@angular/flex-layout
Version:
Angular Flex-Layout =======
182 lines • 23.1 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 { Inject, Injectable, PLATFORM_ID } from '@angular/core';
import { DOCUMENT, isPlatformBrowser } from '@angular/common';
import { BehaviorSubject, Observable, merge } from 'rxjs';
import { filter } from 'rxjs/operators';
import { MediaChange } from '../media-change';
import * as i0 from "@angular/core";
/**
* MediaMonitor configures listeners to mediaQuery changes and publishes an Observable facade to
* convert mediaQuery change callbacks to subscriber notifications. These notifications will be
* performed within the ng Zone to trigger change detections and component updates.
*
* NOTE: both mediaQuery activations and de-activations are announced in notifications
*/
export class MatchMedia {
constructor(_zone, _platformId, _document) {
this._zone = _zone;
this._platformId = _platformId;
this._document = _document;
/** Initialize source with 'all' so all non-responsive APIs trigger style updates */
this.source = new BehaviorSubject(new MediaChange(true));
this.registry = new Map();
this.pendingRemoveListenerFns = [];
this._observable$ = this.source.asObservable();
}
/**
* Publish list of all current activations
*/
get activations() {
const results = [];
this.registry.forEach((mql, key) => {
if (mql.matches) {
results.push(key);
}
});
return results;
}
/**
* For the specified mediaQuery?
*/
isActive(mediaQuery) {
const mql = this.registry.get(mediaQuery);
return mql?.matches ?? this.registerQuery(mediaQuery).some(m => m.matches);
}
/**
* External observers can watch for all (or a specific) mql changes.
* Typically used by the MediaQueryAdaptor; optionally available to components
* who wish to use the MediaMonitor as mediaMonitor$ observable service.
*
* Use deferred registration process to register breakpoints only on subscription
* This logic also enforces logic to register all mediaQueries BEFORE notify
* subscribers of notifications.
*/
observe(mqList, filterOthers = false) {
if (mqList && mqList.length) {
const matchMedia$ = this._observable$.pipe(filter((change) => !filterOthers ? true : (mqList.indexOf(change.mediaQuery) > -1)));
const registration$ = new Observable((observer) => {
const matches = this.registerQuery(mqList);
if (matches.length) {
const lastChange = matches.pop();
matches.forEach((e) => {
observer.next(e);
});
this.source.next(lastChange); // last match is cached
}
observer.complete();
});
return merge(registration$, matchMedia$);
}
return this._observable$;
}
/**
* Based on the BreakPointRegistry provider, register internal listeners for each unique
* mediaQuery. Each listener emits specific MediaChange data to observers
*/
registerQuery(mediaQuery) {
const list = Array.isArray(mediaQuery) ? mediaQuery : [mediaQuery];
const matches = [];
buildQueryCss(list, this._document);
list.forEach((query) => {
const onMQLEvent = (e) => {
this._zone.run(() => this.source.next(new MediaChange(e.matches, query)));
};
let mql = this.registry.get(query);
if (!mql) {
mql = this.buildMQL(query);
mql.addListener(onMQLEvent);
this.pendingRemoveListenerFns.push(() => mql.removeListener(onMQLEvent));
this.registry.set(query, mql);
}
if (mql.matches) {
matches.push(new MediaChange(true, query));
}
});
return matches;
}
ngOnDestroy() {
let fn;
while (fn = this.pendingRemoveListenerFns.pop()) {
fn();
}
}
/**
* Call window.matchMedia() to build a MediaQueryList; which
* supports 0..n listeners for activation/deactivation
*/
buildMQL(query) {
return constructMql(query, isPlatformBrowser(this._platformId));
}
}
MatchMedia.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: MatchMedia, deps: [{ token: i0.NgZone }, { token: PLATFORM_ID }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Injectable });
MatchMedia.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: MatchMedia, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: MatchMedia, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: i0.NgZone }, { type: Object, decorators: [{
type: Inject,
args: [PLATFORM_ID]
}] }, { type: undefined, decorators: [{
type: Inject,
args: [DOCUMENT]
}] }]; } });
/**
* Private global registry for all dynamically-created, injected style tags
* @see prepare(query)
*/
const ALL_STYLES = {};
/**
* For Webkit engines that only trigger the MediaQueryList Listener
* when there is at least one CSS selector for the respective media query.
