import { Message } from '@phosphor/messaging';
import { PanelLayout } from './panellayout';
import { Widget } from './widget';
/**
 * A layout where visible widgets are stacked atop one another.
 *
 * #### Notes
 * The Z-order of the visible widgets follows their layout order.
 */
export declare class StackedLayout extends PanelLayout {
    /**
     * Dispose of the resources held by the layout.
     */
    dispose(): 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 a `'before-show'` message.
     */
    protected onBeforeShow(msg: Message): void;
    /**
     * A message handler invoked on a `'before-attach'` message.
     */
    protected onBeforeAttach(msg: Message): void;
    /**
     * A message handler invoked on a `'child-shown'` message.
     */
    protected onChildShown(msg: Widget.ChildMessage): void;
    /**
     * A message handler invoked on a `'child-hidden'` message.
     */
    protected onChildHidden(msg: Widget.ChildMessage): void;
    /**
     * A message handler invoked on a `'resize'` message.
     */
    protected onResize(msg: Widget.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;
    private _dirty;
    private _items;
    private _box;
}