undo and validate_edit callback

Hi, For each cell edition I need to process an external action, the validate_edit callback is working fine for it for most edition (perfect :-) ). Now I try to manage the "undo" it seems that the validate_edit is not use. I tried the documented command:

self.sheet.edit_validation(self.validate_edits).bind("<<SheetModified>>", self.sheet_modified)

during undo the self.sheet_modified is well call but I have no indication of the cells modified with the new values (only old values)

I tried as well extra_binding end_undo but this is the same event as self.sheet_modified

Is there a way to manage each cell undo such validate_edit, with the cell row,col and new value of the cell ? Thank you

Here below the simple code I use to display event. 1 - I modify a cell 2 - Ctr-z to make the undo

from tksheet import Sheet
import tkinter as tk
import pprint

class demo(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.grid_columnconfigure(0, weight=1)
        self.grid_rowconfigure(0, weight=1)
        self.frame = tk.Frame(self)
        self.frame.grid_columnconfigure(0, weight=1)
        self.frame.grid_rowconfigure(0, weight=1)

        self.sheet = Sheet(
            self.frame,
            data=[[f"Row {r}, Column {c}" for c in range(6)] for r in range(21)],
            column_width=180,
            height=700,
            width=1100,
        )
        self.sheet.enable_bindings(
            "edit_cell",
            "copy",
            "paste",
            "cut",
            "undo",
            "delete",
            "rc_insert_row",
            "rc_delete_row",
            "rc_select",
            "arrowkeys",
            "column_width_resize",
            "row_select",
            "single_select",
        )

        for row in range(self.sheet.get_total_rows()):
            self.sheet.create_checkbox(
                r=row,
                c=1,
                checked=False,
                check_function=lambda event=None: self.click_checkbox(event),
            )

        self.frame.grid(row=0, column=0, sticky="nswe")
        self.sheet.grid(row=0, column=0, sticky="nswe")

        self.sheet.edit_validation(self.validate_edits).bind("<<SheetModified>>", self.sheet_modified)
        self.sheet.extra_bindings("end_undo", self.end_undo)

    def click_checkbox(self, event):
        """Custom checkbox"""
        print(f"[click_checkbox] eventname={event.eventname} row={event.row} col={event.column} value={event.value}")

    def end_undo(self, event):
        print(f"[end_undo] event=")
        pprint.pp(event)

    def validate_edits(self, event):
        print(f"[validate_edits] event=")
        pprint.pp(event)
        return event.value

    def sheet_modified(self, event):
        print(f"[sheet_modified] event=")
        pprint.pp(event)

app = demo()
app.mainloop()

ragardner / tksheet

undo and validate_edit callback #256