@angular/flex-layout
Version:
Angular Flex-Layout =======
188 lines • 22 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 { fromEvent } from 'rxjs';
import { take } from 'rxjs/operators';
import { mergeAlias } from '../add-alias';
import { MediaChange } from '../media-change';
import { sortDescendingPriority } from '../utils/sort';
import { LAYOUT_CONFIG } from '../tokens/library-config';
import * as i0 from "@angular/core";
import * as i1 from "../breakpoints/break-point-registry";
import * as i2 from "../match-media/match-media";
/**
* Class
*/
export class MediaTrigger {
constructor(breakpoints, matchMedia, layoutConfig, _platformId, _document) {
this.breakpoints = breakpoints;
this.matchMedia = matchMedia;
this.layoutConfig = layoutConfig;
this._platformId = _platformId;
this._document = _document;
this.hasCachedRegistryMatches = false;
this.originalActivations = [];
this.originalRegistry = new Map();
}
/**
* Manually activate range of breakpoints
* @param list array of mediaQuery or alias strings
*/
activate(list) {
list = list.map(it => it.trim()); // trim queries
this.saveActivations();
this.deactivateAll();
this.setActivations(list);
this.prepareAutoRestore();
}
/**
* Restore original, 'real' breakpoints and emit events
* to trigger stream notification
*/
restore() {
if (this.hasCachedRegistryMatches) {
const extractQuery = (change) => change.mediaQuery;
const list = this.originalActivations.map(extractQuery);
try {
this.deactivateAll();
this.restoreRegistryMatches();
this.setActivations(list);
}
finally {
this.originalActivations = [];
if (this.resizeSubscription) {
this.resizeSubscription.unsubscribe();
}
}
}
}
// ************************************************
// Internal Methods
// ************************************************
/**
* Whenever window resizes, immediately auto-restore original
* activations (if we are simulating activations)
*/
prepareAutoRestore() {
const isBrowser = isPlatformBrowser(this._platformId) && this._document;
const enableAutoRestore = isBrowser && this.layoutConfig.mediaTriggerAutoRestore;
if (enableAutoRestore) {
const resize$ = fromEvent(window, 'resize').pipe(take(1));
this.resizeSubscription = resize$.subscribe(this.restore.bind(this));
}
}
/**
* Notify all matchMedia subscribers of de-activations
*
* Note: we must force 'matches' updates for
* future matchMedia::activation lookups
*/
deactivateAll() {
const list = this.currentActivations;
this.forceRegistryMatches(list, false);
this.simulateMediaChanges(list, false);
}
/**
* Cache current activations as sorted, prioritized list of MediaChanges
*/
saveActivations() {
if (!this.hasCachedRegistryMatches) {
const toMediaChange = (query) => new MediaChange(true, query);
const mergeMQAlias = (change) => {
const bp = this.breakpoints.findByQuery(change.mediaQuery);
return mergeAlias(change, bp);
};
this.originalActivations = this.currentActivations
.map(toMediaChange)
.map(mergeMQAlias)
.sort(sortDescendingPriority);
this.cacheRegistryMatches();
}
}
/**
* Force set manual activations for specified mediaQuery list
*/
setActivations(list) {
if (!!this.originalRegistry) {
this.forceRegistryMatches(list, true);
}
this.simulateMediaChanges(list);
}
/**
* For specified mediaQuery list manually simulate activations or deactivations
*/
simulateMediaChanges(queries, matches = true) {
const toMediaQuery = (query) => {
const locator = this.breakpoints;
const bp = locator.findByAlias(query) || locator.findByQuery(query);
return bp ? bp.mediaQuery : query;
};
const emitChangeEvent = (query) => this.emitChangeEvent(matches, query);
queries.map(toMediaQuery).forEach(emitChangeEvent);
}
/**
* Replace current registry with simulated registry...
* Note: this is required since MediaQueryList::matches is 'readOnly'
*/
forceRegistryMatches(queries, matches) {
const registry = new Map();
queries.forEach(query => {
registry.set(query, { matches });
});
this.matchMedia.registry = registry;
}
/**
* Save current MatchMedia::registry items.
