Function triggerDrag

packages/vant/test/event.ts:59–94

(
  el:
    | VueWrapper<ComponentPublicInstance<any, any, any>>
    | DOMWrapper<Element>
    | HTMLElement,
  relativeX = 0,
  relativeY = 0,
  options: TriggerDragOptions = {
    simulateDesktop: true,
  },
)

// simulate drag gesture
export function triggerDrag(
  el:
    | VueWrapper<ComponentPublicInstance<any, any, any>>
    | DOMWrapper<Element>
    | HTMLElement,
  relativeX = 0,
  relativeY = 0,
  options: TriggerDragOptions = {
    simulateDesktop: true,
  },
) {
  let x = relativeX;
  let y = relativeY;
  let startX = 0;
  let startY = 0;
  if (relativeX < 0) {
    startX = Math.abs(relativeX);
    x = 0;
  }
  if (relativeY < 0) {
    startY = Math.abs(relativeY);
    y = 0;
  }
  trigger(el, 'touchstart', startX, startY);
  trigger(el, 'touchmove', x / 4, y / 4);
  trigger(el, 'touchmove', x / 3, y / 3);
  trigger(el, 'touchmove', x / 2, y / 2);
  trigger(el, 'touchmove', x, y);
  trigger(el, 'touchend', x, y);

  if (options.simulateDesktop) {
    trigger(el, 'click', x, y);
  }

  return nextTick();
}