import { Message } from '../core/messaging';
import { ISignal } from '../core/signaling';
import { Panel, PanelLayout } from './panel';
import { ChildMessage, ResizeMessage, Widget } from './widget';
/**
 * A panel where visible widgets are stacked atop one another.
 *
 * #### Notes
 * This class provides a convenience wrapper around a [[StackedLayout]].
 */
export declare class StackedPanel extends Panel {
    /**
     * Construct a new stacked panel.
     *
     * @param options - The options for initializing the panel.
     */
    constructor(options?: StackedPanel.IOptions);
    /**
     * A signal emitted when a widget is removed from a stacked panel.
     */
    widgetRemoved: ISignal<StackedPanel, Widget>;
    /**
     * 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 `StackedPanel` class statics.
 */
export declare namespace StackedPanel {
    /**
     * An options object for creating a stacked panel.
     */
    interface IOptions {
        /**
         * The stacked layout to use for the stacked panel.
         *
         * The default is a new `StackedLayout`.
         */
        layout?: StackedLayout;
    }
}
/**
 * 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 {
    /**
     * 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 _dirty;
    private _box;
}