apps/samples/Ensemble8/src/app/java/ensemble/samplepage/XYDataVisualizer.java

rev 9364 : 8088078: [Chart] "Insert Series" can not work as expected after we remove all data
summary: Fixed error while adding new series to empty table or when no series selected.

*** 196,206 ****
          setOnContextMenuRequested((ContextMenuEvent t) -> {
              Node node = t.getPickResult().getIntersectedNode();
              while (node != null && !(node instanceof TreeTableRow) && !(node instanceof TreeTableCell)) {
                  node = node.getParent();
              }
!             if (node instanceof TreeTableCell) {
                  TreeTableCell tc = (TreeTableCell) node;
                  if (tc.getItem() == null) {
                      getSelectionModel().clearSelection();
                  } else {
                      getSelectionModel().select(tc.getIndex());
--- 196,208 ----
          setOnContextMenuRequested((ContextMenuEvent t) -> {
              Node node = t.getPickResult().getIntersectedNode();
              while (node != null && !(node instanceof TreeTableRow) && !(node instanceof TreeTableCell)) {
                  node = node.getParent();
              }
!             if (node == null) {
!                 getSelectionModel().clearSelection();
!             } else if (node instanceof TreeTableCell) {
                  TreeTableCell tc = (TreeTableCell) node;
                  if (tc.getItem() == null) {
                      getSelectionModel().clearSelection();
                  } else {
                      getSelectionModel().select(tc.getIndex());
*** 235,248 ****
  
          MenuItem insertSeriesMenuitem = new MenuItem("Insert Series");
          insertSeriesMenuitem.setDisable(!isEditable());
          insertSeriesMenuitem.setOnAction((ActionEvent t) -> {
              TreeItem<XYChartItem<X, Y>> selectedItem = getSelectionModel().getSelectedItem();
!             if (selectedItem == null) {
!                 return;
!             }
!             Object value = selectedItem.getValue().getValue();
              if (value instanceof ObservableList) {
                  ObservableList parentList = (ObservableList) value;
                  insertSeries(parentList.size(), parentList);
              } else {
                  Object parentValue = selectedItem.getParent().getValue().getValue();
--- 237,248 ----
  
          MenuItem insertSeriesMenuitem = new MenuItem("Insert Series");
          insertSeriesMenuitem.setDisable(!isEditable());
          insertSeriesMenuitem.setOnAction((ActionEvent t) -> {
              TreeItem<XYChartItem<X, Y>> selectedItem = getSelectionModel().getSelectedItem();
!             Object value = selectedItem == null ? chart.getData()
!                     : selectedItem.getValue().getValue();
              if (value instanceof ObservableList) {
                  ObservableList parentList = (ObservableList) value;
                  insertSeries(parentList.size(), parentList);
              } else {
                  Object parentValue = selectedItem.getParent().getValue().getValue();