IU

UI framework based on the Fusion/libui.cr library, with custom elements from watzon/cru.

Motivation

Currently avaliable Crystal UI frameworks are either not maintained anymore or the documentation is scarce and a single error might cause a developer to lose motivation, which is why I decided to build IU on top of the LibUI framework which is a multi-platform powerful UI toolkit.

Build status

Features

Widgets

• Horizontal box, Vertical box, Checkbox, Combobox, Editable combobox.
• Button, Font button, Color button, Radio button.
• Datetime picker, Progress bar, Slider, Spinbox.
• Text entry, Multiline text entry.
• Form, Grid, Group, Table, Tab, Separator.
• Image, Label.
• Window, Menubar, Area.
• Many more.

Platforms

• Mac OSX
• Linux
• Windows (Once crystal will be available on Windows)

Code example

require "iu"

module Example
  include Iu::Components

  # Ability to reuse components extracted to other classes.
  class MyComponent < Iu::ReusableComponent
    def initialize(@id : Int32); end

    def render : Iu::Component
      Group
        .new(title: "MyComponent", margined: true)
        .adopt(
          VerticalBox
            .new(padded: true)
            .adopt(
              Label.new(text: "Hello, World ##{@id}!"),
              stretchy: true
            )
            .adopt(
              Button.new(text: "Click Me!"),
              stretchy: true
            )
        )
    end
  end

  # :nodoc:
  class Application < Iu::Application
    def initialize_component
      window =
        Window.new(
          title: "Example",
          width: 800,
          height: 600,
          menu_bar: false
        )
      
      window.margined = true

      window
        .adopt(
          HorizontalBox
            .new(padded: true)
            .adopt(
              MyComponent.new(1),
              stretchy: true
            )
            .adopt(
              MyComponent.new(2),
              stretchy: true
            )
            .adopt(
              MyComponent.new(3),
              stretchy: true
            )
        )

      window.closing.on do
        exit(0)
      end
      
      window.show
    end
  end
end

app = Example::Application.new

app.should_quit.on do
  exit(0)
end

app.start

Installation

1. Follow the instructions for installation laid out in andlabs/libui.
2. Copy the compiled files from step 1 (i.e. files in build/out) to /usr/lib for OSX and Linux users.
3. Go to your shard.yml file, and enter this in:

dependencies:
  iu:
    github: grkek/iu

4. Run shards install.