LegendFilterCallback (Charba - J2CL and GWT charts library based on CHART.JS)

```
public interface LegendFilterCallback
```
Filters legend items out of the legend. Receives 2 parameters, a Legend Item and the chart.

Author:

Andrea "Stock" Stocchero

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  boolean onFilter(IsChart chart, T item)
  Callback that filter items on chart components.

- Method Detail
  - onFilter
```
boolean onFilter(IsChart chart,
                 T item)
```
    Callback that filter items on chart components.
    
    Parameters:
    
    chart - chart instance
    
    item - item to be filtered
    
    Returns:
    
    false to remove the item from the container, otherwise true.