Android Open Source - android-open-street-map Scale Gesture Helper

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Back to project page android-open-street-map.

License

The source code is released under:

Apache License

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Java Source Code

package com.android.lib.map.osm.helpers;
//from w  w  w .  j  a va2  s .c o m
import android.content.Context;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.ScaleGestureDetector.SimpleOnScaleGestureListener;

public class ScaleGestureHelper  {

  private ScaleGestureDetector mScaleGestureDetector;
  private IScaleGestureListener mListener;
  
  
  public ScaleGestureHelper(Context context, IScaleGestureListener listener) {
    mListener = listener;
    mScaleGestureDetector = new ScaleGestureDetector(context, new MySimpleOnScaleGestureListener());
  }
  
  public class MySimpleOnScaleGestureListener extends SimpleOnScaleGestureListener {
        
    @Override
    public boolean onScale(ScaleGestureDetector detector) {
      if (mListener != null)
        mListener.onScale(detector.getCurrentSpan());
      return true;
    }
    
    @Override
    public void onScaleEnd(ScaleGestureDetector detector) {
      super.onScaleEnd(detector);
      if (mListener != null)
        mListener.onScaleEnd();
    }
  }
  
  public boolean onTouchEvent(MotionEvent event) {
    mScaleGestureDetector.onTouchEvent(event);
    return mScaleGestureDetector.isInProgress();
  }
  
  public interface IScaleGestureListener {
    public void onScale(float distance);
    public void onScaleEnd();
  }
}

Java Source Code List