59 lines
1.4 KiB
TypeScript
59 lines
1.4 KiB
TypeScript
import { safeRun } from "./util";
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function encodePageUrl(name: string): string {
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return name.replaceAll(" ", "_");
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}
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function decodePageUrl(url: string): string {
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return url.replaceAll("_", " ");
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}
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export class PathPageNavigator {
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navigationResolve?: () => void;
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async navigate(page: string, pos?: number) {
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window.history.pushState({ page, pos }, page, `/${encodePageUrl(page)}`);
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window.dispatchEvent(
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new PopStateEvent("popstate", {
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state: { page, pos },
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})
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);
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await new Promise<void>((resolve) => {
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this.navigationResolve = resolve;
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});
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this.navigationResolve = undefined;
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}
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subscribe(
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pageLoadCallback: (pageName: string, pos: number) => Promise<void>
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): void {
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const cb = (event?: PopStateEvent) => {
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const gotoPage = this.getCurrentPage();
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if (!gotoPage) {
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return;
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}
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safeRun(async () => {
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await pageLoadCallback(
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this.getCurrentPage(),
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event?.state && event.state.pos
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);
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if (this.navigationResolve) {
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this.navigationResolve();
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}
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});
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};
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window.addEventListener("popstate", cb);
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cb();
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}
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getCurrentPage(): string {
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let [page] = location.pathname.substring(1).split("@");
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return decodePageUrl(page);
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}
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getCurrentPos(): number {
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let [, pos] = location.pathname.substring(1).split("@");
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return +pos || 0;
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}
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}
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