_card-theme.scss

@use '../core/theming/theming';
@use '../core/mdc-helpers/mdc-helpers';
@use '../core/style/private';
@use '../core/typography/typography';
@use '@material/card/elevated-card-theme' as mdc-elevated-card-theme;
@use '@material/card/outlined-card-theme' as mdc-outlined-card-theme;
@use '@material/typography' as mdc-typography;
@use '@material/theme/theme-color' as mdc-theme-color;
@use 'sass:color';
@use 'sass:map';
@use 'sass:meta';

@mixin color($config-or-theme) {
  $config: theming.get-color-config($config-or-theme);
  $foreground: map.get($config, foreground);

  @include mdc-helpers.using-mdc-theme($config) {
    $on-surface: mdc-theme-color.prop-value(on-surface);
    $surface: mdc-theme-color.prop-value(surface);

    .mat-mdc-card {
      // MDC's theme has `container-elevation` and `container-shadow-color` tokens, but we can't
      // use them because they output under a `.mdc-card` selector whereas the rest of the theme
      // isn't under any selector. Even if the mixin is pulled out of the selector, it throws a
      // different error.
      @include private.private-theme-elevation(1, $config);
      @include mdc-elevated-card-theme.theme((
        container-color: $surface,
      ));
    }

    .mat-mdc-card-outlined {
      @include private.private-theme-elevation(0, $config);
      @include mdc-outlined-card-theme.theme((
        outline-color: if(
          meta.type-of($on-surface) == color and meta.type-of($surface) == color,
          color.mix($on-surface, $surface, 12%),
          $on-surface
        )
      ));
    }

    // Card subtitles are an Angular Material construct (not MDC), so we explicitly set their
    // color to secondary text here.
    .mat-mdc-card-subtitle {
      color: theming.get-color-from-palette($foreground, secondary-text);
    }
  }
}

@mixin typography($config-or-theme) {
  $config: typography.private-typography-to-2018-config(
      theming.get-typography-config($config-or-theme));
  @include mdc-helpers.using-mdc-typography($config) {
    // Card subtitles and titles are an Angular Material construct (not MDC), so we explicitly
    // set their typographic styles here.
    .mat-mdc-card-title {
      @include mdc-typography.typography(headline6);
    }

    .mat-mdc-card-subtitle {
      @include mdc-typography.typography(subtitle2);
    }
  }
}

@mixin density($config-or-theme) {}

@mixin theme($theme-or-color-config) {
  $theme: theming.private-legacy-get-theme($theme-or-color-config);
  @include theming.private-check-duplicate-theme-styles($theme, 'mat-card') {
    $color: theming.get-color-config($theme);
    $density: theming.get-density-config($theme);
    $typography: theming.get-typography-config($theme);

    @if $color != null {
      @include color($color);
    }
    @if $density != null {
      @include density($density);
    }
    @if $typography != null {
      @include typography($typography);
    }
  }
}