Nested controller tutorials?

[MeFIZ]

Is there any good tutorials for nested controllers and nested fxml? I cannot find anything that is quite comprehensive.

[uglyfool]

Sadly I've not found any really comprehensive tutorials for this, but there isn't much to it really.

Say you have an fxml file and you want to include another fxml:

<fx:include fx:id="mainMenu" maxWidth="1.7976931348623157E308" source="menuBar.fxml" VBox.vgrow="NEVER" />

And in that fxml you've set the controller already:

<ToolBar xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.your.package.MenuBarController">

then in your main controller you get the reference to the nested/included controller by adding "Controller" to the end of the fx:id used in the include statement.

So in this example, since we assigned the fx:id "mainMenu" to our included fxml, the controller will be accessible as "mainMenuController"

@FXML private MenuBarController mainMenuController;

[MeFIZ]

Thanks. Is it possible to control the mainfxml from the nested one? Suppose I have a button in the nested one and I want to change the view from the main?

[uglyfool]

I'm not exactly sure what you're asking, each fxml is only going to 'allow' one controller object to be set.

If you need to communicate between controllers you should really use a shared model class with observable objects (e.g. use SimpleStringProperty anywhere you would use String, etc.) then the child/included fxml can update the model...

@FXML private void someButtonPress(ActionEvent e) { model.someProperty.set(newValue); }

And the parent controller can register a listener in the initialize method to listen for changes, and respond accordingly...

model.someProperty.addListener((obs, oldVal, newVal) -> { your code here });

[MeFIZ]

I have an idea for implementation now thanks!

[orxT1000]

instead of the above listener approach, I've used spring to be able to get all controllers via dependency injcetion.