JavaFX 2: Making a ScrollPane automatically scroll to the edge after adding content

Question

Using JavaFX 2, I have a basic example of a ScrollPane that contains an HBox of Labels. I want to be able to add a Label to

Answer 1

you can bind to Hbox widthproperty chnages .

Sample Code :

   //in start method add this code
    DoubleProperty wProperty = new SimpleDoubleProperty();
    wProperty.bind(chatBox.widthProperty()); // bind to Hbox width chnages
    wProperty.addListener(new ChangeListener() {
        @Override
        public void changed(ObservableValue ov, Object t, Object t1) {
           //when ever Hbox width chnages set ScrollPane Hvalue
         chatBoxScrollPane.setHvalue(chatBoxScrollPane.getHmax()); 
        }
    }) ;

and

 // remove below line from your addChatItem() method   
 chatBoxScrollPane.setHvalue(chatBoxScrollPane.getHmax());

Result :yes added numbering for fun ;)

Answer 2

In my case I needed to enclose a HBox called labels inside a ScrollPane called msgs and here is the way I handled autoscroll.

NOTE: The changeListener added to labels HBox is implemented via Lambda syntax(available in JDK8)

labels.heightProperty().addListener((observable, oldVal, newVal) ->{
        msgs.setVvalue(((Double) newVal).doubleValue());
    });