JavaFX .setStyle inline sub elements - css

Question

In order to style the background for many elements in JavaFX, you need to use a css file, or to use .setStyle.
In my case I have to style the background of the dropdown from a ComboBox, but I have to use .setStyle not a css file (because I have some dynamic colors that will be used to style different GUI elements). The problem here is that if I use the following css code, the function .setStyle doesn't recognize it as if I were to use a css file.
.setStyle(".combo-box .list-cell{ -fx-background: blue;}");
The code would look like this:
comboBox.setStyle(".combo-box .list-cell{ -fx-background: #"+ Color1.toString().substring(2) + ";}");
Color1 beeing a Color object, that will get a dynamic value depending on the case.
The question is, can I use .list-cell inside the function .setStyle? If so, how? This would help me with other GUI elements were I'll have to use .setStyle.

Answer 1

It's possible to use a looked-up colors for this. You can assign those using setStyle and use them from a CSS stylesheet:
#Override
public void start(Stage primaryStage) {
ComboBox<String> comboBox = new ComboBox<>();
comboBox.getItems().addAll("A", "B", "C");
StackPane root = new StackPane(comboBox);
// set color
root.setStyle("cell-color: blue;");
Scene scene = new Scene(root, 400, 400);
scene.getStylesheets().add("style.css");
primaryStage.setScene(scene);
primaryStage.setResizable(false);
primaryStage.show();
}
style.css
/* default values */
.root {
cell-color: yellow;
}
/* use color */
.combo-box .list-cell {
-fx-background: cell-color;
}

Answer 2

For what I have, I like this solution better.
comboBox.setCellFactory(new Callback<ListView<String>, ListCell<String>>() {
public ListCell<String> call(ListView<String> param) {
return new ListCell<String>() {
protected void updateItem(String item, boolean empty) {
super.updateItem(item, empty);
setText(item);
setBackground(new Background(new BackgroundFill(Color.BLACK, CornerRadii.EMPTY, Insets.EMPTY)));
setTextFill(Color.BLUE);
}
};
}
});