namespace ftxui {
    ...
 
// Define the document
Element document = vbox({
  text("The window") | bold | color(Color::Blue),
  gauge(0.5)
  text("The footer")
});
 
// Add a border, by calling the `ftxui::border` decorator function.
document = border(document);
 
// Add another border, using the pipe operator.
document = document | border.
 
// Add another border, using the |= operator.
document |= border
 
...
}

List of elements

The list of all elements are included and can be accessed by including the corresponding header file:

#include <ftxui/dom/elements.hpp>

elements.hpp

// 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.
#ifndef FTXUI_DOM_ELEMENTS_HPP
#define FTXUI_DOM_ELEMENTS_HPP
 
#include <functional>
#include <memory>
 
#include <string_view>
#include "ftxui/dom/canvas.hpp"
#include "ftxui/dom/direction.hpp"
#include "ftxui/dom/flexbox_config.hpp"
#include "ftxui/dom/linear_gradient.hpp"
#include "ftxui/dom/node.hpp"
#include "ftxui/screen/box.hpp"
#include "ftxui/screen/color.hpp"
#include "ftxui/screen/terminal.hpp"
#include "ftxui/util/export.hpp"
#include "ftxui/util/ref.hpp"
 
namespace ftxui {
class Node;
using Element = std::shared_ptr<Node>;
using Elements = std::vector<Element>;
using Decorator = std::function<Element(Element)>;
using GraphFunction = std::function<std::vector<int>(int, int)>;
 
/// @brief BorderStyle is an enumeration that represents the different styles
/// of borders that can be applied to elements in the terminal UI.
///
/// BorderStyle is an enumeration that represents the different styles of
/// borders that can be applied to elements in the terminal UI.
/// It is used to define the visual appearance of borders around elements,
/// such as windows, frames, or separators.
/// @ingroup dom
enum BorderStyle {
  LIGHT,
  DASHED,
  HEAVY,
  DOUBLE,
  ROUNDED,
  EMPTY,
};
 
// Pipe elements into decorator together.
// For instance the next lines are equivalents:
// -> text("ftxui") | bold | underlined
// -> underlined(bold(text("FTXUI")))
FTXUI_EXPORT(DOM) Element operator|(Element, Decorator);
FTXUI_EXPORT(DOM) Element& operator|=(Element&, Decorator);
FTXUI_EXPORT(DOM) Elements operator|(Elements, Decorator);
FTXUI_EXPORT(DOM) Decorator operator|(Decorator, Decorator);
 
// --- Widget ---
FTXUI_EXPORT(DOM) Element text(std::string_view text);
FTXUI_EXPORT(DOM) Element vtext(std::string_view text);
FTXUI_EXPORT(DOM) Element separator();
FTXUI_EXPORT(DOM) Element separatorLight();
FTXUI_EXPORT(DOM) Element separatorDashed();
FTXUI_EXPORT(DOM) Element separatorHeavy();
FTXUI_EXPORT(DOM) Element separatorDouble();
FTXUI_EXPORT(DOM) Element separatorEmpty();
FTXUI_EXPORT(DOM) Element separatorStyled(BorderStyle);
FTXUI_EXPORT(DOM) Element separator(Cell);
FTXUI_EXPORT(DOM) Element separatorCharacter(std::string_view);
FTXUI_EXPORT(DOM)
Element separatorHSelector(float left,
                           float right,
                           Color unselected_color,
                           Color selected_color);
FTXUI_EXPORT(DOM)
Element separatorVSelector(float up,
                           float down,
                           Color unselected_color,
                           Color selected_color);
FTXUI_EXPORT(DOM) Element gauge(float progress);
FTXUI_EXPORT(DOM) Element gaugeLeft(float progress);
FTXUI_EXPORT(DOM) Element gaugeRight(float progress);
FTXUI_EXPORT(DOM) Element gaugeUp(float progress);
FTXUI_EXPORT(DOM) Element gaugeDown(float progress);
FTXUI_EXPORT(DOM) Element gaugeDirection(float progress, Direction direction);
FTXUI_EXPORT(DOM) Element border(Element);
FTXUI_EXPORT(DOM) Element borderLight(Element);
FTXUI_EXPORT(DOM) Element borderDashed(Element);
FTXUI_EXPORT(DOM) Element borderHeavy(Element);
FTXUI_EXPORT(DOM) Element borderDouble(Element);
FTXUI_EXPORT(DOM) Element borderRounded(Element);
FTXUI_EXPORT(DOM) Element borderEmpty(Element);
FTXUI_EXPORT(DOM) Decorator borderStyled(BorderStyle);
FTXUI_EXPORT(DOM) Decorator borderStyled(BorderStyle, Color);
FTXUI_EXPORT(DOM) Decorator borderStyled(Color);
FTXUI_EXPORT(DOM) Decorator borderWith(const Cell&);
FTXUI_EXPORT(DOM)
Element window(Element title, Element content, BorderStyle border = ROUNDED);
FTXUI_EXPORT(DOM) Element spinner(int charset_index, size_t image_index);
FTXUI_EXPORT(DOM) Element paragraph(std::string_view text);
FTXUI_EXPORT(DOM) Element paragraphAlignLeft(std::string_view text);
FTXUI_EXPORT(DOM) Element paragraphAlignRight(std::string_view text);
FTXUI_EXPORT(DOM) Element paragraphAlignCenter(std::string_view text);
FTXUI_EXPORT(DOM) Element paragraphAlignJustify(std::string_view text);
FTXUI_EXPORT(DOM) Element graph(GraphFunction);
FTXUI_EXPORT(DOM) Element emptyElement();
FTXUI_EXPORT(DOM) Element canvas(ConstRef<Canvas>);
FTXUI_EXPORT(DOM)
Element canvas(int width, int height, std::function<void(Canvas&)>);
FTXUI_EXPORT(DOM) Element canvas(std::function<void(Canvas&)>);
 
