import type { Event } from '@difizen/mana-common';
import { Emitter } from '@difizen/mana-common';
import type { TreeNode } from './tree';
import { Tree } from './tree';
import { TreeSelectionService, SelectableTreeNode, TreeSelection } from './tree-selection';
import { TreeSelectionState } from './tree-selection-state';
export declare class TreeSelectionServiceImpl implements TreeSelectionService {
    protected readonly tree: Tree;
    constructor(tree: Tree);
    protected readonly onSelectionChangedEmitter: Emitter<readonly Readonly<SelectableTreeNode>[]>;
    protected state?: TreeSelectionState;
    protected init(): void;
    dispose(): void;
    get selectedNodes(): readonly Readonly<SelectableTreeNode>[];
    get onSelectionChanged(): Event<readonly Readonly<SelectableTreeNode>[]>;
    protected fireSelectionChanged(): void;
    addSelection(selectionOrTreeNode: TreeSelection | Readonly<SelectableTreeNode>): void;
    protected transiteTo(newState: TreeSelectionState): void;
    protected unselect(nodes: readonly SelectableTreeNode[]): void;
    protected select(nodes: readonly SelectableTreeNode[]): void;
    protected removeFocus(...nodes: (readonly SelectableTreeNode[])[]): void;
    protected addFocus(node: SelectableTreeNode | undefined): void;
    /**
     * Returns an array of the difference of two arrays. The returned array contains all elements that are contained by
     * `left` and not contained by `right`. `right` may also contain elements not present in `left`: these are simply ignored.
     */
    protected difference<T>(left: readonly T[], right: readonly T[]): readonly T[];
    /**
     * Returns a reference to the argument if the node exists in the tree. Otherwise, `undefined`.
     */
    protected validateNode(node: Readonly<TreeNode>): Readonly<TreeNode> | undefined;
    storeState(): TreeSelectionServiceImpl.State;
    restoreState(state: Record<string, any>): void;
}
export declare namespace TreeSelectionServiceImpl {
    type State = {
        selectionStack: readonly FocusableTreeSelectionState[];
    };
    type FocusableTreeSelectionState = {
        focus?: string | undefined;
        node?: string | undefined;
        type?: TreeSelection.SelectionType | undefined;
    };
}
//# sourceMappingURL=tree-selection-impl.d.ts.map