#terminal #tui #input

console_engine

A simple terminal framework to draw things and manage user input

36 releases (21 stable)

Uses new Rust 2021

2.5.0 Aug 8, 2022
2.4.0 Jun 4, 2022
2.3.0 Feb 6, 2022
2.2.0 Nov 5, 2021
0.7.0 May 22, 2020

#54 in Command-line interface

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326 downloads per month
Used in 2 crates

MIT license

155KB
3K SLoC

Console Engine

Crates.io docs.rs dependency status Crates.io Discussions

Changelog

This library provides simple features for handling user's input and display for terminal applications.
Besides the user input and display, this library also provides some tools to build standalone "screens" that can be used just for printing.

It uses Crossterm as main tool for handling the screen and inputs. You don't have to worry about initalizing anything because the lib will handle this for you.

Summary

Features

  • Build custom terminal display using shapes or text
  • Terminal handling with a target frame per seconds
  • Keyboard and mouse support
  • Terminal resizing support
  • You are not interested by keyboard/mouse handling, even terminal handling ? You can still build "screens" that will just print its content.
  • Embedding screens to one another
  • with feature event:
    • Manage inputs as they arrive
  • with feature form:
    • Build self-managed forms with a set of inputs (text, checkboxes ...)
    • Validate each input with a set of validation constraints

Platforms

Since it uses crossterm, it should work on Windows, Linux and Mac (see Tested Terminals on Crossterm's page).

Example usage

ConsoleEngine (managing input & output)

use console_engine::pixel;
use console_engine::Color;
use console_engine::KeyCode;

fn main() {
    // initializes a screen of 20x10 characters with a target of 3 frames per second
    // coordinates will range from [0,0] to [19,9]
    let mut engine = console_engine::ConsoleEngine::init(20, 10, 3).unwrap();
    let value = 14;
    // main loop, be aware that you'll have to break it because ctrl+C is captured
    loop {
        engine.wait_frame(); // wait for next frame + capture inputs
        engine.clear_screen(); // reset the screen
    
        engine.line(0, 0, 19, 9, pixel::pxl('#')); // draw a line of '#' from [0,0] to [19,9]
        engine.print(0, 4, format!("Result: {}", value).as_str()); // prints some value at [0,4]
    
        engine.set_pxl(4, 0, pixel::pxl_fg('O', Color::Cyan)); // write a majestic cyan 'O' at [4,0]

        if engine.is_key_pressed(KeyCode::Char('q')) { // if the user presses 'q' :
            break; // exits app
        }
    
        engine.draw(); // draw the screen
    }
}

Screens (generating output)

use console_engine::screen::Screen;
use console_engine::pixel;

fn main() {
    // create a screen of 20x11 characters
    let mut scr = Screen::new(20,11);

    // draw some shapes and prints some text
    scr.rect(0,0, 19,10,pixel::pxl('#'));
    scr.fill_circle(5,5, 3, pixel::pxl('*'));
    scr.print(11,4, "Hello,");
    scr.print(11,5, "World!");

    // print the screen to the terminal
    scr.draw();
}

Events (with feature event)

(see examples for complete source code implementation)

loop {
    // Poll next event
    match engine.poll() {
        // A frame has passed
        Event::Frame => {/* ... */}

        // A Key has been pressed
        Event::Key(keyevent) => {/* ... */}

        // Mouse has been moved or clicked
        Event::Mouse(mouseevent) => {/* ... */}

        // Window has been resized
        Event::Resize(w, h) => {/* ... */}
    }
}

Forms (with feature form)

(see examples for complete source code implementation)

// Define a theme for the form
let theme = FormStyle {
    border: Some(BorderStyle::new_light()),
    ..Default::default()
};
// Create a new Form
let mut form = Form::new(
    12,
    6,
    FormOptions {
        style: theme,
        ..Default::default()
    },
);
form.build_field::<Text>(
    "username",
    FormOptions {
        style: theme,
        label: Some("Username"),
        ..Default::default()
    },
);
form.build_field::<HiddenText>(
    "password",
    FormOptions {
        style: theme,
        label: Some("Password"),
        ..Default::default()
    },
);
/* ... */
while !form.is_finished() {
    match engine.poll() {
        /* ... */
        event => form.handle_event(event)
    }
}

Documentation

Take a look at the generated documentation.

Examples

See examples :

  • drag-and-drop : Move a rectangle with your mouse
  • emojis : Display an emoji on the terminal
  • events : Example usage of the event polling method.
  • form-choices : Example usage of a Checkbox and Radio FormFields
  • form-simple : Example creation and usage of a Form containing two inputs
  • form-text : Example usage of a Text FormField
  • form-validation : Example usage of Form Validation
  • graph : Display a graph being generated with some values.
  • lines : Draw random lines of random colors on the screen.
  • lines-fps : Same example as lines, but with a FPS counter.
  • mouse : Simple mouse clicking test
  • screen-embed : Example usage of Screen's print_screen function to embed one screen into another
  • screen-extract : Example usage of Screen's extract function to extract part of a screen
  • screen-simple : Example usage of Screen struct instead of ConsoleEngine
  • screen-swap : Swap between several Screen structures
  • scroll : Example for the scroll function
  • shapes : Shape's functions testing tool
  • snake : A simple game of snake.
  • styled-rect : Example of the rect_border function
  • tetris : A game of Tetris

Media

Trustworthiness

It is recommended to always use cargo-crev to verify the trustworthiness of each of your dependencies, including this one.

Dependencies

~0.8–4.5MB
~72K SLoC