All files / packages/tools/src/eventListeners/wheel wheelListener.ts

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import { getEnabledElement, triggerEvent } from '@cornerstonejs/core';
import normalizeWheel from './normalizeWheel';
import Events from '../../enums/Events';
// ~~ VIEWPORT LIBRARY
import getMouseEventPoints from '../mouse/getMouseEventPoints';
import { MouseWheelEventDetail } from '../../types/EventTypes';
 
/**
 * wheelListener - Captures and normalizes mouse wheel events. Emits as a
 * cornerstoneTools3D mouse wheel event.
 * @param evt - The mouse wheel event.
 */
function wheelListener(evt: WheelEvent) {
  const element = <HTMLDivElement>evt.currentTarget;
  const enabledElement = getEnabledElement(element);
  const { renderingEngineId, viewportId } = enabledElement;
 
  // Prevent triggering MouseWheel events that are not real scroll events:
  // E.g. when clicking the MiddleMouseWheelButton, a deltaY of 0 is emitted.
  // See https://github.com/cornerstonejs/cornerstoneTools/issues/935
  Iif (evt.deltaY > -1 && evt.deltaY < 1) {
    return;
  }
 
  evt.preventDefault();
 
  const { spinX, spinY, pixelX, pixelY } = normalizeWheel(evt);
  const direction = spinY < 0 ? -1 : 1;
 
  const eventDetail: MouseWheelEventDetail = {
    event: evt,
    eventName: Events.MOUSE_WHEEL,
    renderingEngineId,
    viewportId,
    element,
    camera: {},
    detail: evt,
    wheel: {
      spinX,
      spinY,
      pixelX,
      pixelY,
      direction,
    },
    points: getMouseEventPoints(evt),
  };
 
  triggerEvent(element, Events.MOUSE_WHEEL, eventDetail);
}
 
export default wheelListener;