content: package indi.liyi.viewer.scimgv;
  
  import android.view.MotionEvent;
  import android.widget.ImageView;
  
  class Util {
  
      static void checkZoomLevels(float minZoom, float midZoom,
                                  float maxZoom) {
          if (minZoom >= midZoom) {
              throw new IllegalArgumentException(
                      "Minimum zoom has to be less than Medium zoom. Call setMinimumZoom() with a more appropriate value");
          } else if (midZoom >= maxZoom) {
              throw new IllegalArgumentException(
                      "Medium zoom has to be less than Maximum zoom. Call setMaximumZoom() with a more appropriate value");
          }
      }
  
      static boolean hasDrawable(ImageView imageView) {
          return imageView.getDrawable() != null;
      }
  
      static boolean isSupportedScaleType(final ImageView.ScaleType scaleType) {
          if (scaleType == null) {
              return false;
          }
          switch (scaleType) {
              case MATRIX:
                  throw new IllegalStateException("Matrix scale type is not supported");
          }
          return true;
      }
  
      static int getPointerIndex(int action) {
          return (action & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
      }
  }
  