import { ExtractableWidget, Widget } from './widgets';
import { MessageService } from '../common/message-service';
import { ApplicationShell } from './shell/application-shell';
import { Emitter } from '../common/event';
import { SecondaryWindowService } from './window/secondary-window-service';
import { KeybindingRegistry } from './keybinding';
/**
 * Offers functionality to move a widget out of the main window to a newly created window.
 * Widgets must explicitly implement the `ExtractableWidget` interface to support this.
 *
 * This handler manages the opened secondary windows and sets up messaging between them and the Theia main window.
 * In addition, it provides access to the extracted widgets and provides notifications when widgets are added to or removed from this handler.
 *
 */
export declare class SecondaryWindowHandler {
    /** List of widgets in secondary windows. */
    protected readonly _widgets: ExtractableWidget[];
    protected applicationShell: ApplicationShell;
    protected keybindings: KeybindingRegistry;
    protected readonly onWillAddWidgetEmitter: Emitter<[Widget, Window]>;
    /** Subscribe to get notified when a widget is added to this handler, i.e. the widget was moved to an secondary window . */
    readonly onWillAddWidget: import("../common/event").Event<[Widget, Window]>;
    protected readonly onDidAddWidgetEmitter: Emitter<[Widget, Window]>;
    /** Subscribe to get notified when a widget is added to this handler, i.e. the widget was moved to an secondary window . */
    readonly onDidAddWidget: import("../common/event").Event<[Widget, Window]>;
    protected readonly onWillRemoveWidgetEmitter: Emitter<[Widget, Window]>;
    /** Subscribe to get notified when a widget is removed from this handler, i.e. the widget's window was closed or the widget was disposed. */
    readonly onWillRemoveWidget: import("../common/event").Event<[Widget, Window]>;
    protected readonly onDidRemoveWidgetEmitter: Emitter<[Widget, Window]>;
    /** Subscribe to get notified when a widget is removed from this handler, i.e. the widget's window was closed or the widget was disposed. */
    readonly onDidRemoveWidget: import("../common/event").Event<[Widget, Window]>;
    protected readonly messageService: MessageService;
    protected readonly secondaryWindowService: SecondaryWindowService;
    /** @returns List of widgets in secondary windows. */
    get widgets(): ReadonlyArray<Widget>;
    /**
     * Sets up message forwarding from the main window to secondary windows.
     * Does nothing if this service has already been initialized.
     *
     * @param shell The `ApplicationShell` that widgets will be moved out from.
     */
    init(shell: ApplicationShell): void;
    /**
     *  Moves the given widget to a new window.
     *
     * @param widget the widget to extract
     */
    moveWidgetToSecondaryWindow(widget: ExtractableWidget): void;
    /**
     * If the given widget is tracked by this handler, activate it and focus its secondary window.
     *
     * @param widgetId The widget to activate specified by its id
     * @returns The activated `ExtractableWidget` or `undefined` if the given widget id is unknown to this handler.
     */
    activateWidget(widgetId: string): ExtractableWidget | undefined;
    /**
     * If the given widget is tracked by this handler, reveal it by focussing its secondary window.
     *
     * @param widgetId The widget to reveal specified by its id
     * @returns The revealed `ExtractableWidget` or `undefined` if the given widget id is unknown to this handler.
     */
    revealWidget(widgetId: string): ExtractableWidget | undefined;
    protected addWidget(widget: ExtractableWidget, win: Window): void;
    protected removeWidget(widget: ExtractableWidget, win: Window): void;
}
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