style-stateful

A React higher-order component encapsulating style states

Rationale

When developing a Presentational component, often we have to deal with the mechanism by which
our component would translate its props/state into a set of css classes. The goal of the
StyleStateful hoc is to isolate that mechanism into a reducer like function that would map
the state and props of the component into a set of CSS states.

Example

Consider the following component:

@StyleStateful(mapPropsToStyleState)
class MyFancyInput extends React.Component {
  render () {
    return <div css-ref = 'fancy__wrap'>
      <label css-ref = 'fancy__label' >Name</label>
      <input css-ref = 'fancy__input' type = 'text' value = {this.props.value}/>
    </div>,
  }
}
//Here is our mapper
function mapPropsToStyleState(props, state) {
  //a style/css state would be activated when its associated boolean value is true
  return {
    'highlight' : props.isHightlighted,
    'valid'     : !!props.value,
    'invalid'   : !props.value
  }
}

Let’s say the component can have many css states such as : valid, invalid and highlight.
By using the Hoc (configured with the appropriate mapper as per the example), the
resulting markup of the following component
<MyFancyInput value = 'Hello World!' isHightlighted = { true }></MyFancyInput>
would be :

<div class = 'fancy__wrap fancy__wrap--highlight fancy__wrap--valid'>
  <label class = 'fancy__label fancy__label--highlight fancy__label--valid' >Name</label>
  <input class = 'fancy__input fancy__input--highlight fancy__input--valid' type = 'text' value = 'Hello World!'/>
</div>