import { Views } from '@singularsystems/neo-core';
import { RoutingState } from './RoutingState';
import { IViewBase } from "../Views/ViewBase";
import { IRouteChangedProps, RouteChangedLeavePrompt } from "./IRouteChangedProps";
export interface IPageLeaveHandler {
    /**
     * Called after `ViewBase.beforeRouteChanged` and `ViewBase.onLeave` are called.
     * @param changeProps
     */
    beforeLeavePage(changeProps: IRouteChangedProps): void;
    /**
     * Called when the user tries to leave the page, and the page / leave handler has indicated the user must be prompted.
     * @returns A boolean promise with a value indicating whether the user wants to leave the page.
     */
    onLeavePage(view: Views.IViewBase | null, leavePrompt: RouteChangedLeavePrompt): Promise<boolean>;
    /**
     * Called when the windows beforeunload event fires, and the page / leave handler has indicated the user must be prompted.
     * @param view The currently active view.
     * @param e beforeunload event.
     */
    onWindowUnload(view: IViewBase | null, leavePrompt: RouteChangedLeavePrompt, e: BeforeUnloadEvent): void;
}
export declare class PageLeaveHandler implements IPageLeaveHandler {
    private routingState;
    constructor(routingState: RoutingState);
    beforeLeavePage(changeProps: IRouteChangedProps): void;
    onLeavePage(view: Views.IViewBase | null, leavePrompt: RouteChangedLeavePrompt): Promise<boolean>;
    onWindowUnload(view: Views.IViewBase | null, leavePrompt: RouteChangedLeavePrompt, e: BeforeUnloadEvent): void;
    protected showDefaultConfirmation(view: Views.IViewBase | null, prompt: string): Promise<boolean>;
}