Python tkinter con el calendario ttk

Estoy usando este código para crear un calendario simple en mi Tkinter. Cuando coloco un calendario en mi ventana raíz principal, el calendario se ve bien. Entonces, decidí poner otro botón que creará una ventana de nivel superior de Tkinter y pondré 1 calendario más en la ventana de nivel superior. Pero esta vez no se pudo mostrar el calendario y en su lugar me dio este error, " TclError: can't pack .18913120 inside .18912200.18912400" . ¿Alguien podría explicar por qué recibo este mensaje de error?

Este es mi código de ejemplo:

 import calendar import sys try: import Tkinter import tkFont except ImportError: # py3k import tkinter as Tkinter import tkinter.font as tkFont 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('', 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) # 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 = tkFont.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 = tkFont.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('', lambda evt: canvas.place_forget()) self._calendar.bind('', lambda evt: canvas.place_forget()) self._calendar.bind('', 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 myfunction(): root2=Tkinter.Toplevel(root) ttkcal = Calendar(root2,firstweekday=calendar.SUNDAY) ttkcal.pack(expand=1, fill='both') root=Tkinter.Tk() frame=Tkinter.Frame(root) frame.pack(side="left") button=Tkinter.Button(root,text="Top level",command=myfunction) button.pack(side="right") ttkcal = Calendar(frame,firstweekday=calendar.SUNDAY) ttkcal.pack(expand=1, fill='both') root.mainloop() 

El autor de este widget usó una acción innecesaria: este widget configuró el tamaño mínimo de la ventana raíz y asumió que es la única ventana en un progtwig (no es un error, es una característica).

1. En el método def __place_widgets(self) :

 self._calendar = ttk.Treeview(show='', selectmode='none', height=7) 

debiera ser:

 self._calendar = ttk.Treeview(self, show='', selectmode='none', height=7) 

2.En constructor quitar linea:

 self._calendar.bind('', self.__minsize) 

3. Eliminar __minsize método
4.Si desea establecer un tamaño mínimo para root2 use este código:

 def myfunction(): root2=Tkinter.Toplevel(root) ttkcal = Calendar(root2,firstweekday=calendar.SUNDAY) ttkcal.pack(expand=1, fill='both') root2.update() root2.minsize(root2.winfo_reqwidth(), root2.winfo_reqheight())