JavaFX 2.0 + FXML. Updating scene values from a different Task

问题

I want to get the controller from a scene that i've loaded with FXMLoader. The use case is:

My JSON manager receives a JSON object

The task I've launched shows a new Scene using

Parent p = FXMLLoader.load(getClass().getResource("foo.fxml"));
Scene scene = new Scene(p);
stage.setScene(scene);

After that, i have the empty scene.

Now I do this to fill the components

AnchorPane pane = (AnchorPane)((AnchorPane) scene.getRoot()).getChildren().get(0);
for(Node node : pane.getChildren()){
    String id = node.getId();
    if(id.equals(NAME)){
         ((TextField)node).setText(value);
    }
}

My question, is there an easier way to do this? I have a controller specified in FXML

<AnchorPane id="AnchorPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="526.0" minWidth="356.0" prefHeight="526.0" prefWidth="356.0" 
xmlns:fx="http://javafx.com/fxml" fx:controller="bar.foo">

I want to get the instance with the bind values (TextField called name in this case)

Thanks in advance

回答1:

1) You can get the controller from the FXMLLoader but don't know is it possible from Scene :

FXMLLoader fxmlLoader = new FXMLLoader();
Pane p = fxmlLoader.load(getClass().getResource("foo.fxml").openStream());
bar.foo fooController = (bar.foo) fxmlLoader.getController();

To use the fooController later in a different part of your code, you can use Node#setUserData(). For example after the code above:

p.setUserData(fooController);
...
// after a while of app logic and code
bar.foo controller_of_p = (bar.foo) p.getUserData();

This gives a workaround and a shortcut to achieve your goal.

2) If your node has an id then you can directly Node#lookup() it rather than constructing a for-loop :

TextField txt = (TextField) pane.lookup("#nodeId");

来源：https://stackoverflow.com/questions/10107829/javafx-2-0-fxml-updating-scene-values-from-a-different-task

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java

javafx-2

fxml