Color Scheme

An easy way to manage the defaults and custom Color Schemes for your components, libraries and web sites.

The purpose of this library is to allow your own components/libraries to implement the use of color schemes, so you can give the users the option to choose or update them as needed.

All given Color Schemes will be added as new <style> tags within the <head> element.
The default ('light') or given Color Scheme will be established in the <html> tag.

This library was generated with Angular CLI version 12.2.0.

Index

Installation
The Types and Interfaces
The Service
- Public Methods, Properties, Getters and Setters
The Components
- Dropdown Selector
- Checkbox
Examples

Installation

Install npm package:

npm install @a11y-ngx/color-scheme --save
Import A11yColorSchemeModule into your module or standalone component:

import { A11yColorSchemeModule } from '@a11y-ngx/color-scheme';

@NgModule({
    declarations: [...],
    imports: [
        ...
        A11yColorSchemeModule
    ]
})
export class AppModule { }

CHECK ALSO: The rootConfig() and setColorScheme() methods.

The `rootConfig()` Method

Serves the purpose of configuring the basics for the entire Color Scheme system within your website.

⚠️ IMPORTANT: It's not meant to be used within a component/library. For that, please use the setColorScheme() method.

Accepts a single parameter config of type ColorScheme or the ColorSchemeGlobalConfig object.

A11yColorSchemeModule.rootConfig('dark'),
// or...
A11yColorSchemeModule.rootConfig({
    useScheme: 'dark',
    ...
}),

The `setColorScheme()` Method

Serves to establish one or more sub level configurations based on a given selector.

This comes handy when you need to add a custom set of properties and styles for the Color Scheme on a particular component or library.

Accepts a single parameter config of type ColorSchemeConfig or an array of them, so you can configure multiple selectors.

A11yColorSchemeModule.setColorScheme({
    selector: 'my-custom-library',
    ...
}),

The Types and Interfaces

The Color Scheme

Type: ColorScheme.
Of type: string, it accepts the values:
- Generics: 'light', 'dark' or 'auto' (defined by the system).
- Custom: Any given code-name from the new custom Color Scheme.

The Global Config

Type: ColorSchemeGlobalConfig.
Properties:

The global configuration comes with a set of basic properties of CSS variables ready to be used:

Property	CSS Variable	Light	Dark
`a11yBackgroundColor`	`--a11y-bg-color`	`'rgb(255 255 255 / 98%)'`	`'rgb(31 31 31 / 98%)'`
`a11yTextColor`	`--a11y-text-color`	`'#222'`	`'#FFF'`
`a11yBorderColor`	`--a11y-border-color`	`'#656565'`	`'#555'`
`a11yShadow`	`--a11y-shadow`	`'5px 5px 10px -5px'`	`'5px 5px 10px -5px'`
`a11yShadowColor`	`--a11y-shadow-color`	`'#444'`	`'#444'`
`a11yFocusVisible`	`--a11y-focus-visible`	`'0 0 0 2px #FFF, 0 0 0 4px #444'`	`'0 0 0 2px #555, 0 0 0 4px #FFF'`

The Global Config: Use Scheme

To set which Color Scheme to be used.

Config Property: useScheme (optional).
Type: ColorScheme.
Default: 'light'.

The Global Config: Allow User to Change Scheme

To allow the user to change the Color Scheme.

Config Property: allowUserToChangeScheme (optional).
Type: boolean.
Default: true.

The Global Config: Default Names

To set the default names for the basic Color Schemes: light, dark or auto, all of type string.

See the Default Names Example.

Config Property: defaultNames (optional).
Type: ColorSchemeDefaultNames.
Default: {} (unset).

The Global Config: New Schemes

To provide new Color Schemes.

Config Property: newSchemes (optional).
Type: ColorSchemeItem[].
Default: [].

The Global Config: New Scheme Item

The new Scheme item.

Type: ColorSchemeItem.
Properties:
- value of type ColorScheme: The unique code-name (hyphen separated, preferably) of the Color Scheme.
- name of type string: The readable name of the Color Scheme.
- scheme of type ColorSchemeProperties: The properties for the Color Scheme.

