From 1d8379ae1a3c1b06082e163de68404bd28dd19e4 Mon Sep 17 00:00:00 2001
From: Kristiyan Kostadinov <crisbeto@users.noreply.github.com>
Date: Mon, 17 Jul 2023 20:35:09 +0200
Subject: [PATCH] refactor(material/sidenav): switch to tokens API (#27468)

Reworks the sidenav to use the new tokens theming API.
---
 src/material/core/tokens/m2/mat/_sidenav.scss | 65 +++++++++++++
 src/material/sidenav/_sidenav-theme.scss      | 75 ++-------------
 src/material/sidenav/drawer.scss              | 91 +++++++++++++++++--
 3 files changed, 156 insertions(+), 75 deletions(-)
 create mode 100644 src/material/core/tokens/m2/mat/_sidenav.scss

diff --git a/src/material/core/tokens/m2/mat/_sidenav.scss b/src/material/core/tokens/m2/mat/_sidenav.scss
new file mode 100644
index 000000000000..a17dfa6c7873
--- /dev/null
+++ b/src/material/core/tokens/m2/mat/_sidenav.scss
@@ -0,0 +1,65 @@
+@use 'sass:color';
+@use 'sass:map';
+@use 'sass:meta';
+@use '../../token-utils';
+@use '../../../theming/theming';
+@use '../../../style/sass-utils';
+
+// The prefix used to generate the fully qualified name for tokens in this file.
+$prefix: (mat, sidenav);
+
+// Tokens that can't be configured through Angular Material's current theming API,
+// but may be in a future version of the theming API.
+@function get-unthemable-tokens() {
+  @return (
+    // Currently zero, but it appears to be relevant for M3.
+    // See: https://m3.material.io/components/navigation-drawer/overview
+    container-shape: 0,
+  );
+}
+
+// Tokens that can be configured through Angular Material's color theming API.
+@function get-color-tokens($config) {
+  $is-dark: map.get($config, is-dark);
+  $foreground: map.get($config, foreground);
+  $background: map.get($config, background);
+  $scrim-opacity: 0.6;
+  $scrim-color: theming.get-color-from-palette($background, card, $scrim-opacity);
+  $fallback-scrim-color: if($is-dark, rgba(#fff, $scrim-opacity), rgba(#000, $scrim-opacity));
+
+  @return (
+    container-divider-color: theming.get-color-from-palette($foreground, divider),
+    container-background-color: theming.get-color-from-palette($background, dialog),
+    container-text-color: theming.get-color-from-palette($foreground, text),
+    content-background-color: theming.get-color-from-palette($background, background),
+    content-text-color: theming.get-color-from-palette($foreground, text),
+
+    // We use invert() here to have the darken the background color expected to be used.
+    // If the background is light, we use a dark backdrop. If the background is dark, we
+    // use a light backdrop. If the value isn't a color, Sass will throw an error so we
+    // fall back to something generic.
+    scrim-color: if(meta.type-of($scrim-color) == color,
+      color.invert($scrim-color), $fallback-scrim-color),
+  );
+}
+
+// Tokens that can be configured through Angular Material's typography theming API.
+@function get-typography-tokens($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)
+  );
+}
diff --git a/src/material/sidenav/_sidenav-theme.scss b/src/material/sidenav/_sidenav-theme.scss
index 2d023548cef3..70407e8a8e63 100644
--- a/src/material/sidenav/_sidenav-theme.scss
+++ b/src/material/sidenav/_sidenav-theme.scss
@@ -1,77 +1,14 @@
-@use 'sass:color';
-@use 'sass:map';
-@use 'sass:meta';
-@use '../core/style/private';
 @use '../core/theming/theming';
+@use '../core/tokens/m2/mat/sidenav' as tokens-mat-sidenav;
+@use '../core/tokens/token-utils';
+@use '../core/style/sass-utils';
 
 @mixin color($config-or-theme) {
   $config: theming.get-color-config($config-or-theme);
-  $primary: map.get($config, primary);
-  $accent: map.get($config, accent);
-  $warn: map.get($config, warn);
-  $background: map.get($config, background);
-  $foreground: map.get($config, foreground);
 
