import { Directory, FileEntry, Root } from 'aspen-core';
import { IDisposable } from 'notificar';
import { ISerializableState } from './types';
export declare enum Operation {
    SetExpanded = 1,
    SetCollapsed = 2,
    SetActive = 3
}
export declare class TreeStateManager {
    private root;
    private events;
    private expandedDirectories;
    private _scrollOffset;
    private stashing;
    private stashKeyframes;
    private stashLockingItems;
    constructor(root: Root);
    get scrollOffset(): number;
    saveScrollOffset(scrollOffset: number): void;
    onDidLoadState(callback: () => void): IDisposable;
    onChangeScrollOffset(callback: (newOffset: number) => void): IDisposable;
    onDidChangeDirExpansionState(callback: (relDirPath: string, nowExpanded: boolean, visibleAtSurface: boolean) => void): IDisposable;
    onDidChangeRelativePath(callback: (prevPath: string, newPath: string) => void): IDisposable;
    /**
     * Starts recording directory expands and collapses
     *
     * `reverseStash` can then be used to undo all those actions.
     *
     * Internally used by `FileTree#peekABoo`
     *
     * Stashing can be used for peeking file(s) temporarily, where you don't want a mess of expanded folders for user to deal with.
     *
     * `beginStashing` => then expand the folder(s) you need to get to the file you want => `endStahsing` => once you're done => `reverseStash` to clean up the mess
     */
    beginStashing(): void;
    /**
     * Ends the recording session of directory expands and collapses
     *
     * See documentation for `beginStashing` for details
     */
    endStashing(): void;
    /**
     * Reverses all the recorded directory expands and collapses
     *
     * See documentation for `beginStashing` for details
     */
    reverseStash(): Promise<void>;
    loadTreeState(state: ISerializableState): Promise<void>;
    /**
     * This will ensure directory expansions aren't altered atleast for directories leading to file to be excluded when `reverseStash` is called
     */
    excludeFromStash(file: FileEntry | Directory): void;
    private handleExpansionChange;
    private handleDidChangePath;
}