import { Message } from '../core/messaging';
import { Panel, PanelLayout } from './panel';
import { ChildMessage, ResizeMessage, Widget } from './widget';
/**
 * A panel which arranges its widgets in a single row or column.
 *
 * #### Notes
 * This class provides a convenience wrapper around a [[BoxLayout]].
 */
export declare class BoxPanel extends Panel {
    /**
     * Construct a new box panel.
     *
     * @param options - The options for initializing the box panel.
     */
    constructor(options?: BoxPanel.IOptions);
    /**
     * Get the layout direction for the box panel.
     */
    /**
     * Set the layout direction for the box panel.
     */
    direction: BoxPanel.Direction;
    /**
     * Get the inter-element spacing for the box panel.
     */
    /**
     * Set the inter-element spacing for the box panel.
     */
    spacing: number;
    /**
     * A message handler invoked on a `'child-added'` message.
     */
    protected onChildAdded(msg: ChildMessage): void;
    /**
     * A message handler invoked on a `'child-removed'` message.
     */
    protected onChildRemoved(msg: ChildMessage): void;
}
/**
 * The namespace for the `BoxPanel` class statics.
 */
export declare namespace BoxPanel {
    /**
     * A type alias for a box panel direction.
     */
    type Direction = BoxLayout.Direction;
    /**
     * An options object for initializing a box panel.
     */
    interface IOptions {
        /**
         * The layout direction of the panel.
         *
         * The default is `'top-to-bottom'`.
         */
        direction?: Direction;
        /**
         * The spacing between items in the panel.
         *
         * The default is `4`.
         */
        spacing?: number;
        /**
         * The box layout to use for the box panel.
         *
         * If this is provided, the other options are ignored.
         *
         * The default is a new `BoxLayout`.
         */
        layout?: BoxLayout;
    }
    /**
     * Get the box panel stretch factor for the given widget.
     *
     * @param widget - The widget of interest.
     *
     * @returns The box panel stretch factor for the widget.
     */
    function getStretch(widget: Widget): number;
    /**
     * Set the box panel stretch factor for the given widget.
     *
     * @param widget - The widget of interest.
     *
     * @param value - The value for the stretch factor.
     */
    function setStretch(widget: Widget, value: number): void;
    /**
     * Get the box panel size basis for the given widget.
     *
     * @param widget - The widget of interest.
     *
     * @returns The box panel size basis for the widget.
     */
    function getSizeBasis(widget: Widget): number;
    /**
     * Set the box panel size basis for the given widget.
     *
     * @param widget - The widget of interest.
     *
     * @param value - The value for the size basis.
     */
    function setSizeBasis(widget: Widget, value: number): void;
}
/**
 * A layout which arranges its widgets in a single row or column.
 */
export declare class BoxLayout extends PanelLayout {
    /**
     * Construct a new box layout.
     *
     * @param options - The options for initializing the layout.
     */
    constructor(options?: BoxLayout.IOptions);
    /**
     * Get the layout direction for the box layout.
     */
    /**
     * Set the layout direction for the box layout.
     */
    direction: BoxLayout.Direction;
    /**
     * Get the inter-element spacing for the box layout.
     */
    /**
     * Set the inter-element spacing for the box layout.
     */
    spacing: number;
    /**
     * Perform layout initialization which requires the parent widget.
     */
    protected init(): void;
    /**
     * Attach a widget to the parent's DOM node.
     *
     * @param index - The current index of the widget in the layout.
     *
     * @param widget - The widget to attach to the parent.
     *
     * #### Notes
     * This is a reimplementation of the superclass method.
     */
    protected attachWidget(index: number, widget: Widget): void;
    /**
     * Move a widget in the parent's DOM node.
     *
     * @param fromIndex - The previous index of the widget in the layout.
     *
     * @param toIndex - The current index of the widget in the layout.
     *
     * @param widget - The widget to move in the parent.
     *
     * #### Notes
     * This is a reimplementation of the superclass method.
     */
    protected moveWidget(fromIndex: number, toIndex: number, widget: Widget): void;
    /**
     * Detach a widget from the parent's DOM node.
     *
     * @param index - The previous index of the widget in the layout.
     *
     * @param widget - The widget to detach from the parent.
     *
     * #### Notes
     * This is a reimplementation of the superclass method.
     */
    protected detachWidget(index: number, widget: Widget): void;
    /**
     * A message handler invoked on an `'after-show'` message.
     */
    protected onAfterShow(msg: Message): void;
    /**
     * A message handler invoked on an `'after-attach'` message.
     */
    protected onAfterAttach(msg: Message): void;
    /**
     * A message handler invoked on a `'child-shown'` message.
     */
    protected onChildShown(msg: ChildMessage): void;
    /**
     * A message handler invoked on a `'child-hidden'` message.
     */
    protected onChildHidden(msg: ChildMessage): void;
    /**
     * A message handler invoked on a `'resize'` message.
     */
    protected onResize(msg: ResizeMessage): void;
    /**
     * A message handler invoked on an `'update-request'` message.
     */
    protected onUpdateRequest(msg: Message): void;
    /**
     * A message handler invoked on a `'fit-request'` message.
     */
    protected onFitRequest(msg: Message): void;
    /**
     * Fit the layout to the total size required by the widgets.
     */
    private _fit();
    /**
     * Update the layout position and size of the widgets.
     *
     * The parent offset dimensions should be `-1` if unknown.
     */
    private _update(offsetWidth, offsetHeight);
    private _fixed;
    private _spacing;
    private _dirty;
    private _box;
    private _sizers;
    private _direction;
}
/**
 * The namespace for the `BoxLayout` class statics.
 */
export declare namespace BoxLayout {
    /**
     * A type alias for a box layout direction.
     */
    type Direction = ('left-to-right' | 'right-to-left' | 'top-to-bottom' | 'bottom-to-top');
    /**
     * An options object for initializing a box layout.
     */
    interface IOptions {
        /**
         * The direction of the layout.
         *
         * The default is `'top-to-bottom'`.
         */
        direction?: Direction;
        /**
         * The spacing between items in the layout.
         *
         * The default is `4`.
         */
        spacing?: number;
    }
    /**
     * Get the box layout stretch factor for the given widget.
     *
     * @param widget - The widget of interest.
     *
     * @returns The box layout stretch factor for the widget.
     */
    function getStretch(widget: Widget): number;
    /**
     * Set the box layout stretch factor for the given widget.
     *
     * @param widget - The widget of interest.
     *
     * @param value - The value for the stretch factor.
     */
    function setStretch(widget: Widget, value: number): void;
    /**
     * Get the box layout size basis for the given widget.
     *
     * @param widget - The widget of interest.
     *
     * @returns The box layout size basis for the widget.
     */
    function getSizeBasis(widget: Widget): number;
    /**
     * Set the box layout size basis for the given widget.
     *
     * @param widget - The widget of interest.
     *
     * @param value - The value for the size basis.
     */
    function setSizeBasis(widget: Widget, value: number): void;
}