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docs(material/theming): Update docs on accessing theme values (#28002)
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‎guides/theming-your-components.md‎

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@@ -11,46 +11,149 @@ customize components. Angular Material provides APIs for reading values from thi
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### Reading color values
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To read color values from a theme, you can use the `get-color-config` Sass function. This function
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returns a Sass map containing the theme's primary, accent, and warn palettes, as well as a flag
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indicating whether dark mode is set.
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To read color values from a theme, you can use the `get-theme-color` Sass function. This function
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supports reading colors for both the app color palettes (primary, accent, and warn), as well as the
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foreground and background palettes. `get-theme-color` takes three arguments: The theme to read from,
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the name of the palette, and the name of the color.
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Each of the color palettes (primary, accent, and warn) supports reading the following named colors:
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| Color Name | Description |
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|------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| default | The default color from this palette |
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| lighter | A lighter version of the color for this palette |
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| darker | A darker version of the color for this palette |
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| text | The text color for this palette |
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| default-contrast | A color that stands out against the this palette's default color |
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| lighter-contrast | A color that stands out against the this palette's lighter color |
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| darker-contrast | A color that stands out against the this palette's darker color |
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| [hue] | The [hue] color for the palette.<br />[hue] can be one of: 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, A100, A200, A400, A700 |
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| [hue]-contrast | A color that stands out against the [hue] color for the palette.<br />[hue] can be one of: 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, A100, A200, A400, A700 |
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The background palette supports reading the following named colors:
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| Color Name | Description |
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|--------------------------|----------------------------------------------------|
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| status-bar | The background color for a status bar |
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| app-bar | The background color for an app bar |
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| background | The background color for the app |
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| hover | The background color of a hover overlay |
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| card | The background color of a card |
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| dialog | The background color of a dialog |
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| raised-button | The background color of a raised button |
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| selected-button | The background color of a selected button |
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| selected-disabled-button | The background color of a selected disabled button |
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| disabled-button | The background color of a disabled button |
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| focused-button | The background color of a focused button |
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| disabled-button-toggle | The background color of a disabled button toggle |
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| unselected-chip | The background color of an unselected chip |
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| disabled-list-option | The background color of a disabled list option |
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| tooltip | The background color of a tooltip |
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The foreground palette supports reading the following named colors:
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| Color name | Description |
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|-------------------|----------------------------------------------------------------------------------------------------------|
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| base | The base foreground color, can be used to for color mixing or creating a custom opacity foreground color |
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| divider | The color of a divider |
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| dividers | (Alternate name for divider) |
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| disabled-text | The color for disabled text |
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| disabled | (Alternate name for disabled-text) |
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| disabled-button | The color for disabled button text |
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| elevation | The color elevation shadows |
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| hint-text | The color for hint text |
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| secondary-text | The color for secondary text |
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| icon | The color for icons |
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| icons | (Alternate name for icon) |
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| text | The color for text | |
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In addition to reading particular colors, you can use the `get-theme-type` Sass function to
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determine the type of theme (either light or dark). This function takes a single argument, the
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theme, and returns either `light` or `dark`.
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See the below example of reading some colors from a theme:
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```scss
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@use 'sass:map';
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@use '@angular/material' as mat;
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$theme: mat.define-dark-theme(...);
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$primary-default: mat.get-theme-color($theme, primary, default);
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$accent-a100: mat.get-theme-color($theme, accent, A100);
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$warn-500-contrast: mat.get-theme-color($theme, warn, 500-contrast);
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$foreground-text: mat.get-theme-color($theme, foreground, text);
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$background-card: mat.get-theme-color($theme, background, card);
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$type: mat.get-theme-type($theme);
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$custom-background: if($type == dark, #030, #dfd);
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```
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$primary: mat.define-palette(mat.$indigo-palette);
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$accent: mat.define-palette(mat.$pink-palette);
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$warn: mat.define-palette(mat.$red-palette);
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### Reading typography values
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$theme: mat.define-light-theme((
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color: (primary: $primary, accent: $accent, warn: $warn),
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));
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To read typography values from a theme, you can use the `get-theme-typography` Sass function. This
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function supports reading typography properties from the typography levels defined in the theme.
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There are two ways to call the function.
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The first way to call it is by passing just the theme and the typography level to get a shorthand
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`font` property based on the settings for that level. (Note: `letter-spacing` cannot be expressed in
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the `font` shorthand, so it must be applied separately).
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The second way to call it is by passing the theme, typography level, and the specific font property
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you want: `font-family`, `font-size`, `font-weight`, `line-height`, or `letter-spacing`.
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$color-config: mat.get-color-config($theme);
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$primary-palette: map.get($color-config, 'primary');
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$accent-palette: map.get($color-config, 'accent');
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$warn-palette: map.get($color-config, 'warn');
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$is-dark-theme: map.get($color-config, 'is-dark');
