repaint() but no changes until i minimise then maxamise?

Thread view:

paulobrad@gmail.com - 19 Nov 2005 14:24 GMT

I have an application where entering certain numbers changes the data
held, I had observers looking at these observables and when they are
notified they make changes to what is displayed on screen, one of these

is some swing graphics. I do a repaint() in the observer but when I run

the app nothing happens until i move the window of the screen and back
on again. Is there a way of getting it to actually re draw the window
so I can see the changes instantly?

Many thanks in advance.

Reply to this Message

Andrew Thompson - 19 Nov 2005 15:43 GMT

> I have an application ...

Well gee. Nice to see you found c.l.j.gui so 'fast',
but that leads me to...
<http://www.physci.org/codes/javafaq.jsp#xpost>

Where's your broken SSCCE?
<http://www.physci.org/codes/sscce.jsp>

Signature

Andrew Thompson
physci, javasaver, 1point1c, lensescapes - athompson.info/andrew
Currently accepting short and long term contracts - on Earth.

Reply to this Message

Monique Y. Mudama - 21 Nov 2005 22:12 GMT

> I have an application where entering certain numbers changes the
> data held, I had observers looking at these observables and when
[quoted text clipped - 9 lines]
>
> Many thanks in advance.

I think Swing components are supposed to use paintComponent() instead
of repaint() ..?

Signature

monique

Ask smart questions, get good answers:
http://www.catb.org/~esr/faqs/smart-questions.html

Reply to this Message

Thomas Hawtin - 22 Nov 2005 12:20 GMT

> I think Swing components are supposed to use paintComponent() instead
> of repaint() ..?

You are thinking of paint. paint/paintComponent are methods to override
in order to insert code that draws something on the component. repaint
indicates the component is 'damaged' and requests that the component be
redrawn at some point.

In this case, perhaps repaint isn't being called at all, or called on
the wrong object, or has threading issues, or something else. Who knows?

Tom Hawtin

Signature

Unemployed English Java programmer
http://jroller.com/page/tackline/

Reply to this Message

Monique Y. Mudama - 22 Nov 2005 17:51 GMT

>> I think Swing components are supposed to use paintComponent()
>> instead of repaint() ..?
[quoted text clipped - 3 lines]
> component. repaint indicates the component is 'damaged' and requests
> that the component be redrawn at some point.

Oopsie.

> In this case, perhaps repaint isn't being called at all, or called
> on the wrong object, or has threading issues, or something else. Who
> knows?

Not I!

Signature

monique

Ask smart questions, get good answers:
http://www.catb.org/~esr/faqs/smart-questions.html

Reply to this Message

JediJ - 22 Nov 2005 20:02 GMT

Try using invalidate()

Reply to this Message

repaint() but no changes until i minimise then maxamise?

Free Magazines