Reputation: 13
I have created a GUI where the user can select a date from a drop down using the tkcalendar DateEntry widget. I would like to allow the user the option of not selecting a date and leaving this widget blank. However, even if no date is selected the widget returns the current date.
Is there a way to configure the DateEntry to allow for no selection rather than defaulting to the current date if the user does not select a date?
Below is a subset of my code:
import pandas as pd
from tkinter import *
from tkinter.ttk import *
import tkinter as tk
from tkcalendar import DateEntry
class Window(Frame):
def __init__(self, master):
Frame.__init__(self,master)
master.title('Solar Master Project Tracking')
# create canvas for scrollable window
canvas = Canvas(root)
canvas.grid(row=1,column=0, columnspan=2)
# create vertical scrollbar and connect it to the canvas
scrollBar = tk.Scrollbar(root, orient='vertical', command = canvas.yview)
scrollBar.grid(row=1, column=2, sticky = 'ns')
canvas.configure(yscrollcommand=scrollBar.set)
def update_scroll_region(event):
canvas.configure(scrollregion=canvas.bbox("all"))
def _on_mousewheel(event):
canvas.yview_scroll(int(-1*(event.delta/120)), "units")
# create a frame for the widgets in the scrollable canvas
scroll_frame = Frame(canvas)
scroll_frame.bind("<Configure>", update_scroll_region)
canvas.create_window(0,0, anchor='nw', window = scroll_frame)
canvas.bind_all("<MouseWheel>", _on_mousewheel)
# Proposal Date
self.L18 = Label(scroll_frame, text="Proposal Date:",font=('TKDefaultFont', 8, 'bold'))
self.L18.grid(row=21, column=0, sticky=W)
self.prop_date_selection = DateEntry(scroll_frame, width = 25, background = 'LightCyan3',
foreground ='white',borderwidth=2)
self.prop_date_selection.grid(row=21, column=1,sticky=E)
self.prop_date_selection.delete(0,"end")
# SUBMIT INFORMATION
self.button = tk.Button(root, text="Insert / Update Project",font=('TKDefaultFont', 10, 'bold'),
relief=RAISED, command = self.store_user_inputs, bg = "gray80")
self.button.grid(row=25, column = 0, columnspan=8, sticky = 'EW')
# STORE USER INPUT
def store_user_inputs(self):
prop_date_selection = self.prop_date_selection.get_date()
global params
params = [prop_date_selection]
root.destroy()
if __name__ == "__main__":
root = Tk()
Window(root)
root.mainloop()
Upvotes: 1
Views: 1537
Reputation: 11
I was facing the same issue, and I resolved by modifying _validate_date() and drop_down() function
I first try to _set_text the input to empty string
tk.Label(parent, text="Time Range (Start):").grid(row=4, column=0, sticky='w')
self.start_time = MyDateEntry(parent, width=12, background='darkblue', foreground='white', borderwidth=2)
self.start_time._set_text('')
Then I manage to create a simple date checking to allow drop down to be displayed
Here is MyDateEntry class looks like
class MyDateEntry(tkcalendar.DateEntry):
def drop_down(self):
"""Display or withdraw the drop-down calendar depending on its current state."""
if self._calendar.winfo_ismapped():
self._top_cal.withdraw()
else:
self._validate_date()
# CHANGES: Default to date today when drop down is selected
date = datetime.datetime.now().strftime("%m/%d/%Y")
if self.get() != '':
date = self.parse_date(self.get())
x = self.winfo_rootx()
y = self.winfo_rooty() + self.winfo_height()
if self.winfo_toplevel().attributes('-topmost'):
self._top_cal.attributes('-topmost', True)
else:
self._top_cal.attributes('-topmost', False)
self._top_cal.geometry('+%i+%i' % (x, y))
self._top_cal.deiconify()
self._calendar.focus_set()
self._calendar.selection_set(date)
def _validate_date(self):
if self.get() == '':
return True # Modified from Roman's Answer
return super()._validate_date()
It was encountering error on drop down when the validated empty date was selected
Upvotes: 1
Reputation: 35
For those who find this post.
Modifying get_date() didn't change anything in my case. But the following did:
class MyDateEntry(tkcalendar.DateEntry):
def _validate_date(self):
if not self.get():
return True # IMPORTANT!!! Validation must return True/False otherwise it is turned off by tkinter engine
return super()._validate_date()
Upvotes: 0
Reputation: 16179
You can create a class inheriting from tkcalendar.DateEntry
and modify the get_date()
method to return None
when the DateEntry is empty:
import tkcalendar
class DateEntry(tkcalendar.DateEntry):
def get_date(self):
if not self.get():
return None
self._validate_date()
return self.parse_date(self.get())
Upvotes: 0