*
* @param mediaQueries
* @param _document
*/
function buildQueryCss(mediaQueries, _document) {
const list = mediaQueries.filter(it => !ALL_STYLES[it]);
if (list.length > 0) {
const query = list.join(', ');
try {
const styleEl = _document.createElement('style');
styleEl.setAttribute('type', 'text/css');
if (!styleEl.styleSheet) {
const cssText = `
/*
@angular/flex-layout - workaround for possible browser quirk with mediaQuery listeners
see http://bit.ly/2sd4HMP
*/
@media ${query} {.fx-query-test{ }}
`;
styleEl.appendChild(_document.createTextNode(cssText));
}
_document.head.appendChild(styleEl);
// Store in private global registry
list.forEach(mq => ALL_STYLES[mq] = styleEl);
}
catch (e) {
console.error(e);
}
}
}
function buildMockMql(query) {
const et = new EventTarget();
et.matches = query === 'all' || query === '';
et.media = query;
et.addListener = () => { };
et.removeListener = () => { };
et.addEventListener = () => { };
et.dispatchEvent = () => false;
et.onchange = null;
return et;
}
function constructMql(query, isBrowser) {
const canListen = isBrowser && !!window.matchMedia('all').addListener;
return canListen ? window.matchMedia(query) : buildMockMql(query);
}
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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 {Inject, Injectable, NgZone, OnDestroy, PLATFORM_ID} from '@angular/core';\nimport {DOCUMENT, isPlatformBrowser} from '@angular/common';\nimport {BehaviorSubject, Observable, merge, Observer} from 'rxjs';\nimport {filter} from 'rxjs/operators';\n\nimport {MediaChange} from '../media-change';\n\n/**\n * MediaMonitor configures listeners to mediaQuery changes and publishes an Observable facade to\n * convert mediaQuery change callbacks to subscriber notifications. These notifications will be\n * performed within the ng Zone to trigger change detections and component updates.\n *\n * NOTE: both mediaQuery activations and de-activations are announced in notifications\n */\n@Injectable({providedIn: 'root'})\nexport class MatchMedia implements OnDestroy {\n  /** Initialize source with 'all' so all non-responsive APIs trigger style updates */\n  readonly source = new BehaviorSubject<MediaChange>(new MediaChange(true));\n  registry = new Map<string, MediaQueryList>();\n  private readonly pendingRemoveListenerFns: Array<() => void> = [];\n\n  constructor(protected _zone: NgZone,\n              @Inject(PLATFORM_ID) protected _platformId: Object,\n              @Inject(DOCUMENT) protected _document: any) {\n  }\n\n  /**\n   * Publish list of all current activations\n   */\n  get activations(): string[] {\n    const results: string[] = [];\n    this.registry.forEach((mql: MediaQueryList, key: string) => {\n      if (mql.matches) {\n        results.push(key);\n      }\n    });\n    return results;\n  }\n\n  /**\n   * For the specified mediaQuery?\n   */\n  isActive(mediaQuery: string): boolean {\n    const mql = this.registry.get(mediaQuery);\n    return mql?.matches ?? this.registerQuery(mediaQuery).some(m => m.matches);\n  }\n\n  /**\n   * External observers can watch for all (or a specific) mql changes.\n   *\n   * If a mediaQuery is not specified, then ALL mediaQuery activations will\n   * be announced.\n   */\n  observe(): Observable<MediaChange>;\n  observe(mediaQueries: string[]): Observable<MediaChange>;\n  observe(mediaQueries: string[], filterOthers: boolean): Observable<MediaChange>;\n\n  /**\n   * External observers can watch for all (or a specific) mql changes.\n   * Typically used by the MediaQueryAdaptor; optionally available to components\n   * who wish to use the MediaMonitor as mediaMonitor$ observable service.\n   *\n   * Use deferred registration process to register breakpoints only on subscription\n   * This logic also enforces logic to register all mediaQueries BEFORE notify\n   * subscribers of notifications.