@angular/flex-layout
Version:
Angular Flex-Layout =======
191 lines • 24 kB
JavaScript
/**
* @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 { Injectable } from '@angular/core';
import { Subject, asapScheduler, of } from 'rxjs';
import { debounceTime, distinctUntilChanged, filter, map, switchMap, takeUntil, } from 'rxjs/operators';
import { mergeAlias } from '../add-alias';
import { MediaChange } from '../media-change';
import { sortDescendingPriority } from '../utils/sort';
import { coerceArray } from '../utils/array';
import * as i0 from "@angular/core";
import * as i1 from "../breakpoints/break-point-registry";
import * as i2 from "../match-media/match-media";
import * as i3 from "../media-marshaller/print-hook";
/**
* MediaObserver enables applications to listen for 1..n mediaQuery activations and to determine
* if a mediaQuery is currently activated.
*
* Since a breakpoint change will first deactivate 1...n mediaQueries and then possibly activate
* 1..n mediaQueries, the MediaObserver will debounce notifications and report ALL *activations*
* in 1 event notification. The reported activations will be sorted in descending priority order.
*
* 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 ''.
*
* Note: Developers should note that only mediaChange activations (not de-activations)
* are announced by the MediaObserver.
*
* @usage
*
* // RxJS
* import { filter } from 'rxjs/operators';
* import { MediaObserver } from '@angular/flex-layout';
*
* @Component({ ... })
* export class AppComponent {
* status: string = '';
*
* constructor(mediaObserver: MediaObserver) {
* const media$ = mediaObserver.asObservable().pipe(
* filter((changes: MediaChange[]) => true) // silly noop filter
* );
*
* media$.subscribe((changes: MediaChange[]) => {
* let status = '';
* changes.forEach( change => {
* status += `'${change.mqAlias}' = (${change.mediaQuery}) <br/>` ;
* });
* this.status = status;
* });
*
* }
* }
*/
export class MediaObserver {
constructor(breakpoints, matchMedia, hook) {
this.breakpoints = breakpoints;
this.matchMedia = matchMedia;
this.hook = hook;
/** Filter MediaChange notifications for overlapping breakpoints */
this.filterOverlaps = false;
this.destroyed$ = new Subject();
this._media$ = this.watchActivations();
}
/**
* Completes the active subject, signalling to all complete for all
* MediaObserver subscribers
*/
ngOnDestroy() {
this.destroyed$.next();
this.destroyed$.complete();
}
// ************************************************
// Public Methods
// ************************************************
/**
* Observe changes to current activation 'list'
*/
asObservable() {
return this._media$;
}
/**
* Allow programmatic query to determine if one or more media query/alias match
* the current viewport size.
* @param value One or more media queries (or aliases) to check.
* @returns Whether any of the media queries match.
*/
isActive(value) {
const aliases = splitQueries(coerceArray(value));
return aliases.some(alias => {
const query = toMediaQuery(alias, this.breakpoints);
return query !== null && this.matchMedia.isActive(query);
});
}
// ************************************************
// Internal Methods
// ************************************************
/**
* Register all the mediaQueries registered in the BreakPointRegistry
* This is needed so subscribers can be auto-notified of all standard, registered
* mediaQuery activations
*/
watchActivations() {
const queries = this.breakpoints.items.map(bp => bp.mediaQuery);
return this.buildObservable(queries);
}
/**
* Only pass/announce activations (not de-activations)
*
* Since multiple-mediaQueries can be activation in a cycle,
* gather all current activations into a single list of changes to observers
*
* Inject associated (if any) alias information into the MediaChange event
* - Exclude mediaQuery activations for overlapping mQs. List bounded mQ ranges only
* - Exclude print activations that do not have an associated mediaQuery
*
* NOTE: the raw MediaChange events [from MatchMedia] do not
* contain important alias information; as such this info
* must be injected into the MediaChange
*/
buildObservable(mqList) {
const hasChanges = (changes) => {
const isValidQuery = (change) => (change.mediaQuery.length > 0);
return (changes.filter(isValidQuery).length > 0);
};
const excludeOverlaps = (changes) => {
return !this.filterOverlaps ? changes : changes.filter(change => {
const bp = this.breakpoints.findByQuery(change.mediaQuery);
return bp?.overlapping ?? true;
});
};
const ignoreDuplicates = (previous, current) => {
if (previous.length !== current.length) {
return false;
}
const previousMqs = previous.map(mc => mc.mediaQuery);
const currentMqs = new Set(current.map(mc => mc.mediaQuery));
const difference = new Set(previousMqs.filter(mq => !currentMqs.has(mq)));
return difference.size === 0;
};
/**
*/
return this.matchMedia
.observe(this.hook.withPrintQuery(mqList))
.pipe(filter((change) => change.matches), debounceTime(0, asapScheduler), switchMap(_ => of(this.findAllActivations())), map(excludeOverlaps), filter(hasChanges), distinctUntilChanged(ignoreDuplicates), takeUntil(this.destroyed$));
}
/**
* Find all current activations and prepare single list of activations
* sorted by descending priority.
