Tkinter Spinbox

Hi

I need a spinbox which when created can read a variable (which is an integer) from another location and use that variable for the starting value. i also need to only allow integers be input into the text field by keyboard (and only has high as 999). lastly, whenever the spinbox value is changed (either by keyboard input or by clicking on the arrows) i need to be able to verify that it is an integer and then save its value into another location.

i have tried to do these things but without success. currently i have this (it has been cut out of my main program:

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1.  resistanceEntry = Spinbox(resistorFrame, from_=1, to=999, width=10, wrap=True, validate=ALL, validatecommand=validate)
2.  
3. def validate():
4.     print "VALIDATE" 

i noticed that even with validate set to ALL it only runs the command validate once and that is when the spinbox is first created.

any help would be greatly appreciated, but please try and keep it simple i am still very new to this

thanks

Hi

I need a spinbox which when created can read a variable (which is an integer) from another location and use that variable for the starting value. i also need to only allow integers be input into the text field by keyboard (and only has high as 999). lastly, whenever the spinbox value is changed (either by keyboard input or by clicking on the arrows) i need to be able to verify that it is an integer and then save its value into another location.

i have tried to do these things but without success. currently i have this (it has been cut out of my main program:

Expand|Select|Wrap|Line Numbers

1.  resistanceEntry = Spinbox(resistorFrame, from_=1, to=999, width=10, wrap=True, validate=ALL, validatecommand=validate)
2.  
3. def validate():
4.     print "VALIDATE" 

i noticed that even with validate set to ALL it only runs the command validate once and that is when the spinbox is first created.

any help would be greatly appreciated, but please try and keep it simple i am still very new to this

thanks

EDIT: also how would i write the validate function i had the idea of this (below) but it seems very inefficient there must be a better way

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1.  
2. def validate(input)
3.    for i in range (1000):
4.       if i == input:
5.          return True
6.    (...etc...)
7.  

thank you so much :) when i return true then it validates every time, now all i need is get the spinbox value to start at a specific value, any ideas?

In the Frame's __init__(), keep a reference:

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1. self.resistanceEntry = Spinbox(resistorFrame, from_=1, to=999, width=10, wrap=True, validate=ALL, validatecommand=validate)

Then, any time you want to, the a Frame method can

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1. resistanceEntry.set(value)

or you can might be able to

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1. STARTVALUE = 100   # or whatever
2. resistanceEntry = Spinbox(resistorFrame, from_=1, to=999,
3.                           value=STARTVALUE, width=10, wrap=True,
4.                           validate=ALL, validatecommand=validate)

Of, course, you'll have to experiment because I have not tested this.

Do you know where to find/have the on-line Tkinter reference???

Something like this:

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1. >>> def validate(v):
2. ...     if isinstance(v, int) and v > 0 and v < 1000:
3. ...         return True
4. ...     else:
5. ...         return False
6. ...     
7. >>> validate(6)
8. True
9. >>> validate(0)
10. False
11. >>> validate(999)
12. True
13. >>> validate(1000)
14. False
15. >>> if validate(v):
16. ...     print 'Do some stuff'
17. ...     
18. Do some stuff
19. >>> 

this is perfect except how would you write isinstance? (its not a built in is it?)

worked that part out, only the second part applies :)

I fixed the event-sequence problem using an IntVar and trace().
I will ask you to consider designing you resistor model as a subclass of Frame, as follows:

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1.  
2. class ResistorModel(Frame):
3.     """A subclass of Tkinter.Frame for modeling a resistor using IntVar."""
4.     def __init__(self, root, powerRating, *args, **kwargs):
5.         Frame.__init__(self, root, *args, **kwargs)
6.         self.powerRating = powerRating
7.         self.Ohms = IntVar()
8.         self.Ohms.trace('w', self.validateOhms)
9.  
10. ##        label = Label()
11.  
12.         self.resistanceEntry = Spinbox(self, from_=1, to=999, width=10, wrap=True,
13.                                        validate="all", textvariable=self.Ohms)  #use get() to find entry
14. ##        self.resistanceEntry.config(validatecommand=self.validateOhms)
15.         self.resistanceEntry.grid(column=1, row=1, sticky=N+E)
16.  
17.     def validateOhms(self, *args):
18.         print "VALIDATE OHMS"
19.         toValidate = self.Ohms.get()
20.  
21.         print toValidate, type(toValidate)
22.         return True
23.  
24.  
25. if __name__ == "__main__":
26.     root = Tk()
27.  
28.     frame = ResistorModel(root, 10)
29.     frame.pack()
30.  

wow it works :) thank you so much your code is fantastic and with minimal modification this can easily be placed directly into my program.

i apologise for the late reply but i have been swamped over the last few weeks and have not had any time to work on my program

:)