IStateListener (Eclipse Platform API Specification)

All Known Implementing Classes:

AbstractHandlerWithState
```
public interface IStateListener
```
A listener to changes in some state.

Clients may implement, but must not extend this interface.

Since:

3.2

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`handleStateChange(State state, Object oldValue)`	Handles a change to the value in some state.

- Method Detail
  - handleStateChange
```
void handleStateChange(State state,
                       Object oldValue)
```
    Handles a change to the value in some state.
    
    Parameters:
    
    state - The state that has changed; never null. The value for this state has been updated to the new value.
    
    oldValue - The old value; may be anything.