Listener

```
public interface ZoomEngine.Listener

                    
```
An interface to listen for updates in the inner matrix. This will be called typically on animation frames.

Method Summary

Modifier and Type	Method	Description
`abstract Unit`	`onUpdate(ZoomEngine engine, Matrix matrix)`	Notifies that the inner matrix was updated.
`abstract Unit`	`onIdle(ZoomEngine engine)`	Notifies that the engine is in an idle state.

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

- Method Detail
  - onUpdate
```
 abstract Unit onUpdate(ZoomEngine engine, Matrix matrix)
```
    Notifies that the inner matrix was updated. The passed matrix can be changed, but is not guaranteed to be stable. For a long lasting value it is recommended to make a copy of it using Matrix.set.
    
    Parameters:
    
    engine - the engine hosting the matrix
    
    matrix - a matrix with the given updates
  - onIdle
```
 abstract Unit onIdle(ZoomEngine engine)
```
    Notifies that the engine is in an idle state. This means that (most probably) running animations have completed and there are no touch actions in place.
    
    Parameters:
    
    engine - this engine