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

```
public interface BeforeDatasetDrawHook
```
Called before drawing the 'chart' dataset at the given 'args.index' (datasets are drawn in the reverse order).
If any plugin returns false, the datasets drawing is cancelled until another 'render' is triggered.

Author:

Andrea "Stock" Stocchero

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`onBeforeDatasetDraw(IsChart chart, PluginDatasetArgument item)`	Called before drawing the 'chart' dataset at the given 'args.index' (datasets are drawn in the reverse order). If any plugin returns `false`, the datasets drawing is cancelled until another 'render' is triggered.

- Method Detail
  - onBeforeDatasetDraw
```
boolean onBeforeDatasetDraw(IsChart chart,
                            PluginDatasetArgument item)
```
    Called before drawing the 'chart' dataset at the given 'args.index' (datasets are drawn in the reverse order).
    If any plugin returns false, the datasets drawing is cancelled until another 'render' is triggered.
    
    Parameters:
    
    chart - the chart instance.
    
    item - the dataset item.
    
    Returns:
    
    false to cancel the chart datasets drawing.