import { IObservable, IObservableArrayEventArgs, ObservableArrayAction } from '../Core/Observable';
import { IDropdownPivot } from '../Dropdown';
import { IListBoxItem } from '../ListBox';
import { IItemProvider } from '../Utilities/Provider';
export declare class PivotItemProvider<T = {}> implements IItemProvider<IListBoxItem<T>>, IObservable<IObservableArrayEventArgs<IListBoxItem<T>>, ObservableArrayAction> {
    private listItems;
    private internalPivots;
    /**
     * Create a Provider that arranges IListBoxItems in different pivots.
     * @param pivots
     */
    constructor(pivots: IDropdownPivot<T>[]);
    /**
     * Get the array of pivots.
     */
    readonly pivots: IDropdownPivot<T>[];
    /**
     * Get the length of the listItems array.
     */
    readonly length: number;
    /**
     * Get the interal array of listItems.
     */
    readonly value: IListBoxItem<T>[];
    /**
     * Subscribe to changes in the underlying set of items.
     * @param observer the delegate to be called when there are updates.
     * @param action the action on the set to observe.
     */
    subscribe(observer: (value: IObservableArrayEventArgs<IListBoxItem<T>>, action?: ObservableArrayAction) => void, action?: ObservableArrayAction): void;
    /**
     * Unsubscribe from changes in the underlying set of items.
     * @param observer the delegate that was used to subscribe.
     * @param action the action that was used to subsribe.
     */
    unsubscribe(observer: (value: IObservableArrayEventArgs<IListBoxItem<T>>, action?: ObservableArrayAction) => void, action?: ObservableArrayAction): void;
    /**
     * Add items to the end of whichever pivot they belong to.
     * @param pivotId the id of the pivot to operate on.
     * @param items a list of items to add.
     */
    push(pivotId: string, ...items: IListBoxItem<T>[]): number;
    /**
     * Remove the last item in the pivot's item set and return it.
     * @param pivotId the id of the pivot to operate on.
     */
    pop(pivotId: string): IListBoxItem<T> | undefined;
    /**
     * Remove all items that match the given filter from a pivot's item set.
     * @param pivotId the id of the pivot to operate on.
     * @param filter the filter function to run on all items.  If this returns true, the item will be deleted.
     */
    removeAll(pivotId: string, filter?: (item: IListBoxItem<T>) => boolean): IListBoxItem<T>[];
    /**
     * Remove and add items from a pivot's item set using a provided index.
     * @param pivotId the id of the pivot to operate on.
     * @param start the index to start insertion and deletion.
     * @param deleteCount the number of items to delete.
     * @param itemsToAdd the items to insert at the start index.
     */
    splice(pivotId: string, start: number, deleteCount: number, ...itemsToAdd: IListBoxItem<T>[]): IListBoxItem<T>[];
}