Check the New Schemes example.

The Global Config: Append Styles Map

To provide new properties to the current styles map. See the basic properties within the styles map.

IMPORTANT: The current properties values are not going to be override, since they are being used by other libraries.

Config Property: appendStylesMap (optional).
Type: ColorSchemeCSSMap.

The Global Config: Attribute Selector Match

The CSS attribute's name to match the Color Scheme.

Config Property: attributeSelectorMatch (optional).
Type: string.
Default: 'color-scheme'.

As mentioned above, the default is set to 'color-scheme', which will result on color-scheme="..." applied to the <html> element.

Check the Attribute Selector Match example.

The Color Scheme Config

Used inside the setColorScheme() method, it serves the purpose of configuring the Color Scheme for a new component or library based on a given selector.

Type: ColorSchemeConfig.
Properties:
- selector.
- styles.
- stylesMap.
- cssTagID.
- It also implements the properties from the Styles Config type.
  - forceScheme.
  - useBootstrapStyles.

Check the Color Scheme Config example.

The Color Scheme Config: Selector

The element selector to apply the Color Scheme config to.

Config Property: selector.
Type: string.

The Color Scheme Config: Styles Object

An object with the properties and values for each style your component/library needs.

Config Property: styles.
Type: ColorSchemeProperties or ColorSchemesObject.

The ColorSchemeProperties is a basic group of properties, it won't contain individual schemes. It will serve the sole purpose of create a root set of CSS properties.

const STYLES: ColorSchemeProperties = {
    backgroundColor: '#DDD',
    textColor: '#999',
    borderSize: 1,
    fadeMs: 200,
};

The ColorSchemesObject is a more complex group of properties, which will contain generic items as well as individual schemes.

Properties:

generics of type ColorSchemeProperties:
- In here we can add those properties that are generic (not color related).
schemes of type ColorSchemes:
- In here we have to specify each color scheme by its code-name and, within, its properties (of type ColorSchemeProperties):
  - light is mandatory, since it will be used as the default scheme.
  - dark is optional.
  - 'code-name' also optional, you can add as many custom color schemes as you need.

const STYLES: ColorSchemesObject = {
    generics: {
        borderSize: 1,
        fadeMs: 200,
    },
    schemes: {
        light: { // mandatory
            backgroundColor: '#DDD',
            textColor: '#999',
        },
        dark: {}, // optional
        red: {}, // being 'red' the code-name
        blue: {}, // being 'blue' the code-name
    },
};

The Color Scheme Config: Styles Map Object

The properties to map within each config.

Config Property: stylesMap.
Type: ColorSchemeCSSMap.
- The property will be a string of your choosing.
- The value could be:
  - string: The property to map.
  - ColorSchemeCSSProperty: It's an object that could contain:
    - property of type string: The property to map.
    - suffix (optional) of type string: The suffix to apply to the CSS property.
    - ignoreIfUsingBS (optional) of type boolean: Read the note below.

NOTE: The use of ignoreIfUsingBS applies only if you are allowing the use of Bootstrap and/or custom styles, then you allow the property to be ignored in case useBootstrapStyles was set to true within the Color Scheme Config.

The map will be conformed by a list of properties and their values.
Those values will be applied as the final CSS property, meaning that you can either use 'background-color' or, as a variable, '--bg-color'.
For those values that you need to be numeric, for internal calculation purposes, but applied as "px" or "ms" in the final CSS, you can make use of the suffix. See the use of borderSize and fadeMs in the Color Scheme Config Example.

The Color Scheme Config: CSS Tag ID

The ID to apply to the <style> tag.

NOTE: If no value is passed, a generic one will be assigned based on the selector provided.

Config Property: cssTagID (optional).
Type: string.

The Color Scheme Config: Styles Config

This type is meant to be implemented within a custom library, so you can give the user the power to choose among two more options.

Type: ColorSchemeStylesConfig.
Properties:
- forceScheme.
- useBootstrapStyles.

The Color Scheme Config: Force Scheme

To force the use of the given Color Scheme.

Config Property: forceScheme.
Type: ColorScheme.

