James Stroud wrote:
> Kevin Walzer wrote:
>
>> I'm trying to set the active item in a Tkinter listbox to my
>> application's currently-defined default font.
>>
>> Here's how I get the fonts loaded into the listbox:
>>
>> self.fonts=list(tkFont.families())
>> self.fonts.sort()
>>
>> for item in self.fonts:
>> self.fontlist.insert(END, item) #self.fontlist is the
>> ListBox instance
>>
>>
>> So far, so good. But I don't know how to set the active selection in
>> the listbox to the default font. All the methods for getting or
>> setting a selection in the listbox are based on index, not a string.
>> And using standard list search methods like this:
>>
>> if "Courier" in self.fontlist:
>> print "list contains", value
>> else:
>> print value, "not found"
>>
>> returns an error:
>>
>> TypeError: cannot concatenate 'str' and 'int' objects
>>
>> So I'm stuck. Can someone point me in the right direction?
>
>
> I would keep a separate data structure for the fonts and update the
> scrollbar when the list changed. This would help to separate the
> representation from the data represented. Here is a pattern I have found
> most useful and easy to maintain:
>
> # untested
> class FontList(Frame):
> def __init__(self, *args, **kwargs):
> Frame.__init__(self, *args, **kwargs)
> self.pack()
> self.fonts = list(kwargs['fonts'])
> self.default = self.fonts.index(kwargs['default_font'])
> self.lb = Listbox(self)
> # add scrollbar for self.lb, pack scrollbar
> # pack self.lb
> self.set_bindings()
> self.update()
> def set_bindings(self):
> # put your bindings and behavior here for FontList components
> def update(self):
> self.lb.delete(0, END)
> for f in self.fonts:
> self.lb.insert(f)
> self.highlight()
> def highlight(self):
> index = self.default
> self.lb.see(index)
> self.lb.select_clear()
> self.lb.select_adjust(index)
> self.lb.activate(index)
> def change_font(self, fontname):
> self.default = self.fonts.index(fontname)
> self.highlight()
> def add_font(self, fontname, index=None):
> if index is None:
> self.fonts.append(fontname)
> else:
> self.fonts.insert(index, fontname)
> self.update()
> # other methods for adding multiple fonts or removing them, etc.
>
>
I overlooked that you will actually want to remove "fonts" and
"default_fonts" from kwargs before initializing with Frame:
# untested
class FontList(Frame):
def __init__(self, *args, **kwargs):
self.fonts = list(kwargs['fonts'])
self.default = self.fonts.index(kwargs['default_font'])
kwargs.pop('fonts')
kwargs.pop('default_font')
Frame.__init__(self, *args, **kwargs)
self.pack()
self.lb = Listbox(self):
# etc.
James
--
James Stroud
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095
http://www.jamesstroud.com/
--
http://mail.python.org/mailman/listinfo/python-list
