Single tooltip for stacked barchart

[Alex]

Is it possible to have a single tooltip that will display, at the top of the stack, aggregated data from all parts of the stacked bar, no matter what part the user touches.Also, how do I add the % sign to the Y LinearAxis of the chart. I guess setStringFormat on the LinearAxis object is the way to go, but cannot figure out the format syntax.

[Alex]

Please delete the two extra duplicate posts. It was reporting a failure when I was trying to post, while it actually did post the message

[Victor]

Hi Alexandar,

Thanks for the questions.
You can call setLabelFormat() with a java format string.
To display aggregate data in the tooltip you have to provide a custom tooltip adapter. For example:

public class CustomTooltipAdapter extends ChartTooltipContentAdapter {
    CategoricalAxis axis;
    public CustomTooltipAdapter(Context context, CategoricalAxis axis) {
        super(context);
        this.axis = axis;
    }
    @Override
    public View getView(Object[] targets) {
        Object category = ((CategoricalDataPoint)targets[0]).getCategory();
        List<DataPoint> points = axis.getDataPointsForValue(category);
        LinearLayout tooltipContainer = new LinearLayout(this.context);
        tooltipContainer.setOrientation(LinearLayout.VERTICAL);
        TextView categoryView = new TextView(this.context);
        categoryView.setBackgroundColor(Color.BLACK);
        categoryView.setTextColor(Color.WHITE);
        categoryView.setText(String.format("Category: %s", category.toString()));
        tooltipContainer.addView(categoryView);
        for(DataPoint point : points) {
            tooltipContainer.addView(createViewForPoint((CategoricalDataPoint)poi
        }
        return tooltipContainer;
    }
    private View createViewForPoint(CategoricalDataPoint point) {
        BarSeries series = (BarSeries)point.getParent().getPresenter();
        TextView pointView = new TextView(this.context);
        pointView.setBackgroundColor(series.getLegendFillColor());
        pointView.setText(String.format("Value: %f.2", point.getValue()));
        return pointView;
    }
}

This assumes that you are using CategoricalAxis. If you are using DateTimeContinuousAxis you will have make a few modifications.

Please write again if you need further assistance.

Regards,
Victor
Telerik