The Color Scheme Config: Use Bootstrap Styles

Whether it will use Bootstrap 5.3 (or above) styles or custom.

Config Property: useBootstrapStyles.
Type: boolean.

The Service

The Service: Public Methods, Properties, Getters and Setters

Name	Type	Of Type	Description
`colorSchemeChanged`	`property`	`BehaviorSubject<ColorSchemeChange>`	See the Color Scheme Change
`colorSchemes`	`get`	`ColorSchemeItem[]`	The configured color schemes
`userChosen`	`get`/`set`	`ColorScheme`	See the Service: User Chosen
`allowUserToChangeScheme`	`get`	`boolean`	See the Config: Allow User to Change Scheme
`rootConfig`	`get`	`ColorSchemeConfig`	The root (global) configuration
`useBootstrapStyles()`	`method`	`boolean`	See Use Bootstrap Styles method
`getCurrentScheme()`	`method`	`ColorSchemeProperties`	See Get Current Scheme method
`getConfig()`	`method`	`ColorSchemeConfig`	See the Get Config method
`setConfig()`	`method`	`void`	See the Set Config method
`updateConfig()`	`method`	`void`	See the Update Config method
`getCustomStyles()`	`method`	`CSSStyleDeclaration`	See the Get Custom Styles method

The Service: Color Scheme Change

To subscribe and get notified when the color scheme has changed, either by the user or the system.

Property: colorSchemeChanged.
Type: ColorSchemeChange.
Properties:
- colorSchemePrevious of type ColorScheme: The previous scheme.
- colorSchemeCurrent of type ColorScheme: The current scheme.
- changedBy of type 'user' or 'system': Who changed the scheme.

The Service: User Chosen

The color scheme the user has chosen.

Property: userChosen.
Type: ColorSchemeChange.
- Get: Either the code-name of the chosen color scheme or auto, which means that will use the system's.
- Set: To set what the user has chosen.
  - If 'auto' is set (as by default):
    - The current system scheme will be applied.
    - An event listener will start listening for changes from the system to apply it as soon as it gets triggered.
  - If a code-name is set:
    - The event listener will be stopped.

The Service: `useBootstrapStyles()` Method

To know whether the given selector was configured to use Bootstrap styles or not. See the Config: Use Bootstrap Styles.

Accepts a single parameter selector of type string and returns a boolean.

The Service: `getCurrentScheme()` Method

To get the current Color Scheme values for a given selector.

Accepts a single parameter selector of type string and returns an object with all the properties of the scheme of type ColorSchemeProperties.

The Service: `getConfig()` Method

To get the config from a given selector.

Accepts a single parameter selector of type string and returns the config object of type ColorSchemeConfig.

The Service: `setConfig()` Method

To set a new config.

Accepts a single parameter config of type ColorSchemeConfig.

The Service: `updateConfig()` Method

To update a config with new values from a given selector.

If you are creating your own component/library with custom color schemes, you can use this method to update it whenever you need.

Accepts three parameters:

selector of type string.
config of type any, ColorSchemeProperties or ColorSchemesObject.
colorSchemesProperty (optional) of type string:
- To specify a custom property within the given config (if type any was provided) to search for the properties to update.

The Service: `getCustomStyles()` Method

Process and returns a string with all the CSS properties and values ready to be inserted in the style property of an element.

The method accepts two parameters:

selector of type string.
customConfig of type ColorSchemeProperties.

This serves the purpose to allow the user to customize a single instance of that selector, while the rest will use the global values set for it.

NOTE: If within the customConfig, one or more of the values are equal to the global's, they will be ignored and won't be returned, since they are already set in the <style> tag created when the setColorScheme() method was invoked the first time.

Check the Get Custom Styles example.

The Components

Two basic components to allow the user to change the Color Scheme on the page.

NOTE: For both components:

The disabled state will depend not only on the @Input() but also on the allowUserToChangeScheme property set on the global config.

The useBootstrapStyles will make use of the class names within Bootstrap 5.3 (or above) so, in case you are using it within your site, either of the components will look with those styles.