*/
cacheRegistryMatches() {
const target = this.originalRegistry;
target.clear();
this.matchMedia.registry.forEach((value, key) => {
target.set(key, value);
});
this.hasCachedRegistryMatches = true;
}
/**
* Restore original, 'true' registry
*/
restoreRegistryMatches() {
const target = this.matchMedia.registry;
target.clear();
this.originalRegistry.forEach((value, key) => {
target.set(key, value);
});
this.originalRegistry.clear();
this.hasCachedRegistryMatches = false;
}
/**
* Manually emit a MediaChange event via the MatchMedia to MediaMarshaller and MediaObserver
*/
emitChangeEvent(matches, query) {
this.matchMedia.source.next(new MediaChange(matches, query));
}
get currentActivations() {
return this.matchMedia.activations;
}
}
MediaTrigger.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: MediaTrigger, deps: [{ token: i1.BreakPointRegistry }, { token: i2.MatchMedia }, { token: LAYOUT_CONFIG }, { token: PLATFORM_ID }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Injectable });
MediaTrigger.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: MediaTrigger, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: MediaTrigger, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: i1.BreakPointRegistry }, { type: i2.MatchMedia }, { type: undefined, decorators: [{
type: Inject,
args: [LAYOUT_CONFIG]
}] }, { type: Object, decorators: [{
type: Inject,
args: [PLATFORM_ID]
}] }, { type: undefined, decorators: [{
type: Inject,
args: [DOCUMENT]
}] }]; } });
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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, PLATFORM_ID} from '@angular/core';\nimport {DOCUMENT, isPlatformBrowser} from '@angular/common';\n\nimport {fromEvent, Subscription} from 'rxjs';\nimport {take} from 'rxjs/operators';\n\nimport {mergeAlias} from '../add-alias';\nimport {MediaChange} from '../media-change';\nimport {MatchMedia} from '../match-media/match-media';\nimport {BreakPointRegistry, OptionalBreakPoint} from '../breakpoints/break-point-registry';\nimport {sortDescendingPriority} from '../utils/sort';\nimport {LAYOUT_CONFIG, LayoutConfigOptions} from '../tokens/library-config';\n\n/**\n * Class\n */\n@Injectable({providedIn: 'root'})\nexport class MediaTrigger {\n\n  constructor(\n      protected breakpoints: BreakPointRegistry,\n      protected matchMedia: MatchMedia,\n      @Inject(LAYOUT_CONFIG) protected layoutConfig: LayoutConfigOptions,\n      @Inject(PLATFORM_ID) protected _platformId: Object,\n      @Inject(DOCUMENT) protected _document: any) {\n  }\n\n  /**\n   * Manually activate range of breakpoints\n   * @param list array of mediaQuery or alias strings\n   */\n  activate(list: string[]) {\n    list = list.map(it => it.trim()); // trim queries\n\n    this.saveActivations();\n    this.deactivateAll();\n    this.setActivations(list);\n\n    this.prepareAutoRestore();\n  }\n\n  /**\n   * Restore original, 'real' breakpoints and emit events\n   * to trigger stream notification\n   */\n  restore() {\n    if (this.hasCachedRegistryMatches) {\n      const extractQuery = (change: MediaChange) => change.mediaQuery;\n      const list = this.originalActivations.map(extractQuery);\n      try {\n        this.deactivateAll();\n        this.restoreRegistryMatches();\n        this.setActivations(list);\n      } finally {\n        this.originalActivations = [];\n        if (this.resizeSubscription) {\n          this.resizeSubscription.unsubscribe();\n        }\n      }\n    }\n  }\n\n  // ************************************************\n  // Internal Methods\n  // ************************************************\n\n  /**\n   * Whenever window resizes, immediately auto-restore original\n   * activations (if we are simulating activations)\n   */\n  private prepareAutoRestore() {\n    const isBrowser = isPlatformBrowser(this._platformId) && this._document;\n    const enableAutoRestore = isBrowser && this.layoutConfig.mediaTriggerAutoRestore;\n\n    if (enableAutoRestore) {\n      const resize$ = fromEvent(window, 'resize').pipe(take(1));\n      this.resizeSubscription = resize$.subscribe(this.restore.bind(this));\n    }\n  }\n\n  /**\n   * Notify all matchMedia subscribers of de-activations\n   *\n   * Note: we must force 'matches' updates for\n   *       future matchMedia::activation lookups\n   */\n  private deactivateAll() {\n    const list = this.currentActivations;\n\n    this.forceRegistryMatches(list, false);\n    this.simulateMediaChanges(list, false);\n  }\n\n  /**\n   * Cache current activations as sorted, prioritized list of MediaChanges\n   */\n  private saveActivations() {\n    if (!this.hasCachedRegistryMatches) {\n      const toMediaChange = (query: string) => new MediaChange(true, query);\n      const mergeMQAlias = (change: MediaChange) => {\n        const bp: OptionalBreakPoint = this.breakpoints.findByQuery(change.mediaQuery);\n        return mergeAlias(change, bp);\n      };\n\n      this.originalActivations = this.currentActivations\n          .map(toMediaChange)\n          .map(mergeMQAlias)\n          .sort(sortDescendingPriority);\n\n      this.cacheRegistryMatches();\n    }\n  }\n\n  /**\n   * Force set manual activations for specified mediaQuery list\n   */\n  private setActivations(list: string[]) {\n    if (!!this.originalRegistry) {\n      this.forceRegistryMatches(list, true);\n    }\n    this.simulateMediaChanges(list);\n  }\n\n  /**\n   * For specified mediaQuery list manually simulate activations or deactivations\n   */\n  private simulateMediaChanges(queries: string[], matches = true) {\n    const toMediaQuery = (query: string) => {\n      const locator = this.breakpoints;\n      const bp = locator.findByAlias(query) || locator.findByQuery(query);\n      return bp ? bp.mediaQuery : query;\n    };\n    const emitChangeEvent = (query: string) => this.emitChangeEvent(matches, query);\n\n    queries.map(toMediaQuery).forEach(emitChangeEvent);\n  }\n\n  /**\n   * Replace current registry with simulated registry...\n   * Note: this is required since MediaQueryList::matches is 'readOnly'\n   */\n  private forceRegistryMatches(queries: string[], matches: boolean) {\n    const registry = new Map<string, MediaQueryList>();\n    queries.forEach(query => {\n      registry.set(query, {matches} as MediaQueryList);\n    });\n\n    this.matchMedia.registry = registry;\n  }\n\n  /**\n   * Save current MatchMedia::registry items.\n   */\n  private cacheRegistryMatches() {\n    const target = this.originalRegistry;\n\n    target.clear();\n    this.matchMedia.registry.forEach((value: MediaQueryList, key: string) => {\n      target.set(key, value);\n    });\n    this.hasCachedRegistryMatches = true;\n  }\n\n  /**\n   * Restore original, 'true' registry\n   */\n  private restoreRegistryMatches() {\n    const target = this.matchMedia.registry;\n\n    target.clear();\n    this.originalRegistry.forEach((value: MediaQueryList, key: string) => {\n      target.set(key, value);\n    });\n\n    this.originalRegistry.clear();\n    this.hasCachedRegistryMatches = false;\n  }\n\n  /**\n   * Manually emit a MediaChange event via the MatchMedia to MediaMarshaller and MediaObserver\n   */\n  private emitChangeEvent(matches: boolean, query: string) {\n    this.matchMedia.source.next(new MediaChange(matches, query));\n  }\n\n  private get currentActivations(): string[] {\n    return this.matchMedia.activations;\n  }\n\n  private hasCachedRegistryMatches = false;\n  private originalActivations: MediaChange[] = [];\n  private originalRegistry: Map<string, MediaQueryList> = new Map<string, MediaQueryList>();\n\n  private resizeSubscription!: Subscription;\n}\n\n"]}