54 lines
1.2 KiB
TypeScript
54 lines
1.2 KiB
TypeScript
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import { EditorSelection, EditorView } from "./deps.ts";
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class PageState {
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constructor(
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readonly scrollTop: number,
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readonly selection: EditorSelection,
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) {}
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}
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export class OpenPages {
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openPages = new Map<string, PageState>();
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constructor(private editorView: EditorView) {}
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restoreState(pageName: string): boolean {
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const pageState = this.openPages.get(pageName);
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const editorView = this.editorView;
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if (pageState) {
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// Restore state
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editorView.scrollDOM.scrollTop = pageState!.scrollTop;
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try {
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editorView.dispatch({
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selection: pageState.selection,
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scrollIntoView: true,
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});
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} catch {
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// This is fine, just go to the top
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editorView.dispatch({
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selection: { anchor: 0 },
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scrollIntoView: true,
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});
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}
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} else {
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editorView.scrollDOM.scrollTop = 0;
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editorView.dispatch({
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selection: { anchor: 0 },
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scrollIntoView: true,
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});
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}
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editorView.focus();
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return !!pageState;
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}
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saveState(currentPage: string) {
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this.openPages.set(
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currentPage,
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new PageState(
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this.editorView!.scrollDOM.scrollTop,
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this.editorView!.state.selection,
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),
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);
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}
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}
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