feat: add bottom sheet component

* Adds an initial implementation of the new `MatBottomSheet` service that allows users to display component-based or template-based bottom sheets.
* Sets up the various boilerplate and infrastructure necessary for a new component.

Note: this is an initial implementation that has the necessary functionality, styles and accessibility. More docs, examples and touch gestures will be added in a follow-up.

.github/CODEOWNERS

@@ -1,6 +1,7 @@
 # Angular Material components
 /src/lib/*                                         @jelbourn
 /src/lib/autocomplete/**                           @kara @crisbeto
+/src/lib/bottom-sheet/**                           @jelbourn @crisbeto
 /src/lib/button-toggle/**                          @tinayuangao
 /src/lib/button/**                                 @tinayuangao
 /src/lib/card/**                                   @jelbourn

src/demo-app/bottom-sheet/bottom-sheet-demo.html

@@ -0,0 +1,45 @@
+<h1>Bottom sheet demo</h1>
+
+<button mat-raised-button color="primary" (click)="openComponent()">Open component sheet</button>
+<button mat-raised-button color="accent" (click)="openTemplate()">Open template sheet</button>
+
+<mat-card class="demo-dialog-card">
+  <mat-card-content>
+    <h2>Options</h2>
+
+    <p>
+      <mat-checkbox [(ngModel)]="config.hasBackdrop">Has backdrop</mat-checkbox>
+    </p>
+
+    <p>
+      <mat-checkbox [(ngModel)]="config.disableClose">Disable close</mat-checkbox>
+    </p>
+
+    <p>
+      <mat-form-field>
+        <input matInput [(ngModel)]="config.backdropClass" placeholder="Backdrop class">
+      </mat-form-field>
+    </p>
+
+    <p>
+      <mat-form-field>
+        <mat-select placeholder="Direction" [(ngModel)]="config.direction">
+          <mat-option value="ltr">LTR</mat-option>
+          <mat-option value="rtl">RTL</mat-option>
+        </mat-select>
+      </mat-form-field>
+    </p>
+
+  </mat-card-content>
+</mat-card>
+
+
+<ng-template let-bottomSheetRef="bottomSheetRef">
+  <mat-nav-list>
+    <mat-list-item (click)="bottomSheetRef.dismiss()" *ngFor="let action of [1, 2, 3]">
+      <mat-icon mat-list-icon>folder</mat-icon>
+      <span mat-line>Action {{ link }}</span>
+      <span mat-line>Description</span>
+    </mat-list-item>
+  </mat-nav-list>
+</ng-template>

src/demo-app/bottom-sheet/bottom-sheet-demo.scss

@@ -0,0 +1,8 @@
+.demo-dialog-card {
+  max-width: 405px;
+  margin: 20px 0;
+}
+
+.mat-raised-button {
+  margin-right: 5px;
+}

src/demo-app/bottom-sheet/bottom-sheet-demo.ts

@@ -0,0 +1,66 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {Component, ViewEncapsulation, TemplateRef, ViewChild} from '@angular/core';
+import {
+  MatBottomSheet,
+  MatBottomSheetRef,
+  MatBottomSheetConfig,
+} from '@angular/material/bottom-sheet';
+
+const defaultConfig = new MatBottomSheetConfig();
+
+@Component({
+  moduleId: module.id,
+  selector: 'bottom-sheet-demo',
+  styleUrls: ['bottom-sheet-demo.css'],
+  templateUrl: 'bottom-sheet-demo.html',
+  encapsulation: ViewEncapsulation.None,
+  preserveWhitespaces: false,
+})
+export class BottomSheetDemo {
+  config: MatBottomSheetConfig = {
+    hasBackdrop: defaultConfig.hasBackdrop,
+    disableClose: defaultConfig.disableClose,
+    backdropClass: defaultConfig.backdropClass,
+    direction: 'ltr'
+  };
+
+  @ViewChild(TemplateRef) template: TemplateRef<any>;
+
+  constructor(private _bottomSheet: MatBottomSheet) {}
+
+  openComponent() {
+    this._bottomSheet.open(ExampleBottomSheet, this.config);
+  }
+
+  openTemplate() {
+    this._bottomSheet.open(this.template, this.config);
+  }
+}
+
+
+@Component({
+  template: `
+    <mat-nav-list>
+      <a href="#" mat-list-item (click)="handleClick($event)" *ngFor="let action of [1, 2, 3]">
+        <mat-icon mat-list-icon>folder</mat-icon>
+        <span mat-line>Action {{ link }}</span>
+        <span mat-line>Description</span>
+      </a>
+    </mat-nav-list>
+  `
+})
+export class ExampleBottomSheet {
+  constructor(private sheet: MatBottomSheetRef) {}
+
+  handleClick(event: MouseEvent) {
+    event.preventDefault();
+    this.sheet.dismiss();
+  }
+}

