(https://stackoverflow.com/questions/45440102/javafx-css-class-not-removed-when-node-disconnected)
I appeared to have discovered a case in JavaFX (8u144, running on
Windows 7) where a TextField is rendered using the wrong style class.
This only appears to happen in the following situation
* style class removed whilst Node not attached to Scene AND
* parent `GridPane` has a style-class assigned, even if that class
doesn't have content.
I've separated the issue from a larger application into the following
contrived example:
public class RenderBug extends Application {
private static final String ERROR = "error";
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception
{
TextField field = new TextField();
GridPane grid = new GridPane();
grid.getStyleClass().add("some-random-class");
grid.add(field, 0, 0);
StackPane stack = new StackPane(grid);
Scene scene = new Scene(stack);
scene.getStylesheets().add("/foo.css");
primaryStage.setWidth(300);
primaryStage.setHeight(300);
primaryStage.setScene(scene);
primaryStage.show();
Timeline line = new Timeline();
line.getKeyFrames().add(new
KeyFrame(Duration.seconds(4), event -> {
field.getStyleClass().add(ERROR);
}));
line.getKeyFrames().add(new
KeyFrame(Duration.seconds(5), event -> {
stack.getChildren().remove(grid);
}));
line.getKeyFrames().add(new
KeyFrame(Duration.seconds(6), event -> {
field.getStyleClass().remove(ERROR);
}));
line.getKeyFrames().add(new
KeyFrame(Duration.seconds(7), event -> {
stack.getChildren().add(grid);
System.out.println(field.getStyleClass());
}));
line.play();
}
}
foo.css
.text-field.error {
-fx-background-color: red;
}
.some-random-class {
/** no content required */
}
Screenshot. At this point TextField is red, even though the class
"error" has been removed. Even interacting with the field, resizing
window etc. does not fix the issue.
[![TextField shown with red][1]][1]
Is this a genuine bug? or am I doing something wrong? I can't find any
documentation to hint that style-classes cannot or shouldn't be
updated "offline"
[1]: https://i.stack.imgur.com/ZPEYi.png