-  $drawer-background-color: theming.get-color-from-palette($background, dialog);
-  $drawer-container-background-color:  theming.get-color-from-palette($background, background);
-  $drawer-push-background-color: theming.get-color-from-palette($background, dialog);
-  $drawer-side-border: solid 1px theming.get-color-from-palette($foreground, divider);
-
-  .mat-drawer-container {
-    background-color: $drawer-container-background-color;
-    color: theming.get-color-from-palette($foreground, text);
-  }
-
-  .mat-drawer {
-    background-color: $drawer-background-color;
-    color: theming.get-color-from-palette($foreground, text);
-
-    &.mat-drawer-push {
-      background-color: $drawer-push-background-color;
-    }
-
-    &:not(.mat-drawer-side) {
-      // The elevation of z-16 is noted in the design specifications.
-      // See https://material.io/design/components/navigation-drawer.html
-      @include private.private-theme-elevation(16, $config);
-    }
-  }
-
-  .mat-drawer-side {
-    border-right: $drawer-side-border;
-
-    &.mat-drawer-end {
-      border-left: $drawer-side-border;
-      border-right: none;
-    }
-  }
-
-  [dir='rtl'] .mat-drawer-side {
-    border-left: $drawer-side-border;
-    border-right: none;
-
-    &.mat-drawer-end {
-      border-left: none;
-      border-right: $drawer-side-border;
-    }
-  }
-
-  .mat-drawer-backdrop.mat-drawer-shown {
-    $opacity: 0.6;
-    $backdrop-color: theming.get-color-from-palette($background, card, $opacity);
-
-    @if (meta.type-of($backdrop-color) == color) {
-      // We use invert() here to have the darken the background color expected to be used. If the
-      // background is light, we use a dark backdrop. If the background is dark,
-      // we use a light backdrop.
-      background-color: color.invert($backdrop-color);
-    }
-    @else {
-      // If we couldn't resolve the backdrop color to a color value, fall back to using
-      // `opacity` to make it opaque since its end value could be a solid color.
-      background-color: $backdrop-color;
-      opacity: $opacity;
-    }
+  @include sass-utils.current-selector-or-root() {
+    @include token-utils.create-token-values(tokens-mat-sidenav.$prefix,
+      tokens-mat-sidenav.get-color-tokens($config));
   }
 }
 
diff --git a/src/material/sidenav/drawer.scss b/src/material/sidenav/drawer.scss
index 1f4dd7d3e7da..794dbcc37854 100644
--- a/src/material/sidenav/drawer.scss
+++ b/src/material/sidenav/drawer.scss
@@ -1,7 +1,10 @@
 @use '@angular/cdk';
 
+@use '../core/tokens/m2/mat/sidenav' as tokens-mat-sidenav;
+@use '../core/tokens/token-utils';
 @use '../core/style/variables';
 @use '../core/style/layout-common';
+@use '../core/style/elevation';
 
 $drawer-content-z-index: 1;
 $drawer-side-drawer-z-index: 2;
@@ -25,6 +28,12 @@ $drawer-over-drawer-z-index: 4;
   // the application content does not get messed up with our own CSS.
   @include drawer-stacking-context();
 
+  @include token-utils.use-tokens(
+    tokens-mat-sidenav.$prefix, tokens-mat-sidenav.get-token-slots()) {
+    @include token-utils.create-token-slot(color, content-text-color);
+    @include token-utils.create-token-slot(background-color, content-background-color);
+  }
+
   box-sizing: border-box;
   -webkit-overflow-scrolling: touch;
 
@@ -74,6 +83,11 @@ $drawer-over-drawer-z-index: 4;
 
   &.mat-drawer-shown {
     visibility: visible;
+
+    @include token-utils.use-tokens(
+      tokens-mat-sidenav.$prefix, tokens-mat-sidenav.get-token-slots()) {
+      @include token-utils.create-token-slot(background-color, scrim-color);
+    }
   }
 
   .mat-drawer-transition & {
@@ -108,7 +122,20 @@ $drawer-over-drawer-z-index: 4;
 .mat-drawer {
   $high-contrast-border: solid 1px currentColor;
 
