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import { Backend, DragDropManager, Unsubscribe } from 'dnd-core';
import { HTML5BackendContext } from './types';
declare global {
interface Window {
__isReactDndBackendSetUp: boolean | undefined;
}
}
export declare class HTML5BackendImpl implements Backend {
private options;
private actions;
private monitor;
private registry;
private enterLeaveCounter;
private sourcePreviewNodes;
private sourcePreviewNodeOptions;
private sourceNodes;
private sourceNodeOptions;
private dragStartSourceIds;
private dropTargetIds;
private dragEnterTargetIds;
private currentNativeSource;
private currentNativeHandle;
private currentDragSourceNode;
private altKeyPressed;
private mouseMoveTimeoutTimer;
private asyncEndDragFrameId;
private dragOverTargetIds;
constructor(manager: DragDropManager, globalContext?: HTML5BackendContext);
/**
* Generate profiling statistics for the HTML5Backend.
*/
profile(): Record<string, number>;
get window(): Window | undefined;
get document(): Document | undefined;
setup(): void;
teardown(): void;
connectDragPreview(sourceId: string, node: Element, options: any): Unsubscribe;
connectDragSource(sourceId: string, node: Element, options: any): Unsubscribe;
connectDropTarget(targetId: string, node: HTMLElement): Unsubscribe;
private addEventListeners;
private removeEventListeners;
private getCurrentSourceNodeOptions;
private getCurrentDropEffect;
private getCurrentSourcePreviewNodeOptions;
private getSourceClientOffset;
private isDraggingNativeItem;
private beginDragNativeItem;
private endDragNativeItem;
private isNodeInDocument;
private endDragIfSourceWasRemovedFromDOM;
private setCurrentDragSourceNode;
private clearCurrentDragSourceNode;
handleTopDragStartCapture: () => void;
handleDragStart(e: DragEvent, sourceId: string): void;
handleTopDragStart: (e: DragEvent) => void;
handleTopDragEndCapture: () => void;
handleTopDragEnterCapture: (e: DragEvent) => void;
handleDragEnter(e: DragEvent, targetId: string): void;
handleTopDragEnter: (e: DragEvent) => void;
handleTopDragOverCapture: () => void;
handleDragOver(e: DragEvent, targetId: string): void;
handleTopDragOver: (e: DragEvent) => void;
handleTopDragLeaveCapture: (e: DragEvent) => void;
handleTopDropCapture: (e: DragEvent) => void;
handleDrop(e: DragEvent, targetId: string): void;
handleTopDrop: (e: DragEvent) => void;
handleSelectStart: (e: DragEvent) => void;
}