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