import { Offset } from './type-ish';
/** The methods common to all monitor classes. */
export interface MonitorBase<Item> {
    /** The type of the item in transit. Returns `null` if no item is being dragged. */
    getItemType(): string | symbol | null;
    /**
     * The item in transit, if any. This is what you returned from
     * {@link DragSourceSpec#beginDrag}. Returns `null` if no item is being dragged.
     */
    getItem(): Item | null;
    /**
     * The initial mouse x,y position relative to the viewport, when the current
     * drag operation started. Returns `null` if no item is being dragged.
     */
    getInitialClientOffset(): Offset | null;
    /**
     * x,y relative to viewport of the item's DOM element before it was dragged.
     * Returns `null` if no item is being dragged.
     */
    getInitialSourceClientOffset(): Offset | null;
    /**
     * The current mouse x,y position relative to the viewport. Returns `null`
     * if no item is being dragged.
     */
    getClientOffset(): Offset | null;
    /**
     * A vector x,y of the displacement of the dragged item from its initial
     * position. Returns `null` if no item is being dragged.
     */
    getDifferenceFromInitialOffset(): Offset | null;
    /**
     * The projected x,y position relative to viewport of the root DOM element of the drag source
     * = its initial position + displacement. Returns `null` if no item is being dragged.
     */
    getSourceClientOffset(): Offset | null;
}