Customized TreeView: setOnAction for Custom Label in TreeCell - checkbox

Question

I have made a TreeView, represented by a custom cellFactory where each cell is represented by an HBox looking like this.
How can I access the checkbox so that if you check it, a private boolean field in the corresponding EventTreeItem changes it's value?
Code:
public class EventTreeItem extends TreeItem<String>{
SimpleStringProperty item;
boolean important = true;
public EventTreeItem(boolean important, int id){
this.noNode = noNode;
super.setValue(id);
}
public EventTreeItem(){
}
public void setImportant(Boolean important){
this.important = important;
}
}
CellFactory:
public final class CustomTreeCellFactory extends TreeCell<String>{
private TextField textField;
private HBox hBox;
private HBox hBoxLeaf;
public CustomTreeCellFactory(){
try {
hBox = (HBox) FXMLLoader.load(getClass().getResource("/Views/TreCell.fxml"));
} catch (IOException e) {
System.out.println("This didn't work");
e.printStackTrace();
}
try {
hBoxLeaf = (HBox) FXMLLoader.load(getClass().getResource("/Views/TreCellLowestLevel.fxml"));
} catch (IOException e) {
System.out.println("This didn't work");
e.printStackTrace();
}
hBox.setAlignment(Pos.CENTER_LEFT);
hBoxLeaf.setAlignment(Pos.CENTER_LEFT);
}
#Override
public void updateItem(String item, boolean empty) {
super.updateItem(item, empty);
if (item != null) {
EventTreeItem eventTreeItem = (EventTreeItem) getTreeItem();
if (getTreeView().getTreeItemLevel(getTreeItem())==1) {
setGraphic(this.hBox);
((CheckBox) ((HBox)getGraphic()).getChildren().get(3)).setSelected(((EventTreeItem) getTreeItem()).important);
((Label) hBox.getChildren().get(0)).setText(eventTreeItem.noNode.getEntryNumber() + " " + eventTreeItem.noNode.getClass().getName().split("\\.")[3]);
((Label) hBox.getChildren().get(1)).setText(eventTreeItem.noNode.getDate().toString());
}else if (getTreeView().getTreeItemLevel(getTreeItem())==2){
setGraphic(this.hBoxLeaf);
}
} else {
setGraphic(null);
}
}
}
NodeTreeView
public class NodeTreeView implements ChartView{
private FilteredListModel filteredListModel;
TreeItem<String> root;
AnchorPane parent;
TreeView treeView;
public NodeTreeView(FilteredListModel filteredListModel, TabPane tabPane) throws IOException {
this.filteredListModel = filteredListModel;
parent = (AnchorPane) FXMLLoader.load(getClass().getResource("/Views/TryTreeViewInAnchorPane.fxml"));
parent.setVisible(true);
generateTree();
}
private void generateTree() {
this.root = new EventTreeItem();
root.setExpanded(true);
filteredListModel.makeEventNodeArrays().forEach(node->{
EventTreeItem item = new EventTreeItem((EventNoNode) node);
EventTreeItem item2 = new EventTreeItem();
root.getChildren().add(item);
item.getChildren().add(item2);
});
treeView = (TreeView) parent.getChildren().get(0);
treeView.setRoot(root);
treeView.setShowRoot(false);
treeView.setEditable(true);
treeView.setCellFactory(new Callback<TreeView<String>, TreeCell<String>>() {
#Override
public TreeCell<String> call(TreeView<String> param) {
return new CustomTreeCellFactory();
}
});
}
}

Answer 1

You can add a listener to checkbox's selectedProperty in your CustomTreeCellFactory constructor (which is not a factory, btw; you should call it CustomTreeCell instead):
public CustomTreeCellFactory() {
// ...
CheckBox checkbox = ...;
checkbox.selectedProperty().addListener((obs, wasSelected, isSelected) -> {
((EventTreeItem) getTreeItem()).important = isSelected;
});
}
Btw, it is probably a better idea to make the "important" flag be part of the item, i.e. instead of TreeView<String>, you would have TreeView<MyItem> where MyItem is
class MyItem {
String item;
boolean important;
MyItem(String item, boolean important) {
this.item = item;
this.important = important;
}
}