content: /*******************************************************************************
   * Copyright 2011, 2012 Chris Banes.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *******************************************************************************/
  package uk.co.senab.photoview.gestures;
  
  import android.annotation.TargetApi;
  import android.content.Context;
  import android.view.MotionEvent;
  import android.view.ScaleGestureDetector;
  
  @TargetApi(8)
  public class FroyoGestureDetector extends EclairGestureDetector {
  
      protected final ScaleGestureDetector mDetector;
  
      public FroyoGestureDetector(Context context) {
          super(context);
          ScaleGestureDetector.OnScaleGestureListener mScaleListener = new ScaleGestureDetector.OnScaleGestureListener() {
  
              @Override
              public boolean onScale(ScaleGestureDetector detector) {
                  float scaleFactor = detector.getScaleFactor();
  
                  if (Float.isNaN(scaleFactor) || Float.isInfinite(scaleFactor))
                      return false;
  
                  mListener.onScale(scaleFactor,
                          detector.getFocusX(), detector.getFocusY());
                  return true;
              }
  
              @Override
              public boolean onScaleBegin(ScaleGestureDetector detector) {
                  return true;
              }
  
              @Override
              public void onScaleEnd(ScaleGestureDetector detector) {
                  // NO-OP
              }
          };
          mDetector = new ScaleGestureDetector(context, mScaleListener);
      }
  
      @Override
      public boolean isScaling() {
          return mDetector.isInProgress();
      }
  
      @Override
      public boolean onTouchEvent(MotionEvent ev) {
          mDetector.onTouchEvent(ev);
          return super.onTouchEvent(ev);
      }
  
  }
  