*/
findAllActivations() {
const mergeMQAlias = (change) => {
const bp = this.breakpoints.findByQuery(change.mediaQuery);
return mergeAlias(change, bp);
};
const replaceWithPrintAlias = (change) => this.hook.isPrintEvent(change) ? this.hook.updateEvent(change) : change;
return this.matchMedia
.activations
.map(query => new MediaChange(true, query))
.map(replaceWithPrintAlias)
.map(mergeMQAlias)
.sort(sortDescendingPriority);
}
}
MediaObserver.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: MediaObserver, deps: [{ token: i1.BreakPointRegistry }, { token: i2.MatchMedia }, { token: i3.PrintHook }], target: i0.ɵɵFactoryTarget.Injectable });
MediaObserver.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: MediaObserver, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: MediaObserver, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: i1.BreakPointRegistry }, { type: i2.MatchMedia }, { type: i3.PrintHook }]; } });
/**
* Find associated breakpoint (if any)
*/
function toMediaQuery(query, locator) {
const bp = locator.findByAlias(query) ?? locator.findByQuery(query);
return bp?.mediaQuery ?? null;
}
/**
* Split each query string into separate query strings if two queries are provided as comma
* separated.
*/
function splitQueries(queries) {
return queries.flatMap(query => query.split(','))
.map(query => query.trim());
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\nimport {Injectable, OnDestroy} from '@angular/core';\nimport {Subject, asapScheduler, Observable, of} from 'rxjs';\nimport {\n  debounceTime,\n  distinctUntilChanged,\n  filter,\n  map,\n  switchMap,\n  takeUntil,\n} from 'rxjs/operators';\n\nimport {mergeAlias} from '../add-alias';\nimport {MediaChange} from '../media-change';\nimport {MatchMedia} from '../match-media/match-media';\nimport {PrintHook} from '../media-marshaller/print-hook';\nimport {BreakPointRegistry, OptionalBreakPoint} from '../breakpoints/break-point-registry';\n\nimport {sortDescendingPriority} from '../utils/sort';\nimport {coerceArray} from '../utils/array';\n\n\n/**\n * MediaObserver enables applications to listen for 1..n mediaQuery activations and to determine\n * if a mediaQuery is currently activated.\n *\n * Since a breakpoint change will first deactivate 1...n mediaQueries and then possibly activate\n * 1..n mediaQueries, the MediaObserver will debounce notifications and report ALL *activations*\n * in 1 event notification. The reported activations will be sorted in descending priority order.\n *\n * This class uses the BreakPoint Registry to inject alias information into the raw MediaChange\n * notification. For custom mediaQuery notifications, alias information will not be injected and\n * those fields will be ''.\n *\n * Note: Developers should note that only mediaChange activations (not de-activations)\n *       are announced by the MediaObserver.\n *\n *  @usage\n *\n *  // RxJS\n *  import { filter } from 'rxjs/operators';\n *  import { MediaObserver } from '@angular/flex-layout';\n *\n *  @Component({ ... })\n *  export class AppComponent {\n *    status: string = '';\n *\n *    constructor(mediaObserver: MediaObserver) {\n *      const media$ = mediaObserver.asObservable().pipe(\n *        filter((changes: MediaChange[]) => true)   // silly noop filter\n *      );\n *\n *      media$.subscribe((changes: MediaChange[]) => {\n *        let status = '';\n *        changes.forEach( change => {\n *          status += `'${change.mqAlias}' = (${change.mediaQuery}) <br/>` ;\n *        });\n *        this.status = status;\n *     });\n *\n *    }\n *  }\n */\n@Injectable({providedIn: 'root'})\nexport class MediaObserver implements OnDestroy {\n  /** Filter MediaChange notifications for overlapping breakpoints */\n  filterOverlaps = false;\n\n  constructor(protected breakpoints: BreakPointRegistry,\n              protected matchMedia: MatchMedia,\n              protected hook: PrintHook) {\n    this._media$ = this.watchActivations();\n  }\n\n  /**\n   * Completes the active subject, signalling to all complete for all\n   * MediaObserver subscribers\n   */\n  ngOnDestroy(): void {\n    this.destroyed$.next();\n    this.destroyed$.complete();\n  }\n\n  // ************************************************\n  // Public Methods\n  // ************************************************\n\n  /**\n   * Observe changes to current activation 'list'\n   */\n  asObservable(): Observable<MediaChange[]> {\n    return this._media$;\n  }\n\n  /**\n   * Allow programmatic query to determine if one or more media query/alias match\n   * the current viewport size.