Javafx combobox not updating dropdown size upon change on realtime?

Question

I am using Javafx v8.0.25-b18.

The problem I occur is that the size of the dynamic combox\'s dropdown list doesn\'t change, so if I had initially two items in the dropdo

Answer 1

Just like to offer my two cents here. You may add the following codes to your combobox which define a custom listview popup that has variable height according to the current number of items. You can tweak the maximum number of items to be displayed in the popup.

yourComboBox.setCellFactory(new Callback, ListCell>() {
        @Override
        public ListCell call(ListView param) {
            ListCell cell = new ListCell() {
                @Override
                public void updateItem(String item, boolean empty) {
                    super.updateItem(item, empty);
                    int numItems = getListView().getItems().size();
                    int height = 175;    // set the maximum height of the popup
                    if (numItems <= 5) height = numItems * 35;    // set the height of the popup if number of items is equal to or less than 5
                    getListView().setPrefHeight(height);
                    if (!empty) {
                        setText(item.toString());
                    } else {
                        setText(null);
                    }
                }
            };
            return cell;
        }
    });