Re: UIDefaults key?

From:

Eric Sosman <esosman@comcast-dot-net.invalid>

Newsgroups:

comp.lang.java.programmer

Date:

Wed, 06 Aug 2014 14:38:59 -0400

Message-ID:

<lrtso6$t3s$1@dont-email.me>

On 8/6/2014 2:17 PM, Knute Johnson wrote:

On 8/6/2014 10:31, Eric Sosman wrote:

On 8/6/2014 12:25 PM, Knute Johnson wrote:

JComponent has a method, getUIClassID(), to return the UIDefaults key
for the ComponentUI subclass. A JTextField returns a key of
TextFieldUI. A typical subclass is
javax.swing.plaf.metal.MetalTextFieldUI.

All the interesting details in the UIDefaults however use keys such as
TextField.foreground, TextField.border, TextField.margin etc. Is there
any way to get the prefix, TextField, from the component other than
stripping the UI off the end of the UIClassID?

     Climbing the class hierarchy from MetalTextFieldUI up to
BasicTextFieldUI, I find the method

     /**
      * Fetches the name used as a key to lookup properties through the
      * UIManager. This is used as a prefix to all the standard
      * text properties.
      *
      * @return the name ("TextField")
      */
     protected String getPropertyPrefix() {
         return "TextField";
     }

... which sort of looks like what you're after. (But I haven't
researched any other delegate classes, so it's possible they're
different.)

I think that is the answer Eric but I just not sure how to get there
from here yet :-).

Sorry: I somehow thought you already had your hands on an instance
of the ComponentUI subclass -- But now I think you've got nothing but a
JComponent object. Also, I see that the method I stumbled upon is
defined for some ComponentUI subclasses, but not for all.

Perhaps it's time to take a step back and think about the eventual
goal rather than about one particular (and possibly unworkable) route
toward it. What problem are you trying to solve?

--
esosman@comcast-dot-net.invalid