feat(snack-bar): align with 2018 material design spec (#12634)

Aligns the snack bar component with the latest Material Design spec.

Author: crisbeto

src/lib/snack-bar/_snack-bar-theme.scss

@@ -6,8 +6,10 @@
   $accent: map-get($theme, accent);
 
   .mat-snack-bar-container {
+    // Use the primary text on the dark theme, even though the lighter one uses
+    // a secondary, because the contrast on the light primary text is poor.
+    color: if($is-dark-theme, $dark-primary-text, $light-secondary-text);
     background: if($is-dark-theme, map-get($mat-grey, 50), #323232);
-    color: if($is-dark-theme, $dark-primary-text, $light-primary-text);
   }
 
   .mat-simple-snackbar-action {

src/lib/snack-bar/simple-snack-bar.scss

@@ -13,6 +13,8 @@ $mat-snack-bar-button-vertical-margin:
 .mat-simple-snackbar {
   display: flex;
   justify-content: space-between;
+  align-items: center;
+  height: 100%;
   line-height: $mat-snack-bar-line-height;
   opacity: 1;
 }
@@ -22,16 +24,17 @@ $mat-snack-bar-button-vertical-margin:
   flex-direction: column;
   flex-shrink: 0;
   justify-content: space-around;
-  margin: $mat-snack-bar-button-vertical-margin 0
+  margin: $mat-snack-bar-button-vertical-margin $mat-snack-bar-button-horizontal-margin * -1
           $mat-snack-bar-button-vertical-margin $mat-snack-bar-button-horizontal-margin;
 
   button {
     flex: 1;
     max-height: $mat-snack-bar-button-height;
+    min-width: 0;
   }
 
   [dir='rtl'] & {
-    margin-left: 0;
+    margin-left: -$mat-snack-bar-button-horizontal-margin;
     margin-right: $mat-snack-bar-button-horizontal-margin;
   }
 }

src/lib/snack-bar/simple-snack-bar.ts

@@ -9,7 +9,6 @@
 import {Component, ViewEncapsulation, Inject, ChangeDetectionStrategy} from '@angular/core';
 import {MatSnackBarRef} from './snack-bar-ref';
 import {MAT_SNACK_BAR_DATA} from './snack-bar-config';
-import {matSnackBarAnimations} from './snack-bar-animations';
 
 
 /**
@@ -23,15 +22,13 @@ import {matSnackBarAnimations} from './snack-bar-animations';
   styleUrls: ['simple-snack-bar.css'],
   encapsulation: ViewEncapsulation.None,
   changeDetection: ChangeDetectionStrategy.OnPush,
-  animations: [matSnackBarAnimations.contentFade],
   host: {
-    '[@contentFade]': '',
     'class': 'mat-simple-snackbar',
   }
 })
 export class SimpleSnackBar {
   /** Data that was injected into the snack bar. */
-  data: { message: string, action: string };
+  data: {message: string, action: string};
 
   constructor(
     public snackBarRef: MatSnackBarRef<SimpleSnackBar>,

src/lib/snack-bar/snack-bar-animations.ts

@@ -13,27 +13,24 @@ import {
   trigger,
   AnimationTriggerMetadata,
 } from '@angular/animations';
-import {AnimationCurves, AnimationDurations} from '@angular/material/core';
 
 /** Animations used by the Material snack bar. */
 export const matSnackBarAnimations: {
-  readonly contentFade: AnimationTriggerMetadata;
   readonly snackBarState: AnimationTriggerMetadata;
 } = {
-  /** Animation that slides the dialog in and out of view and fades the opacity. */
-  contentFade: trigger('contentFade', [
-    transition(':enter', [
-      style({opacity: '0'}),
-      animate(`${AnimationDurations.COMPLEX} ${AnimationCurves.STANDARD_CURVE}`)
-    ])
-  ]),
-
   /** Animation that shows and hides a snack bar. */
   snackBarState: trigger('state', [
-    state('visible-top, visible-bottom', style({transform: 'translateY(0%)'})),
-    transition('visible-top => hidden-top, visible-bottom => hidden-bottom',
-      animate(`${AnimationDurations.EXITING} ${AnimationCurves.ACCELERATION_CURVE}`)),
-    transition('void => visible-top, void => visible-bottom',
-      animate(`${AnimationDurations.ENTERING} ${AnimationCurves.DECELERATION_CURVE}`)),
+    state('void, hidden', style({
+      transform: 'scale(0.8)',
+      opacity: 0,
+    })),
+    state('visible', style({
+      transform: 'scale(1)',
+      opacity: 1,
+    })),
+    transition('* => visible', animate('150ms cubic-bezier(0, 0, 0.2, 1)')),
+    transition('* => void, * => hidden', animate('75ms cubic-bezier(0.4, 0.0, 1, 1)', style({
+      opacity: 0
+    }))),
   ])
 };

