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fix(matchMediaObservable): expose observable for rxjs operators
* rename token to 'ObservableMediaService' * rename MatchMediaObservableProvider to ObservableMediaServiceProvider * add method `.asObservable()` to MediaService fixes #125.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| /** | ||
| * @license | ||
| * Copyright Google Inc. 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 | ||
| */ | ||
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| import {OpaqueToken} from '@angular/core'; // tslint:disable-line:no-unused-variable | ||
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| import {Subscription} from 'rxjs/Subscription'; | ||
| import {Observable, Subscribable} from "rxjs/Observable"; | ||
| import 'rxjs/add/operator/map'; | ||
| import 'rxjs/add/operator/filter'; | ||
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| import {BreakPointRegistry} from './breakpoints/break-point-registry'; | ||
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| import {MediaChange} from './media-change'; | ||
| import {MatchMedia} from './match-media'; | ||
| import {mergeAlias} from './../utils/add-alias'; | ||
| import {BreakPoint} from './breakpoints/break-point'; | ||
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| /** | ||
| * Opaque Token unique to the flex-layout library. | ||
| * Note: Developers must use this token when building their own custom | ||
| * `ObservableMediaServiceProvider` provider. | ||
| * | ||
| * @see ./providers/match-media-observable-provider.ts | ||
| */ | ||
| // tslint:disable-next-line:variable-name | ||
| export const ObservableMediaService: OpaqueToken = new OpaqueToken('flex-layout-media-service'); | ||
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| /** | ||
| * Class internalizes a MatchMedia service and exposes an Subscribable and Observable interface. | ||
| * This an Observable with that exposes a feature to subscribe to mediaQuery | ||
| * changes and a validator method (`isActive(<alias>)`) to test if a mediaQuery (or alias) is | ||
| * currently active. | ||
| * | ||
| * !! Only mediaChange activations (not de-activations) are announced by the ObservableMediaService | ||
| * | ||
| * This class uses the BreakPoint Registry to inject alias information into the raw MediaChange | ||
| * notification. For custom mediaQuery notifications, alias information will not be injected and | ||
| * those fields will be ''. | ||
| * | ||
| * !! This is not an actual Observable. It is a wrapper of an Observable used to publish additional | ||
| * methods like `isActive(<alias>). To access the Observable and use RxJS operators, use | ||
| * `.asObservable()` with syntax like media.asObservable().map(....). | ||
| * | ||
| */ | ||
| export class MediaService implements Subscribable<MediaChange> { | ||
| private observable$: Observable<MediaChange>; | ||
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| constructor(private mediaWatcher: MatchMedia, | ||
| private breakpoints: BreakPointRegistry) { | ||
| this._registerBreakPoints(); | ||
| this.observable$ = this._buildObservable(); | ||
| } | ||
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| /** | ||
| * Test if specified query/alias is active. | ||
| */ | ||
| isActive(alias): boolean { | ||
| let query = this._toMediaQuery(alias); | ||
| return this.mediaWatcher.isActive(query); | ||
| }; | ||
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| /** | ||
| * Proxy to the Observable subscribe method | ||
| */ | ||
| subscribe(next?: (value: MediaChange) => void, | ||
| error?: (error: any) => void, | ||
| complete?: () => void): Subscription { | ||
| return this.observable$.subscribe(next, error, complete); | ||
| }; | ||
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| /** | ||
| * Access to observable for use with operators like | ||
| * .filter(), .map(), etc. | ||
| */ | ||
| asObservable(): Observable<MediaChange> { | ||
| return this.observable$; | ||
| } | ||
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| // ************************************************ | ||
| // Internal Methods | ||
| // ************************************************ | ||
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| /** | ||
| * Register all the mediaQueries registered in the BreakPointRegistry | ||
| * This is needed so subscribers can be auto-notified of all standard, registered | ||
| * mediaQuery activations | ||
| */ | ||
| private _registerBreakPoints() { | ||
| this.breakpoints.items.forEach((bp: BreakPoint) => { | ||
| this.mediaWatcher.registerQuery(bp.mediaQuery); | ||
| return bp; | ||
| }); | ||
| } | ||
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| /** | ||
| * Prepare internal observable | ||
| * NOTE: the raw MediaChange events [from MatchMedia] do not contain important alias information | ||
| * these must be injected into the MediaChange | ||
| */ | ||
| private _buildObservable() { | ||
| return this.mediaWatcher.observe() | ||
| .filter((change: MediaChange) => { | ||
| // Only pass/announce activations (not de-activations) | ||
| return change.matches === true; | ||
| }) | ||
| .map((change: MediaChange) => { | ||
| // Inject associated (if any) alias information into the MediaChange event | ||
| return mergeAlias(change, this._findByQuery(change.mediaQuery)); | ||
| }); | ||
| } | ||
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| /** | ||
| * Breakpoint locator by alias | ||
| */ | ||
| private _findByAlias(alias) { | ||
| return this.breakpoints.findByAlias(alias); | ||
| }; | ||
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| /** | ||
| * Breakpoint locator by mediaQuery | ||
| */ | ||
| private _findByQuery(query) { | ||
| return this.breakpoints.findByQuery(query); | ||
| }; | ||
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| /** | ||
| * Find associated breakpoint (if any) | ||
| */ | ||
| private _toMediaQuery(query) { | ||
| let bp: BreakPoint = this._findByAlias(query) || this._findByQuery(query); | ||
| return bp ? bp.mediaQuery : query; | ||
| }; | ||
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| } |
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