// -- Decorator ---
FTXUI_EXPORT(DOM) Element bold(Element);
FTXUI_EXPORT(DOM) Element dim(Element);
FTXUI_EXPORT(DOM) Element italic(Element);
FTXUI_EXPORT(DOM) Element inverted(Element);
FTXUI_EXPORT(DOM) Element underlined(Element);
FTXUI_EXPORT(DOM) Element underlinedDouble(Element);
FTXUI_EXPORT(DOM) Element blink(Element);
FTXUI_EXPORT(DOM) Element strikethrough(Element);
FTXUI_EXPORT(DOM) Decorator color(Color);
FTXUI_EXPORT(DOM) Decorator bgcolor(Color);
FTXUI_EXPORT(DOM) Decorator color(const LinearGradient&);
FTXUI_EXPORT(DOM) Decorator bgcolor(const LinearGradient&);
FTXUI_EXPORT(DOM) Element color(Color, Element);
FTXUI_EXPORT(DOM) Element bgcolor(Color, Element);
FTXUI_EXPORT(DOM) Element color(const LinearGradient&, Element);
FTXUI_EXPORT(DOM) Element bgcolor(const LinearGradient&, Element);
FTXUI_EXPORT(DOM) Decorator focusPosition(int x, int y);
FTXUI_EXPORT(DOM) Decorator focusPositionRelative(float x, float y);
FTXUI_EXPORT(DOM) Element automerge(Element child);
FTXUI_EXPORT(DOM) Decorator hyperlink(std::string_view link);
FTXUI_EXPORT(DOM) Element hyperlink(std::string_view link, Element child);
FTXUI_EXPORT(DOM) Element selectionStyleReset(Element);
FTXUI_EXPORT(DOM) Decorator selectionColor(Color foreground);
FTXUI_EXPORT(DOM) Decorator selectionBackgroundColor(Color foreground);
FTXUI_EXPORT(DOM) Decorator selectionForegroundColor(Color foreground);
FTXUI_EXPORT(DOM) Decorator selectionStyle(std::function<void(Cell&)> style);
 
// --- Layout is
// Horizontal, Vertical or stacked set of elements.
FTXUI_EXPORT(DOM) Element hbox(Elements);
FTXUI_EXPORT(DOM) Element vbox(Elements);
FTXUI_EXPORT(DOM) Element dbox(Elements);
FTXUI_EXPORT(DOM)
Element flexbox(Elements, FlexboxConfig config = FlexboxConfig());
FTXUI_EXPORT(DOM) Element gridbox(std::vector<Elements> lines);
 
FTXUI_EXPORT(DOM)
Element hflow(Elements);  // Helper: default flexbox with row direction.
FTXUI_EXPORT(DOM)
Element vflow(Elements);  // Helper: default flexbox with column direction.
 