src/lib/snack-bar/snack-bar-container.scss

@@ -1,44 +1,25 @@
 @import '../../cdk/a11y/a11y';
+@import '../core/style/elevation';
 
-$mat-snack-bar-padding: 14px 24px !default;
-$mat-snack-bar-min-width: 288px !default;
-$mat-snack-bar-max-width: 568px !default;
+$mat-snack-bar-padding: 14px 16px !default;
+$mat-snack-bar-min-height: 48px !default;
+$mat-snack-bar-min-width: 344px !default;
+$mat-snack-bar-max-width: 33vw !default;
 $mat-snack-bar-spacing-margin: 24px !default;
+$mat-snack-bar-spacing-margin-handset: 8px !default;
 
 
 .mat-snack-bar-container {
-  border-radius: 2px;
+  @include mat-elevation(6);
+  border-radius: 4px;
   box-sizing: border-box;
   display: block;
   margin: $mat-snack-bar-spacing-margin;
   max-width: $mat-snack-bar-max-width;
   min-width: $mat-snack-bar-min-width;
   padding: $mat-snack-bar-padding;
-  // Initial transformation is applied to start snack bar out of view, below its target position.
-  // Note: it's preferred to use a series of transforms, instead of something like `calc()`, because
-  // IE won't animate transforms that contain a `calc`.
-  transform: translateY(100%) translateY($mat-snack-bar-spacing-margin);
-
-  /**
-   * Removes margin of snack bars which are center positioned horizontally.  This
-   * is done to align snack bars to the edge of the view vertically to match spec.
-   */
-  &.mat-snack-bar-center {
-    margin: 0;
-    transform: translateY(100%);
-  }
-
-  /**
-   * To allow for animations from a 'top' vertical position to animate in a downward
-   * direction, set the translation to start the snack bar above the target position.
-   */
-  &.mat-snack-bar-top {
-    transform: translateY(-100%) translateY(#{-$mat-snack-bar-spacing-margin});
-
-    &.mat-snack-bar-center {
-      transform: translateY(-100%);
-    }
-  }
+  min-height: $mat-snack-bar-min-height;
+  transform-origin: center;
 
   @include cdk-high-contrast {
     border: solid 1px;
@@ -53,8 +34,8 @@ $mat-snack-bar-spacing-margin: 24px !default;
   width: 100%;
 
   .mat-snack-bar-container {
-    margin: 0;
-    max-width: inherit;
+    margin: $mat-snack-bar-spacing-margin-handset;
+    max-width: 100%;
     width: 100%;
   }
 }

src/lib/snack-bar/snack-bar-container.ts

@@ -94,11 +94,11 @@ export class MatSnackBarContainer extends BasePortalOutlet implements OnDestroy
   onAnimationEnd(event: AnimationEvent) {
     const {fromState, toState} = event;
 
-    if ((toState === 'void' && fromState !== 'void') || toState.startsWith('hidden')) {
+    if ((toState === 'void' && fromState !== 'void') || toState === 'hidden') {
       this._completeExit();
     }
 
-    if (toState.startsWith('visible')) {
+    if (toState === 'visible') {
       // Note: we shouldn't use `this` inside the zone callback,
       // because it can cause a memory leak.
       const onEnter = this._onEnter;
@@ -113,14 +113,17 @@ export class MatSnackBarContainer extends BasePortalOutlet implements OnDestroy
   /** Begin animation of snack bar entrance into view. */
   enter(): void {
     if (!this._destroyed) {
-      this._animationState = `visible-${this.snackBarConfig.verticalPosition}`;
+      this._animationState = 'visible';
       this._changeDetectorRef.detectChanges();
     }
   }
 
