import { utils } from "pixi.js";
import { DOnOptions } from "./d-on-options";
import { DTreeNode } from "./d-tree-node";
/**
 * {@link DTreeDataSelection} type.
 */
export declare const DTreeDataSelectionType: {
    readonly NONE: 0;
    readonly SINGLE: 1;
    readonly MULTIPLE: 2;
};
export type DTreeDataSelectionType = (typeof DTreeDataSelectionType)[keyof typeof DTreeDataSelectionType];
/**
 * {@link DTreeDataSelection} events.
 */
export interface DTreeDataSelectionEvents<EMITTER> {
    /**
     * Triggered when a selection is changed.
     *
     * @param emitter an emitter
     */
    change(emitter: EMITTER): void;
}
/**
 * {@link DTreeDataSelection} "on" options.
 */
export interface DTreeDataSelectionOnOptions<EMITTER> extends Partial<DTreeDataSelectionEvents<EMITTER>>, DOnOptions {
}
/**
 * {@link DTreeDataSelection} options.
 */
export interface DTreeDataSelectionOptions<ITEM, EMITTER = any> {
    /**
     * A type.
     */
    type?: DTreeDataSelectionType | keyof typeof DTreeDataSelectionType;
    /**
     * Mappings of event names and handlers.
     */
    on?: DTreeDataSelectionOnOptions<EMITTER>;
}
export interface DTreeDataSelection<NODE extends DTreeNode> extends utils.EventEmitter {
    /**
     * A type.
     */
    readonly type: DTreeDataSelectionType;
    /**
     * A first selected node or null.
     */
    readonly first: NODE | null;
    /**
     * A last selected node or null.
     */
    readonly last: NODE | null;
    /**
     * Returns a node at the given index or null.
     *
     * @param index an index
     * @returns a node at the given index or null
     */
    get(index: number): NODE | null;
    /**
     * Adds the given node
     *
     * @param target a node
     * @return true if succeeded.
     */
    add(target: NODE): boolean;
    /**
     * Removes the given node.
     *
     * @param target a node
     * @return true if succeeded
     */
    remove(target: NODE): boolean;
    /**
     * Toggles the given node.
     *
     * @param target a node
     * @return true if succeeded.
     */
    toggle(target: NODE): boolean;
    /**
     * Clears all the nodes.
     */
    clear(): boolean;
    /**
     * Clears all the exisint nodes and adds the given node.
     *
     * @param target a node to be added
     * @returns true if the selection is changed
     */
    clearAndAdd(target: NODE): boolean;
    /**
     * Clears the exising nodes and add all the given nodes.
     *
     * @param targets nodes to be added
     * @returns true if the selection is changed
     */
    clearAndAddAll(targets: NODE[]): boolean;
    /**
     * Returns true if the given node is selected.
     *
     * @param target a node to be checked
     * @returns true if the given node is selected
     */
    contains(target: NODE): boolean;
    /**
     * Returns the number of selected nodes.
     *
     * @returns the number of selected nodes
     */
    size(): number;
    /**
     * Returns true if the selection is empty.
     *
     * @returns true if the selection is empty
     */
    isEmpty(): boolean;
    /**
     * Iterates over selected nodes.
     *
     * @param iteratee an iteratee
     */
    each(iteratee: (node: NODE) => boolean | void): void;
    /**
     * Returns an array of selected nodes.
     *
     * @return an array of selected nodes.
     */
    toArray(): NODE[];
}