ChartLibLoader (Google Charts component for wicket 9.0.0-M5.1 API)

All Known Implementing Classes:

ChartLibLoaderBehavior
```
public interface ChartLibLoader
```
Interface for implementation of central lib and package loading mechanism. The implementation should load the Google chart lib only once and load every package needed by all charts added. If a Maps API key is set in one of the charts, it is also added.

Author:

Dieter Tremel

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`addChart(Chart chart)`	Add a chart to the loader, so it's package is loaded to.
`HeaderItem`	`getHeaderItem()`	Get the HeaderItem the loader adds, only to make dependencies to.
`boolean`	`removeChart(Chart chart)`	Remove a previous added chart.

- Method Detail
  - addChart
```
boolean addChart(Chart chart)
```
    Add a chart to the loader, so it's package is loaded to.
    
    Parameters:
    
    chart - Chart to add.
    
    Returns:
    
    True if Chart is added.
  - removeChart
```
boolean removeChart(Chart chart)
```
    Remove a previous added chart.
    
    Parameters:
    
    chart - Chart to remove.
    
    Returns:
    
    True if the Chart was managed and is removed now, false otherwise.
  - getHeaderItem
```
HeaderItem getHeaderItem()
```
    Get the HeaderItem the loader adds, only to make dependencies to.
    
    Returns:
    
    HeaderItem that the loader contributes.