OnStateChangedListener

```
public interface SubsamplingScaleImageView.OnStateChangedListener

                    
```
An event listener, allowing activities to be notified of pan and zoom events. Initialisationand calls made by your code do not trigger events; touch events and animations do. Methods inthis listener will be called on the UI thread and may be called very frequently - yourimplementation should return quickly.

Method Summary

Modifier and Type	Method	Description
`abstract void`	`onScaleChanged(float newScale, int origin)`	The scale has changed.
`abstract void`	`onCenterChanged(PointF newCenter, int origin)`	The source center has been changed.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - onScaleChanged
```
 abstract void onScaleChanged(float newScale, int origin)
```
    The scale has changed. Use with getMaxScale and getMinScale to determinewhether the image is fully zoomed in or out.
    
    Parameters:
    
    newScale - The new scale.
    
    origin - Where the event originated from - one of ORIGIN_ANIM, ORIGIN_TOUCH.
  - onCenterChanged
```
 abstract void onCenterChanged(PointF newCenter, int origin)
```
    The source center has been changed. This can be a result of panning or zooming.
    
    Parameters:
    
    newCenter - The new source center point.
    
    origin - Where the event originated from - one of ORIGIN_ANIM, ORIGIN_TOUCH.