Listbox megawidget showing ordered strings. It's possible to ignore case. I also provided an auto scrollbar option.
Python, 190 lines
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# Uncomment the next line to see my email
# print("Author's email: %s"%"61706c69636163696f6e616d656469646140676d61696c2e636f6d".decode("hex"))
try:
from Tkinter import Frame, Listbox
from ttk import Scrollbar
from Tkconstants import *
except ImportError:
from tkinter import Frame, Listbox
from tkinter.ttk import Scrollbar
from tkinter.constants import *
def make_autoscroll(sbar, first, last):
"""Hide and show scrollbar as needed."""
first, last = float(first), float(last)
if first <= 0 and last >= 1:
sbar.grid_remove()
else:
sbar.grid()
sbar.set(first, last)
def bisect(list_of_items, item, ascending_order=True, ignore_case=False):
lo = 0
hi = len(list_of_items)
# I repeat a little bit myself here because I want to be more efficient.
if ascending_order:
if ignore_case:
item = item.lower()
while lo < hi:
mid = (lo+hi)//2
if item < list_of_items[mid].lower(): hi = mid
else: lo = mid+1
else:
while lo < hi:
mid = (lo+hi)//2
if item < list_of_items[mid]: hi = mid
else: lo = mid+1
else:
if ignore_case:
item = item.lower()
while lo < hi:
mid = (lo+hi)//2
if item > list_of_items[mid].lower(): hi = mid
else: lo = mid+1
else:
while lo < hi:
mid = (lo+hi)//2
if item > list_of_items[mid]: hi = mid
else: lo = mid+1
return lo
class Ordered_Listbox(Frame):
def __init__(self, master, data=None, ascending_order = True, ignore_case=False, autoscroll=False, vscrollbar=True, hscrollbar=False, scrollbar_background=None, scrollbar_troughcolor=None, **kwargs):
Frame.__init__(self, master)
self._ignore_case = ignore_case
self._ascending_order = ascending_order
master.grid_rowconfigure(0, weight=1)
master.grid_columnconfigure(0, weight=1)
self._listbox = Listbox(self, *kwargs)
self._listbox.grid(row=0, column=0, sticky= N+E+W+S)
scrollbar_kwargs = {}
if scrollbar_background is not None:
scrollbar_kwargs["background"] = scrollbar_background
if scrollbar_troughcolor is not None:
scrollbar_kwargs["throughcolor"] = scrollbar_troughcolor
if vscrollbar:
self._vbar=Scrollbar(self,takefocus=0, command=self._listbox.yview, **scrollbar_kwargs)
self._vbar.grid(row=0, column=1, sticky= N+S)
if autoscroll:
self._listbox.config(yscrollcommand=lambda f, l: make_autoscroll(self._vbar, f, l))
else:
self._listbox.config(yscrollcommand=self._vbar.set)
if hscrollbar:
self._hbar=Scrollbar(self,takefocus=0, command=self._listbox.xview, **scrollbar_kwargs)
self._hbar.grid(row=0, column=1, sticky= E+W)
if autoscroll:
self._listbox.config(xscrollcommand=lambda f, l: make_autoscroll(self._hbar, f, l))
else:
self._listbox.config(xscrollcommand=self._hbar.set)
if data is not None:
for item in data:
self.add_item(item)
def add_item(self, item):
list_of_items = self._listbox.get(0, END)
index = bisect(list_of_items, item, ignore_case=self._ignore_case, ascending_order=self._ascending_order)
self._listbox.insert(index, item)
def delete_item(self, item):
list_of_items = self._listbox.get(0, END)
index = bisect(list_of_items, item, ignore_case=self._ignore_case, ascending_order=self._ascending_order)
self._listbox.delete(index-1)
def selected_items(self):
list_of_items = []
for index in self._listbox.curselection():
list_of_items.append(self._listbox.get(index))
return list_of_items
def selected_item(self):
return self._listbox.curselection()[0]
def deselect_all(self):
self._listbox.selection_clear(0, END)
def select(self, item):
index = self.index(item)
if index is None:
return
self._listbox.selection_set(index)
def deselect(self, item):
index = self.index(item)
if index is None:
return
self._listbox.selection_clear(index)
def index(self, item):
list_of_items = self._listbox.get(0, END)
try:
index = list_of_items.index(item)
except ValueError:
return None
return index
def bind(self, event, handler):
self._listbox.bind(event, handler)
def clear(self):
self._listbox.delete(1,END)
def __iter__(self):
return self.items
@property
def items(self):
return self._listbox.get(0, END)
if __name__ == "__main__":
try:
from Tkinter import Tk, Label
except ImportError:
from tkinter import Tk, Label
root = Tk()
list_of_cities = ["New York", "London", "mADrid", "Tokyo", "caRaCas", "Ottawa", "PraGUE", "Cairo", "Moscow", "Quito", "LuxEMbourg", "Mexico City"]
for ascending_order in (True, False):
for ignore_case in (True, False):
Label(root, text="ascending_order= %s, ignore_case= %s"%(ascending_order, ignore_case)).pack()
ordered_listbox = Ordered_Listbox(root, data=list_of_cities, ascending_order=ascending_order, ignore_case=ignore_case)
ordered_listbox.pack(pady=(0,6))
ordered_listbox.add_item("Rome")
ordered_listbox.add_item("Paris")
ordered_listbox.select("Rome")
ordered_listbox.pack()
root.mainloop()
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