fix(material/slide-toggle): change slide-toggle to use MDC's token API (

angular#26966)

src/material/core/tokens/m2/mat/_slide-toggle.scss

@@ -0,0 +1,52 @@
+@use '../../token-utils';
+@use '../../../style/sass-utils';
+@use '../../../typography/typography-utils';
+
+// The prefix used to generate the fully qualified name for tokens in this file.
+$prefix: (mat, slide-toggle);
+
+// Tokens that can't be configured through Angular Material's current theming API,
+// but may be in a future version of the theming API.
+@function get-unthemable-tokens() {
+  @return ();
+}
+
+// Tokens that can be configured through Angular Material's color theming API.
+@function get-color-tokens($config) {
+  @return ();
+}
+
+// Tokens that can be configured through Angular Material's typography theming API.
+@function get-typography-tokens($config) {
+  // TODO(amysorto): The earlier implementation of the slide-toggle used MDC's APIs to create the
+  // typography tokens. As a result, we unintentionally allowed `null` typography configs to be
+  // passed in. Since there a lot of apps that now depend on this pattern, we need this temporary
+  // fallback.
+  @if ($config == null) {
+    $config: mdc-helpers.private-fallback-typography-from-mdc();
+  }
+
+  @return (
+    label-text-font: typography-utils.font-family($config),
+    label-text-size: typography-utils.font-size($config, body-2),
+    label-text-letter-spacing: typography-utils.letter-spacing($config, body-2),
+    label-text-line-height: typography-utils.line-height($config, body-2),
+    label-text-weight: typography-utils.font-weight($config, body-2),
+  );
+ }
+
+// 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)
+  );
+}

src/material/core/tokens/m2/mdc/_switch.scss

@@ -0,0 +1,182 @@
+@use 'sass:map';
+@use '../../../style/elevation';
+@use '../../../style/sass-utils';
+@use '../../../theming/theming';
+@use '../../token-utils';
+
+// The prefix used to generate the fully qualified name for tokens in this file.
+$prefix: (mdc, switch);
+
+// Tokens that can't be configured through Angular Material's current theming API,
+// but may be in a future version of the theming API.
+//
+// Tokens that are available in MDC, but not used in Angular Material should be mapped to `null`.
+// `null` indicates that we are intentionally choosing not to emit a slot or value for the token in
+// our CSS.
+
+@function get-unthemable-tokens() {
+  @return (
+    // Opacity of handle when disabled.
+    disabled-handle-opacity: 0.38,
+    // Opacity of icon when disabled and selected.
+    disabled-selected-icon-opacity: 0.38,
+    // Opacity of track when disabled.
+    disabled-track-opacity: 0.12,
+    // Opacity of icon when disabled and unselected.
+    disabled-unselected-icon-opacity: 0.38,
+    // Height of handle.
+    handle-height: 20px,
+    // Border radius of handle.
+    handle-shape: 10px,
+    // Width of handle.
+    handle-width: 20px,
+    // Width and height of icon when selected.
+    selected-icon-size: 18px,
+    // Height of track.
+    track-height: 14px,
+    // Border radius of track.
+    track-shape: 7px,
+    // Width of track.
+    track-width: 36px,
+    // Width and height of icon when unselected.
+    unselected-icon-size: 18px,
+    // The diameter of the handle ripple.
+    state-layer-size: 40px,
+    // Opacity of ripple when selected and focused.
+    selected-focus-state-layer-opacity: 0.12,
+    // Opacity of ripple when selected and on hover.
+    selected-hover-state-layer-opacity: 0.04,
+    // Opacity of ripple when selected and pressed.
+    selected-pressed-state-layer-opacity: 0.1,
+    // Opacity of ripple when unselected and focused.
+    unselected-focus-state-layer-opacity: 0.12,
+    // Opacity of ripple when unselected and on hover.
+    unselected-hover-state-layer-opacity: 0.04,
+    // Opacity of ripple when unselected and pressed.
+    unselected-pressed-state-layer-opacity: 0.1,
+  );
+}
+
+// Tokens that can be configured through Angular Material's color theming API.
+@function get-color-tokens($config) {
+  $foreground: map.get($config, foreground);
+  $elevation: theming.get-color-from-palette($foreground, elevation);
+  $is-dark: map.get($config, is-dark);
+  $on-surface: if($is-dark, #f5f5f5, #424242);
+  $hairline: if($is-dark, #616161, #e0e0e0);
+  $on-surface-variant: if($is-dark, #9e9e9e, #616161);
+  $on-surface-state-content: if($is-dark, #fafafa, #212121);
+  $disabled-handle-color: if($is-dark, #000, #424242);
+  $icon-color: if($is-dark, #212121, #fff);
+
+  // The default for tokens that rely on the theme will use the primary palette
+  $theme-color-tokens: private-get-color-palette-color-tokens(
+    map.get($config, primary),
+    $is-dark
+  );
+
+  @return map.merge(
+    $theme-color-tokens,
+    (
+      // Color of handle when selected while disabled.
+      disabled-selected-handle-color: $disabled-handle-color,
+      // Color of handle when selected while disabled.
+      disabled-selected-icon-color: $icon-color,
+      // Color of track when selected while disabled.
+      disabled-selected-track-color: $on-surface,
+      // Color of handle when unselected while disabled.
+      disabled-unselected-handle-color: $disabled-handle-color,
+      // Color of icon when unselected while disabled.
+      disabled-unselected-icon-color: $icon-color,
+      // Color of track when disabled.
+      disabled-unselected-track-color: $on-surface,
+      // Color of slide-toggle handle's surface.
+      handle-surface-color: surface,
+      // Elevation level for handle.
+      handle-elevation: 1,
+      // Color of handle's shadow
+      handle-shadow-color: if($elevation != null, $elevation, elevation.$color),
+      // Elevation level for handle when disabled.
+      disabled-handle-elevation: 0,
+      // Color of icon (ex. checkmark) when selected
+      selected-icon-color: $icon-color,
+      // Color of handle when unselected and focused.
+      unselected-focus-handle-color: $on-surface-state-content,
+      // Color of ripple when unselected and focused.
+      unselected-focus-state-layer-color: $on-surface,
+      // Color of track when unselected and focused.
+      unselected-focus-track-color: $hairline,
+      // Color of handle when unselected.
+      unselected-handle-color: $on-surface-variant,
+      // Color of handle when unselected and on hover.
+      unselected-hover-handle-color: $on-surface-state-content,
+      // Color of ripple when unselected and on hover.
+      unselected-hover-state-layer-color: $on-surface,
+      // Color of track when unselected and on hover.
+      unselected-hover-track-color: $hairline,
+      // Color of icon color when unselected.
+      unselected-icon-color: $icon-color,
+      // Color of handle when unselected and pressed.
+      unselected-pressed-handle-color: $on-surface-state-content,
+      // Color of ripple when unselected and pressed.
+      unselected-pressed-state-layer-color: $on-surface,
+      // Color of track when unselected and pressed.
+      unselected-pressed-track-color: $hairline,
+      // Color of track when selected.
+      unselected-track-color: $hairline,
+    )
+  );
+}
+
+// Generates the mapping for the properties that change based on the slide toggle color.
+@function private-get-color-palette-color-tokens($color-palette, $is-dark) {
+  $primary: theming.get-color-from-palette($color-palette, if($is-dark, 300, 600));
+  $state-content: theming.get-color-from-palette($color-palette, if($is-dark, 200, 900));
+  $inverse: theming.get-color-from-palette($color-palette, if($is-dark, 600, 300));
+
+  @return (
+    // Color of ripple when selected and focused.
+    selected-focus-state-layer-color: $primary,
+    // Color of handle when selected
+    selected-handle-color: $primary,
+    // Color of ripple when selected and on hover.
+    selected-hover-state-layer-color: $primary,
+    // Color of ripple when selected and pressed.
+    selected-pressed-state-layer-color: $primary,
+    // Color of handle when selected and focused.
+    selected-focus-handle-color: $state-content,
+    // Color of handle when selected and on hover.
+    selected-hover-handle-color: $state-content,
+    // Color of handle when selected and pressed.
+    selected-pressed-handle-color: $state-content,
+    // Color of track when selected and focused.
+    selected-focus-track-color: $inverse,
+    // Color of track when selected and on hover.
+    selected-hover-track-color: $inverse,
+    /// Color of track when selected and pressed.
+    selected-pressed-track-color: $inverse,
+    // Color of track when selected.
+    selected-track-color: $inverse,
+  );
+}
+
+// Tokens that can be configured through Angular Material's typography theming API.
+@function get-typography-tokens($config) {
+  @return ();
+}
+
+// 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)
+  );
+}