src/demo-app/demo-app/demo-app.ts

@@ -51,6 +51,7 @@ export class DemoApp {
   dark = false;
   navItems = [
     {name: 'Autocomplete', route: '/autocomplete'},
+    {name: 'Bottom sheet', route: '/bottom-sheet'},
     {name: 'Button Toggle', route: '/button-toggle'},
     {name: 'Button', route: '/button'},
     {name: 'Card', route: '/card'},

src/demo-app/demo-app/demo-module.ts

@@ -12,6 +12,7 @@ import {NgModule} from '@angular/core';
 import {FormsModule, ReactiveFormsModule} from '@angular/forms';
 import {RouterModule} from '@angular/router';
 import {AutocompleteDemo} from '../autocomplete/autocomplete-demo';
+import {BottomSheetDemo, ExampleBottomSheet} from '../bottom-sheet/bottom-sheet-demo';
 import {BaselineDemo} from '../baseline/baseline-demo';
 import {ButtonToggleDemo} from '../button-toggle/button-toggle-demo';
 import {ButtonDemo} from '../button/button-demo';
@@ -71,6 +72,7 @@ import {TableDemoModule} from '../table/table-demo-module';
   ],
   declarations: [
     AutocompleteDemo,
+    BottomSheetDemo,
     BaselineDemo,
     ButtonDemo,
     ButtonToggleDemo,
@@ -120,6 +122,7 @@ import {TableDemoModule} from '../table/table-demo-module';
     ToolbarDemo,
     TooltipDemo,
     TypographyDemo,
+    ExampleBottomSheet,
   ],
   providers: [
     {provide: OverlayContainer, useClass: FullscreenOverlayContainer},
@@ -133,6 +136,7 @@ import {TableDemoModule} from '../table/table-demo-module';
     RotiniPanel,
     ScienceJoke,
     SpagettiPanel,
+    ExampleBottomSheet,
   ],
 })
 export class DemoModule {}

src/demo-app/demo-app/routes.ts

@@ -10,6 +10,7 @@ import {Routes} from '@angular/router';
 import {AccessibilityDemo} from '../a11y/a11y';
 import {ACCESSIBILITY_DEMO_ROUTES} from '../a11y/routes';
 import {AutocompleteDemo} from '../autocomplete/autocomplete-demo';
+import {BottomSheetDemo} from '../bottom-sheet/bottom-sheet-demo';
 import {BaselineDemo} from '../baseline/baseline-demo';
 import {ButtonToggleDemo} from '../button-toggle/button-toggle-demo';
 import {ButtonDemo} from '../button/button-demo';
@@ -55,6 +56,7 @@ export const DEMO_APP_ROUTES: Routes = [
   {path: '', component: DemoApp, children: [
     {path: '', component: Home},
     {path: 'autocomplete', component: AutocompleteDemo},
+    {path: 'bottom-sheet', component: BottomSheetDemo},
     {path: 'baseline', component: BaselineDemo},
     {path: 'button', component: ButtonDemo},
     {path: 'button-toggle', component: ButtonToggleDemo},