The Component: Dropdown Selector

A simple dropdown selector to allow the user to choose between any of the basic, custom or auto (System's) schemes.

Selector: 'a11y-color-scheme-select'.
Inputs:

Name Type Default

label string 'Color Scheme'

disabled boolean false

useBootstrapStyles boolean false

Name	Type	Default
`label`	`string`	`'Color Scheme'`
`disabled`	`boolean`	`false`
`useBootstrapStyles`	`boolean`	`false`

Dropdown Selector - Default Use

<a11y-color-scheme-select>
</a11y-color-scheme-select>

Dropdown Selector - Custom Label

For this example, two new Color Schemes were added using the Global Config New Schemes (see also the New Schemes Example).

<a11y-color-scheme-select label="Pick a Scheme">
</a11y-color-scheme-select>

Dropdown Selector - Using Bootstrap

<a11y-color-scheme-select
    label="Pick a Scheme"
    [useBootstrapStyles]="true">
</a11y-color-scheme-select>

The Component: Checkbox

A simple checkbox to allow the user to choose between light or dark schemes.

Selector: 'a11y-color-scheme-checkbox'.
Inputs:

Name Type Default

label string 'Dark Mode'

disabled boolean false

useBootstrapStyles boolean false

Name	Type	Default
`label`	`string`	`'Dark Mode'`
`disabled`	`boolean`	`false`
`useBootstrapStyles`	`boolean`	`false`

Checkbox - Default Use

<a11y-color-scheme-checkbox>
</a11y-color-scheme-checkbox>

<a11y-color-scheme-checkbox [disabled]="true">
</a11y-color-scheme-checkbox>

Checkbox - Using Bootstrap

<a11y-color-scheme-checkbox [useBootstrapStyles]="true">
</a11y-color-scheme-checkbox>

Examples

The Attribute Selector Match Example

NOTE: If you are using Bootstrap 5.3 (or above), they make use of 'data-bs-theme' attribute selector, so you can change it to that value.

Let's say you want to define the default scheme to 'dark':

A11yColorSchemeModule.rootConfig('dark'),

<html lang="en" color-scheme="dark">
    ...
</html>

Now, you want to implement your own custom CSS selector for your themes called 'current-theme' and set the default scheme as 'red-velvet':

A11yColorSchemeModule.rootConfig({
    useScheme: 'red-velvet',
    attributeSelectorMatch: 'current-theme'
}),

<html lang="en" current-theme="red-velvet">
    ...
</html>

The Color Scheme Config Example

Let's say you want to create a library with custom background color, text color, fade timeout and border size for each of your schemes (light, dark and red-velvet), you should create the styles and map objects as follows:

The Styles Object:

NOTE: Remember that, in this case, the border size and fade timeout are generic to your styles, you can set them into the generics group and the rest, since they are color related, into the schemes group. See the ColorSchemesObject.

const STYLES: ColorSchemesObject = {
    generics: {
        borderSize: 1,
        fadeMs: 200,
    }
    schemes: {
        light: {
            backgroundColor: '#DDD',
            textColor: '#999',
        },
        dark: {
            backgroundColor: '#999',
            textColor: '#DDD',
        },
        'red-velvet': {
            backgroundColor: '#BE1F31',
            textColor: '#FFD9A1',
        },
    }
};

The Styles Map Object:

NOTE: You can use the value as a normal CSS property like border-width or as a variable name, like --bg-color.

const STYLES_MAP: ColorSchemeCSSMap = {
    backgroundColor: '--bg-color',
    textColor: '--txt-color',
    borderSize: {
        property: 'border-width',
        suffix: 'px',
    },
    fadeMs: {
        property: '--fade-ms',
        suffix: 'ms',
    },
}

The Import of the Color Scheme Module in your Library:

A11yColorSchemeModule.setColorScheme({
    selector: 'my-custom-component',
    styles: STYLES,
    stylesMap: STYLES_MAP,
    cssTagID: 'my-custom-component-styles',
}),

The Styles Results:

