import { ElementRef, TemplateRef, OnInit, OnChanges, OnDestroy } from '@angular/core';
import { GanttItemInternal } from './class';
import { Subject } from 'rxjs';
import { GanttUpper } from './gantt-upper';
import * as i0 from "@angular/core";
export declare abstract class GanttItemUpper implements OnChanges, OnInit, OnDestroy {
    protected elementRef: ElementRef<HTMLElement>;
    protected ganttUpper: GanttUpper;
    template: TemplateRef<any>;
    item: GanttItemInternal;
    firstChange: boolean;
    unsubscribe$: Subject<void>;
    constructor(elementRef: ElementRef<HTMLElement>, ganttUpper: GanttUpper);
    ngOnInit(): void;
    ngOnChanges(): void;
    private setPositions;
    ngOnDestroy(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<GanttItemUpper, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<GanttItemUpper, never, never, { "template": "template"; "item": "item"; }, {}, never>;
}