Tkinter grid autosize help
Terry Reedy
tjreedy at udel.edu
Sat Aug 2 23:22:29 EDT 2014
On 8/2/2014 10:16 PM, Terry Reedy wrote:
> On 8/2/2014 6:53 PM, Nicholas Cannon wrote:
>> The only way i can make the buttons look neat and then when i keep
>> pressing one the label gets larger and then half the buttons
>> move out of the screen
With my code below, I tried entering a 20 digit number and the button
boxes separate horizontally. This is not exactly what you describe, but
it does mess up the initially neat display.
>> is there a way i can stop the grid from expanding?
One thing I might do, besides using an entry box, it to grid the buttons
in a separate frame. I wrote the code below, with the header_rows
variable, with that in mind.
> This sort of repetitious code is crying for a loop. For one thing, if
> you want to change the buttons, there should only be one Button call to
> modify. Since I am still learning to write tkinter myself, I wrote the
> following, which I suspect does what you wanted and a bit more.
>
> from tkinter import *
>
> main = Tk()
> main.title('Calculator')
> main.geometry('300x350')
> #main.resizable() # does nothing
>
> app = Frame(main)
> app.grid()
>
> total = IntVar()
> total.set(0)
> entry = StringVar()
> entry.set('')
>
> Label(app, text='Total').grid(row=0, column=0)
> Label(app, textvariable=total).grid(row=0, column=1, columnspan=3)
> Label(app, text='Entry').grid(row=1, column=0)
> Label(app, textvariable=entry).grid(row=1, column=1, columnspan=3)
>
> def append(digit):
> entry.set(entry.get() + digit)
>
> def add():
> total.set(total.get() + int(entry.get()))
> entry.set('')
> def sub():
> total.set(total.get() - int(entry.get()))
> entry.set('')
>
> header_rows = 2
> for num, r, c in (
> ('7', 0, 0), ('8', 0, 1), ('9', 0, 2),
> ('4', 1, 0), ('5', 1, 1), ('6', 1, 2),
> ('1', 2, 0), ('2', 2, 1), ('3', 2, 2),
> ('0', 3, 0), ('+', 3, 1), ('-', 3, 2),):
> cmd = {'+':add, '-':sub}.get(num, lambda num=num: append(num))
> b = Button(app, text=num, command=cmd, width=5)
> b.grid(row=header_rows+r, column=c)
>
> main.mainloop()
With regard to your next message: If you do not understand the function
definitions above, including the lambda expression, and the loop, you
should definitely look more at the tutorial.
--
Terry Jan Reedy
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