Behaviour of DateEntry in Tkinter Window

Question

I have a button that adds a DateEntry widget to a scrollable frame. Unfortunately, the frame is at the bottom of the window, so after adding a few rows, the dropdown calendar hides behind the task bar. Is there any way to change it, so the calendar opens above the field, rather than below?

Here is some test code

from tkinter import *
from tkinter import ttk
from tkcalendar import Calendar, DateEntry

master = Tk()

global rowNumForShiftReport
rowNumForShiftReport=0
shiftDateWidgetList=[]

def myfunction(event):
    canvas2.configure(scrollregion=canvas2.bbox("all"), width=100, height=100)

def addEntry2():
    global rowNumForShiftReport


    rowNumForShiftReport = rowNumForShiftReport + 1
    shiftDateWidgetList.append(DateEntry(frame2, state='readonly', width=15))
    shiftDateWidgetList[-1].grid(row=rowNumForShiftReport, column=0)
    rowNumForShiftReport+1


master.geometry('400x400')
btn_addField2 = ttk.Button(master, text="Add Entry",command=addEntry2)
btn_addField2.grid(row=0, column=1)
#lotFrame2 = Frame(master)
actualLabelFrame=ttk.LabelFrame(master, text="Shift Report", height=300, width=300)
actualLabelFrame.grid(row=0, column=0)
canvas2 = Canvas(actualLabelFrame,width=160)
frame2 = Frame(canvas2,width=160)
frame2.bind("<Configure>", myfunction)
canvas2.create_window((0, 0), window=frame2, anchor='nw')
scrollBar2 = ttk.Scrollbar(actualLabelFrame, orient="vertical", command=canvas2.yview)
canvas2.configure(yscrollcommand=scrollBar2.set)
scrollBar2.grid(row=0, column=2, sticky=N + S)
canvas2.grid(row=0, column=1)



mainloop()

I think you need to patch `DateEntry` to achieve what you need. — acw1668, Oct 24 '20 at 03:11

score 3 · Accepted Answer · answered Oct 24 '20 at 04:35

You can achieve the goal by extending DateEntry and override its drop_down() function as below:

class MyDateEntry(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()
            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)
            # - patch begin: make sure the drop-down calendar is visible
            if x+self._top_cal.winfo_width() > self.winfo_screenwidth():
                x = self.winfo_screenwidth() - self._top_cal.winfo_width()
            if y+self._top_cal.winfo_height() > self.winfo_screenheight()-30:
                y = self.winfo_rooty() - self._top_cal.winfo_height()
            # - patch end
            self._top_cal.geometry('+%i+%i' % (x, y))
            self._top_cal.deiconify()
            self._calendar.focus_set()
            self._calendar.selection_set(date)

Then replace all DateEntry(...) by MyDateEntry(...) in your code.

Note that it is based on tkcalendar v1.6.1.

Is there some documentation or tutorials on positioning of the windows? I always found it hard to understand the correct positioning while making custom widget classes. — Delrius Euphoria, Oct 24 '20 at 06:06

Behaviour of DateEntry in Tkinter Window

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