// -- Flexibility ---
// Define how to share the remaining space when not all of it is used inside a
// container.
FTXUI_EXPORT(DOM) Element flex(Element);  // Expand/Minimize if possible/needed.
FTXUI_EXPORT(DOM) Element flex_grow(Element);    // Expand element if possible.
FTXUI_EXPORT(DOM) Element flex_shrink(Element);  // Minimize element if needed.
 
FTXUI_EXPORT(DOM)
Element xflex(Element);  // Expand/Minimize if possible/needed on X axis.
FTXUI_EXPORT(DOM)
Element xflex_grow(Element);  // Expand element if possible on X axis.
FTXUI_EXPORT(DOM)
Element xflex_shrink(Element);  // Minimize element if needed on X axis.
 
FTXUI_EXPORT(DOM)
Element yflex(Element);  // Expand/Minimize if possible/needed on Y axis.
FTXUI_EXPORT(DOM)
Element yflex_grow(Element);  // Expand element if possible on Y axis.
FTXUI_EXPORT(DOM)
Element yflex_shrink(Element);  // Minimize element if needed on Y axis.
 
FTXUI_EXPORT(DOM) Element notflex(Element);  // Reset the flex attribute.
FTXUI_EXPORT(DOM) Element filler();          // A blank expandable element.
 
// -- Size override;
enum WidthOrHeight { WIDTH, HEIGHT };
enum Constraint { LESS_THAN, EQUAL, GREATER_THAN };
FTXUI_EXPORT(DOM) Decorator size(WidthOrHeight, Constraint, int value);
 
// --- Frame ---
// A frame is a scrollable area. The internal area is potentially larger than
// the external one. The internal area is scrolled in order to make visible the
// focused element.
FTXUI_EXPORT(DOM) Element frame(Element);
FTXUI_EXPORT(DOM) Element xframe(Element);
FTXUI_EXPORT(DOM) Element yframe(Element);
FTXUI_EXPORT(DOM) Element focus(Element);
FTXUI_EXPORT(DOM) Element select(Element e);  // Deprecated - Alias for focus.
 
// --- Cursor ---
// Those are similar to `focus`, but also change the shape of the cursor.
FTXUI_EXPORT(DOM) Element focusCursorBlock(Element);
FTXUI_EXPORT(DOM) Element focusCursorBlockBlinking(Element);
FTXUI_EXPORT(DOM) Element focusCursorBar(Element);
FTXUI_EXPORT(DOM) Element focusCursorBarBlinking(Element);
FTXUI_EXPORT(DOM) Element focusCursorUnderline(Element);
FTXUI_EXPORT(DOM) Element focusCursorUnderlineBlinking(Element);
 
// --- Misc ---
FTXUI_EXPORT(DOM) Element vscroll_indicator(Element);
FTXUI_EXPORT(DOM) Element hscroll_indicator(Element);
FTXUI_EXPORT(DOM) Decorator reflect(Box& box);
// Before drawing the |element| clear the pixel below. This is useful in
// combination with dbox.
FTXUI_EXPORT(DOM) Element clear_under(Element element);
 
// --- Util --------------------------------------------------------------------
FTXUI_EXPORT(DOM) Element hcenter(Element);
FTXUI_EXPORT(DOM) Element vcenter(Element);
FTXUI_EXPORT(DOM) Element center(Element);
FTXUI_EXPORT(DOM) Element align_right(Element);
FTXUI_EXPORT(DOM) Element nothing(Element element);
 
namespace Dimension {
FTXUI_EXPORT(DOM) Dimensions Fit(Element&, bool extend_beyond_screen = false);
}  // namespace Dimension
 
}  // namespace ftxui
 
// Make container able to take any number of children as input.
#include "ftxui/dom/take_any_args.hpp"
 
// Include old definitions using wstring.
#include "ftxui/dom/deprecated.hpp"
#endif  // FTXUI_DOM_ELEMENTS_HPP

text

The most simple widget. It displays a text.

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

I am a piece of text.

vtext

Identical to ftxui::text, but displayed vertically.

Code:

vtext("HELLO");

Terminal output:

H
E
L
L
O

paragraph

Similar to ftxui::text, but the individual word are wrapped along multiple lines, depending on the width of its container.