\n   * @param value One or more media queries (or aliases) to check.\n   * @returns Whether any of the media queries match.\n   */\n  isActive(value: string | string[]): boolean {\n    const aliases = splitQueries(coerceArray(value));\n    return aliases.some(alias => {\n      const query = toMediaQuery(alias, this.breakpoints);\n      return query !== null && this.matchMedia.isActive(query);\n    });\n  }\n\n  // ************************************************\n  // Internal Methods\n  // ************************************************\n\n  /**\n   * Register all the mediaQueries registered in the BreakPointRegistry\n   * This is needed so subscribers can be auto-notified of all standard, registered\n   * mediaQuery activations\n   */\n  private watchActivations() {\n    const queries = this.breakpoints.items.map(bp => bp.mediaQuery);\n    return this.buildObservable(queries);\n  }\n\n  /**\n   * Only pass/announce activations (not de-activations)\n   *\n   * Since multiple-mediaQueries can be activation in a cycle,\n   * gather all current activations into a single list of changes to observers\n   *\n   * Inject associated (if any) alias information into the MediaChange event\n   * - Exclude mediaQuery activations for overlapping mQs. List bounded mQ ranges only\n   * - Exclude print activations that do not have an associated mediaQuery\n   *\n   * NOTE: the raw MediaChange events [from MatchMedia] do not\n   *       contain important alias information; as such this info\n   *       must be injected into the MediaChange\n   */\n  private buildObservable(mqList: string[]): Observable<MediaChange[]> {\n    const hasChanges = (changes: MediaChange[]) => {\n      const isValidQuery = (change: MediaChange) => (change.mediaQuery.length > 0);\n      return (changes.filter(isValidQuery).length > 0);\n    };\n    const excludeOverlaps = (changes: MediaChange[]) => {\n      return !this.filterOverlaps ? changes : changes.filter(change => {\n        const bp = this.breakpoints.findByQuery(change.mediaQuery);\n        return bp?.overlapping ?? true;\n      });\n    };\n    const ignoreDuplicates = (previous: MediaChange[], current: MediaChange[]): boolean => {\n      if (previous.length !== current.length) {\n        return false;\n      }\n\n      const previousMqs = previous.map(mc => mc.mediaQuery);\n      const currentMqs = new Set(current.map(mc => mc.mediaQuery));\n      const difference = new Set(previousMqs.filter(mq => !currentMqs.has(mq)));\n\n      return difference.size === 0;\n    };\n\n    /**\n     */\n    return this.matchMedia\n        .observe(this.hook.withPrintQuery(mqList))\n        .pipe(\n            filter((change: MediaChange) => change.matches),\n            debounceTime(0, asapScheduler),\n            switchMap(_ => of(this.findAllActivations())),\n            map(excludeOverlaps),\n            filter(hasChanges),\n            distinctUntilChanged(ignoreDuplicates),\n            takeUntil(this.destroyed$)\n        );\n  }\n\n  /**\n   * Find all current activations and prepare single list of activations\n   * sorted by descending priority.\n   */\n  private findAllActivations(): MediaChange[] {\n    const mergeMQAlias = (change: MediaChange) => {\n      const bp: OptionalBreakPoint = this.breakpoints.findByQuery(change.mediaQuery);\n      return mergeAlias(change, bp);\n    };\n    const replaceWithPrintAlias = (change: MediaChange) =>\n      this.hook.isPrintEvent(change) ? this.hook.updateEvent(change) : change;\n\n    return this.matchMedia\n        .activations\n        .map(query => new MediaChange(true, query))\n        .map(replaceWithPrintAlias)\n        .map(mergeMQAlias)\n        .sort(sortDescendingPriority);\n  }\n\n  private readonly _media$: Observable<MediaChange[]>;\n  private readonly destroyed$ = new Subject<void>();\n}\n\n/**\n * Find associated breakpoint (if any)\n */\nfunction toMediaQuery(query: string, locator: BreakPointRegistry): string | null {\n  const bp = locator.findByAlias(query) ?? locator.findByQuery(query);\n  return bp?.mediaQuery ?? null;\n}\n\n/**\n * Split each query string into separate query strings if two queries are provided as comma\n * separated.\n */\nfunction splitQueries(queries: string[]): string[] {\n  return queries.flatMap(query => query.split(','))\n    .map(query => query.trim());\n}\n"]}