🚀 go-pugleaf

I am trying to start one and am on the way,  but running into some
problems.  The JTextField use the MVC (Model View Controller)
architecture,  the Model ( PlainDocument ) contains the data and  the
view (FieldView) displays it.

Sub-classing PlainDocument to allow only specific types of data you can
control what goes into the field.  Override the Document.insertString()
method to test whether to allow the insertion and/or modify the data
before adding it.

To attach your Document Class to the JTextField,  override
createDefaultModel() to return an instance of your Document sub-class.

That's the easy part.  The harder part comes when you try to remove data
from the document.  I think the approach I may take is to allow any
insertion or removal and  set a flag to indicate whether or not the data
passes all the edits.  If it does not,  then I would display it it in an
error colour.  If it does,  then I would display in standard colour.

My problem now is to figure out how to attach a sub-class of field view
to the JTextField subclass.  Does anyone know how to do that?

John v.


Bernd Schloemer wrote:

> Hallo,
>
> Does anywhone have an idea how to make an editmask for an Jtextfield
>
> regards Bernd