src/material/core/tokens/tests/test-validate-tokens.scss

@@ -10,6 +10,7 @@
 @use '@material/list/list-theme' as mdc-list-theme;
 @use '@material/tooltip/plain-tooltip-theme' as mdc-plaintip-tooltip-theme;
 @use '@material/radio/radio-theme' as mdc-radio-theme;
+@use '@material/switch/switch-theme' as mdc-switch-theme;
 @use '@material/tab-indicator/tab-indicator-theme' as mdc-tab-indicator-theme;
 @use '@material/tab/tab-theme' as mdc-tab-theme;
 @use '@material/snackbar/snackbar-theme' as mdc-snackbar-theme;
@@ -25,6 +26,7 @@
 @use '../m2/mdc/outlined-card' as tokens-mdc-outlined-card;
 @use '../m2/mdc/plain-tooltip' as tokens-mdc-plain-tooltip;
 @use '../m2/mdc/radio' as tokens-mdc-radio;
+@use '../m2/mdc/switch' as tokens-mdc-switch;
 @use '../m2/mdc/tab-indicator' as tokens-mdc-tab-indicator;
 @use '../m2/mdc/tab' as tokens-mdc-tab;
 @use '../m2/mdc/snack-bar' as tokens-mdc-snack-bar;
@@ -87,6 +89,11 @@
   $slots: tokens-mdc-radio.get-token-slots(),
   $reference: mdc-radio-theme.$light-theme
 );
+@include validate-slots(
+  $component: 'm2.mdc.switch',
+  $slots: tokens-mdc-switch.get-token-slots(),
+  $reference: mdc-switch-theme.$light-theme,
+);
 @include validate-slots(
   $component: 'm2.mdc.tab-indicator',
   $slots: tokens-mdc-tab-indicator.get-token-slots(),