Function eventShouldStartDrag

packages/backend-touch/src/utils/predicates.ts:19–23

(e: MouseEvent)

 * @param {MouseEvent | TouchEvent} e The event
 */
export function eventShouldStartDrag(e: MouseEvent): boolean {
	// For touch events, button will be undefined. If e.button is defined,
	// then it should be MouseButton.Left.
	return e.button === undefined || e.button === MouseButton.Left
}

/**
 * Only touch events and mouse events where the left mouse button is no longer held should end a drag.