Change title/subtitle chart in DrillDown and DrillUp

Flow
1

Hi. I expect someone could help me.

I have created a multilevel drilldown chart following this topic:

https://github.com/vaadin/charts/blob/master/examples/src/main/java/com/vaadin/addon/charts/examples/columnandbar/ColumnWithNativeLazyDrilldownByIndex.java

I’ve modified this code to add a superlevel of “Browser brands” serie. The new structure of drilldown chart is next:

  2. Year 2015
    [list=1]
  3. MSIE
    [list=1]
  4. MSIE 4.0
  5. MSIE 5.0

    [/list]
  6. Firefox
    [list=1]
  7. Firefox 1.0
  8. Firefox 1.5

    [/list]

    [/list]
  9. Year 2016
    [list=1]
  10. MSIE
    [list=1]
  11. MSIE 6.0
  12. MSIE 7.0
  13. MSIE 8.0
  14. MSIE 9.0

    [/list]
  15. Firefox
    [list=1]
  16. Firefox 2.0
  17. Firefox 3.0

    [/list]

    [/list]

It works fine, but what I want is to change the title or subtitle of the chart in order to follow the path of charts (like breadcrumbs in web pages). For example, if I’m watching a chart where all 2016-MSIE are shown (MSIE 6.0, 7.0, 8.0), I would like to see in subtitle chart this text:
“You are in: Year 2016 > MSIE” but if I return to Year 2016 chart, the text should change to: “You are in: Year 2016”.

With this code:

List<String> breadcrumb = new ArrayList<String>();

chart.setDrilldownCallback(new DrilldownCallback() {
    @Override
    public Series handleDrilldown(DrilldownEvent event) {
        Series ss = getPointDrilldown(event.getItemIndex());
        conf.setSubTitle(ss.getName());
        breadcrumb.add(ss.getName());
        chart.drawChart();
        return ss ;
    }
});

chart.addChartDrillupListener(new ChartDrillupListener() {

            @Override
            public void onDrillup(ChartDrillupEvent event) {
                String subtitle = breadcrumb.get(breadcrumb.size() - 2);
                breadcrumb.remove(breadcrumb.size() - 1);
                conf.setSubTitle(subtitle);
                chart.drawChart();
            }
        });

I get subtitle changes when drilldown, but in leaf level, when I click DrillupButton, the navigation changes to the first chart directly, where years 2015-2016 appears. If I remove all chart.drawChart() methods, the navigations works fine but subtitle doesn’t change.

What I would like to know is if there is a method like refresh() or similar way to get change subtitle with a correct navigation of charts. I have proved with chart.MarkasDirty(), but it doesn’t work.

Thanks for all. Best regards.

AlfaGavi