Tkinter - getting canvas window size

[Rick Pasotto]

On Tue, 18 Sep 2001 17:41:51 GMT in comp.lang.python, Fredrik Lundh

Why do the print statements in the following program show zero?

"cget" returns the option value as specified (or in this case, the
default value), not the actual size.

How do I get the actual size? The packed label might or might not
contain a nl. I don't necessarily know the font size. I need to know
the height of the frame (inside the canvas.create_window()) so I can
position another one underneath it.

How can I figure out the size of the frame?

Use winfo_width/height (current size) or winfo_reqwidth/reqheight
(requested size). the latter is usually what you want.

This always gives '1' as an answer no matter the actual size.
winfo_geometry also always gives 1x1+0+0.

How do I get this to work with the integer that canvas.create_window()
returns?

http://www.pythonware.com/library/tkinter/introduction/basic-widget-methods.htm
=> Window Related Information

This is not helping me for widgets placed on a canvas.

[Fredrik Lundh]

Why do the print statements in the following program show zero?

"cget" returns the option value as specified (or in this case, the
default value), not the actual size.

How can I figure out the size of the frame?

Use winfo_width/height (current size) or winfo_reqwidth/reqheight
(requested size). the latter is usually what you want.

more info here:

http://www.pythonware.com/library/tkinter/introduction/basic-widget-methods.htm
=> Window Related Information

</F>

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[Rick Pasotto]

Why do the print statements in the following program show zero?
How can I figure out the size of the frame?

from Tkinter import *

w = Tk()
cnv = Canvas(w,bg='white',relief=SUNKEN)
cnv.config(width=400,height=200)
cnv.pack(side=LEFT,expand=YES,fill=BOTH)

f = Frame(cnv,relief=GROOVE,borderwidth=2)
for j in range(5):
l = Label(f,text='label: %2d' % (j),
relief=GROOVE,borderwidth=2,padx=5)
l.pack(side=LEFT,expand=YES,fill=X,padx=5,pady=2)
f.pack()
cw = cnv.create_window(20,20,window=f,anchor=NW)

print f.cget('height'),f.cget('width')
print cnv.itemcget(cw,'height'), cnv.itemcget(cw,'width')

w.mainloop()