Hydra is a terminal interface library written in crystal.
This is my first project in Crystal and my first interface library, so the code may go through various changes.
I would be very happy to have propositions on how to improve the code / the architecture of the library.
Also, I should write more test :shame:
You'll need to install the dependencies using shards install
You'll also need the development libraries for libtermbox.
Example for Manjaro:
yaourt -S termbox-git
You can run file_manager.cr in order to see the library in action.
crystal run examples/file_manager.cr
There are various examples that showcase the different features.
Minimal setup is:
app = Hydra::Application.setup # => Nothing happens for the user
# Once the application is running, pressing ctrl-c will stop it.
app.bind("keypress.ctrl-c", "application", "stop")
# Define elements and events here
app.run # => Screen is cleared and the application is displayed
# The application will loop until ctrl-c is pressed
app.teardown # => Reset the screen
You can add elements and display them on the screen.
app = Hydra::Application.setup
app.add_element({
:id => "my-text",
:type => "text",
:value => "Hello World",
})
el = Hydra::Element.new(...)
app.add_element(el)
An element must have a unique id and a type, see bellow for available types. The id is used by the events mechanism (see bellow).
Elements are visible by default and can be hidden:
el = Hydra::Element.new(...) # => el is visible
el = Hydra::Element.new({ :visible => "false", ...}) # => el is hidden
el.show
el.hide
Elements can be positioned:
el = Hydra::Element.new({ :position => "3:7", ...}) # => el has an absolute position x = 3, y = 7
el = Hydra::Element.new({ :position => "center", ...}) # => el is positioned at the bottom of the screen
See Hydra::View#render_element
for the supported values for position.
Elements can then be moved:
el = Hydra::Element.new({ :position => "3:7", ...}) # => el has an absolute position x = 3, y = 7
el.move(4, 8) # => el is now at x = 4, y = 8
You can add custom elements to your application:
class MyElement < Hydra::Element
# Define new methods
# Override Hydra::Element#trigger or any other method
end
app = Hydra::Application.setup
el = MyElement.new(...)
app.add_element(el)
There is a class to handle an elements collection: ElementsCollection
, it provides utility methods.
The text element is used to display single or multiline text.
This is your <input type="text"> element: it allows the user to enter a string.
A list of various elements, user can select one.
A box that display the latest messages it has received. Scroll included.
- asynchronous.cr
- colors.cr
- file_manager.cr
- keypress.cr
- list.cr
- moving_elements.cr
- prompts.cr
- state.cr
- websocket_application.cr
- websocket_client.cr
- Fork it (https://github.com/Ghrind/hydra/fork)
- Create your feature branch (git checkout -b my-new-feature)
- Commit your changes (git commit -am 'Add some feature')
- Push to the branch (git push origin my-new-feature)
- Create a new Pull Request
Contributors
- Ghrind - Benoît Dinocourt - creator, maintainer