Ray wrote:
> hi, I have a question about how to use .grid_forget (in python/TK)
>
> I need to work on grid repeatly. everytime when a button is pressed,
> the rows of grid is different. such like, first time, it generate 10
> rows of data.
> 2nd time, it maybe only 5 rows. so I need a way to RESET the grid data
> every time. how can I do it? by grid_forger()?, then would anyone can
> help on
> how to use grid_forget()
> the sample code as following:
>
> #####begin of program###############
>
> from Tkinter import *
> def mygrid(text):
> ######## how to use grid_forget() to clean the grid??###########
> rows = []
> count=int(text)
> for i in range(count):
> cols = []
> for j in range(4):
> e = Entry(frame3, relief=RIDGE)
> e.grid(row=i, column=j, sticky=NSEW)
> e.insert(END, '%d.%d' % (i, j))
> cols.append(e)
> rows.append(cols)
>
>
> root=Tk()
>
> frame1=Frame(root, width=150, height=100)
> frame1.pack()
>
> text=Entry(frame1)
> text.pack(side=LEFT)
>
> button=Button(frame1, text='generate grid', command=(lambda:
> mygrid(text.get())))
>
> button.pack()
>
> frame2=Frame(root, width=150, height=100)
> frame2.pack()
>
> button2=Button(frame2, text='exit', command=root.quit)
> button2.pack()
>
> frame3=Frame(root, width=150, height=300)
> frame3.pack()
>
> root.mainloop()
>
> #####end of program###############
Using grid_forget() is probably optimization overkill, but may be handy
for slower computers where you can watch the widgets appear one by one
(older than about 5 years--for example original mac ibook). Also, you
should get a good book on Tkinter because your design here will pretty
difficult to maintain and is not very flexible.
But...if you want to know how it might be done with grid_forget using
the code you already have (i.e. making widgets only if necessary):
#START#
from Tkinter import *
from tkMessageBox import showerror
def mygrid(text):
######## how to use grid_forget() to clean the grid??###########
numrows = len(frame3.rows)
try:
count=int(text)
except:
showerror('Entry Error',
'''Hey, "%s" don't make an int, Fool!''' % text,
parent=frame3)
return 'break'
for i in range(count):
if i < numrows:
cols = frame3.rows[i]
else:
cols = [Entry(frame3, relief=RIDGE) for j in range(4)]
frame3.rows.append(cols)
for j in range(4):
e = cols[j]
e.grid(row=i, column=j, sticky=NSEW)
e.delete(0,END)
e.insert(END, '%d.%d' % (i, j))
for i in range(i+1, numrows):
for e in frame3.rows[i]:
e.grid_forget()
root=Tk()
frame1=Frame(root, width=150, height=100)
frame1.pack()
text=Entry(frame1)
text.pack(side=LEFT)
button=Button(frame1, text='generate grid', command=(lambda:
mygrid(text.get())))
button.pack()
frame2=Frame(root, width=150, height=100)
frame2.pack()
button2=Button(frame2, text='exit', command=root.quit)
button2.pack()
frame3=Frame(root, width=150, height=300)
# adding an attribute here
frame3.rows = []
frame3.pack()
root.mainloop()
#END#
Notice also the necessity for the "e.delete(0, END)" line to get the
desired text in the entries.
Also demonstrated is how to handle poor input.
*Note*
Remember to always call the user "Fool" when he does something stupid.
James
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