🚀 go-pugleaf

On Wed, 21 Mar 2001 18:22:58 -0600, Paul King wrote
(in message <rihibt42piiu8mbei09uc7o066ll4sramp@4ax.com>):

> I am not necessarily new to Java, but am a novice at writing GUI-based
> Java programs.
> 
> I am trying to build a GUI with a text object (JTextPane). I have a need
> to place display text into that object. Here is the declaration:
> 
>     javax.swing.JTextPane txtMessage = new javax.swing.JTextPane();
> 
> Having done that, in the same scope as the current object that the above
> declaration was in, I placed this statement in one of the methods, a
> response to pressing a button:
> 
>     txtMessage.text = "Some text";
> 
> hoping it would appear as displayed text in the text pane. The logic of
> using txtMessage.text is that the "text" part appears as a property on my
> CodeWarrior object inspector for the "txtMessage" object. Giving the
> "text" property a value in the object inspector results in that value
> being displayed.
> 
> However, expressing the object as I have above results in CodeWarrior
> telling me that the property "text" does not exist as a part of
> javax.swing.JTextPane. Indeed, it does not appear to appear in the API for
> JTextPane nor any of the classes it implements that I have seen. So, where
> is the Object inspector assigning the value? In object inspectors of other
> languages I've written in, the properties listed there are properties of
> the class that is "inspected". Usually, a simple assignment statement like
> the one above should work. However, it does not compile, because "text" is
> apparently not a property of JTextPane. Is CodeWarrior trying to screw
> with my mind?
> 
> If I am going about this all wrong, can anyone suggest how I can write
> text into a GUI-based text object?
> 
> Thanks for any help you can offer.
> 
> PJK

I don't have any advice about why CodeWarrior is showing that 
property, but to set the text displayed you should do a 

txtMessage.setText("Some Text");

-- 
Bill Tschumy
Otherwise -- Austin, TX
bill@otherwise.com

 txtMessage.setText("Some text");

Find the Java APIs from java.sun.com, they are great for answering
this type of question.

Stephen
Java utilities: CSV parsing,  StringTokenizer replacement,  password dialog, Base64 encode/decode, and web browser control.
http://www.smo.f2s.com/utils/

>However, expressing the object as I have above results in
CodeWarrior
>telling me that the property "text" does not exist as a part of
>javax.swing.JTextPane. Indeed, it does not appear to appear in the
API for
>JTextPane nor any of the classes it implements that I have seen.

Wow did you IDE lie to you!  Don't feel bad mine lies too.

There is some decent material on the Text objects at
www.javasoft.com.

I'll give you the summary:

* Java's text objects are a pain to use (you won't find that at
Sun's site) but are powerfull.

* The larger text objects store their text in a Document object.
You can get the Document object by using JTextPane.getDocument()

* This is the key THE BEST WAY TO CHANGE THE TEXT IS BY USING THE
DOCUMENT OBJECT NOT THE setText method.  setText is slow and doesn't
draw nicely on the screen.

* The Document object is kinda a pain too!

* Use the document's insertString method.

* so....

myJPane.getDocument.insertString("my stuff", offset, null);

the first argument is a string.  the second is the index (you can
get this for other methods of Document) The last argument is the
Attibute you want the text in (null seems to work just fine!);

Neat Trick:

You can tie one Document object to as many Swing Text Components as
you want (or zero if you want).

Paul King wrote:

> I am not necessarily new to Java, but am a novice at writing GUI-based
> Java programs.
>
> ...
> 
>     txtMessage.text = "Some text";
> 
> hoping it would appear as displayed text in the text pane. The logic of
> using txtMessage.text is that the "text" part appears as a property on my
> CodeWarrior object inspector for the "txtMessage" object. Giving the
> "text" property a value in the object inspector results in that value
> being displayed.

Well, sorry - but "did you hear about beans??". With a bean there might
be a property 'text' and access to it is granted using accessor methods
'getText' and/or 'setText'. this is a common pattern to all beans - and
Swing components are supposed to be beans, too.
No Java style guide misses a phrases stating that the above way (direct
access to class members) is to be dropped from coding practices.
Well, I don't think that it is that seriously wrong, but you might consider
the accessor way - that btw is the way that (almost) every IDE GUI Tool
should do it by recommendation.

btw. i agree to the other posting by "gbp" about using the getDocument()
method for components like JTextPane as JTextPane may encapsulate large
text objects - highlighting and other stuff - like Win$ Write.exe...
given proper coding ;-)
but the text property is not isolated to JTextPane and if you would like
to access anything else having a text property (eg. JButton) please stick
to the accessor. and also the accessor might hide implementations to
update components in the background by calling whatever is necessary to do
so. accessing the member directly would need you to do so and thus involve
dependencies you might not be aware of --- the saying goes: use accessors
where available...

Cheers

Jens

Bill Tschumy wrote:

> On Wed, 21 Mar 2001 18:22:58 -0600, Paul King wrote
> (in message <rihibt42piiu8mbei09uc7o066ll4sramp@4ax.com>):
>
> > I am trying to build a GUI with a text object (JTextPane). I have a need
> > to place display text into that object. Here is the declaration:
> >
> >     javax.swing.JTextPane txtMessage = new javax.swing.JTextPane();
> >
> > Having done that, in the same scope as the current object that the above
> > declaration was in, I placed this statement in one of the methods, a
> > response to pressing a button:
> >
> >     txtMessage.text = "Some text";
> >
>
> >
> > PJK
>
> I don't have any advice about why CodeWarrior is showing that
> property, but to set the text displayed you should do a
>
> txtMessage.setText("Some Text");
>
> --
> Bill Tschumy
> Otherwise -- Austin, TX
> bill@otherwise.com

Probably it's showing all fields, of which "text" would probably be the private
or protected internal field to hold the string that is the text for the
textfield.
--
Bryan E. Sampieri
bryans@avaya.com

The opinions expressed are not necessarily those of Avaya.