111 lines
16 KiB
JavaScript
Executable File
111 lines
16 KiB
JavaScript
Executable File
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import { ViewportScroller } from '@angular/common';
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import { Injectable, InjectionToken, NgZone } from '@angular/core';
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import { NavigationEnd, NavigationSkipped, NavigationStart, Scroll } from './events';
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import { NavigationTransitions } from './navigation_transition';
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import { UrlSerializer } from './url_tree';
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import * as i0 from "@angular/core";
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import * as i1 from "./url_tree";
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import * as i2 from "./navigation_transition";
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import * as i3 from "@angular/common";
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export const ROUTER_SCROLLER = new InjectionToken('');
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export class RouterScroller {
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/** @nodoc */
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constructor(urlSerializer, transitions, viewportScroller, zone, options = {}) {
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this.urlSerializer = urlSerializer;
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this.transitions = transitions;
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this.viewportScroller = viewportScroller;
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this.zone = zone;
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this.options = options;
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this.lastId = 0;
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this.lastSource = 'imperative';
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this.restoredId = 0;
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this.store = {};
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// Default both options to 'disabled'
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options.scrollPositionRestoration = options.scrollPositionRestoration || 'disabled';
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options.anchorScrolling = options.anchorScrolling || 'disabled';
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}
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init() {
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// we want to disable the automatic scrolling because having two places
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// responsible for scrolling results race conditions, especially given
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// that browser don't implement this behavior consistently
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if (this.options.scrollPositionRestoration !== 'disabled') {
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this.viewportScroller.setHistoryScrollRestoration('manual');
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}
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this.routerEventsSubscription = this.createScrollEvents();
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this.scrollEventsSubscription = this.consumeScrollEvents();
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}
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createScrollEvents() {
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return this.transitions.events.subscribe(e => {
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if (e instanceof NavigationStart) {
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// store the scroll position of the current stable navigations.
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this.store[this.lastId] = this.viewportScroller.getScrollPosition();
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this.lastSource = e.navigationTrigger;
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this.restoredId = e.restoredState ? e.restoredState.navigationId : 0;
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}
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else if (e instanceof NavigationEnd) {
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this.lastId = e.id;
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this.scheduleScrollEvent(e, this.urlSerializer.parse(e.urlAfterRedirects).fragment);
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}
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else if (e instanceof NavigationSkipped &&
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e.code === 0 /* NavigationSkippedCode.IgnoredSameUrlNavigation */) {
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this.lastSource = undefined;
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this.restoredId = 0;
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this.scheduleScrollEvent(e, this.urlSerializer.parse(e.url).fragment);
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}
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});
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}
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consumeScrollEvents() {
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return this.transitions.events.subscribe(e => {
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if (!(e instanceof Scroll))
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return;
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// a popstate event. The pop state event will always ignore anchor scrolling.
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if (e.position) {
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if (this.options.scrollPositionRestoration === 'top') {
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this.viewportScroller.scrollToPosition([0, 0]);
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}
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else if (this.options.scrollPositionRestoration === 'enabled') {
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this.viewportScroller.scrollToPosition(e.position);
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}
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// imperative navigation "forward"
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}
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else {
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if (e.anchor && this.options.anchorScrolling === 'enabled') {
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this.viewportScroller.scrollToAnchor(e.anchor);
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}
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else if (this.options.scrollPositionRestoration !== 'disabled') {
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this.viewportScroller.scrollToPosition([0, 0]);
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}
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}
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});
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}
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scheduleScrollEvent(routerEvent, anchor) {
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this.zone.runOutsideAngular(() => {
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// The scroll event needs to be delayed until after change detection. Otherwise, we may
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// attempt to restore the scroll position before the router outlet has fully rendered the
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// component by executing its update block of the template function.
