import type { ITranslator } from '@jupyterlab/translation';
import type { Message } from '@lumino/messaging';
import { Widget } from '@lumino/widgets';
import type { FileBrowserModel } from './model';
/**
 * A class which hosts folder breadcrumbs.
 */
export declare class BreadCrumbs extends Widget {
    /**
     * Construct a new file browser crumb widget.
     *
     * @param options Constructor options.
     */
    constructor(options: BreadCrumbs.IOptions);
    /**
     * Handle the DOM events for the bread crumbs.
     *
     * @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 panel's DOM node. It should
     * not be called directly by user code.
     */
    handleEvent(event: Event): void;
    /**
     * Whether to show the full path in the breadcrumbs
     */
    get fullPath(): boolean;
    set fullPath(value: boolean);
    /**
     * Number of items to show on left of ellipsis
     */
    get minimumLeftItems(): number;
    set minimumLeftItems(value: number);
    /**
     * Number of items to show on right of ellipsis
     */
    get minimumRightItems(): number;
    set minimumRightItems(value: number);
    /**
     * Dispose of the resources held by the widget.
     */
    dispose(): void;
    /**
     * A message handler invoked on an `'after-attach'` message.
     */
    protected onAfterAttach(msg: Message): void;
    /**
     * A message handler invoked on a `'before-detach'` message.
     */
    protected onBeforeDetach(msg: Message): void;
    /**
     * A handler invoked on an `'update-request'` message.
     */
    protected onUpdateRequest(msg: Message): void;
    /**
     * Restore crumb focus after breadcrumb activation and invoke activation callback.
     */
    private _runPostActivationFocus;
    /**
     * Return breadcrumb segments in DOM order that participate in arrow-key focus.
     */
    private _getFocusableCrumbElements;
    /**
     * Roving tabindex: one segment is in tab order (`tabIndex` 0), the rest -1.
     */
    private _syncCrumbTabIndices;
    /**
     * Focus a crumb segment and make it the sole tab stop within the trail.
     */
    private _focusCrumb;
    /**
     * Focus the last segment in the trail (the current directory), for keyboard UX after navigation.
     */
    private _focusTrailingCrumb;
    /**
     * Walk from an event target to the nearest breadcrumb segment host, if any.
     */
    private _resolveCrumbFromEventTarget;
    /**
     * Whether a crumb corresponds to the current directory segment.
     */
    private _isCurrentDirectoryCrumb;
    /**
     * Navigate to the directory represented by a breadcrumb segment.
     */
    private _activateCrumbSegment;
    /**
     * Resolve the destination path for an activated breadcrumb segment.
     */
    private _destinationForCrumb;
    /**
     * Handle the `'keydown'` event for the widget.
     */
    private _evtKeyDown;
    /**
     * Handle the `'click'` event for the widget.
     */
    private _evtClick;
    /**
     * Handle the `'lm-dragenter'` event for the widget.
     */
    private _evtDragEnter;
    /**
     * Handle the `'lm-dragleave'` event for the widget.
     */
    private _evtDragLeave;
    /**
     * Handle the `'lm-dragover'` event for the widget.
     */
    private _evtDragOver;
    /**
     * Handle the `'lm-drop'` event for the widget.
     */
    private _evtDrop;
    /**
     * Get all breadcrumb elements that can be drop targets.
     */
    private _getBreadcrumbElements;
    /**
     * Handle resize events with throttling.
     */
    private _onResize;
    /**
     * Measure ALL breadcrumb item widths by rendering them off-screen.
     * This ensures we have accurate widths for every path segment,
     * including those currently hidden behind the ellipsis.
     */
    private _measureAllItemWidths;
    /**
     * Calculate adaptive left/right items based on available width.
     */
    private _calculateAdaptiveItems;
    /**
     * Enter edit mode: show the path input and hide the breadcrumb content.
     */
    enterEditMode(): void;
    /**
     * Move focus to the trailing breadcrumb segment.
     */
    focusLastCrumb(): void;
    /**
     * Exit edit mode and restore the breadcrumb display.
     */
    private _exitEditMode;
    /**
     * Handle the model's `refreshed` signal.
     * If we are in edit mode, dismiss it (the model path may have changed).
     */
    private _onModelRefreshed;
    protected translator: ITranslator;
    private _trans;
    private _model;
    private _hasPreferred;
    private _crumbs;
    private _fullPath;
    private _previousState;
    private _minimumLeftItems;
    private _minimumRightItems;
    private _resizeObserver;
    private _resizeThrottler;
    private _cachedWidths;
    private _lastRenderedWidth;
    private _isEditMode;
    private _lastPath;
    private _crumbContainer;
    private _crumbContent;
    private _pathNavigator;
    private _onPathEdited?;
    private _onPathActivated?;
    /**
     * After `cd()` rebuilds the trail, restore focus to the current-directory segment.
     */
    private _restoreBreadcrumbFocusAfterUpdate;
}
/**
 * The namespace for the `BreadCrumbs` class statics.
 */
export declare namespace BreadCrumbs {
    /**
     * An options object for initializing a bread crumb widget.
     */
    interface IOptions {
        /**
         * A file browser model instance.
         */
        model: FileBrowserModel;
        /**
         * The application language translator.
         */
        translator?: ITranslator;
        /**
         * Show the full file browser path in breadcrumbs
         */
        fullPath?: boolean;
        /**
         * Number of items to show on left of ellipsis
         */
        minimumLeftItems?: number;
        /**
         * Number of items to show on right of ellipsis
         */
        minimumRightItems?: number;
        /**
         * Callback invoked after path edit changes directory.
         */
        onPathEdited?: () => void;
        /**
         * Callback invoked after breadcrumb activation changes directory.
         */
        onPathActivated?: () => void;
    }
}