refactor(material/bottom-sheet): switch to token API (#27471)

Switches the bottom sheet to use the tokens theming API.

Author: crisbeto

src/material/bottom-sheet/BUILD.bazel

@@ -46,7 +46,10 @@ sass_library(
 sass_binary(
     name = "bottom_sheet_container_scss",
     src = "bottom-sheet-container.scss",
-    deps = ["//src/cdk:sass_lib"],
+    deps = [
+        "//src/cdk:sass_lib",
+        "//src/material/core:core_scss_lib",
+    ],
 )
 
 ng_test_library(

src/material/bottom-sheet/_bottom-sheet-theme.scss

@@ -1,26 +1,25 @@
-@use 'sass:map';
-@use '../core/style/private';
 @use '../core/typography/typography';
-@use '../core/typography/typography-utils';
 @use '../core/theming/theming';
+@use '../core/style/sass-utils';
+@use '../core/tokens/token-utils';
+@use '../core/tokens/m2/mat/bottom-sheet' as tokens-mat-bottom-sheet;
 
 @mixin color($config-or-theme) {
   $config: theming.get-color-config($config-or-theme);
-  $background: map.get($config, background);
-  $foreground: map.get($config, foreground);
 
-  .mat-bottom-sheet-container {
-    @include private.private-theme-elevation(16, $config);
-    background: theming.get-color-from-palette($background, dialog);
-    color: theming.get-color-from-palette($foreground, text);
+  @include sass-utils.current-selector-or-root() {
+    @include token-utils.create-token-values(tokens-mat-bottom-sheet.$prefix,
+      tokens-mat-bottom-sheet.get-color-tokens($config));
   }
 }
 
 @mixin typography($config-or-theme) {
   $config: typography.private-typography-to-2014-config(
       theming.get-typography-config($config-or-theme));
-  .mat-bottom-sheet-container {
-    @include typography-utils.typography-level($config, body-1);
+
+  @include sass-utils.current-selector-or-root() {
+    @include token-utils.create-token-values(tokens-mat-bottom-sheet.$prefix,
+      tokens-mat-bottom-sheet.get-typography-tokens($config));
   }
 }
 

src/material/bottom-sheet/bottom-sheet-container.scss

@@ -1,4 +1,7 @@
 @use '@angular/cdk';
+@use '../core/style/elevation';
+@use '../core/tokens/m2/mat/bottom-sheet' as tokens-mat-bottom-sheet;
+@use '../core/tokens/token-utils';
 
 // The bottom sheet minimum width on larger screen sizes is based
 // on increments of the toolbar, according to the spec. See:
@@ -8,6 +11,9 @@ $container-vertical-padding: 8px !default;
 $container-horizontal-padding: 16px !default;
 
 .mat-bottom-sheet-container {
+  @include token-utils.create-token-values(
+    tokens-mat-bottom-sheet.$prefix, tokens-mat-bottom-sheet.get-unthemable-tokens());
+  @include elevation.elevation(16);
   padding: $container-vertical-padding
            $container-horizontal-padding;
   min-width: 100vw;
@@ -17,15 +23,29 @@ $container-horizontal-padding: 16px !default;
   max-height: 80vh;
   overflow: auto;
 
+  @include token-utils.use-tokens(
+    tokens-mat-bottom-sheet.$prefix, tokens-mat-bottom-sheet.get-token-slots()) {
+    @include token-utils.create-token-slot(background, container-background-color);
+    @include token-utils.create-token-slot(color, container-text-color);
+    @include token-utils.create-token-slot(font-family, container-text-font);
+    @include token-utils.create-token-slot(font-size, container-text-size);
+    @include token-utils.create-token-slot(line-height, container-text-line-height);
+    @include token-utils.create-token-slot(font-weight, container-text-weight);
+    @include token-utils.create-token-slot(letter-spacing, container-text-tracking);
+  }
+
   @include cdk.high-contrast(active, off) {
     outline: 1px solid;
   }
 }
 
 // Applies a border radius to the bottom sheet. Should only be applied when it's not full-screen.
 %_mat-bottom-sheet-container-border-radius {
-  border-top-left-radius: 4px;
-  border-top-right-radius: 4px;
+  @include token-utils.use-tokens(
+    tokens-mat-bottom-sheet.$prefix, tokens-mat-bottom-sheet.get-token-slots()) {
+    @include token-utils.create-token-slot(border-top-left-radius, container-shape);
+    @include token-utils.create-token-slot(border-top-right-radius, container-shape);
+  }
 }
 
 .mat-bottom-sheet-container-medium {

src/material/core/tokens/m2/mat/_bottom-sheet.scss

@@ -0,0 +1,56 @@
+@use 'sass:map';
+@use '../../token-utils';
+@use '../../../typography/typography-utils';
+@use '../../../theming/theming';
+@use '../../../style/sass-utils';
+
+// The prefix used to generate the fully qualified name for tokens in this file.
+$prefix: (mat, bottom-sheet);
+
+// Tokens that can't be configured through Angular Material's current theming API,
+// but may be in a future version of the theming API.
+@function get-unthemable-tokens() {
+  @return (
+    // TODO: will be necessary for M3.
+    container-shape: 4px,
+  );
+}
+
+// Tokens that can be configured through Angular Material's color theming API.
+@function get-color-tokens($config) {
+  $foreground: map.get($config, foreground);
+  $background: map.get($config, background);
+
+  @return (
+    container-text-color: theming.get-color-from-palette($foreground, text),
+    container-background-color: theming.get-color-from-palette($background, dialog),
+  );
+}
+
+// Tokens that can be configured through Angular Material's typography theming API.
+@function get-typography-tokens($config) {
+  @return (
+    container-text-font: typography-utils.font-family($config, body-1) or
+      typography-utils.font-family($config),
+    container-text-line-height: typography-utils.line-height($config, body-1),
+    container-text-size: typography-utils.font-size($config, body-1),
+    container-text-tracking: typography-utils.letter-spacing($config, body-1),
+    container-text-weight: typography-utils.font-weight($config, body-1),
+  );
+}
+
+// Tokens that can be configured through Angular Material's density theming API.
+@function get-density-tokens($config) {
+  @return ();
+}
+
+// Combines the tokens generated by the above functions into a single map with placeholder values.
+// This is used to create token slots.
+@function get-token-slots() {
+  @return sass-utils.deep-merge-all(
+      get-unthemable-tokens(),
+      get-color-tokens(token-utils.$placeholder-color-config),
+      get-typography-tokens(token-utils.$placeholder-typography-config),
+      get-density-tokens(token-utils.$placeholder-density-config)
+  );
+}