src/demo-app/demo-material-module.ts

@@ -9,6 +9,7 @@
 import {NgModule} from '@angular/core';
 import {
   MatAutocompleteModule,
+  MatBottomSheetModule,
   MatButtonModule,
   MatButtonToggleModule,
   MatCardModule,
@@ -56,6 +57,7 @@ import {PortalModule} from '@angular/cdk/portal';
 @NgModule({
   exports: [
     MatAutocompleteModule,
+    MatBottomSheetModule,
     MatButtonModule,
     MatButtonToggleModule,
     MatCardModule,

src/demo-app/system-config.ts

@@ -59,6 +59,7 @@ System.config({
     '@angular/cdk/table': 'dist/packages/cdk/table/index.js',
 
     '@angular/material/autocomplete': 'dist/packages/material/autocomplete/index.js',
+    '@angular/material/bottom-sheet': 'dist/packages/material/bottom-sheet/index.js',
     '@angular/material/button': 'dist/packages/material/button/index.js',
     '@angular/material/button-toggle': 'dist/packages/material/button-toggle/index.js',
     '@angular/material/card': 'dist/packages/material/card/index.js',

src/e2e-app/system-config.ts

@@ -51,6 +51,7 @@ System.config({
     '@angular/material-examples': 'dist/bundles/material-examples.umd.js',
 
     '@angular/material/autocomplete': 'dist/bundles/material-autocomplete.umd.js',
+    '@angular/material/bottom-sheet': 'dist/bundles/material-bottom-sheet.umd.js',
     '@angular/material/button': 'dist/bundles/material-button.umd.js',
     '@angular/material/button-toggle': 'dist/bundles/material-button-toggle.umd.js',
     '@angular/material/card': 'dist/bundles/material-card.umd.js',

src/lib/bottom-sheet/BUILD.bazel

@@ -0,0 +1,38 @@
+package(default_visibility=["//visibility:public"])
+load("@angular//:index.bzl", "ng_module")
+load("@io_bazel_rules_sass//sass:sass.bzl", "sass_library", "sass_binary")
+
+
+ng_module(
+  name = "bottom-sheet",
+  srcs = glob(["**/*.ts"], exclude=["**/*.spec.ts"]),
+  module_name = "@angular/material/bottom_sheet",
+  assets = [
+    ":bottom_sheet_container_css",
+  ],
+  deps = [
+    "//src/lib/core",
+    "//src/cdk/a11y",
+    "//src/cdk/overlay",
+    "//src/cdk/portal",
+    "//src/cdk/layout",
+    "@rxjs",
+  ],
+  tsconfig = ":tsconfig-build.json",
+)
+
+
+sass_binary(
+  name = "bottom_sheet_container_scss",
+  src = "bottom-sheet-container.scss",
+  deps = ["//src/lib/core:core_scss_lib"],
+)
+
+# TODO(jelbourn): remove this when sass_binary supports specifying an output filename and dir.
+# Copy the output of the sass_binary such that the filename and path match what we expect.
+genrule(
+  name = "bottom_sheet_container_css",
+  srcs = [":bottom_sheet_container_scss"],
+  outs = ["bottom-sheet-container.css"],
+  cmd = "cat $(locations :bottom_sheet_container_scss) > $@",
+)

src/lib/bottom-sheet/README.md

@@ -0,0 +1 @@
+Please see the official documentation at https://material.angular.io/components/component/bottom-sheet

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

@@ -0,0 +1,21 @@
+@import '../core/typography/typography-utils';
+@import '../core/theming/palette';
+
+@mixin mat-bottom-sheet-theme($theme) {
+  $background: map-get($theme, background);
+  $foreground: map-get($theme, foreground);
+
+  .mat-bottom-sheet-container {
+    background: mat-color($background, dialog);
+    color: mat-color($foreground, text);
+  }
+}
+
+@mixin mat-bottom-sheet-typography($config) {
+  .mat-bottom-sheet-container {
+    // Note: we don't use the line-height, because it's way too big.
+    font-family: mat-font-family($config);
+    font-size: mat-font-size($config, subheading-2);
+    font-weight: mat-font-weight($config, subheading-2);
+  }
+}

