Returning a value from a Tk dialog

[Gordon Airporte]

The dialogs in tkColorChooser, tkFileDialog, etc. return useful values
from their creation somehow, so I can do stuff like this:

filename = tkFileDialog.as kopenfilename( master=self )

I would like to make a Yes/No/Cancel dialog that can be used the same
way (returning 1/0/-1), but I just cannot figure out how to do it. At
best I've been able to get some kind of instance id from the object. How
does this work?

[Ron Adam]

Re: Returning a value from a Tk dialog



Gordon Airporte wrote:[color=blue]
> The dialogs in tkColorChooser, tkFileDialog, etc. return useful values
> from their creation somehow, so I can do stuff like this:
>
> filename = tkFileDialog.as kopenfilename( master=self )
>
> I would like to make a Yes/No/Cancel dialog that can be used the same
> way (returning 1/0/-1), but I just cannot figure out how to do it. At
> best I've been able to get some kind of instance id from the object. How
> does this work?[/color]

All of the dialogs you mention use functions as a caller. And then the
function is returning the result.


From tkColorChooser. ..

def askcolor(color = None, **options):
"Ask for a color"

if color:
options = options.copy()
options["initialcol or"] = color

return Chooser(**optio ns).show()


In this case the Chooser(**optio ns) initiates the dialog, and then the
show() method is called and it returns the value. The return line above
is the same as...

cc = Chooser(**optio ns)
color = cc.show()
return color

The other dialogs work in same way. They are all based on
tkCommonDialog, so look in tkCommonDialog. py to see exactly what's going on.

Cheers,
Ron

[Fredrik Lundh]

Re: Returning a value from a Tk dialog

Gordon Airporte wrote:
[color=blue]
> The dialogs in tkColorChooser, tkFileDialog, etc. return useful values
> from their creation somehow, so I can do stuff like this:
>
> filename = tkFileDialog.as kopenfilename( master=self )
>
> I would like to make a Yes/No/Cancel dialog that can be used the same
> way (returning 1/0/-1), but I just cannot figure out how to do it. At
> best I've been able to get some kind of instance id from the object. How
> does this work?[/color]

if you want a message box, use the tkMessageBox module. there's
no ready-made wrapper for yes/no/cancel, but you can call the _show
directly:

import tkMessageBox
result = tkMessageBox._s how(
"title", "message", tkMessageBox.QU ESTION, tkMessageBox.YE SNOCANCEL
)

result will be tkMessageBox.YE S, tkMessageBox.NO , or tkMessageBox.CA NCEL.

if result == tkMessageBox.YE S:
return 1
if result == tkMessageNox.No :
return 0
return -1 # assume cancel

</F>