import { GcImageViewer } from '../GcImageViewer';
import { ViewerOptions } from '../ViewerOptions';
export declare class KeyboardWorker {
    private readonly _viewer;
    options: Partial<ViewerOptions>;
    private _windowHandlers;
    private _topWindowHandlers;
    private _eventBusHandlers;
    private _shiftKeyPressedFlag;
    constructor(_viewer: GcImageViewer, options: Partial<ViewerOptions>);
    dispose(): void;
    applyOptions(options?: Partial<ViewerOptions> | null): void;
    tool_zoomPageWidth(): boolean;
    tool_zoomActualSize(): boolean;
    tool_zoomIn(): boolean;
    tool_zoomOut(): boolean;
    tool_print(): boolean;
    tool_undo(): boolean;
    tool_redo(): boolean;
    tool_open(): boolean;
    tool_save(): boolean;
    tool_rotate(): boolean;
    tool_rotateBackward(): boolean;
    tool_confirmChanges(): void;
    tool_cancelChanges(): void;
    handleShortcut(e: KeyboardEvent): any;
    private _bindWindowEvents;
    private _unbindWindowEvents;
    private _bindEventBusEvents;
    private _unbindEventBusEvents;
    onWindowKeyDown(event: KeyboardEvent): boolean;
    onWindowKeyUp(event: KeyboardEvent): boolean;
    onTopWindowKeyDown(event: KeyboardEvent): void;
    onTopWindowKeyUp(event: KeyboardEvent): void;
    _handleShiftKey(shiftKeyPressed: boolean): void;
}