import { Widget } from '@lumino/widgets';
import { Message } from '@lumino/messaging';
import { GridStackModel } from './model';
/**
 * A gridstack widget to host the visible Notebook's Cells.
 */
export declare class GridStackWidget extends Widget {
    /**
     * Construct a `GridStackWidget`.
     *
     * @param model - The `GridStackModel`.
     */
    constructor(model: GridStackModel);
    /**
     * Update the layout to reclaim any empty space
     */
    compact(): void;
    /**
     * Dispose of the resources held by the widget.
     */
    dispose(): void;
    /**
     * Handle `after-attach` messages sent to the widget.
     *
     * ### Note
     * Add event listeners for the drag and drop event.
     */
    protected onAfterAttach(msg: Message): void;
    /**
     * Handle `before-detach` messages sent to the widget.
     *
     * ### Note
     * Remove event listeners for the drag and drop event.
     */
    protected onBeforeDetach(msg: Message): void;
    /**
     * Handle event messages sent to the widget.
     *
     * ### Note
     * Calling the pertinent function depending on the drag and drop stage.
     */
    handleEvent(event: Event): void;
    /**
     * Getter to acces the list of `GridstackItemWidget`.
     */
    get gridWidgets(): Widget[];
    /**
     * Launch the `DashboardMetadataEditor`.
     */
    infoEditor(): void;
    /**
     * Initialize the `GridstackItemWidget` from Notebook's metadata.
     */
    private _initGridItems;
    /**
     * A handler invoked when a grid item has to be removed.
     *
     * @param model - The `GridstackModel` that sends the signal.
     * @param id - The Cell id.
     */
    private _removeCell;
    /**
     * A handler invoked when a grid item has to be removed.
     *
     * @param model - The `GridstackModel` that sends the signal.
     * @param id - The Cell id.
     */
    private _lockCell;
    /**
     * Update the `GridstackItemWidget` from Notebook's metadata.
     */
    private _updateGridItems;
    /**
     * A signal handler invoked when a grid item change.
     *
     * @param sender - The `GridStackLayout` that sends the signal.
     * @param items - The list of `GridStackNode`.
     */
    private _onGridItemChange;
    /**
     * 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;
    /**
     * Whether the dragged element is droppable or not
     *
     * @param event Event object
     * @returns Whether the element can be dropped and the reason why it can't
     */
    private _isDroppable;
    private _scrollIfNeeded;
    /**
     * Test if the mouse pointer for the event occurs within the widget
     */
    private _isPointerOnWidget;
    /**
     * Remove the shadow widget and activate the events on the grid
     */
    private _resetShadowWidget;
    private _setErrorMessage;
    private _gridLayout;
    private _model;
    private _shadowWidget;
    private _scrollIntervalId;
}