## Standard for Theming

This is a __standard__ for theming of components. Developers and especially publishers of components should use it to unify their theming API across all components.

Currently a number of UI libraries are using different approaches. Some of them are very opinionated and bad by design, others just don't have the desired flexibility.

__We can differentiate 3 approaches:__

1. Traditional CSS class names.
1. Generated CSS class names.
1. Inline Styles.

In order to allow component authors to use __any__ of this approaches, we need to define a Theme Interface.

- [Spec](./spec.md)
- [See React Examples.](./react-examples)

### Theme Styles vs. System Styles

A Component author needs to differentiate System Styles from Theme Styles. More styles in a Theme means more flexibility for the user. System styles should be used for parts of components which can not or should not be customizable.

A Theme should define:

1. Font
1. Colors
1. Images
1. Text direction
1. Shadows
1. Rounded Corners
1. Animations
1. Margins
1. Paddings

When components logic uses some Theme property, it should be a Theme Option.

### Development

This is an early stage proposal. Feel free to create issues and discribe use cases. Also feel free to make the wording better.