<style id="my-custom-component-styles">
/* Light Color Scheme */
my-custom-component {
    --bg-color: #DDD;
    --txt-color: #999;
    --fade-ms: 250ms;
    border-width: 1px;
}
/* Dark Color Scheme */
[color-scheme="dark"] my-custom-component {
    color-scheme: dark;
    --bg-color: #999;
    --txt-color: #DDD;
}
/* Red Velvet Color Scheme */
[color-scheme="red-velvet"] my-custom-component {
    color-scheme: normal;
    --bg-color: #BE1F31;
    --txt-color: #FFD9A1;
}
</style>

The Default Names Example

Lets say your website is in spanish, so you want to provide the right translation for the generic names for when you use the Dropdown Selector component or at any moment you want to consume the configured color schemes list of items by using the colorSchemes getter from the service.

A11yColorSchemeModule.rootConfig({
    defaultNames: {
        light: 'Claro',
        dark: 'Oscuro',
        auto: 'Igual al Sistema',
    },
}),

<a11y-color-scheme-select label="Esquema de Color">
</a11y-color-scheme-select>

The New Schemes Example

Now you want to define a new color scheme "Red Velvet" for your project and use it as default:

A11yColorSchemeModule.rootConfig({
    useScheme: 'red-velvet', // to use it as default
    newSchemes: [
        {
            value: 'red-velvet',
            name: 'Red Velvet',
            scheme: {
                a11yBackgroundColor: '#A1C5EA',
                a11yTextColor: '#001D6C',
                ...
            },
        }
    ],
}),

Get Custom Styles Example

Lets continue with the Color Scheme Config example.

In your component, you are allowing three inputs:

@Input() bgColor: string;
@Input() textColor: string;
@Input() fadeMs: number;

Now, when the view inits, you can establish those custom styles to your main element:

@HostBinding('style') private customVariables: CSSStyleDeclaration;

constructor(private colorSchemeService: ColorSchemeService) {}

ngAfterViewInit(): void {
    const config = {
        // remember that the config's property needs to match the one
        // from the styles map you established when using setColorScheme()
        backgroundColor: this.bgColor,
        textColor: this.textColor,
        fadeMs: this.fadeMs,
    } as ColorSchemeProperties;

    this.customVariables = this.colorSchemeService.getCustomStyles(
        'my-custom-component',
        config
    );
}

This way, when the user sets the values for each input as:

<my-custom-component
    backgroundColor="#000"
    textColor="white"
    fadeMs="300">
</my-custom-component>

Your main component will be rendered as follows:

<my-custom-component style="
    --bg-color: #000;
    --txt-color: white;
    --fade-ms: 300ms;">
</my-custom-component>

...and your stylesheet will do the rest, since you are using CSS variables and will take those from this specific instance of the component.

@a11y-ngx/color-scheme

Color Scheme

Index

Installation

The rootConfig() Method

The setColorScheme() Method

The Types and Interfaces

The Color Scheme

The Global Config

The Global Config: Use Scheme

The Global Config: Allow User to Change Scheme

The Global Config: Default Names

The Global Config: New Schemes

The Global Config: New Scheme Item

The Global Config: Append Styles Map

The Global Config: Attribute Selector Match

The Color Scheme Config

The Color Scheme Config: Selector

The Color Scheme Config: Styles Object

The Color Scheme Config: Styles Map Object

The Color Scheme Config: CSS Tag ID

The Color Scheme Config: Styles Config

The Color Scheme Config: Force Scheme

The Color Scheme Config: Use Bootstrap Styles

The Service

The Service: Public Methods, Properties, Getters and Setters

The Service: Color Scheme Change

The Service: User Chosen

The Service: useBootstrapStyles() Method

The Service: getCurrentScheme() Method

The Service: getConfig() Method

The Service: setConfig() Method

The Service: updateConfig() Method

The Service: getCustomStyles() Method

The Components

The Component: Dropdown Selector

Dropdown Selector - Default Use

Dropdown Selector - Custom Label

Dropdown Selector - Using Bootstrap

The Component: Checkbox

Checkbox - Default Use

Checkbox - Using Bootstrap

Examples

The Attribute Selector Match Example

The Color Scheme Config Example

The Default Names Example

The New Schemes Example

Get Custom Styles Example

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