Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
"""
Simple calendar using ttk Treeview together with calendar and datetime
classes.
"""
import calendar
import tkinter
import tkinter.font
from tkinter import ttk
def get_calendar(locale, fwday):
# instantiate proper calendar class
if locale is None:
return calendar.TextCalendar(fwday)
else:
return calendar.LocaleTextCalendar(fwday, locale)
class Calendar(ttk.Frame):
# XXX ToDo: cget and configure
datetime = calendar.datetime.datetime
timedelta = calendar.datetime.timedelta
def __init__(self, master=None, **kw):
"""
WIDGET-SPECIFIC OPTIONS
locale, firstweekday, year, month, selectbackground,
selectforeground
"""
# remove custom options from kw before initializating ttk.Frame
fwday = kw.pop('firstweekday', calendar.MONDAY)
year = kw.pop('year', self.datetime.now().year)
month = kw.pop('month', self.datetime.now().month)
locale = kw.pop('locale', None)
sel_bg = kw.pop('selectbackground', '#ecffc4')
sel_fg = kw.pop('selectforeground', '#05640e')
self._date = self.datetime(year, month, 1)
self._selection = None # no date selected
ttk.Frame.__init__(self, master, **kw)
self._cal = get_calendar(locale, fwday)
self.__setup_styles() # creates custom styles
self.__place_widgets() # pack/grid used widgets
self.__config_calendar() # adjust calendar columns and setup tags
# configure a canvas, and proper bindings, for selecting dates
self.__setup_selection(sel_bg, sel_fg)
# store items ids, used for insertion later
self._items = [self._calendar.insert('', 'end', values='')
for _ in range(6)]
# insert dates in the currently empty calendar
self._build_calendar()
# set the minimal size for the widget
#self._calendar.bind('<Map>', self.__minsize)
def __setitem__(self, item, value):
if item in ('year', 'month'):
raise AttributeError("attribute '%s' is not writeable" % item)
elif item == 'selectbackground':
self._canvas['background'] = value
elif item == 'selectforeground':
self._canvas.itemconfigure(self._canvas.text, item=value)
else:
ttk.Frame.__setitem__(self, item, value)
def __getitem__(self, item):
if item in ('year', 'month'):
return getattr(self._date, item)
elif item == 'selectbackground':
return self._canvas['background']
elif item == 'selectforeground':
return self._canvas.itemcget(self._canvas.text, 'fill')
else:
r = ttk.tclobjs_to_py({item: ttk.Frame.__getitem__(self, item)})
return r[item]
def __setup_styles(self):
# custom ttk styles
style = ttk.Style(self.master)
arrow_layout = lambda dir: (
[('Button.focus', {'children': [('Button.%sarrow' % dir, None)]})]
)
style.layout('L.TButton', arrow_layout('left'))
style.layout('R.TButton', arrow_layout('right'))
def __place_widgets(self):
# header frame and its widgets
hframe = ttk.Frame(self)
lbtn = ttk.Button(hframe, style='L.TButton', command=self._prev_month)
rbtn = ttk.Button(hframe, style='R.TButton', command=self._next_month)
self._header = ttk.Label(hframe, width=15, anchor='center')
# the calendar
#self._calendar = ttk.Treeview(show='', selectmode='none', height=7)
self._calendar = ttk.Treeview(self, show='', selectmode='none', height=7)
# pack the widgets
hframe.pack(in_=self, side='top', pady=4, anchor='center')
lbtn.grid(in_=hframe)
self._header.grid(in_=hframe, column=1, row=0, padx=12)
rbtn.grid(in_=hframe, column=2, row=0)
self._calendar.pack(in_=self, expand=1, fill='both', side='bottom')
def __config_calendar(self):
cols = self._cal.formatweekheader(3).split()
self._calendar['columns'] = cols
self._calendar.tag_configure('header', background='grey90')
self._calendar.insert('', 'end', values=cols, tag='header')
# adjust its columns width
font = tkinter.font.Font()
maxwidth = max(font.measure(col) for col in cols)
for col in cols:
self._calendar.column(col, width=maxwidth, minwidth=maxwidth,
anchor='e')
def __setup_selection(self, sel_bg, sel_fg):
self._font = tkinter.font.Font()
self._canvas = canvas = tkinter.Canvas(self._calendar,
background=sel_bg, borderwidth=0, highlightthickness=0)
canvas.text = canvas.create_text(0, 0, fill=sel_fg, anchor='w')
canvas.bind('<ButtonPress-1>', lambda evt: canvas.place_forget())
self._calendar.bind('<Configure>', lambda evt: canvas.place_forget())
self._calendar.bind('<ButtonPress-1>', self._pressed)
#def __minsize(self, evt):
# width, height = self._calendar.master.geometry().split('x')
# height = height[:height.index('+')]
# self._calendar.master.minsize(width, height)
def _build_calendar(self):
year, month = self._date.year, self._date.month
# update header text (Month, YEAR)
header = self._cal.formatmonthname(year, month, 0)
self._header['text'] = header.title()
# update calendar shown dates
cal = self._cal.monthdayscalendar(year, month)
for indx, item in enumerate(self._items):
week = cal[indx] if indx < len(cal) else []
fmt_week = [('%02d' % day) if day else '' for day in week]
self._calendar.item(item, values=fmt_week)
def _show_selection(self, text, bbox):
"""Configure canvas for a new selection."""
x, y, width, height = bbox
textw = self._font.measure(text)
canvas = self._canvas
canvas.configure(width=width, height=height)
canvas.coords(canvas.text, width - textw, height / 2 - 1)
canvas.itemconfigure(canvas.text, text=text)
canvas.place(in_=self._calendar, x=x, y=y)
# Callbacks
def _pressed(self, evt):
"""Clicked somewhere in the calendar."""
x, y, widget = evt.x, evt.y, evt.widget
item = widget.identify_row(y)
column = widget.identify_column(x)
if not column or not item in self._items:
# clicked in the weekdays row or just outside the columns
return
item_values = widget.item(item)['values']
if not len(item_values): # row is empty for this month
return
text = item_values[int(column[1]) - 1]
if not text: # date is empty
return
bbox = widget.bbox(item, column)
if not bbox: # calendar not visible yet
return
# update and then show selection
text = '%02d' % text
self._selection = (text, item, column)
self._show_selection(text, bbox)
def _prev_month(self):
"""Updated calendar to show the previous month."""
self._canvas.place_forget()
self._date = self._date - self.timedelta(days=1)
self._date = self.datetime(self._date.year, self._date.month, 1)
self._build_calendar() # reconstuct calendar
def _next_month(self):
"""Update calendar to show the next month."""
self._canvas.place_forget()
year, month = self._date.year, self._date.month
self._date = self._date + self.timedelta(
days=calendar.monthrange(year, month)[1] + 1)
self._date = self.datetime(self._date.year, self._date.month, 1)
self._build_calendar() # reconstruct calendar
# Properties
@property
def selection(self):
"""Return a datetime representing the current selected date."""
if not self._selection:
return None
year, month = self._date.year, self._date.month
return self.datetime(year, month, int(self._selection[0]))
def test():
import sys
root = tkinter.Tk()
root.title('Ttk Calendar')
ttkcal = Calendar(firstweekday=calendar.SUNDAY)
ttkcal.pack(expand=1, fill='both')
if 'win' not in sys.platform:
style = ttk.Style()
style.theme_use('clam')
root.mainloop()
if __name__ == '__main__':
test()
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.