JavaFX: ComboBox - conflict setButtonCell & setPromptText

Question

I'm using a JFoenix library and I have a problem with ComboBox.

When I want to setPromtText and setButtonCell - the text duplicates. I want to change the size of font on ButtonCell.

Here is my code:

@FXML
private JFXComboBox versionList;

@Override
public void initialize(URL location, ResourceBundle resources) {

    versionList.setPromptText("<");
    versionList.setButtonCell(new ListCell<String>() {
        @Override
        protected void updateItem(String version, boolean empty) {
            if (empty) {
                setText(null);
            } else {
                setText(version);
                setFont(Font.font(15));
            }
        }
    });
}

And as the result I get this:

Or if promt text "Select":

What I'm doing wrong? Thanks in advance.

Answer 1

You have omitted to call the superclass implementation of updateItem(...) in your overridden updateItem(...) method. According to the documentation this will prevent the item and empty properties from being set; so I suspect that what is happening is that the cell still has empty==true, and consequently draws the prompt text when it shouldn't.

The correct implementation should be

@Override
public void initialize(URL location, ResourceBundle resources) {

    versionList.setPromptText("<");
    versionList.setButtonCell(new ListCell<String>() {
        @Override
        protected void updateItem(String version, boolean empty) {

            super.updateItem(version, empty);

            if (empty) {
                setText(null);
            } else {
                setText(version);
                setFont(Font.font(15));
            }
        }
    });
}