import { Message } from 'phosphor-messaging';
import { ISignal } from 'phosphor-signaling';
import { Widget } from 'phosphor-widget';
import { ICompletionModel, ICompletionItem } from './model';
/**
 * A widget that enables text completion.
 */
export declare class CompletionWidget extends Widget {
    /**
     * Create the DOM node for a text completion menu.
     */
    static createNode(): HTMLElement;
    /**
     * Construct a text completion menu widget.
     */
    constructor(options?: CompletionWidget.IOptions);
    /**
     * A signal emitted when a selection is made from the completion menu.
     */
    selected: ISignal<CompletionWidget, string>;
    /**
     * A signal emitted when the completion widget's visibility changes.
     *
     * #### Notes
     * This signal is useful when there are multiple floating widgets that may
     * contend with the same space and ought to be mutually exclusive.
     */
    visibilityChanged: ISignal<CompletionWidget, void>;
    /**
     * The model used by the completion widget.
     *
     * #### Notes
     * This is a read-only property.
     */
    model: ICompletionModel;
    /**
     * The semantic parent of the completion widget, its anchor element. An
     * event listener will peg the position of the completion widget to the
     * anchor element's scroll position. Other event listeners will guarantee
     * the completion widget behaves like a child of the reference element even
     * if it does not appear as a descendant in the DOM.
     */
    anchor: HTMLElement;
    /**
     * Dispose of the resources held by the completion widget.
     */
    dispose(): void;
    /**
     * Reset the widget.
     */
    reset(): void;
    /**
     * Handle the DOM events for the widget.
     *
     * @param event - The DOM event sent to the widget.
     *
     * #### Notes
     * This method implements the DOM `EventListener` interface and is
     * called in response to events on the dock panel's node. It should
     * not be called directly by user code.
     */
    handleEvent(event: Event): void;
    /**
     * Handle `after_attach` messages for the widget.
     */
    protected onAfterAttach(msg: Message): void;
    /**
     * Handle `before_detach` messages for the widget.
     */
    protected onBeforeDetach(msg: Message): void;
    /**
     * Handle model state changes.
     */
    protected onModelStateChanged(): void;
    /**
     * Handle `update_request` messages.
     */
    protected onUpdateRequest(msg: Message): void;
    /**
     * Cycle through the available completion items.
     */
    private _cycle(direction);
    /**
     * Handle keydown events for the widget.
     */
    private _evtKeydown(event);
    /**
     * Handle mousedown events for the widget.
     */
    private _evtMousedown(event);
    /**
     * Handle scroll events for the widget
     */
    private _evtScroll(event);
    /**
     * Populate the completion up to the longest initial subset of items.
     *
     * @returns `true` if a subset match was found and populated.
     */
    private _populateSubset();
    /**
     * Set the visible dimensions of the widget.
     */
    private _setGeometry();
    /**
     * Emit the selected signal for the current active item and reset.
     */
    private _selectActive();
    private _anchor;
    private _anchorPoint;
    private _activeIndex;
    private _model;
    private _renderer;
}
export declare namespace CompletionWidget {
    /**
     * The initialization options for a completion widget.
     */
    interface IOptions {
        /**
         * The model for the completion widget.
         */
        model?: ICompletionModel;
        /**
         * The semantic parent of the completion widget, its anchor element. An
         * event listener will peg the position of the completion widget to the
         * anchor element's scroll position. Other event listeners will guarantee
         * the completion widget behaves like a child of the reference element even
         * if it does not appear as a descendant in the DOM.
         */
        anchor?: HTMLElement;
        /**
         * The renderer for the completion widget nodes.
         */
        renderer?: IRenderer;
    }
    /**
     * A renderer for completion widget nodes.
     */
    interface IRenderer {
        /**
         * Create an item node (an `li` element) for a text completion menu.
         */
        createItemNode(item: ICompletionItem): HTMLLIElement;
    }
    /**
     * The default implementation of an `IRenderer`.
     */
    class Renderer implements IRenderer {
        /**
         * Create an item node for a text completion menu.
         */
        createItemNode(item: ICompletionItem): HTMLLIElement;
    }
    /**
     * The default `IRenderer` instance.
     */
    const defaultRenderer: Renderer;
}