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The available typography levels are:
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| Name | Description |
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|------------|----------------------------------------------------------------------|
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| headline-1 | One-off header, usually at the top of the page (e.g. a hero header). |
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| headline-2 | One-off header, usually at the top of the page (e.g. a hero header). |
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| headline-3 | One-off header, usually at the top of the page (e.g. a hero header). |
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| headline-4 | One-off header, usually at the top of the page (e.g. a hero header). |
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| headline-5 | Section heading corresponding to the `<h1>` tag. |
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| headline-6 | Section heading corresponding to the `<h2>` tag. |
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| subtitle-1 | Section heading corresponding to the `<h3>` tag. |
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| subtitle-2 | Section heading corresponding to the `<h4>` tag. |
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| body-1 | Base body text. |
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| body-2 | Secondary body text. |
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| caption | Smaller body and hint text. |
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| button | Buttons and anchors. |
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See the below example of reading some typography settings from a theme:
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```scss
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$theme: mat.define-dark-theme(...);
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body {
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font: mat.get-theme-typography($theme, body-1);
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letter-spacing: mat.get-theme-typography($theme, body-1, letter-spacing);
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}
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```
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See the [theming guide][theme-read-hues] for more information on reading hues from palettes.
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### Reading density values
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[theme-read-hues]: https://material.angular.io/guide/theming#reading-hues-from-palettes
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To read the density scale from a theme, you can use the `get-theme-density` Sass function. This
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function takes a theme and returns the density scale (0, -1, -2, -3, -4, or -5).
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### Reading typography values
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See the below example of reading the density scale from a theme:
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```scss
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$theme: mat.define-dark-theme(...);
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To read typography values from a theme, you can use the `get-typography-config` Sass function. See
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the [Typography guide][typography-config] for more information about the typography config data
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structure and for APIs for reading values from this config.
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$density-scale: mat.get-theme-desity($theme);
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```
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[typography-config]: https://material.angular.io/guide/typography#typography-config
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### Checking what dimensions are configured for a theme
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Depending on how a theme was created, it may not have configuration data for all theming dimensions
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(base, color, typography, density). You can check if a theme has a configuration for a particular
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dimension by calling the `theme-has` Sass function, passing the theme and the dimension to check.
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See the below example of checking the configured dimensions for a theme:
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```scss
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@use '@angular/material' as mat;
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$theme: mat.define-dark-theme(...);
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$typography-config: mat.get-typography-config($theme);
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$my-font-family: mat.font-family($typography-config);
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$has-base: mat.theme-has($theme, base);
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$has-color: mat.theme-has($theme, color);
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$has-typography: mat.theme-has($theme, typography);
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$has-density: mat.theme-has($theme, density);
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```
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## Separating theme styles
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@use '@angular/material' as mat;
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@mixin color($theme) {
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// Get the color config from the theme.
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$color-config: mat.get-color-config($theme);
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// Get the primary color palette from the color-config.
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$primary-palette: map.get($color-config, 'primary');
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.my-carousel-button {
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// Read the 500 hue from the primary color palette.
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color: mat.get-color-from-palette($primary-palette, 500);
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color: mat.get-theme-color($theme, primary, 500);
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}
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}
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@mixin typography($theme) {
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// Get the typography config from the theme.
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$typography-config: mat.get-typography-config($theme);
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.my-carousel {
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font-family: mat.font-family($typography-config);
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// Get the headline font from the theme.
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font: mat.get-theme-typography($theme, headline-1);
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}
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}
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```
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@use '@angular/material' as mat;
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@mixin color($theme) {
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// Get the color config from the theme.
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$color-config: mat.get-color-config($theme);
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// Get the primary color palette from the color-config.
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$primary-palette: map.get($color-config, 'primary');
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.my-carousel-button {
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// Read the 500 hue from the primary color palette.
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color: mat.get-color-from-palette($primary-palette, 500);
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color: mat.get-theme-color($theme, primary, 500);
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}
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}
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@mixin typography($theme) {
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// Get the typography config from the theme.
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$typography-config: mat.get-typography-config($theme);
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.my-carousel {
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font-family: mat.font-family($typography-config);
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// Get the headline font from the theme.
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font: mat.get-theme-typography($theme, headline-1);
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}
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}
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@mixin theme($theme) {
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$color-config: mat.get-color-config($theme);
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@if $color-config != null {
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@if mat.theme-has($theme, color) {
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@include color($theme);
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}
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$typography-config: mat.get-typography-config($theme);
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@if $typography-config != null {
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@if mat.theme-has($theme, typography) {
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@include typography($theme);
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}
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}

