JavaFX 8 - How to change the color of the prompt text of a NOT editable combobox via CSS?

Question

The title says everything. I want to change the color of the prompt text of a not editable combobox, so that the text has the same color like the prompt text of a editable combobox. In my CSS-file I tried to use -fx-prompt-text-fill in .combo-box, .combo-box-base, .combo-box-base .text-field and .combo-box-base .text-input, but nothing worked.

What styleclass do I have to use?

Answer 1

When the ComboBox is not editable, there is no TextField, and the property -fx-prompt-text-fill is no longer valid, since the control displayed instead, a ListCell, doesn't extend TextInputControl.

In order to set the style of this cell, we can provide our custom styled ListCell:

@Override
public void start(Stage primaryStage) {
    ComboBox comboBox = new ComboBox();
    comboBox.getItems().addAll("Item 1", "Item 2", "Item 3");
    comboBox.setPromptText("Click to select");
    comboBox.setEditable(false);

    comboBox.setButtonCell(new ListCell(){

        @Override
        protected void updateItem(Object item, boolean empty) {
            super.updateItem(item, empty); 
            if(empty || item==null){
                // styled like -fx-prompt-text-fill:
                setStyle("-fx-text-fill: derive(-fx-control-inner-background,-30%)");
            } else {
                setStyle("-fx-text-fill: -fx-text-inner-color");
                setText(item.toString());
            }
        }

    });

    Scene scene = new Scene(new StackPane(comboBox), 300, 250);
    primaryStage.setScene(scene);
    primaryStage.show();
}