SwipeableRow.js

_handlePanResponderMove(event: Object, gestureState: Object): void {
  if (this._isSwipingExcessivelyRightFromClosedPosition(gestureState)) {
    return;
  }
  this.props.onSwipeStart();
  if (this._isSwipingRightFromClosed(gestureState)) {
    this._swipeSlowSpeed(gestureState);
  } else {
    this._swipeFullSpeed(gestureState);
  }
},

_isSwipingRightFromClosed(gestureState: Object): boolean {
  const gestureStateDx = IS_RTL ? -gestureState.dx : gestureState.dx;
  return this._previousLeft === CLOSED_LEFT_POSITION && gestureStateDx > 0;
},

_swipeFullSpeed(gestureState: Object): void {
  this.state.currentLeft.setValue(this._previousLeft + gestureState.dx);
},

_swipeSlowSpeed(gestureState: Object): void {
  this.state.currentLeft.setValue(
    this._previousLeft + gestureState.dx / SLOW_SPEED_SWIPE_FACTOR,
  );
},

_isSwipingExcessivelyRightFromClosedPosition(gestureState: Object): boolean {
  const gestureStateDx = IS_RTL ? -gestureState.dx : gestureState.dx;
  return (
    this._isSwipingRightFromClosed(gestureState) &&
    gestureStateDx > RIGHT_SWIPE_THRESHOLD
  );
},