Function createTouchEvent

src/cdk/testing/testbed/fake-events/event-objects.ts:109–125

(type: string, pageX = 0, pageY = 0, clientX = 0, clientY = 0)

 * @docs-private
 */
export function createTouchEvent(type: string, pageX = 0, pageY = 0, clientX = 0, clientY = 0) {
  // We cannot use the `TouchEvent` or `Touch` because Firefox and Safari lack support.
  // TODO: Switch to the constructor API when it is available for Firefox and Safari.
  const event = document.createEvent('UIEvent');
  const touchDetails = {pageX, pageY, clientX, clientY, identifier: uniqueIds++};

  // TS3.6 removes the initUIEvent method and suggests porting to "new UIEvent()".
  (event as any).initUIEvent(type, true, true, window, 0);

  // Most of the browsers don't have a "initTouchEvent" method that can be used to define
  // the touch details.
  defineReadonlyEventProperty(event, 'touches', [touchDetails]);
  defineReadonlyEventProperty(event, 'targetTouches', [touchDetails]);
  defineReadonlyEventProperty(event, 'changedTouches', [touchDetails]);

  return event;
}

/**
 * Creates a keyboard event with the specified key and modifiers.