Numpad In Tkinter Python

I am trying to link a numpad to the entry field in my Python code, but i cant get it working. I hope someone can help me with this. Thanks in advance! My code import tkinter as tk

Solution 1:

This was a numpad example I wrote a few years ago for a Raspberry Pi touch screen application. It works (I could improve upon the code now though).

Click on an entry field to bring up the Numpad. To make it work in your code, replace your entry1 instance of tk.Entry with my NumpadEntry. Should be as simple as that. For example

entry1 = NumpadEntry(root)

EDIT: Slight change made to add the enumerate_row_column generator. Old way of doing it wasn't very pythonic.

from tkinter import *
from tkinter import simpledialog

def enumerate_row_column(iterable, num_cols):
    for idx, item in enumerate(iterable):
        row = idx // num_cols
        col = idx % num_cols
        yield row,col,item

class NumpadEntry(Entry):
    def __init__(self,parent=None,**kw):
        Entry.__init__(self,parent,**kw)
        self.bind('<FocusIn>',self.numpadEntry)
        self.bind('<FocusOut>',self.numpadExit)
        self.edited = False
    def numpadEntry(self,event):
        if self.edited == False:
            print("You Clicked on me")
            self['bg']= '#ffffcc'
            self.edited = True
            new = numPad(self)
        else:
            self.edited = False
    def numpadExit(self,event):
        self['bg']= '#ffffff'

class numPad(simpledialog.Dialog):
    def __init__(self,master=None,textVariable=None):
        self.top = Toplevel(master=master)
        self.top.protocol("WM_DELETE_WINDOW",self.ok)
        self.createWidgets()
        self.master = master
        
    def createWidgets(self):
        btn_list = ['7',  '8',  '9', '4',  '5',  '6', '1',  '2',  '3', '0',  'Close',  'Del']
        # create and position all buttons with a for-loop
        btn = []
        # Use custom generator to give us row/column positions
        for r,c,label in enumerate_row_column(btn_list,3):
            # partial takes care of function and argument
            cmd = lambda x = label: self.click(x)
            # create the button
            cur = Button(self.top, text=label, width=10, height=5, command=cmd)
            # position the button
            cur.grid(row=r, column=c)                                              
            btn.append(cur)
            
    def click(self,label):
        print(label)
        if label == 'Del':
            currentText = self.master.get()
            self.master.delete(0, END)
            self.master.insert(0, currentText[:-1])
        elif label == 'Close':
            self.ok()
        else:
            currentText = self.master.get()
            self.master.delete(0, END)
            self.master.insert(0, currentText+label)
    def ok(self):
        self.top.destroy()
        self.top.master.focus()

class App(Frame):
    def __init__(self,parent=None,**kw):
        Frame.__init__(self,parent,**kw)
        self.textEntryVar1 = StringVar()
        self.e1 = NumpadEntry(self,textvariable=self.textEntryVar1)
        self.e1.grid()

        self.textEntryVar2 = StringVar()
        self.e2 = NumpadEntry(self,textvariable=self.textEntryVar2)
        self.e2.grid()


if __name__ == '__main__':
    root = Tk()
    root.geometry("200x100")
    app = App(root)
    app.grid()
    root.mainloop()