jython-users

[Jython-users] displayedMnemonic in JLabel

[Richard C. <rp...@op...>]

if I write (in tst.py)

from javax.swing import *
b=JLabel("bob", displayedMnemonic=66)

jython tst.py gives:

Traceback (innermost last):
  File "tst.py", line 2, in ?
AttributeError: read-only attr: displayedMnemonic

If I have this:

from javax.swing import *

class Dummy(JPanel):
   pass

b=JLabel("bob", displayedMnemonic=66)

Then I get no complaint. Am I doing something wrong?

Also, because displayedMnemonic is an int property,

b=JLabel("bob", displayedMnemonic='b')
fails (can't convert string to int)

but
b.setDisplayedMnemonic('b') works OK because presumably it calls 
setDisplayedMnemonic(char)

Is there a way to set displayedMnemonic in the constructor more naturally?

Thanks, Richard

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Re: [Jython-users] displayedMnemonic in JLabel

[Ted B. <te...@et...>]

On Monday 10 September 2001 09:17, Richard Cook wrote:
> if I write (in tst.py)
>
> from javax.swing import *
> b=JLabel("bob", displayedMnemonic=66)
>
> jython tst.py gives:
>
> Traceback (innermost last):
>   File "tst.py", line 2, in ?
> AttributeError: read-only attr: displayedMnemonic
>
> If I have this:
>
> from javax.swing import *
>
> class Dummy(JPanel):
>    pass
>
> b=JLabel("bob", displayedMnemonic=66)
>
> Then I get no complaint. Am I doing something wrong?
>
> Also, because displayedMnemonic is an int property,
>
> b=JLabel("bob", displayedMnemonic='b')
> fails (can't convert string to int)
>
> but
> b.setDisplayedMnemonic('b') works OK because presumably it calls
> setDisplayedMnemonic(char)
>
> Is there a way to set displayedMnemonic in the constructor more naturally?
>

b = JLabel( "bob", displayedMnemonic=ord( 'b' ) )

ted

Re: [Jython-users] displayedMnemonic in JLabel

[<bc...@wo...>]

[Richard Cook]

>if I write (in tst.py)
>
>from javax.swing import *
>b=JLabel("bob", displayedMnemonic=66)
>
>jython tst.py gives:
>
>Traceback (innermost last):
>  File "tst.py", line 2, in ?
>AttributeError: read-only attr: displayedMnemonic
>
>If I have this:
>
>from javax.swing import *
>
>class Dummy(JPanel):
>   pass
>
>b=JLabel("bob", displayedMnemonic=66)
>
>Then I get no complaint. 

Strange. It seems like the sequence of reflected methods is different
when the Dummy class exists. I have no explanation for this at the
moment.

>Am I doing something wrong?

No, it is bug in jython. Feel free to add a bug report on sourceforge
with your example.

The bug is triggered because there is two setDisplayedMnemonic(..)
methods. As a result, jython can't decide what the type of the property
should be. Since there can only be one property with the name
'displayedMnemonic' it is either a read/write integer property or a
read-only character property. Which it is, depends on the sequence the
methods is returned from java reflection.

>Also, because displayedMnemonic is an int property,
>
>b=JLabel("bob", displayedMnemonic='b')
>fails (can't convert string to int)
>
>but
>b.setDisplayedMnemonic('b') works OK because presumably it calls 
>setDisplayedMnemonic(char)

Right. Here the properties is skipped altogether and the method is
called directly.

regards,
finn