Vivid Scheme

#### Scheme provides color context to Vivid components & applications. It is an integral part of packages, which are subject to the scheme's color tokens.

!Scheme Featured Image

This package is imported and executed by default in all core dependent packages but can also be consumed on its own.
By default, (if not explicitly defined otherwise by the consumer) scheme will result in the user's preferred os option (light|dark|auto)

Each scheme will provide the same exact color tokens to support main context and its alternating - contrasting - context (e.g. sidenav, top-bar etc'...). Once imported and set, these tokens are reflected as CSS variables.

!Scheme graph

Scheme will apply main context on _body_ selector and will never apply alternate unless explicitly set.
To also be able to modify HTML scopes manually in apps, we include the following css selectors:
##### main
- body
- .vvd-scheme-main
- ::part(vvd-scheme-main) - for elements within a shadow tree with a matching part attribute
##### alternate
- .vvd-scheme-alternate
- ::part(vvd-scheme-alternate) - for elements within a shadow tree with a matching part attribute

Installation

``bash
yarn add @vonage/vvd-scheme
`
or
`bash
npm i @vonage/vvd-scheme
`

Consumption

`html

`
or
`js
import scheme from '@vonage/vvd-scheme';
`

As colors are critical identities of our style, it's advised to include a link type:modulepreload to hint the browser of the module importance, its high priority and preemptively fetch it.
`html

`

Features:

| Name | Description |
|-------------------------|-------------|
| set | a method to set the scheme. options: _light_, _dark_, _syncWithOsSettings_ (defaults to _syncWithOsSettings_) |
| eventBus | acts as EventTarget to polyfill the absence of element. can be hooked and callback upon selection - eventBus.addEventListener('vvd-scheme-select', console.log);` |
| getSelectedScheme | get current applied scheme (_light_, _dark_)|
| getSelectedSchemeOption | get current option (_light_, _dark_, _syncWithOsSettings_) |

$3

Scheme is nicely paired with the vwc-theme-switch UI component that toggles the available options.