JavaFX: How to trigger TreeItem event - events

Question

I have class myClass extends TreeItem<file> to be used as datamodel in a TreeTableView mostly following the example here: https://docs.oracle.com/javase/8/javafx/api/javafx/scene/control/TreeItem.html .
public class myTreeItem extends TreeItem<File>
private boolean isLeaf;
private boolean isFirstTimeChildren = true;
private boolean isFirstTimeLeaf = true;
#Override public ObservableList<TreeItem<File>> getChildren() {
// ... full code see link to Oracle documentation
return super.getChildren();
}
private ObservableList<TreeItem<File>> buildChildren(TreeItem<File> TreeItem) {
// ... full code see link to Oracle documentation
};
}
I have added a function to add children to this item. I have problems with the correct update of the TreeTableView. More details see in the code and comments below:
public void addChild(String name) {
itemManger.addChild(this.getValue(), name); // Generate Child
isFirstTimeChildren = true; // Ensure that buildChildren() is called, when getchildren() is called.
// getChildren(); // If I would activate this line,
// all listeners would be notified
// and the TreeTableView is updated.
// This is most likely due to the call super.getChildren();
// However I want to throw the event on my own in order
// to avoid the extra call of this.getChildren(). Here is my
// (not sufficent) try:
EventType<TreeItem.TreeModificationEvent<MLDCostumizableItem>> eventType = TreeItem.treeNotificationEvent();
TreeModificationEvent<MLDCostumizableItem> event = new TreeModificationEvent<>(eventType,this);
Event.fireEvent(this, event);
// Here I don't know how to get a value for target.
// Is there some standard target, which includes all FX components?
}
How the correctly throw this event?

Answer 1

Seems that I had a missunderstanding in how the triggering works in JavaFX. Now the most simple solution is:
#Override // Taken from Link
public void update(Observable observ, Object arg1) {
if (observ!=this.item)
{
LOGGER.error(new MLDConnectionException("Unexpected call of update() with observ = " + observ.toString()));
return;
}
// Build new Chidren list
try {
super.getChildren().removeIf((x) -> true); // empty list
super.getChildren().setAll(buildChildren(this));
} catch (MLDConnectionException e) {
LOGGER.error("Error when genereting children List: ", e);
}
}
public File addChild(String name) throws MLDException {
File newChild = itemManger.addChild(item, name);
update(this.item, null);
return newChild;
}