On 9/3/19 10:13 pm, Alan Gauld via Tutor wrote:
On 09/03/2019 02:53, Chris Roy-Smith wrote:
What is happening is that the contents of the frame appear in the master
window. I was expecting them to show in the second window. Also I
expected the frame to be sunken, but there is no obvious signs of the
frame, not even a colored background.
What am I doing wrong?
Its a very common mistake in Tkinter.
When you use one of the layout managers, in this case grid()
the return value is always None.
def NewWindow():
sw=Toplevel(master)
sw.title('New Window')
Label(sw, text='new window').grid(row=0, column=0)
sframe=Frame(sw, relief=SUNKEN, bg='red').grid(row=1, column=0)
So you are here assigning None to sframe.
Label(sframe, text='Label in a frame').grid(row=2, column=0)
Label(sframe, text='Second label in this frame').grid(row=3, column=0)
And when you pass None as the parent to a widget Tk
defaults to the root. So your widgets appear in your main window.
Change the sframe line to two lines:
sframe=Frame(sw, relief=SUNKEN, bg='red')
sframe.grid(row=1, column=0)
and all will be well....
except the sunken relief wont work.
TYhats because the sunken form requires a border width of at least 2
pixels to be visible. So you need to add border=2 (or more) to make
it work.
So the final line should be:
sframe=Frame(sw, border=2, relief=SUNKEN, bg='red')
sframe.grid(row=1, column=0)
As I say its a very common mistake and so, any time weird things
happen, always check that anywhere you assign a widget to a variable
you call the layout manager on a separate line.
HTH
Thanks Alan,
Simple when you know. I remember having a similar issue with Entry widgets,
Regards, Chris Roy-Smith
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