linphone-android/src/org/linphone/compatibility/CompatibilityScaleGestureDetector.java

package org.linphone.compatibility;

import android.annotation.TargetApi;
import android.content.Context;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;

@TargetApi(8)
public class CompatibilityScaleGestureDetector extends ScaleGestureDetector.SimpleOnScaleGestureListener {
	private ScaleGestureDetector detector;
	private CompatibilityScaleGestureListener listener;
	
	public CompatibilityScaleGestureDetector(Context context) {
		detector = new ScaleGestureDetector(context, this);
	}
	
	public void setOnScaleListener(CompatibilityScaleGestureListener newListener) {
		listener = newListener;
	}
	
	public boolean onTouchEvent(MotionEvent event) {
		return detector.onTouchEvent(event);
	}
	
	@Override
    public boolean onScale(ScaleGestureDetector detector) {
		if (listener == null) {
			return false;
		}
		
		return listener.onScale(this);
    }
	
	public float getScaleFactor() {
		return detector.getScaleFactor();
	}
	
	public void destroy() {
		listener = null;
		detector = null;
	}
}