@angular/router
Version:
Angular - the routing library
132 lines (131 loc) • 13.1 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
/**
* @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
*/
import { NavigationEnd, NavigationStart, Scroll } from './events';
export class RouterScroller {
/**
* @param {?} router
* @param {?} viewportScroller
* @param {?=} options
*/
constructor(router, viewportScroller, options = {}) {
this.router = router;
this.viewportScroller = viewportScroller;
this.options = options;
this.lastId = 0;
this.lastSource = 'imperative';
this.restoredId = 0;
this.store = {};
// Default both options to 'disabled'
options.scrollPositionRestoration = options.scrollPositionRestoration || 'disabled';
options.anchorScrolling = options.anchorScrolling || 'disabled';
}
/**
* @return {?}
*/
init() {
// we want to disable the automatic scrolling because having two places
// responsible for scrolling results race conditions, especially given
// that browser don't implement this behavior consistently
if (this.options.scrollPositionRestoration !== 'disabled') {
this.viewportScroller.setHistoryScrollRestoration('manual');
}
this.routerEventsSubscription = this.createScrollEvents();
this.scrollEventsSubscription = this.consumeScrollEvents();
}
/**
* @return {?}
*/
createScrollEvents() {
return this.router.events.subscribe(e => {
if (e instanceof NavigationStart) {
// store the scroll position of the current stable navigations.
this.store[this.lastId] = this.viewportScroller.getScrollPosition();
this.lastSource = e.navigationTrigger;
this.restoredId = e.restoredState ? e.restoredState.navigationId : 0;
}
else if (e instanceof NavigationEnd) {
this.lastId = e.id;
this.scheduleScrollEvent(e, this.router.parseUrl(e.urlAfterRedirects).fragment);
}
});
}
/**
* @return {?}
*/
consumeScrollEvents() {
return this.router.events.subscribe(e => {
if (!(e instanceof Scroll))
return;
// a popstate event. The pop state event will always ignore anchor scrolling.
if (e.position) {
if (this.options.scrollPositionRestoration === 'top') {
this.viewportScroller.scrollToPosition([0, 0]);
}
else if (this.options.scrollPositionRestoration === 'enabled') {
this.viewportScroller.scrollToPosition(e.position);
}
// imperative navigation "forward"
}
else {
if (e.anchor && this.options.anchorScrolling === 'enabled') {
this.viewportScroller.scrollToAnchor(e.anchor);
}
else if (this.options.scrollPositionRestoration !== 'disabled') {
this.viewportScroller.scrollToPosition([0, 0]);
}
}
});
}
/**
* @param {?} routerEvent
* @param {?} anchor
* @return {?}
*/
scheduleScrollEvent(routerEvent, anchor) {
this.router.triggerEvent(new Scroll(routerEvent, this.lastSource === 'popstate' ? this.store[this.restoredId] : null, anchor));
}
/**
* @return {?}
*/
ngOnDestroy() {
if (this.routerEventsSubscription) {
this.routerEventsSubscription.unsubscribe();
}
if (this.scrollEventsSubscription) {
this.scrollEventsSubscription.unsubscribe();
}
}
}
if (false) {
/** @type {?} */
RouterScroller.prototype.routerEventsSubscription;
/** @type {?} */
RouterScroller.prototype.scrollEventsSubscription;
/** @type {?} */
RouterScroller.prototype.lastId;
/** @type {?} */
RouterScroller.prototype.lastSource;
/** @type {?} */
RouterScroller.prototype.restoredId;
/** @type {?} */
RouterScroller.prototype.store;
/** @type {?} */
RouterScroller.prototype.router;
/**
* \@docsNotRequired
* @type {?}
*/
RouterScroller.prototype.viewportScroller;
/** @type {?} */
RouterScroller.prototype.options;
}
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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 {OnDestroy} from '@angular/core';\nimport {Unsubscribable} from 'rxjs';\n\nimport {NavigationEnd, NavigationStart, Scroll} from './events';\nimport {Router} from './router';\n\nexport class RouterScroller implements OnDestroy {\n  // TODO(issue/24571): remove '!'.\n  private routerEventsSubscription !: Unsubscribable;\n  // TODO(issue/24571): remove '!'.\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  constructor(\n      private router: Router,\n      /** @docsNotRequired */ public readonly viewportScroller: ViewportScroller, 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.router.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.router.parseUrl(e.urlAfterRedirects).fragment);\n      }\n    });\n  }\n\n  private consumeScrollEvents() {\n    return this.router.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, anchor: string|null): void {\n    this.router.triggerEvent(new Scroll(\n        routerEvent, this.lastSource === 'popstate' ? this.store[this.restoredId] : null, anchor));\n  }\n\n  ngOnDestroy() {\n    if (this.routerEventsSubscription) {\n      this.routerEventsSubscription.unsubscribe();\n    }\n    if (this.scrollEventsSubscription) {\n      this.scrollEventsSubscription.unsubscribe();\n    }\n  }\n}\n"]}