private void onActionDown(float x, float y) {
    mMoveHandler = mCropWindowHandler.getMoveHandler(x, y, mTouchRadius, mCropShape);
    if (mMoveHandler != null) {
      invalidate();
    }
  }
On press down start crop window movment depending on the location of the press.<br>
if press is far from crop window then no move handler is returned (null).
core/src/main/java/com/theartofdev/edmodo/cropper/CropOverlayView.java