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setTimeout(() => {
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this.zone.run(() => {
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this.transitions.events.next(new Scroll(routerEvent, this.lastSource === 'popstate' ? this.store[this.restoredId] : null, anchor));
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});
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}, 0);
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});
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}
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/** @nodoc */
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ngOnDestroy() {
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this.routerEventsSubscription?.unsubscribe();
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this.scrollEventsSubscription?.unsubscribe();
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}
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static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.0.8", ngImport: i0, type: RouterScroller, deps: "invalid", target: i0.ɵɵFactoryTarget.Injectable }); }
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static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "17.0.8", ngImport: i0, type: RouterScroller }); }
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}
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i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.0.8", ngImport: i0, type: RouterScroller, decorators: [{
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type: Injectable
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}], ctorParameters: () => [{ type: i1.UrlSerializer }, { type: i2.NavigationTransitions }, { type: i3.ViewportScroller }, { type: i0.NgZone }, { type: undefined }] });
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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 */\n\nimport {ViewportScroller} from '@angular/common';\nimport {Injectable, InjectionToken, NgZone, OnDestroy} from '@angular/core';\nimport {Unsubscribable} from 'rxjs';\n\nimport {NavigationEnd, NavigationSkipped, NavigationSkippedCode, NavigationStart, Scroll} from './events';\nimport {NavigationTransitions} from './navigation_transition';\nimport {UrlSerializer} from './url_tree';\n\nexport const ROUTER_SCROLLER = new InjectionToken<RouterScroller>('');\n\n@Injectable()\nexport class RouterScroller implements OnDestroy {\n  private routerEventsSubscription?: Unsubscribable;\n  private scrollEventsSubscription?: Unsubscribable;\n\n  private lastId = 0;\n  private lastSource: 'imperative'|'popstate'|'hashchange'|undefined = 'imperative';\n  private restoredId = 0;\n  private store: {[key: string]: [number, number]} = {};\n\n  /** @nodoc */\n  constructor(\n      readonly urlSerializer: UrlSerializer, private transitions: NavigationTransitions,\n      public readonly viewportScroller: ViewportScroller, private readonly zone: NgZone,\n      private options: {\n        scrollPositionRestoration?: 'disabled'|'enabled'|'top',\n        anchorScrolling?: 'disabled'|'enabled'\n      } = {}) {\n    // Default both options to 'disabled'\n    options.scrollPositionRestoration = options.scrollPositionRestoration || 'disabled';\n    options.anchorScrolling = options.anchorScrolling || 'disabled';\n  }\n\n  init(): void {\n    // we want to disable the automatic scrolling because having two places\n    // responsible for scrolling results race conditions, especially given\n    // that browser don't implement this behavior consistently\n    if (this.options.scrollPositionRestoration !== 'disabled') {\n      this.viewportScroller.setHistoryScrollRestoration('manual');\n    }\n    this.routerEventsSubscription = this.createScrollEvents();\n    this.scrollEventsSubscription = this.consumeScrollEvents();\n  }\n\n  private createScrollEvents() {\n    return this.transitions.events.subscribe(e => {\n      if (e instanceof NavigationStart) {\n        // store the scroll position of the current stable navigations.\n        this.store[this.lastId] = this.viewportScroller.getScrollPosition();\n        this.lastSource = e.navigationTrigger;\n        this.restoredId = e.restoredState ? e.restoredState.navigationId : 0;\n      } else if (e instanceof NavigationEnd) {\n        this.lastId = e.id;\n        this.scheduleScrollEvent(e, this.urlSerializer.parse(e.urlAfterRedirects).fragment);\n      } else if (\n          e instanceof NavigationSkipped &&\n          e.code === NavigationSkippedCode.IgnoredSameUrlNavigation) {\n        this.lastSource = undefined;\n        this.restoredId = 0;\n        this.scheduleScrollEvent(e, this.urlSerializer.parse(e.url).fragment);\n      }\n    });\n  }\n\n  private consumeScrollEvents() {\n    return this.transitions.events.subscribe(e => {\n      if (!(e instanceof Scroll)) return;\n      // a popstate event. The pop state event will always ignore anchor scrolling.\n      if (e.position) {\n        if (this.options.scrollPositionRestoration === 'top') {\n          this.viewportScroller.scrollToPosition([0, 0]);\n        } else if (this.options.scrollPositionRestoration === 'enabled') {\n          this.viewportScroller.scrollToPosition(e.position);\n        }\n        // imperative navigation \"forward\"\n      } else {\n        if (e.anchor && this.options.anchorScrolling === 'enabled') {\n          this.viewportScroller.scrollToAnchor(e.anchor);\n        } else if (this.options.scrollPositionRestoration !== 'disabled') {\n          this.viewportScroller.scrollToPosition([0, 0]);\n        }\n      }\n    });\n  }\n\n  private scheduleScrollEvent(routerEvent: NavigationEnd|NavigationSkipped, anchor: string|null):\n      void {\n    this.zone.runOutsideAngular(() => {\n      // The scroll event needs to be delayed until after change detection. Otherwise, we may\n      // attempt to restore the scroll position before the router outlet has fully rendered the\n      // component by executing its update block of the template function.\n      setTimeout(() => {\n        this.zone.run(() => {\n          this.transitions.events.next(new Scroll(\n              routerEvent, this.lastSource === 'popstate' ? this.store[this.restoredId] : null,\n              anchor));\n        });\n      }, 0);\n    });\n  }\n\n  /** @nodoc */\n  ngOnDestroy() {\n    this.routerEventsSubscription?.unsubscribe();\n    this.scrollEventsSubscription?.unsubscribe();\n  }\n}\n"]}
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