Bob Greschke wrote:
> I don't use classes much (mainly because I'm stupid), but I'd like to make a
> subclass of the regular Tkinter Button widget that simply adds spaces to the
> passed "text=" when the program is running on Windows (Linux, Solaris, Mac
> add a little space between the button text and the right and left edges of a
> button, Windows does not and it looks bad/can be hard to read). Below is
> some pseudo code. What should the guts of the BButton class be? I can't
> work out how all of the arguments that would be passed to a regular Button
> call get handled. *args and **kw confuse me and I can't seem to find simple
> enough examples in my mountain of books.
So watch this:
<code>
import Tkinter as Tk
import sys
class MyButton(Tk.Button):
system = sys.platform[:3] # 1
def __init__(self, master=None, **kw): # 2 3
if self.system == "win":
kw["padx"] = kw.get("padx", 0) + 5 # 4
# alternative solution
# if "text" in kw and self.system == "win":
# kw["text"] = " " + kw["text"] + " "
Tk.Button.__init__(self, master, **kw) # 5
</code>
1. system is a class attribute, so is shared by the class and all
instances of the class
2. __init__ is called immediately after an instance of the class
is created
3. kw is a dictionary of button options for example:
{"text": "Hello", "padx": 2}
4. change value of element "padx" or add this element to dictionary kw
5. call parent __init__ method to create button
HTH,
Rob
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