Tkinter, repaint?, keep size?

[jim-on-linux]

On Sunday 06 April 2008 13:24, 
skanemupp at yahoo.se wrote:
> so my calculator is almost done for u that
> have read my previous posts.
> i have some minor problems i have to fix
> though.
>
> *one is i need to repaint once i have
> performed a calculation so that the old
> results are not left on the screen. cant
> find a method for that.

you can use "wigit".update().
The update method update will redraw wigits 
as necessary.  If you have the state of the 
wigit set to DISABLE then set it to ACTIVE 
before using .update().
 
>
> *another is now when i write the
> expression to be evaluated it resizes the
> window as the text grows.
> i want the windowsize and all the
> buttonplacements  stay constant, how do i
> achieve this?

I like to make a separate frame for buttons.

master = Tk()
master.title =('My Project')

buttonFrame = Frame(master)
buttonFrame.grid(row = 0 column = 1)

you could use a dictionary that contains the  
the text and the command and loop the key to 
build the buttons. Make x = x+1,  y = y+1 
for row and column or otherwise as you need.

button = Button(buttonframe, text = key, 
width = 2)
button1.grid(row = x, column = y, sticky = 
NSEW)

put other stuff into the master using another 
frame and grid it in some other column and  
or row.

If you make all buttons the same size inside 
the frame they will keep their size even if 
you have more text then the button will 
hold.

There is a lot more but this is the way I 
would proceed.


jim-on-linux
http://www.inqvista.com