Sample Code:

paragraph("A very long text")

ezgif com-gif-maker (4)

For a more detailed example refer to detailed example. Paragraph also includes a number of other variants as shown below:

namespace ftxui {
    Element paragraph(std::string text);
    Element paragraphAlignLeft(std::string text);
    Element paragraphAlignRight(std::string text);
    Element paragraphAlignCenter(std::string text);
    Element paragraphAlignJustify(std::string text);
}

border

Adds a border around an element.

Code:

border(text("The element"))

Terminal output:

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

Note: You can achieve the same behavior by using the pipe operator.

Code:
text("The element") | border

Border also comes in a variety of styles as shown below:

namespace ftxui {
    Element border(Element);
    Element borderLight(Element);
    Element borderHeavy(Element);
    Element borderDouble(Element);
    Element borderRounded(Element);
    Element borderEmpty(Element);
    Decorator borderStyled(BorderStyle);
    Decorator borderWith(Cell);
}

window

A ftxui::window is a ftxui::border, but with an additional header. To add a window around an element, wrap it and specify a string as the header. Code:

window("The window", text("The element"))

Terminal output:

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

separator

Displays a vertical/horizontal line to visually split the content of a container in two.

Code:

border(
  hbox({
    text("Left"), 
    separator(),
    text("Right")
  })
)

Terminal output:

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

Separators come in a variety of flavors as shown below:

namespace ftxui {
    Element separator(void);
    Element separatorLight();
    Element separatorHeavy();
    Element separatorDouble();
    Element separatorEmpty();
    Element separatorStyled(BorderStyle);
    Element separator(Cell);
    Element separatorCharacter(std::string);
    Element separatorHSelector(float left,
                               float right,
                               Color background,
                               Color foreground);
    Element separatorVSelector(float up,
                               float down,
                               Color background,
                               Color foreground);
}

gauge

This is a visual element that represents a ratio of progress.

Code:

border(gauge(0.5))

Terminal output:

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

Gauges can be displayed in many orientations as shown below:

namespace {
    Element gauge(float ratio);
    Element gaugeLeft(float ratio);
    Element gaugeRight(float ratio);
    Element gaugeUp(float ratio);
    Element gaugeDown(float ratio);
    Element gaugeDirection(float ratio, GaugeDirection);
}

graph

See:

Element graph(GraphFunction);

Colors

Most terminal consoles can display colored text and colored backgrounds. FTXUI supports every color palette:

Decorator color(Color);

Decorator bgcolor(Color);

Color gallery:

Palette16

On most terminals the following colors are supported:

Default
Black
GrayDark
GrayLight
White
Blue
BlueLight
Cyan
CyanLight
Green
GreenLight
Magenta
MagentaLight
Red
RedLight
Yellow
YellowLight

Example use of the above colors using the pipe operator:

text("Blue foreground") | color(Color::Blue);
text("Blue background") | bgcolor(Color::Blue);
text("Black on white") | color(Color::Black) | bgcolor(Color::White);

Palette256

On terminal supporting 256 colors.

text("HotPink") | color(Color::HotPink);

TrueColor

On terminal supporting trueColor, you can directly use the 24bit RGB color space:

Use the constructors below to specify the RGB or HSV values for your color:

There are two constructors:

ftxui::Color::RGB(uint8_t red, uint8_t green, uint8_t blue);

ftxui::Color::HSV(uint8_t hue, uint8_t saturation, uint8_t value);

LinearGradient

FTXUI supports linear gradient. Either on the foreground or the background.

Decorator color(const LinearGradient&);

Decorator bgcolor(const LinearGradient&);

A ftxui::LinearGradient is defined by an angle in degree, and a list of color stops.

auto gradient = LinearGradient()
  .Angle(45)
  .AddStop(0.0, Color::Red)
  .AddStop(0.5, Color::Green)
  .AddStop(1.0, Color::Blue);

You can also use simplified constructors:

LinearGradient(Color::Red, Color::Blue);

LinearGradient(45, Color::Red, Color::Blue);

See demo.

Style

In addition to colored text and colored backgrounds. Many terminals support text effects such as: bold, italic, dim, underlined, inverted, blink.

