基于 angular material theming 机制修改 mat-toolbar 的背景色(示例详解)

background: theming.get-color-from-palette($background, app-bar);

$app-bar-background: map-get(mat.$grey-palette, 900);
$background-palette: map-get($theme, background);
$background-palette: map-merge($background-palette, (app-bar: $app-bar-background));
$theme: map-merge($theme, (background: $background-palette));

$background-palette: map-get($theme, background);
background-color: mat.get-color-from-palette($background-palette, app-bar);

@if $accent != null {
    @warn $_legacy-theme-warning;
    @return private-create-backwards-compatibility-theme(_mat-validate-theme((
      _is-legacy-theme: true,
      color: _mat-create-light-color-config($primary, $accent, $warn),
    )));
  }

@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-toolbar') {
    $color: theming.get-color-config($theme);
    $density: theming.get-density-config($theme);
    $typography: theming.get-typography-config($theme);
    // ...
  }
}

$color-palette: map-get($theme, color);
$color-background-palette: map-get($color-palette, background);
$color-background-palette: map-merge($color-background-palette, (app-bar: $app-bar-background));
$color-palette: map-merge($color-palette, (background: $color-background-palette));
$theme: map-merge($theme, (color: $color-palette));