81 lines
3.2 KiB
TypeScript
81 lines
3.2 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. 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 {BehaviorSubject} from 'rxjs';
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import {DetachedRouteHandleInternal, RouteReuseStrategy} from './route_reuse_strategy';
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import {ActivatedRoute, ActivatedRouteSnapshot, RouterState, RouterStateSnapshot} from './router_state';
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import {TreeNode} from './utils/tree';
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export function createRouterState(
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routeReuseStrategy: RouteReuseStrategy, curr: RouterStateSnapshot,
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prevState: RouterState): RouterState {
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const root = createNode(routeReuseStrategy, curr._root, prevState ? prevState._root : undefined);
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return new RouterState(root, curr);
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}
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function createNode(
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routeReuseStrategy: RouteReuseStrategy, curr: TreeNode<ActivatedRouteSnapshot>,
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prevState?: TreeNode<ActivatedRoute>): TreeNode<ActivatedRoute> {
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// reuse an activated route that is currently displayed on the screen
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if (prevState && routeReuseStrategy.shouldReuseRoute(curr.value, prevState.value.snapshot)) {
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const value = prevState.value;
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value._futureSnapshot = curr.value;
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const children = createOrReuseChildren(routeReuseStrategy, curr, prevState);
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return new TreeNode<ActivatedRoute>(value, children);
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// retrieve an activated route that is used to be displayed, but is not currently displayed
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} else {
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const detachedRouteHandle =
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<DetachedRouteHandleInternal>routeReuseStrategy.retrieve(curr.value);
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if (detachedRouteHandle) {
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const tree: TreeNode<ActivatedRoute> = detachedRouteHandle.route;
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setFutureSnapshotsOfActivatedRoutes(curr, tree);
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return tree;
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} else {
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const value = createActivatedRoute(curr.value);
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const children = curr.children.map(c => createNode(routeReuseStrategy, c));
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return new TreeNode<ActivatedRoute>(value, children);
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}
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}
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}
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function setFutureSnapshotsOfActivatedRoutes(
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curr: TreeNode<ActivatedRouteSnapshot>, result: TreeNode<ActivatedRoute>): void {
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if (curr.value.routeConfig !== result.value.routeConfig) {
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throw new Error('Cannot reattach ActivatedRouteSnapshot created from a different route');
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}
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if (curr.children.length !== result.children.length) {
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throw new Error('Cannot reattach ActivatedRouteSnapshot with a different number of children');
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}
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result.value._futureSnapshot = curr.value;
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for (let i = 0; i < curr.children.length; ++i) {
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setFutureSnapshotsOfActivatedRoutes(curr.children[i], result.children[i]);
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}
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}
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function createOrReuseChildren(
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routeReuseStrategy: RouteReuseStrategy, curr: TreeNode<ActivatedRouteSnapshot>,
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prevState: TreeNode<ActivatedRoute>) {
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return curr.children.map(child => {
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for (const p of prevState.children) {
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if (routeReuseStrategy.shouldReuseRoute(p.value.snapshot, child.value)) {
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return createNode(routeReuseStrategy, child, p);
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}
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}
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return createNode(routeReuseStrategy, child);
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});
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}
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function createActivatedRoute(c: ActivatedRouteSnapshot) {
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return new ActivatedRoute(
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new BehaviorSubject(c.url), new BehaviorSubject(c.params), new BehaviorSubject(c.queryParams),
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new BehaviorSubject(c.fragment), new BehaviorSubject(c.data), c.outlet, c.component, c);
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}
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