+  // The elevation of z-16 is noted in the design specifications.
+  // See https://material.io/design/components/navigation-drawer.html
+  @include elevation.elevation(16);
   @include drawer-stacking-context($drawer-over-drawer-z-index);
+  @include token-utils.create-token-values(
+    tokens-mat-sidenav.$prefix, tokens-mat-sidenav.get-unthemable-tokens());
+
+  @include token-utils.use-tokens(
+    tokens-mat-sidenav.$prefix, tokens-mat-sidenav.get-token-slots()) {
+    @include token-utils.create-token-slot(color, container-text-color);
+    @include token-utils.create-token-slot(background-color, container-background-color);
+    @include token-utils.create-token-slot(border-top-right-radius, container-shape);
+    @include token-utils.create-token-slot(border-bottom-right-radius, container-shape);
+  }
 
   display: block;
   position: absolute;
@@ -120,6 +147,7 @@ $drawer-over-drawer-z-index: 4;
   overflow-y: auto; // TODO(kara): revisit scrolling behavior for drawers
   transform: translate3d(-100%, 0, 0);
 
+
   &, [dir='rtl'] &.mat-drawer-end {
     @include cdk.high-contrast(active, off) {
       border-right: $high-contrast-border;
@@ -140,15 +168,34 @@ $drawer-over-drawer-z-index: 4;
   &.mat-drawer-end {
     right: 0;
     transform: translate3d(100%, 0, 0);
+
+    @include token-utils.use-tokens(
+      tokens-mat-sidenav.$prefix, tokens-mat-sidenav.get-token-slots()) {
+      @include token-utils.create-token-slot(border-top-left-radius, container-shape);
+      @include token-utils.create-token-slot(border-bottom-left-radius, container-shape);
+      border-top-right-radius: 0;
+      border-bottom-right-radius: 0;
+    }
   }
 
   [dir='rtl'] & {
-    transform: translate3d(100%, 0, 0);
-
-    &.mat-drawer-end {
-      left: 0;
-      right: auto;
-      transform: translate3d(-100%, 0, 0);
+    @include token-utils.use-tokens(
+      tokens-mat-sidenav.$prefix, tokens-mat-sidenav.get-token-slots()) {
+      @include token-utils.create-token-slot(border-top-left-radius, container-shape);
+      @include token-utils.create-token-slot(border-bottom-left-radius, container-shape);
+      border-top-right-radius: 0;
+      border-bottom-right-radius: 0;
+      transform: translate3d(100%, 0, 0);
+
+      &.mat-drawer-end {
+        @include token-utils.create-token-slot(border-top-right-radius, container-shape);
+        @include token-utils.create-token-slot(border-bottom-right-radius, container-shape);
+        border-top-left-radius: 0;
+        border-bottom-left-radius: 0;
+        left: 0;
+        right: auto;
+        transform: translate3d(-100%, 0, 0);
+      }
     }
   }
 
@@ -164,6 +211,38 @@ $drawer-over-drawer-z-index: 4;
   }
 }
 
+.mat-drawer-side {
+  box-shadow: none;
+
+  @include token-utils.use-tokens(
+    tokens-mat-sidenav.$prefix, tokens-mat-sidenav.get-token-slots()) {
+    @include token-utils.create-token-slot(border-right-color, container-divider-color);
+    border-right-width: 1px;
+    border-right-style: solid;
+
+    &.mat-drawer-end {
+      @include token-utils.create-token-slot(border-left-color, container-divider-color);
+      border-left-width: 1px;
+      border-left-style: solid;
+      border-right: none;
+    }
+
+    [dir='rtl'] & {
+      @include token-utils.create-token-slot(border-left-color, container-divider-color);
+      border-left-width: 1px;
+      border-left-style: solid;
+      border-right: none; // Clears the default LTR border.
+
+      &.mat-drawer-end {
+        @include token-utils.create-token-slot(border-right-color, container-divider-color);
+        border-right-width: 1px;
+        border-right-style: solid;
+        border-left: none;
+      }
+    }
+  }
+}
+
 // Note that this div isn't strictly necessary on all browsers, however we need it in
 // order to avoid a layout issue in Chrome. The issue is that in RTL mode the browser doesn't
 // account for the sidenav's scrollbar while positioning, which ends up pushing it partially