import { OnChanges, SimpleChanges, EventEmitter } from '@angular/core';
export interface NavItem {
    id: string;
    text: string;
    image: string;
}
export declare class BlockNavComponent implements OnChanges {
    navData: NavItem[];
    initialNavId: string;
    navChange: EventEmitter<any>;
    activeNavId: string;
    mousedownId: string;
    ngOnChanges(changes: SimpleChanges): void;
    /**
     * 设定初始值并抛出导航变更事件
     */
    private initialActiveNavId;
    handleNavItemClick(itemId: string): void;
    handleMouseout(itemId: string): void;
    handleMousedown(itemId: string): void;
    handleMouseup(): void;
    imageDragstart(): boolean;
}