joyent-portal/packages/ui-toolkit/src/baseline
2017-05-25 21:07:34 +01:00
..
index.js chore(portal-data): move portal-data to packages 2017-05-25 21:07:34 +01:00
readme.md chore: initial lerna setup 2017-05-25 10:56:50 +01:00

In the mockups, the spacing between elements is done through a baseline grid.

What that means is that spacing is measured in units over a base. I.e. 1.5 unit where the base is 6px corresponds to 9px.

{insert image from sketch}

To allow a declarative way of defining spacing in every component in our UI framework, a composer was written that styles each component instance with based on the props passed to it. E.g.:

<Button margin='2'>Hello World</Button>

Is going to translate into a <Button /> that has 12px of margin.

What enables this is the Baseline composer.

The Baseline composer is essentially an HOC: It exposes a function that accepts a Component as a parameter. That component is then wrapped in a styled-component.

The styled-component that wraps the Component just goes through a list of supported rules - see list below. From each rule it does the match to the corresponding prop and calculates the rem.

List of supported props:

  • border
  • margin
  • marginTop
  • marginRight
  • marginBottom
  • marginLeft
  • padding
  • paddingTop
  • paddingRight
  • paddingBottom
  • paddingLeft
  • borderTopWidth
  • borderRightWidth
  • borderBottomWidth
  • borderLeftWidth

To use this composer, you just do it as you would with any other HOC:

// component implementation
const Button = (props) => (
  <button>my button</button>
);

// export Button wrapped
export default Baseline(Button);

Whoever required that <Button />, will be able to declare any of the properties especified above and have the style of the component be applied accordingly.

examples

const Button = require('../button').default;

<span>
  <Button marginRight='1'>margin-right: 1</Button>
  <Button marginRight='2'>margin-right: 2</Button>
  <Button marginRight='3'>margin-right: 3</Button>
  <Button marginRight='4'>margin-right: 4</Button>
  <Button>hello</Button>
</span>