Re: Swing - paintComponent not called
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"Bojan" <srbijan@gmail.com> wrote in message =
news:c7239492-1367-41cf-a00f-610dca79485d@e2g2000vbe.googlegroups.com...
On Apr 8, 1:13 pm, "Matt Humphrey" <ma...@iviz.com> wrote:
> "Bojan" <srbi...@gmail.com> wrote in message
>
> =
news:17546d5d-1f94-44d7-b556-c62efca334da@r3g2000vbp.googlegroups.com...
>
> > Hi all,
>
> > For some reason the paintComponent is never called to print the
> > image. The image is valid, i have tested it with =
setIconImage(image)
> > and it worked fine. Why is the paintComponent never called? Any =
help
> > would be appreciated. Thanks in Advance.
>
> > The ProgressFrame is called from a run method, which is in a class
> > that implements Runnable. Which is called by creating a new =
thread.
>
> > Here is the code for the ProgressFrame:
>
> <snip>
>
> Works for me--draws the image (when main added.) Are you sure =
busy.jpg is in
> the correct location or that Resources is capitalized correctly? It =
is best
> also to launch the window from the EDT as in:
>
> SwingUtilities.invokeLater (new Runnable () {
> public void run () {
> ProgressFrame pf = new ProgressFrame ();
> }
> });
>
> Matt Humphreyhttp://www.iviz.com/
That does work. But I forgot to mention that I am calling the method
from actionPerformed(ActionEvent ae).
A main frame has menu items that correspond to actions. When one of
them is executed it checks if ae.getSource equals to the menu item.
E.g.
JMenuItem source = (JMenuItem) ae.getSource();
if (source == open) {
openFile();
}
else if (...
When openFile is called, which creates the new thread... it does not
show the image.
Whoa! Hold on there! This is a completely different problem.
If you're creating a new thread, there are various constraints on how =
you can update the GUI from that thread. If you are attempting to do =
more than repaint, revalidate or invalidate you should expect to have =
problems. Virtually all other Swing methods must take place on the EDT.
When you say you are "calling the method from actionPerformed" do you =
mean paintComponent or some method --as yet not shown-- which invokes =
new ProgressFrame () ? I'm guessing the latter in which case your main =
problem is probably threading, but if not calling paintComponent is =
probably the wrong thing to do anyway.
You will have to show what openFile does and explain how it connects to =
new ProgressFrame. At this point it would probably be best if you put =
together a test program that actually demonstrates the problem (as =
opposed to the code you sent that does not.)
Matt Humphrey http://www.iviz.com/
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<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>"Bojan" <</FONT><A
href="mailto:srbijan@gmail.com"><FONT face=Arial
size=2>srbijan@gmail.com</FONT></A><FONT face=Arial size=2>> =
wrote in message
</FONT><A
href="news:c7239492-1367-41cf-a00f-610dca79485d@e2g2000vbe.googlegroups=
..com"><FONT
face=Arial
size=2>news:c7239492-1367-41cf-a00f-610dca79485d@e2g2000vbe.googlegroup=
s.com</FONT></A><FONT
face=Arial size=2>...</FONT></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV><FONT face=Arial size=2>On Apr 8, 1:13 pm, "Matt Humphrey" =
<</FONT><A
href="mailto:ma...@iviz.com"><FONT face=Arial
size=2>ma...@iviz.com</FONT></A><FONT face=Arial size=2>> =
wrote:<BR>>
"Bojan" <</FONT><A href="mailto:srbi...@gmail.com"><FONT =
face=Arial
size=2>srbi...@gmail.com</FONT></A><FONT face=Arial size=2>> =
wrote in
message<BR>><BR>> </FONT><A
=
href="news:17546d5d-1f94-44d7-b556-c62efca334da@r3g2000vbp.googlegroups=
..com"><FONT
face=Arial
=
size=2>news:17546d5d-1f94-44d7-b556-c62efca334da@r3g2000vbp.googlegroup=
s.com</FONT></A><FONT
face=Arial size=2>...<BR>><BR>> > Hi all,<BR>><BR>> =
> For
some reason the paintComponent is never called to print the<BR>> =
>
image. The image is valid, i have tested it with =
setIconImage(image)<BR>>
> and it worked fine. Why is the paintComponent never called? Any
help<BR>> > would be appreciated. Thanks in =
Advance.<BR>><BR>>
> The ProgressFrame is called from a run method, which is in a
class<BR>> > that implements Runnable. Which is called by =
creating a new
thread.<BR>><BR>> > Here is the code for the
ProgressFrame:<BR>><BR>> <snip><BR>><BR>> Works for
me--draws the image (when main added.) Are you sure busy.jpg is =
in<BR>> the
correct location or that Resources is capitalized correctly? It is
best<BR>> also to launch the window from the EDT as =
in:<BR>><BR>>
SwingUtilities.invokeLater (new Runnable () {<BR>> public void run =
()
{<BR>> ProgressFrame pf = new ProgressFrame ();<BR>> }<BR>> =
});<BR>><BR>> Matt Humphreyhttp://www.iviz.com/<BR><BR>That does =
work.
But I forgot to mention that I am calling the method<BR>from
actionPerformed(ActionEvent ae).<BR><BR>A main frame has menu items =
that
correspond to actions. When one of<BR>them is executed it checks =
if
ae.getSource equals to the menu item.<BR>E.g.<BR>JMenuItem source =
(JMenuItem) ae.getSource();<BR>if (source == open) {<BR>
openFile();<BR>}<BR>else if (...<BR><BR>When openFile is called, which =
creates
the new thread... it does not<BR>show the =
image.</FONT></DIV></BLOCKQUOTE>
<DIV><FONT face=Arial size=2>Whoa! Hold on there! This is a =
completely
different problem.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>If you're creating a new thread, there =
are various
constraints on how you can update the GUI from that =
thread. If you
are attempting to do more than repaint, revalidate or invalidate =
you should
expect to have problems. Virtually all other Swing =
methods must
take place on the EDT.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>When you say you are "calling the =
method from
actionPerformed" do you mean paintComponent or some method --as yet =
not
shown-- which invokes new ProgressFrame () ? I'm guessing the =
latter in
which case your main problem is probably threading, but if not calling
paintComponent is probably the wrong thing to do anyway.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>You will have to show what openFile =
does and
explain how it connects to new ProgressFrame. At this point it =
would
probably be best if you put together a test program that actually =
demonstrates
the problem (as opposed to the code you sent that does =
not.)</FONT></DIV>
<DIV><FONT face=Arial size=2><BR>Matt Humphrey <A
href="http://www.iviz.com/">http://www.iviz.com/</A> =
</FONT></DIV></BODY></HTML>
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