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[Best Practices] UI Strucure & Events [message #1096371]

Wed, 28 August 2013 09:43

Daniel Zimmermann

Messages: 81
Registered: July 2009

Member

Sorry for spamming the forum, but since I almost start from zero (again), I'm not sure about the best practices when it comes to JavaFX.

Currently I follow the following approach (not the best thing, I guess):

my_package.ui.Main - primary stage
my_package.ui.RootWindowCreator - the name is speaking
my_package.ui.DeviceWindowCreator - a "sub"-page

my_package.ui.res.bundle - translations
my_package.ui.res.layout - fxgraph & fxml files

Main.java (simplified)

ResourceBundle bundle = ResourceBundle.getBundle("my_package.ui.res.bundle.strings", Locale.getDefault());
RootWindowCreator rootWindow = new RootWindowCreator(primaryStage, bundle);
Scene scene = new Scene(rootWindow.getRootWindow(), DEFAULT_WINDOW_WIDTH, DEFAULT_WINDOW_HEIGHT);
primaryStage.setScene(scene);
primaryStage.show();

RootWindowCreator.java

public class RootWindowCreator {
	
	private final Stage stage;
	private final BorderPane rootWindow;
	
	private final ResourceBundle bundle;
	
	public Stage getStage() {
		return stage;
	}
	
	public BorderPane getRootWindow() {
		return rootWindow;
	}
	
	public ResourceBundle getBundle() {
		return bundle;
	}
	
	public RootWindowCreator(Stage stage, ResourceBundle bundle) throws IOException {
		this.stage = stage;
		this.bundle = bundle;
		FXMLLoader fxmlLoader = new FXMLLoader();
		fxmlLoader.setResources(bundle);
		this.rootWindow = (BorderPane) fxmlLoader.load(this.getClass().getResource("res/layout/Root.fxml").openStream());
		if (fxmlLoader.getController() instanceof RootController) {
			((RootController) fxmlLoader.getController()).setStage(stage);
		}
		fillNavigation();
	}

	private void fillNavigation() throws IOException {
		
		outer: for (Node node : rootWindow.getChildren()) {
			if (!node.getId().equals("splitPaneBody"))
				continue;
			for (Node childNode : ((SplitPane) node).getItems()) {
				if (!childNode.getId().equals("accordionNavigation"))
					continue;
				Accordion navigation = (Accordion) childNode;
				DevicesWindowCreator devicesWindow = new DevicesWindowCreator(stage, bundle);
				navigation.getPanes().add(devicesWindow.getPane());
				navigation.setExpandedPane(devicesWindow.getPane());
				break outer;
			}
			break;
		}
	}

DeviceWindowCreator.java

Alsmost the same as the the RootWindowCreator.java, but without the Navigation thingy.

And of course there are the *Controller classes. But there is my problem. When I want to trigger an Event, that needs to be consumed by a complete other part of the UI, I have no idea of how to achive this in a clean way.
My best idea would be a central Event Handler. Is there something like this in JavaFX already? Otherwise I would implement it by my self. But it would be a bit ugly, since I would need to hook it to the Controller classes (or implement an internal Event Listener class there and register it on the central Event Handler).

For example: The device window would contain a method to trigger the discovery of the devices and should trigger an Event, that a) shows a progress bar on the root window (it is already there but set to be invisible) and a cancel button. Obviously the windows don't really know each other and there is no such method as #findViewById(String) as Android has - knowing the ID I could try to find the progress bar on the primary stage, that is part of the window creator classes, but not the controller...

I don't simply know, if this is a "good" approach. I want to try have a program with code as clean as possible and without ugly hacks, if there already is a standardized mean of doing something like this.

Thanks four your input and greetings,
Daniel

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