javafx bind button disable property to folder exists - javafx

Question

I have a stage with a button "Continue" which is want to be disabled until a folder "folderFramework" is created.
Here is my snippet which unfortunately does not work.
File folderFramework = new File("path to the folder");
ObjectProperty<File> file = new SimpleObjectProperty<>();
file.set(folderFramework); // tested with setValue too...
BooleanBinding fileExists = Bindings.createBooleanBinding(() ->
file.get() != null && file.get().exists(),
file);
btnContinue.disableProperty().bind(fileExists.not());
What am I missing? Thank you!

Answer 1

WatchService in the Task did the trick for me. Here is the final solution:
private void handleBtnContinue() {
// task definition for watching changes in framework folder
Task<Void> watchingTask = new Task<>() {
#Override
protected Void call() {
WatchService watchService;
try {
watchService = FileSystems.getDefault().newWatchService();
Path path = Paths.get(ConstantUtils.getPathFolderFramework());
path.register(
watchService,
StandardWatchEventKinds.ENTRY_CREATE,
StandardWatchEventKinds.ENTRY_DELETE,
StandardWatchEventKinds.ENTRY_MODIFY);
WatchKey key;
boolean quitTask = false;
while ((key = watchService.take()) != null && !quitTask) {
for (WatchEvent<?> event : key.pollEvents()) {
// when src folder is cloned -> enable the button continue
if (event.kind().toString().equals("ENTRY_MODIFY") && event.context().toString().equals("src")) {
// enable btn continue
Platform.runLater(() -> btnContinue.setDisable(false));
// end the task
quitTask = true;
}
}
key.reset();
}
} catch (IOException | InterruptedException e) {
LOG.error("Error occurred while trying to watch changes in folder: " + ConstantUtils.getPathFolderAppData());
}
return null;
}
};
// run the task in a new thread
Thread th = new Thread(watchingTask);
th.setDaemon(true);
th.start();
}