On Fri, 20 Aug 2021 05:15:49 GMT, Michael Strauß <mstra...@openjdk.org> wrote:
>> This PR adds the `Node.focusVisible` and `Node.focusWithin` properties, as
>> well as the corresponding `:focus-visible` and `:focus-within` CSS
>> pseudo-classes.
>
> Michael Strauß has updated the pull request incrementally with one additional
> commit since the last revision:
>
> fixed undeterministic test failures
thanks for taking a closer look :)
> > might also need a test that verifies the focusWithin of a parent added
> > somewhere above the focused node? hmm .. or maybe not, that would require
> > to re-arrange a complete subtree ..
>
> Inserting a parent into a scene graph such that the existing subtree at that
> position becomes a subtree of the newly inserted parent can't be done as an
> atomic operation. First, you'll need to remove the subtree at the insertion
> point from the existing scene graph (otherwise you'll get an exception saying
> that a node can only appear once in a scene graph). Then you can add the new
> parent with the removed subtree as its child.
yeah that's true, but might happen behind the scenes - we can move a focused
node from one parent to another by simply adding it the new.
So I'm not sure I would agree:
> I'm inclined to think that this behavior is a bug.
arguable, though :) Below is an example of moving a focused node (button
"Moving", the other is just for having something else that might get the focus)
between 2 parents by F1: the button keeps its focused state in its new parent
(and scene's focusOwner doesn't change) - I think that's what a user would
expect also when dragging a focused node around (s/he might not even be aware
of the hierarchy). I suspect that changing the behavior would break existing
applications - except if it could be done completely transparently.
The example:
private Parent createContent() {
first = new VBox();
first.setBackground(new Background(new BackgroundFill(Color.ALICEBLUE,
null, null)));
first.getChildren().add(new Label("label on first"));
second = new VBox();
second.setBackground(new Background(new BackgroundFill(Color.LAVENDER,
null, null)));
second.getChildren().add(new Label("label on second"));
moving = new Button("moving");
first.getChildren().add(moving);
Button move = new Button("move");
move.setOnAction(e -> {
move();
});
move.setDefaultButton(true);
HBox content = new HBox(10, first, second, move);
content.addEventFilter(KeyEvent.KEY_PRESSED, e -> {
if (e.getCode() == KeyCode.F1) {
move();
}
});
return content;
}
private void move() {
Parent parent = moving.getParent();
Pane target = parent == first ? second : first;
target.getChildren().add(moving);
}
@Override
public void start(Stage stage) throws Exception {
Scene scene = new Scene(createContent(), 300, 300);
scene.focusOwnerProperty().addListener((scr, ov, nv) -> {
System.out.println("focusOwner: " + nv);
});
stage.setScene(scene);
stage.show();
}
private VBox first;
private VBox second;
private Button moving;
-------------
PR: https://git.openjdk.java.net/jfx/pull/475