   /** Begin animation of the snack bar exiting from view. */
   exit(): Observable<void> {
-    this._animationState = `hidden-${this.snackBarConfig.verticalPosition}`;
+    // Note: this one transitions to `hidden`, rather than `void`, in order to handle the case
+    // where multiple snack bars are opened in quick succession (e.g. two consecutive calls to
+    // `MatSnackBar.open`).
+    this._animationState = 'hidden';
     return this._onExit;
   }
 

src/lib/snack-bar/snack-bar.spec.ts

@@ -214,12 +214,12 @@ describe('MatSnackBar', () => {
 
     viewContainerFixture.detectChanges();
     expect(snackBarRef.containerInstance._animationState)
-        .toBe('visible-bottom', `Expected the animation state would be 'visible-bottom'.`);
+        .toBe('visible', `Expected the animation state would be 'visible'.`);
     snackBarRef.dismiss();
 
     viewContainerFixture.detectChanges();
     expect(snackBarRef.containerInstance._animationState)
-        .toBe('hidden-bottom', `Expected the animation state would be 'hidden-bottom'.`);
+        .toBe('hidden', `Expected the animation state would be 'hidden'.`);
   });
 
   it('should set the animation state to complete on exit', () => {
@@ -229,7 +229,7 @@ describe('MatSnackBar', () => {
 
     viewContainerFixture.detectChanges();
     expect(snackBarRef.containerInstance._animationState)
-        .toBe('hidden-bottom', `Expected the animation state would be 'hidden-bottom'.`);
+        .toBe('hidden', `Expected the animation state would be 'hidden'.`);
   });
 
   it(`should set the old snack bar animation state to complete and the new snack bar animation
@@ -240,7 +240,7 @@ describe('MatSnackBar', () => {
 
     viewContainerFixture.detectChanges();
     expect(snackBarRef.containerInstance._animationState)
-        .toBe('visible-bottom', `Expected the animation state would be 'visible-bottom'.`);
+        .toBe('visible', `Expected the animation state would be 'visible'.`);
 
     let config2 = {viewContainerRef: testViewContainerRef};
     let snackBarRef2 = snackBar.open(simpleMessage, undefined, config2);
@@ -251,9 +251,9 @@ describe('MatSnackBar', () => {
 
     expect(dismissCompleteSpy).toHaveBeenCalled();
     expect(snackBarRef.containerInstance._animationState)
-        .toBe('hidden-bottom', `Expected the animation state would be 'hidden-bottom'.`);
+        .toBe('hidden', `Expected the animation state would be 'hidden'.`);
     expect(snackBarRef2.containerInstance._animationState)
-        .toBe('visible-bottom', `Expected the animation state would be 'visible-bottom'.`);
+        .toBe('visible', `Expected the animation state would be 'visible'.`);
   }));
 
   it('should open a new snackbar after dismissing a previous snackbar', fakeAsync(() => {
@@ -273,7 +273,7 @@ describe('MatSnackBar', () => {
     // Wait for the snackbar open animation to finish.
     flush();
     expect(snackBarRef.containerInstance._animationState)
-        .toBe('visible-bottom', `Expected the animation state would be 'visible-bottom'.`);
+        .toBe('visible', `Expected the animation state would be 'visible'.`);
   }));
 
   it('should remove past snackbars when opening new snackbars', fakeAsync(() => {
@@ -452,31 +452,6 @@ describe('MatSnackBar', () => {
         .toContain('custom-class', 'Expected class applied through the defaults to be applied.');
   }));
 
-  it('should position the snack bar correctly if no default position is defined', fakeAsync(() => {
-    overlayContainer.ngOnDestroy();
-    viewContainerFixture.destroy();
-
-    TestBed
-      .resetTestingModule()
-      .overrideProvider(MAT_SNACK_BAR_DEFAULT_OPTIONS, {
-        deps: [],
-        useFactory: () => ({politeness: 'polite'})
-      })
-      .configureTestingModule({imports: [MatSnackBarModule, NoopAnimationsModule]})
-      .compileComponents();
-
-    inject([MatSnackBar, OverlayContainer], (sb: MatSnackBar, oc: OverlayContainer) => {
-      snackBar = sb;
-      overlayContainer = oc;
-      overlayContainerElement = oc.getContainerElement();
-    })();
-
-    const snackBarRef = snackBar.open(simpleMessage);
-    flush();
-
-    expect(snackBarRef.containerInstance._animationState).toBe('visible-bottom');
-  }));
-
   describe('with custom component', () => {
     it('should open a custom component', () => {
       const snackBarRef = snackBar.openFromComponent(BurritosNotification);