How to get data from dynamically generated JavaFX PieChart?

Question

I'm trying to figure out how to get and update existing data in a set of dynamically created pie charts in JavaFX. These pie charts are all saved in an ArrayList. The first task is figure out how to get that data.

As I'm creating these pie charts dynamically from a set of fluid data sources, I cannot make multiple observable lists using code similar to this:

private ObservableList<PieChart.Data> dataList = FXCollections.observableArrayList();

Any ideas on how can I read the data name and value from each dynamically generated pie chart slice?

Answer 1

Every PieChart (view) has access to its own ObservableList<PieChart.Data> (model) via its data property. Given a List<PieChart> named list, you can traverse the list and examine or update each chart's data as warranted:

list.get(0).getData().get(0).setPieValue(42);
for (PieChart p : list) {
    for (PieChart.Data data : p.getData()) {
        System.out.println(data);
    }
}

Console data from Ensemble8 PieChartApp:

Data[Sun,42.0]
Data[IBM,12.0]
Data[HP,25.0]
Data[Dell,22.0]
Data[Apple,30.0]

As an alternative to having a list of views, List<PieChart>, consider maintaining a list of models, List<ObservableList<PieChart.Data>>.