isSecondPointerAllowed method

@override bool isSecondPointerAllowed(PointerEvent event)

Implementation

@override
bool isSecondPointerAllowed(PointerEvent event) {
  if (_initialButtons == null) {
    switch (event.buttons) {
      case kPrimaryButton:
        if (onDown == null && onStart == null && onUpdate == null && onEnd == null && onCancel == null) {
          return false;
        }
        break;
      default:
        return false;
    }
  } else {
    // There can be multiple drags simultaneously. Their effects are combined.
    if (event.buttons != _initialButtons) {
      return false;
    }
  }
  return super.isSecondPointerAllowed(event);
}