Element bold(Element);
Element italic(Element);
Element dim(Element);
Element inverted(Element);
Element underlined(Element);
Element underlinedDouble(Element);
Element strikethrough(Element);
Element blink(Element);
Decorator color(Color);
Decorator bgcolor(Color);
Decorator colorgrad(LinearGradient);
Decorator bgcolorgrad(LinearGradient);

Example

To use these effects, simply wrap your elements with your desired effect:

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

Alternatively, use the pipe operator to chain it on your element:

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

Layout

Enables elements to be arranged in the following ways:

Horizontally with ftxui::hbox
Vertically with ftxui::vbox
Inside a grid with ftxui::gridbox
Wrapped along one direction using the ftxui::flexbox.

Example using ftxui::hbox, ftxui::vbox and ftxui::filler.

Example using ftxui::gridbox:

Example using flexbox:

Checkout this example and the associated demo.

Element can also become flexible using the ftxui::flex decorator.

Code:

hbox({
  text("left") | border ,
  text("middle") | border | flex,
  text("right") | border,
});

Terminal output:

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

Code:

hbox({
  text("left") | border ,
  text("middle") | border | flex,
  text("right") | border | flex,
});

Terminal output:

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

Table

Enables easy formatting of data into a neat table like visual form.

Basic example:

auto table = Table({
  {"Planet", "Radius", "Mass"},
  {"Mercury", "2440", "0.330"},
  {"Venus", "6052", "4.87"},
  {"Earth", "6371", "5.97"},
  {"Mars", "3390", "0.642"},
});
 
table.SelectAll().Border(LIGHT);
table.SelectRow(0).Decorate(bold);
table.SelectRow(0).SeparatorVertical(LIGHT);
table.SelectRow(0).Border(DOUBLE);
 
auto document = table.Render();

Code example:

Selection and Styling

You can select parts of the table and apply decorators or borders to them. Selection methods include:

ftxui::TableSelection::SelectAll();
ftxui::TableSelection::SelectCell(column, row);
ftxui::TableSelection::SelectRow(row_index);
ftxui::TableSelection::SelectRows(row_min, row_max);
ftxui::TableSelection::SelectColumn(column_index);
ftxui::TableSelection::SelectColumns(column_min, column_max);
ftxui::TableSelection::SelectRectangle(column_min, column_max, row_min, row_max);

Once a selection is made, you can apply:

ftxui::TableSelection::Decorate(Decorator); // Apply a decorator to the whole selection (cells and borders).
ftxui::TableSelection::DecorateCells(Decorator); // Apply a decorator only to the cells.
ftxui::TableSelection::Border(BorderStyle); // Add a border around the selection.
ftxui::TableSelection::Separator(BorderStyle); // 

Colored borders

You can also apply decorators specifically to borders and separators:

// Apply a red border to the whole table.
table.SelectAll().Border(LIGHT, color(Color::Red));
 
// Apply a blue separator to the first row.
table.SelectRow(0).SeparatorVertical(LIGHT, color(Color::Blue));

The following methods are available for fine-grained border decoration:

ftxui::TableSelection::DecorateBorder(Decorator); // Apply a decorator to all borders of the selection.
ftxui::TableSelection::DecorateBorderLeft(Decorator); // Apply a decorator to the left border of the selection.
ftxui::TableSelection::DecorateBorderRight(Decorator); // Apply a decorator to the right border of the selection.
ftxui::TableSelection::DecorateBorderTop(Decorator); // Apply a decorator to the top border of the selection.
ftxui::TableSelection::DecorateBorderBottom(Decorator); // Apply a decorator to the bottom border of the selection.
ftxui::TableSelection::DecorateSeparator(Decorator); // Apply a decorator to all separators of the selection.
ftxui::TableSelection::DecorateSeparatorVertical(Decorator); // Apply a decorator to all vertical separators of the selection.
ftxui::TableSelection::DecorateSeparatorHorizontal(Decorator); // Apply a decorator to all horizontal separators of the selection.

Canvas

See the API <ftxui/dom/canvas.hpp>

auto c = Canvas(100, 100);
c.DrawPointLine(10, 10, 80, 10, Color::Red);
auto element = canvas(c);

Drawing can be performed on a ftxui::Canvas, using braille, block, or simple characters:

Simple example:

Complex example:

ezgif com-gif-maker (3)

Table of Contents

text

vtext

paragraph

border

window

separator

gauge

graph

Colors

Palette16

Palette256

TrueColor

LinearGradient

Style

Layout

Table

Selection and Styling

Colored borders

Canvas