle.

TODO(arthursonzogni): Add video