import { ComputedRef, MaybeRefOrGetter } from 'vue';
import { TreeViewSelectionMode, ITreeNode, TreeViewVisibleNode } from '@wolf-tui/shared';
export interface IUseTreeViewStateProps {
    /**
     * Tree data. Accepts plain value, ref, or getter for reactivity.
     */
    data: MaybeRefOrGetter<ITreeNode[]>;
    /**
     * Selection mode.
     *
     * @default 'none'
     */
    selectionMode?: TreeViewSelectionMode;
    /**
     * Default expanded node IDs.
     */
    defaultExpanded?: ReadonlySet<string> | 'all';
    /**
     * Default selected node IDs.
     */
    defaultSelected?: ReadonlySet<string>;
    /**
     * Number of visible nodes.
     *
     * @default Infinity
     */
    visibleNodeCount?: number;
    /**
     * Callback when selection changes.
     */
    onSelect?: (selectedIds: ReadonlySet<string>) => void;
    /**
     * Callback when focused node changes.
     */
    onFocusChange?: (focusedId: string | undefined) => void;
    /**
     * Callback to load children for a node (async tree).
     */
    loadChildren?: (nodeId: string) => Promise<ITreeNode[]>;
}
export interface ITreeViewState {
    viewportNodes: ComputedRef<TreeViewVisibleNode[]>;
    selectionMode: TreeViewSelectionMode;
    focusedId: ComputedRef<string | undefined>;
    selectedIds: ComputedRef<ReadonlySet<string>>;
    hasScrollUp: ComputedRef<boolean>;
    hasScrollDown: ComputedRef<boolean>;
    scrollUpCount: ComputedRef<number>;
    scrollDownCount: ComputedRef<number>;
    focusNext: () => void;
    focusPrevious: () => void;
    focusFirst: () => void;
    focusLast: () => void;
    expand: () => void;
    collapse: () => void;
    toggleExpand: () => void;
    expandAll: () => void;
    collapseAll: () => void;
    select: () => void;
    focusParent: () => void;
    focusFirstChild: () => void;
}
export declare const useTreeViewState: ({ data: dataProp, selectionMode, defaultExpanded, defaultSelected, visibleNodeCount, onSelect, onFocusChange, loadChildren, }: IUseTreeViewStateProps) => ITreeViewState;
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