\n   */\n  observe(mqList?: string[], filterOthers = false): Observable<MediaChange> {\n    if (mqList && mqList.length) {\n      const matchMedia$: Observable<MediaChange> = this._observable$.pipe(\n          filter((change: MediaChange) =>\n            !filterOthers ? true : (mqList.indexOf(change.mediaQuery) > -1))\n      );\n      const registration$: Observable<MediaChange> = new Observable((observer: Observer<MediaChange>) => {  // tslint:disable-line:max-line-length\n        const matches: Array<MediaChange> = this.registerQuery(mqList);\n        if (matches.length) {\n          const lastChange = matches.pop()!;\n          matches.forEach((e: MediaChange) => {\n            observer.next(e);\n          });\n          this.source.next(lastChange); // last match is cached\n        }\n        observer.complete();\n      });\n      return merge(registration$, matchMedia$);\n    }\n\n    return this._observable$;\n  }\n\n  /**\n   * Based on the BreakPointRegistry provider, register internal listeners for each unique\n   * mediaQuery. Each listener emits specific MediaChange data to observers\n   */\n  registerQuery(mediaQuery: string | string[]) {\n    const list = Array.isArray(mediaQuery) ? mediaQuery : [mediaQuery];\n    const matches: MediaChange[] = [];\n\n    buildQueryCss(list, this._document);\n\n    list.forEach((query: string) => {\n      const onMQLEvent = (e: MediaQueryListEvent) => {\n        this._zone.run(() => this.source.next(new MediaChange(e.matches, query)));\n      };\n\n      let mql = this.registry.get(query);\n      if (!mql) {\n        mql = this.buildMQL(query);\n        mql.addListener(onMQLEvent);\n        this.pendingRemoveListenerFns.push(() => mql!.removeListener(onMQLEvent));\n        this.registry.set(query, mql);\n      }\n\n      if (mql.matches) {\n        matches.push(new MediaChange(true, query));\n      }\n    });\n\n    return matches;\n  }\n\n  ngOnDestroy(): void {\n    let fn;\n    while (fn = this.pendingRemoveListenerFns.pop()) {\n      fn();\n    }\n  }\n\n  /**\n   * Call window.matchMedia() to build a MediaQueryList; which\n   * supports 0..n listeners for activation/deactivation\n   */\n  protected buildMQL(query: string): MediaQueryList {\n    return constructMql(query, isPlatformBrowser(this._platformId));\n  }\n\n  protected _observable$ = this.source.asObservable();\n}\n\n/**\n * Private global registry for all dynamically-created, injected style tags\n * @see prepare(query)\n */\nconst ALL_STYLES: { [key: string]: any } = {};\n\n/**\n * For Webkit engines that only trigger the MediaQueryList Listener\n * when there is at least one CSS selector for the respective media query.\n *\n * @param mediaQueries\n * @param _document\n */\nfunction buildQueryCss(mediaQueries: string[], _document: Document) {\n  const list = mediaQueries.filter(it => !ALL_STYLES[it]);\n  if (list.length > 0) {\n    const query = list.join(', ');\n\n    try {\n      const styleEl = _document.createElement('style');\n\n      styleEl.setAttribute('type', 'text/css');\n      if (!(styleEl as any).styleSheet) {\n        const cssText = `\n/*\n  @angular/flex-layout - workaround for possible browser quirk with mediaQuery listeners\n  see http://bit.ly/2sd4HMP\n*/\n@media ${query} {.fx-query-test{ }}\n`;\n        styleEl.appendChild(_document.createTextNode(cssText));\n      }\n\n      _document.head!.appendChild(styleEl);\n\n      // Store in private global registry\n      list.forEach(mq => ALL_STYLES[mq] = styleEl);\n\n    } catch (e) {\n      console.error(e);\n    }\n  }\n}\n\nfunction buildMockMql(query: string) {\n  const et: any = new EventTarget();\n  et.matches = query === 'all' || query === '';\n  et.media = query;\n  et.addListener = () => {};\n  et.removeListener = () => {};\n  et.addEventListener = () => {};\n  et.dispatchEvent = () => false;\n  et.onchange = null;\n\n  return et as MediaQueryList;\n}\n\nfunction constructMql(query: string, isBrowser: boolean): MediaQueryList {\n  const canListen = isBrowser && !!(<Window>window).matchMedia('all').addListener;\n\n  return canListen ? (<Window>window).matchMedia(query) : buildMockMql(query);\n}\n"]}