Class for custom Tkinter widget--difficulty

[Kevin Walzer]

I'm trying to create a custom Tkinter widget class, and I'm having some
difficulty getting it set up properly.

The class is called MacToolbar, saved in its own module MacToolbar.py,
and imported with this statement:

import MacToolbar

Here is the relevant portion of the class:

###relevant class code

class MacToolbar:
def __init__(self, master):
self.tk.call("p ackage", "require", "macsearchfield ")
self.tk.call('p ackage', 'require', 'tile')
def create(self):
self.baseframe = Tile.Frame(self , master)
self.baseframe. pack(side='top' , fill='both', expand='no')
def toolbar(self):
self.create()
self.newframe = Tile.Frame(self .baseframe)
self.newframe.p ack(fill='both' , expand='yes')

self.buttonfram e = Tile.Frame(self .newframe)
self.buttonfram e.pack(side='to p', fill='both', expand = 'yes')
I'm a bit confused on how to call a class that is imported via a module.
Both approaches I try produce errors:

The first approach:

self.topframe = MacToolbar.tool bar(self.mainfr ame)

yields this error:

AttributeError: 'module' object has no attribute 'toolbar'

The second approach:

self.topframe = MacToolbar.MacT oolbar.toolbar( self.mainframe)

yields this error:

TypeError: unbound method toolbar() must be called with MacToolbar
instance as first argument (got Frame instance instead)

I was expecting to be able to use the standard Class.Method notation in
calling MacToolbar class methods, but it appears that this does not work
at all: that's what I see in the first error above. Instead I have to
use Module.Class.Me thod notation? I've never seen this before.

Can someone point out what I am doing wrong, either in the construction
of the class, the way it's imported, or in how I'm calling methods?

--
Kevin Walzer
Code by Kevin
http://www.codebykevin.com

[Gabriel Genellina]

En Mon, 17 Sep 2007 17:11:03 -0300, Kevin Walzer <kw@codebykevin .com>
escribi�:

I'm trying to create a custom Tkinter widget class, and I'm having some
difficulty getting it set up properly.

The class is called MacToolbar, saved in its own module MacToolbar.py,
and imported with this statement:

import MacToolbar

Here is the relevant portion of the class:

###relevant class code

class MacToolbar:
def __init__(self, master):
self.tk.call("p ackage", "require", "macsearchfield ")
self.tk.call('p ackage', 'require', 'tile')
def create(self):
self.baseframe = Tile.Frame(self , master)
self.baseframe. pack(side='top' , fill='both', expand='no')
def toolbar(self):
self.create()
self.newframe = Tile.Frame(self .baseframe)
self.newframe.p ack(fill='both' , expand='yes')

self.buttonfram e = Tile.Frame(self .newframe)
self.buttonfram e.pack(side='to p', fill='both', expand = 'yes')
I'm a bit confused on how to call a class that is imported via a module.
Both approaches I try produce errors:

self.topframe = MacToolbar.tool bar(self.mainfr ame)
self.topframe = MacToolbar.MacT oolbar.toolbar( self.mainframe)

[...] I was expecting to be able to use the standard Class.Method
notation in
calling MacToolbar class methods, but it appears that this does not work
at all: that's what I see in the first error above. Instead I have to
use Module.Class.Me thod notation? I've never seen this before.

Can someone point out what I am doing wrong, either in the construction
of the class, the way it's imported, or in how I'm calling methods?

You have to create an instance, and then you call methods on that instance.
But toolbar() doesn't look like a method; both the create and toolbar
methods appear to create the toolbar itself; probably you should move all
that code into __init__.
Perhaps you should inherit from Frame?

Given the kind of mistakes you have, I suggest you read something about
classes and object orientation in Python. (Maybe you have used a lot of
classes, but perhaps this is the first class you *design*?)

--
Gabriel Genellina