Javafx Treeview item action event

Question

I\'m trying to create a menu using a treeView. This is the first time I\'m using treeView and have been reading up on it on several websites.

I\'m having some proble

Answer 1

I couldn't find method getPickResult in mouse event, so maybe next is preferable then answer from Alex:

1) add listener to tree view

treeView.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> handle(newValue));

2) handle clicks, it's not need distinguish clicks on empty space and nodes

private void updateSelectedItem(Object newValue) {      
    System.out.println(newValue);
}

Answer 2

According to the JavaFX 2.2 documentation :

" ..a TreeItem is not a Node, and therefore no visual events will be fired on the TreeItem, To get these events, it is necessary to add relevant observers to the TreeCell instances (via a custom cell factory)."

I think this example on using TreeView will be somehow useful.

Answer 3

treeView.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<TreeItem<String>>() {

                @Override
                public void changed(ObservableValue<? extends TreeItem<String>> observable,
                        TreeItem<String> oldValue, TreeItem<String> newValue) {
                    // newValue represents the selected itemTree
                }

            });

Answer 4

This may be solved by implementing CellFactory, but I think the easiest way is like this:

1) Create and add an event handler to the TreeView:

EventHandler<MouseEvent> mouseEventHandle = (MouseEvent event) -> {
    handleMouseClicked(event);
};

treeView.addEventHandler(MouseEvent.MOUSE_CLICKED, mouseEventHandle); 

2) Handle only clicks on the nodes (and not on empy space os the TreeView):

private void handleMouseClicked(MouseEvent event) {
    Node node = event.getPickResult().getIntersectedNode();
    // Accept clicks only on node cells, and not on empty spaces of the TreeView
    if (node instanceof Text || (node instanceof TreeCell && ((TreeCell) node).getText() != null)) {
        String name = (String) ((TreeItem)treeView.getSelectionModel().getSelectedItem()).getValue();
        System.out.println("Node click: " + name);
    }
}