[GRASSGUI] Re: python question - waiting for a variable to change

[Michael Barton]

Daniel,

I don't think I explained myself very clearly. Here is what I had in mind.

This is a primitive description of the workflow I'm trying to do

1. module A calls module B

2. module B starts a GUI window that collects user information (d.* command
options)

3. User closes GUI window

4. Information collected in GUI window is returned to module A

5. module A processes information collected in GUI launced by module B

Is your response below related to such a work flow? It's the same idea as
launching a dialog and then invoking the ShowModal() method to wait until it
closes and capture what the dialog does. Does this need to be done via a
dialog only, or can it be emulated with a normal window?

Michael


On 3/19/07 9:24 AM, "Daniel Calvelo" <dca.gis at gmail.com> wrote:

> You could make your callback function (the one you wish executed as
> the value is returned) a parameter to __init__ in menuform, that is
> called from within menuform.onRun if set to stg else than None. I
> think that is what you call a hook.
> 
> You have to build something quite involved to have signaling objects
> behave like normal variables, AFAICT.
> 
> Daniel.
> 
> On 3/19/07, Michael Barton <michael.barton at asu.edu> wrote:
>> 
>>  I've run into a little problem that is taxing my neophyte Python
>> programming abilities. However we do a popup panel for setting display layer
>> options, I think it is necessary to do something along the lines of the
>> following....
>> 
>>  1. Start the options popup. This is currently done with a double click on
>> the layer, which calls the onActivate even handler. For a raster, the event
>> handler uses...
>>          drastcmd = menuform.GUI().parseCommand('d.rast', gmpath)
>>      ...to start the autogenerated GUI.
>> 
>>  2. When you press the "run" button for this d.* command, the assembled
>> command (d.rast + options) is simply returned.
>> 
>>  3. Now drastcmd should contain a complete d.rast command string.
>> 
>>  So, how do I wait in onActivate until the "run" button is pressed on the
>> popup and the information is returned to drastcmd (i.e., the value of
>> drastcmd is changed). Or, alternatively, how can a change in the value of
>> drastcmd generate an event that I can capture and process? I messed around
>> with wait() (thinking about tk_wait in TclTk), but couldn't get it to do
>> what I wanted.
>> 
>> 
>>  Michael
>>  __________________________________________
>>  Michael Barton, Professor of Anthropology
>>  School of Human Evolution & Social Change
>>  Center for Social Dynamics & Complexity
>>  Arizona State University
>> 
>>  phone: 480-965-6213
>>  fax: 480-965-7671
>>  www: http://www.public.asu.edu/~cmbarton
>> 
>> 
> 

__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton