Badr (Full moon in Arabic) is a easy and enjoyable way to write user interfaces, prioritizing developer experience, composition and readability 🌝

Copy badr.lua to your project.
🌙 For a functional example see: example.lua

function love.load()
    menu = component { column = true, gap = 10 }
        + label 'Hello, World!'
        + label { text = 'love2d', id = '#2' }
        + button {
            text = 'Click me!',
            onClick = function(self)
                -- get child by id
                (self.parent % '#2').text = 'awesome'
            end
        }
end

Each component acts as a container for values and includes a draw function.There are some default properties (id (string), x, y, width, height, visible, parent and children). However, you can pass any additional values to a component and utilize them as needed. To create a custom component, simply override the draw function, for inspiration take a look at components.

Badr offers built-in support for simple layout composition with row(boolean), column(boolean), and gap(number). For more advanced layouts, you can implement custom drawing logic.

local newComponent = component {
  x = 10,
  y = 10,
  myCustomProp = true,
  customFunction = myCustomLogic(),
  draw = function(self)
      -- your drawing logic here
      -- don't forget to loop through children to draw them
      if not self.visible then return end
      love.graphics.print('Hello!', self.x, self.y)
  end,
}

To append a child component to a parent component, you can use the following syntax parent = parent + child.

Composition allows you to break your UI into simple, independent components. This approach offers greater flexibility and scalability.

local customComponent = component { row = true, gap = 10 }
    + label 'second'
    + label 'third'
local mainComponent = component { column = true }
    + label 'first'
    + customComponent
    + (component() + label 'fourth') -- this work also

To remove a child component from its parent, you can use the following syntax: parent = parent - child. To hide a component you can use component.visible = false.

To update a child component, you can directly modify its value using: child.value = newValue. For continuous updates, use :onUpdate(), and ensure to call component update method.

To retrieve a child component by its id (string), you can use the following syntax:, use the following syntax: parent % id. This will return the targeted child component

To update the position of a child component and all its children, you can use the following syntax :updatePosition(x,y).

To animate any component, you can use flux. If you want to animate a component and all its children, you can use :animate().

button {
    text = 'Click for animation',
    onClick = function(self)
        -- Animate this component
        self.opacity = 0
        flux.to(self, 0.4, { opacity = 1 })
        -- Animate the whole tree
        self.parent:animate(function(s)
            -- note that we pass the current position
            flux.to(s, 2, { x = s.x + 250 })
        end)
    end,
}

To check if the mouse is within a component, you can use :isMouseInside(). Badr uses mouse.isDown() to check for mouse clicks. Feel free to use your own methods when creating your components.
Feedback and ideas appreciated ✨

This library is free software; you can redistribute it and/or modify it under the terms of the MIT license. See LICENSE for details.