src/lib/bottom-sheet/bottom-sheet-animations.ts

@@ -0,0 +1,31 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+import {
+  animate,
+  state,
+  style,
+  transition,
+  trigger,
+  AnimationTriggerMetadata,
+} from '@angular/animations';
+import {AnimationCurves, AnimationDurations} from '@angular/material/core';
+
+/** Animations used by the Material bottom sheet. */
+export const matBottomSheetAnimations: {
+  readonly bottomSheetState: AnimationTriggerMetadata;
+} = {
+  /** Animation that shows and hides a bottom sheet. */
+  bottomSheetState: trigger('state', [
+    state('void, hidden', style({transform: 'translateY(100%)'})),
+    state('visible', style({transform: 'translateY(0%)'})),
+    transition('visible => void, visible => hidden',
+        animate(`${AnimationDurations.COMPLEX} ${AnimationCurves.ACCELERATION_CURVE}`)),
+    transition('void => visible',
+        animate(`${AnimationDurations.EXITING} ${AnimationCurves.DECELERATION_CURVE}`)),
+  ])
+};

src/lib/bottom-sheet/bottom-sheet-config.ts

@@ -0,0 +1,42 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {ViewContainerRef, InjectionToken} from '@angular/core';
+import {Direction} from '@angular/cdk/bidi';
+
+/** Injection token that can be used to access the data that was passed in to a bottom sheet. */
+export const MAT_BOTTOM_SHEET_DATA = new InjectionToken<any>('MatBottomSheetData');
+
+/**
+ * Configuration used when opening a bottom sheet.
+ */
+export class MatBottomSheetConfig<D = any> {
+  /** The view container to place the overlay for the bottom sheet into. */
+  viewContainerRef?: ViewContainerRef;
+
+  /** Extra CSS classes to be added to the bottom sheet container. */
+  panelClass?: string | string[];
+
+  /** Text layout direction for the bottom sheet. */
+  direction?: Direction = 'ltr';
+
+  /** Data being injected into the child component. */
+  data?: D | null = null;
+
+  /** Whether the bottom sheet has a backdrop. */
+  hasBackdrop?: boolean = true;
+
+  /** Custom class for the backdrop. */
+  backdropClass?: string;
+
+  /** Whether the user can use escape or clicking outside to close the bottom sheet. */
+  disableClose?: boolean = false;
+
+  /** Aria label to assign to the bottom sheet element. */
+  ariaLabel?: string | null = null;
+}

src/lib/bottom-sheet/bottom-sheet-container.html

@@ -0,0 +1 @@
+<ng-template cdkPortalOutlet></ng-template>

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

@@ -0,0 +1,31 @@
+@import '../core/style/elevation';
+
+// The bottom sheet minimum width on larger screen sizes is based
+// on increments of the toolbar, according to the spec. See:
+// https://material.io/guidelines/components/bottom-sheets.html#bottom-sheets-specs
+$_mat-bottom-sheet-width-increment: 64px;
+$mat-bottom-sheet-container-vertical-padding: 8px !default;
+$mat-bottom-sheet-container-horizontal-padding: 16px !default;
+
+.mat-bottom-sheet-container {
+  @include mat-elevation(16);
+
+  padding: $mat-bottom-sheet-container-vertical-padding
+           $mat-bottom-sheet-container-horizontal-padding;
+  min-width: 100vw;
+  box-sizing: border-box;
+  display: block;
+  outline: 0;
+}
+
+.mat-bottom-sheet-container-medium {
+  min-width: $_mat-bottom-sheet-width-increment * 6;
+}
+
+.mat-bottom-sheet-container-large {
+  min-width: $_mat-bottom-sheet-width-increment * 8;
+}
+
+.mat-bottom-sheet-container-xlarge {
+  min-width: $_mat-bottom-sheet-width-increment * 9;
+}