Searching for a ComboBox for Tkinter?

Harlin Seritt harlinseritt at yahoo.com
Sun Mar 13 11:22:07 CET 2005


I've created a ghetto-ized ComboBox that should work nicely for Tkinter
(unfortunately no dropdown capabilities yet).

I've found why it's such a pain in the @ss to create one. You have to
re-create common methods and make sure they're mapped to the right
component (inside this widget are frame, entry, listbox, and scrollbar
widgets). I tried to look for ways I could inherit some methods from
other widgets but couldn't think of how to do it in an efficient way.

If anyone has suggestions to improve it, please respond... Remember...
I'm a traditional c/c++ turned python programmer who forgets that there
usually is a better, faster more graceful way to do things with Python
than with C/C++/Java.

Cheers,

Harlin

######################################################################
# Seritt Extensions:
# Date: 02262005
# Class ComboBox
# Add this section to your Tkinter.py file in 'PYTHONPATH/Lib/lib-tk/'
# Options: width, border, background, foreground, fg, bg, font
#		, relief, cursor, exportselection, selectbackgroun,
selectforeground, height
#
# Methods: activate(int index) => int, curselection() => int,
delete(item=["ALL" or int], start=int, end=["END" or
# int],
# 	focus_set()/focus(), get()=>selected string in box, pack(padx=int,
pady=int,  fill(X, Y, BOTH), expand=bool, # side=LEFT,
# 	RIGHT, TOP, BOTTOM, CENTER
#

class ComboBox:
	ITEMS = range(0)

	def activate(self, index):
		self.listbox.activate(index)

	def curselection(self):
		return map(int, self.listbox.curselection())[0]

	def delete(self, item=None, start=None, end=None):
		if item=='ALL':
			self.listbox.delete(0, END)
		elif start == None and end == None:
			self.listbox.delete(item)
		else:
			self.listbox.delete(start, end)

	def get_focus(self):
		self.entry.get_focus()

	def focus(self):
		self.entry.get_focus()

	def get(self):
		return self.entry.get()

	def pack(self, padx=None, pady=None, fill=None, expand=None,
side=None):
		self.frame.pack(padx=padx
                   , pady=pady
                   , fill=fill
                   , expand=expand
                   , side=side)

	def size(self):
		return self.listbox.size()

	def insert(self, START, ITEM):
		self.ITEMS.append(ITEM)
		self.listbox.insert(START, ITEM)
		self.listbox.select_set(0)
		self.entry.delete(0, END)
		self.entry.insert(0, self.listbox.get(self.listbox.curselection()))

	def change_entry(self, event):
		def i(event):
			try:
				self.entry.delete(0, END)
				self.entry.insert(0, self.listbox.get(self.listbox.curselection()))
			except:
				pass
		self.listbox.bind("<ButtonRelease-1>", i)

	def __init__(self, parent, width=None, border=1, background=None,
foreground=None, fg=None, bg=None, font=None
		, relief=None, cursor=None, exportselection=None,
selectbackgroun=None, selectforeground=None, height=None):
		self.frame = Frame(parent)
		self.entry = Entry(self.frame
			, width=None
			, border=border
			, background=background
			, foreground=foreground
			, fg=fg
			, bg=bg
			, font=font
			, relief=relief
			, cursor=cursor
			, exportselection=exportselection
			, selectbackgroun=selectbackgroun
			, selectforeground=selectforeground
			, height=height)
		self.entry.pack(fill=X)
		self.scroll = Scrollbar(self.frame)
		self.scroll.pack(side=RIGHT, fill=Y)
		self.listbox = Listbox(self.frame
			, yscrollcommand=self.scroll.set
			, width=None
			, border=border
			, background=background
			, foreground=foreground
			, fg=fg
			, bg=bg
			, font=font
			, relief=relief
			, cursor=cursor
			, exportselection=exportselection
			, selectbackgroun=selectbackgroun
			, selectforeground=selectforeground
			, height=height)
		self.listbox.pack(fill=X)
		self.scroll.config(command=self.listbox.yview)
		self.listbox.bind("<ButtonPress-1>", self.change_entry)




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