‎guides/theming.md‎

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### Reading hues from palettes
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You can use the `get-color-from-palette` function to get specific hues from a palette by their
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number identifier. You can also access the contrast color for a particular hue by suffixing the
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hue's number identifier with `-contrast`.
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It is possible to read colors from a theme for use in your own components. For more information
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about this see our guide on [Theming your own components][reading-colors].
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```scss
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@use '@angular/material' as mat;
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$my-palette: mat.define-palette(mat.$indigo-palette);
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.my-custom-style {
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background: mat.get-color-from-palette($my-palette, 500);
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color: mat.get-color-from-palette($my-palette, '500-contrast');
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}
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```
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You can also reference colors using the `"default"`, `"lighter"`, `"darker"`, and `"text"` colors
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passed to `define-palette`.
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```scss
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@use '@angular/material' as mat;
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$my-palette: mat.define-palette(mat.$indigo-palette);
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.my-custom-darker-style {
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background: mat.get-color-from-palette($my-palette, 'darker');
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color: mat.get-color-from-palette($my-palette, 'darker-contrast');
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}
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```
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[reading-colors]: https://material.angular.io/guide/theming-your-components#reading-color-values
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## Customizing density
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‎guides/typography.md‎

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### Reading typography values from a config
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You can read typography style values from a typography config via the following Sass functions. Each
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accepts a typography config and a level.
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It is possible to read typography properties from a theme for use in your own components. For more
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information about this see our guide on [Theming your own components][reading-typography].
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| Function | Example usage |
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|------------------|------------------------------------------|
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| `font-size` | `mat.font-size($config, 'body-1');` |
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| `font-family` | `mat.font-family($config, 'body-1');` |
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| `font-weight` | `mat.font-weight($config, 'body-1');` |
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| `line-height` | `mat.line-height($config, 'body-1');` |
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| `letter-spacing` | `mat.letter-spacing($config, 'body-1');` |
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Additionally, you can use the `typography-level` Sass mixin to directly emit the CSS styles for a
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given typography level.
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```scss
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@use '@angular/material' as mat;
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// Use the default configuration.
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$my-typography: mat.define-typography-config();
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.some-class-name {
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@include mat.typography-level($my-typography, 'body-1');
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}
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```
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[reading-typography]: https://material.angular.io/guide/theming-your-components#reading-typography-values

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