Convert FXML (s) loading class hierarchy

Hi all

As I'm not sure of my observation is really the thread "so, really, how you are meant to use FXML to a real application. (So, really, how you are meant to use FXML to a real application? ) I prefer to open a new one.

I develop in javaFX 2.0 experimentation (I want to say I do more in trying, so guessing based on extensive reading on theoretical /of course I read forums, but these treats questions mainly practices /) with FXML. FXML has several very attractive feature, promising bright future.

I wonder, however, why does the FXMLLoader not simply copy the XML structure, create all the objects described and the making available of the main java class. Create the hierarchy of objects and make the 'main' root public. Just as will happen if we have defined the user interface by code. A single audience 'root' class that each additional item is connected (attached) of some sort (in a concrete path), each point can be referenced in a logical manner. One single root class would require only one controller, fx:id pourrait make it easy to reference a certain (deep) branch of the described class hierarchy structure of fxml directly.

Why is required to assign to each fxml (root) a controller on its own?

In my understanding in order to centralize the management of events in fact I need to define a separate controller for each (in my case nearly 20) of the fxml modules that simply passes events to the central eventhandler class raised. Is this good?

The FXMLLoader is supposed to create the hierarchy of the objects anyway. Why is it not public?

(1) I think that included (fx: include) fxmls need not necessarily a controller on their own, they can share one of their parents, children fxmls don't need to assign a controller to.

This is normal. Includes many represent functional modules, as do classes. Using a controller by include, we support encapsulation, which is important from the point of view OOD.

However, if you want to share includes controllers between and you use JavaFX 2.1, you could use a custom controller factory to return the same instance of controller for each document FXML in your hierarchy.

I have not found the way to address (in order to change some properties):
BorderPane.top.menubar.getItem ("File") .getItem (2) .backgroundcolor = gray or something like that) an object in the tree from the root only by its known position. Is it possible that (except fx:id) to designate a certain object?

If you just want to set a style, you should probably use CSS classes to style. If indeed, you need get a reference to the element (for example, to call a method on it), you can use fx:id. ID values are automatically mapped to the fields in your controller, but you can also access their values via FXMLLoader #getNamespace () or #lookup (String) Node.

Could you please give an example how (in the case of one KeyPressed event for example) the object that triggered the event can be identified.

You can get the event source of the object passed to your event handler event:


In your controller:

@FXML
protected void handleTxtPartnerKeyPressed(KeyEvent event) {
    TextField source = (TextField)event.getSource();

    ...
}

Tags: Java

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