IExpressionListener (Eclipse Platform API Specification)

```
public interface IExpressionListener
```
An expression listener is notified of expression additions, removals, and changes. Listeners register and unregister with the expression manager.
Clients may implement this interface.

Since:

2.0

See Also:

IExpressionManager

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`expressionAdded(IExpression expression)`	Notifies this listener that the given expression has been added to the expression manager.
`void`	`expressionChanged(IExpression expression)`	Notifies this listener that the given expression has changed.
`void`	`expressionRemoved(IExpression expression)`	Notifies this listener that the given expression has been removed from the expression manager.

- Method Detail
  - expressionAdded
```
void expressionAdded(IExpression expression)
```
    Notifies this listener that the given expression has been added to the expression manager.
    
    Parameters:
    
    expression - the added expression
  - expressionRemoved
```
void expressionRemoved(IExpression expression)
```
    Notifies this listener that the given expression has been removed from the expression manager.
    
    Parameters:
    
    expression - the removed expression
  - expressionChanged
```
void expressionChanged(IExpression expression)
```
    Notifies this listener that the given expression has changed.
    
    Parameters:
    
    expression - the changed expression