fix(material/slider): m3 ripple color (#28369)

* fix(material/slider): m3 ripple color

* fixup! fix(material/slider): m3 ripple color

* fixup! fix(material/slider): m3 ripple color

* fixup! fix(material/slider): m3 ripple color

Author: wagnermaciel

src/material-experimental/theming/_custom-tokens.scss

@@ -508,7 +508,14 @@
 /// @param {Boolean} $exclude-hardcoded Whether to exclude hardcoded token values
 /// @return {Map} A set of custom tokens for the mat-slider
 @function slider($systems, $exclude-hardcoded) {
+  $ripple-color: map.get($systems, md-sys-color, primary);
+  $hover-ripple-color: if($ripple-color == null, null, #{rgba($ripple-color, 0.05)});
+  $focus-ripple-color: if($ripple-color == null, null, #{rgba($ripple-color, 0.2)});
+
   @return (
+    ripple-color: $ripple-color,
+    hover-state-layer-color: $hover-ripple-color,
+    focus-state-layer-color: $focus-ripple-color,
     value-indicator-opacity: _hardcode(1, $exclude-hardcoded),
     value-indicator-padding: _hardcode(0, $exclude-hardcoded),
     value-indicator-width: _hardcode(28px, $exclude-hardcoded),

src/material/core/tokens/m2/mat/_slider.scss

@@ -1,3 +1,4 @@
+@use 'sass:map';
 @use '../../token-utils';
 @use '../../../style/sass-utils';
 @use '../../../theming/inspection';
@@ -21,11 +22,28 @@ $prefix: (mat, slider);
 
 // Tokens that can be configured through Angular Material's color theming API.
 @function get-color-tokens($theme) {
+  $theme-color-tokens: private-get-color-palette-color-tokens($theme, primary);
   $is-dark: inspection.get-theme-type($theme) == dark;
 
+  @return map.merge(
+    $theme-color-tokens,
+    (
+      // Opacity of value indicator text container
+      value-indicator-opacity: if($is-dark, 0.9, 0.6)
+    ),
+  );
+}
+
+// Generates tokens for the slider properties that change based on the theme.
+@function private-get-color-palette-color-tokens($theme, $palette-name) {
+  $ripple-color: inspection.get-theme-color($theme, $palette-name);
+  $hover-ripple-color: if($ripple-color == null, null, #{rgba($ripple-color, 0.05)});
+  $focus-ripple-color: if($ripple-color == null, null, #{rgba($ripple-color, 0.2)});
+
   @return (
-    // Opacity of value indicator text container
-    value-indicator-opacity: if($is-dark, 0.9, 0.6)
+    ripple-color: $ripple-color,
+    hover-state-layer-color: $hover-ripple-color,
+    focus-state-layer-color: $focus-ripple-color
   );
 }
 

src/material/slider/_slider-theme.scss

@@ -40,22 +40,27 @@
   // Add values for MDC slider tokens.
   @include sass-utils.current-selector-or-root() {
     @include mdc-slider-theme.theme($mdc-color-tokens);
-    @include _slider-ripple-color($theme, primary);
     @include token-utils.create-token-values(
       tokens-mat-slider.$prefix,
       $mat-slider-color-tokens
     );
 
     .mat-accent {
+      @include token-utils.create-token-values(
+        tokens-mat-slider.$prefix,
+        tokens-mat-slider.private-get-color-palette-color-tokens($theme, accent),
+      );
       @include mdc-slider-theme.theme(
         tokens-mdc-slider.private-get-color-palette-color-tokens($theme, accent));
-      @include _slider-ripple-color($theme, accent);
     }
 
       .mat-warn {
+        @include token-utils.create-token-values(
+          tokens-mat-slider.$prefix,
+          tokens-mat-slider.private-get-color-palette-color-tokens($theme, warn),
+        );
         @include mdc-slider-theme.theme(
             tokens-mdc-slider.private-get-color-palette-color-tokens($theme, warn));
-        @include _slider-ripple-color($theme, warn);
       }
     }
   }
@@ -105,15 +110,6 @@
   }
 }
 
-// Generated MDC ripple color tokens are not being calculated so needs to be set
-@mixin _slider-ripple-color($theme, $palette-name) {
-  $color: inspection.get-theme-color($theme, $palette-name);
-
-  --mat-mdc-slider-ripple-color: #{$color};
-  --mat-mdc-slider-hover-ripple-color: #{rgba($color, 0.05)};
-  --mat-mdc-slider-focus-ripple-color: #{rgba($color, 0.2)};
-}
-
 @mixin _theme-from-tokens($tokens) {
   @if ($tokens != ()) {
     @include mdc-slider-theme.theme(map.get($tokens, tokens-mdc-slider.$prefix));

src/material/slider/slider.scss

@@ -115,23 +115,23 @@ $mat-slider-horizontal-margin: 8px !default;
         @include token-utils.create-token-slot(width, value-indicator-width);
         @include token-utils.create-token-slot(transform, value-indicator-text-transform);
       }
-    }
 
-    // The `.mat-ripple` wrapper here is redundant, but we need it to
-    // increase the specificity due to how some styles are setup in g3.
-    .mat-ripple {
-      // These ripple colors are custom so we have to introduce our own tokens.
-      .mat-ripple-element {
-        background-color: var(--mat-mdc-slider-ripple-color, transparent);
-      }
+      // The `.mat-ripple` wrapper here is redundant, but we need it to
+      // increase the specificity due to how some styles are setup in g3.
+      .mat-ripple {
+        // These ripple colors are custom so we have to introduce our own tokens.
+        .mat-ripple-element {
+          @include token-utils.create-token-slot(background-color, ripple-color);
+        }
 
-      .mat-mdc-slider-hover-ripple {
-        background-color: var(--mat-mdc-slider-hover-ripple-color, transparent);
-      }
+        .mat-mdc-slider-hover-ripple {
+          @include token-utils.create-token-slot(background-color, hover-state-layer-color);
+        }
 
-      .mat-mdc-slider-focus-ripple,
-      .mat-mdc-slider-active-ripple {
-        background-color: var(--mat-mdc-slider-focus-ripple-color, transparent);
+        .mat-mdc-slider-focus-ripple,
+        .mat-mdc-slider-active-ripple {
+          @include token-utils.create-token-slot(background-color, focus-state-layer-color);
+        }
       }
     }