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+--- Thread: [Tkinter] Help running a loop inside a tkinter frame (/thread-40508.html)
Help running a loop inside a tkinter frame - Konstantin23 - Aug-08-2023
I have this password manager gui app made in tkinter, which consists of a frame stack corresponding to their respective frame classes to switch between frames. Each time a frame is switched, there is a certain set of variables which get passed around the frames.
page_name and username are strings whereas services and data are lists. Now status is a bool variable who's default value is False, but while switching to the current frame, its value is modified to True. Now is there a way I can implement an endless loop which keeps running while the app runs, just to check if status is True, in which case, the option menu's values get updated. or is there a method I can implement which gets called when the current frame is raised inside the window or any other way in which the program can constantly check for status value?import tkinter as tk
from customtkinter import CTkTextbox, CTkOptionMenu
class retrieve(tk.Frame):
def __init__(self, parent, controller):
self.controller = controller
tk.Frame.__init__(self, parent, bg="black", highlightthickness=5, highlightcolor='white')
self.controller = controller
head = tk.Label(self, bg="black", fg="white", text="STORED DATA",
font=("Terminal", 32))
data_disp = CTkTextbox(self, fg_color="black", text_color="white", font=("Terminal", 22, "bold"),
scrollbar_button_color="white", scrollbar_button_hover_color="white",wrap=tk.WORD,
corner_radius=0, width=450, height=250, border_width=0)
option = tk.StringVar()
def dropdown_callback(choice):
services = self.controller.services
#abc = ["A", "b", "abc"]
data = self.controller.data
i = services.index(choice)
result = str(data[i])
data_disp.configure(state=tk.NORMAL)
data_disp.delete("0.0", tk.END)
data_disp.insert("0.0", result)
data_disp.configure(state=tk.DISABLED)
print("dropdown clicked:", choice)
# UPDATING THE WINDOW STATUS
status = self.controller.status
if status:
services = self.controller.services
self.service_list.configure(values=services)
print("values updated")
# ============================
self.service_list = CTkOptionMenu(self, fg_color="black", text_color="white", font=("Terminal", 20, "bold"),
corner_radius=0, width=450, height=36, variable=option,
command=dropdown_callback, dropdown_fg_color="black",
dropdown_text_color="white", dropdown_font=("Terminal", 20, "bold"),hover=False,
button_color="black", button_hover_color="white", dropdown_hover_color="black")
self.service_list.set(">SERVICE NAME")
back = tk.Button(self,
bg="black", fg="white",
text='BACK', font=("Terminal", 18, "bold"),
command=lambda: controller.show_frame(page_name="menu", username=self.controller.username,
services=self.controller.services, data=self.controller.data, status=self.controller.status),
activebackground="black",
relief=tk.SOLID,
borderwidth=0,
padx=16, pady=0, cursor="hand2")
entNote = tk.Label(self,bg="black", fg="white", text="(enter)",
font=("Terminal", 10))
head.place(relx=0.5, rely=0.1, anchor=tk.CENTER)
self.service_list.place(relx=0.1, rely=0.3, y=-10,x=-35,anchor=tk.W)
data_disp.place(relx=0.1, rely=0.45, x=-30, y=65,anchor=tk.W)
back.place(relx=0.5, rely=0.9, anchor=tk.CENTER)
entNote.place(relx=0.5, rely=0.9, y=20, anchor=tk.CENTER)
controller.exitButton(self)
controller.homeButton(self)
def binds(self):
self.focus_set()
self.controller.bind('<Return>', lambda x: self.controller.show_frame(page_name="menu", username=self.controller.username,
services=self.controller.services, data=self.controller.data, status=self.controller.status))Also I tried implementing like so:while True:
status = self.controller.status
if status:
services = self.controller.services
self.service_list.configure(values=services)
print("values updated")
breakbut on running the app, it gets freezed and then crashes.PS: I tried tkinter binding methods too but looks like they dont work with the custom tkinter widgets I am using.
RE: Help running a loop inside a tkinter frame - Gribouillis - Aug-08-2023
(Aug-08-2023, 07:19 PM)Konstantin23 Wrote: Now is there a way I can implement an endless loop which keeps running while the app runs, just to check if status is True, in which case, the option menu's values get updated.How does the status change? Can't you just update the option menu's values when the program changes the status? It looks like an observer pattern. Or does the status change unpredictably?
RE: Help running a loop inside a tkinter frame - menator01 - Aug-08-2023
tkinter has it's own loop running. You could use after to update.
example of a simple clock
import tkinter as tk
from time import strftime
class Window:
def __init__(self, parent):
self.parent = parent
self.label = tk.Label(parent, text='')
self.label.pack(expand=True, fill='both')
self.update()
def update(self):
clock = strftime('%H:%M:%S')
self.label['text'] = clock
self.label['font'] = (None, 28, 'normal')
self.parent.after(1000, self.update)
if __name__ == '__main__':
root = tk.Tk()
root.geometry('300x200+200+200')
Window(root)
root.mainloop()
RE: Help running a loop inside a tkinter frame - Konstantin23 - Aug-10-2023
(Aug-08-2023, 07:39 PM)menator01 Wrote: tkinter has it's own loop running. You could use after to update.
example of a simple clock
import tkinter as tk from time import strftime class Window: def __init__(self, parent): self.parent = parent self.label = tk.Label(parent, text='') self.label.pack(expand=True, fill='both') self.update() def update(self): clock = strftime('%H:%M:%S') self.label['text'] = clock self.label['font'] = (None, 28, 'normal') self.parent.after(1000, self.update) if __name__ == '__main__': root = tk.Tk() root.geometry('300x200+200+200') Window(root) root.mainloop()
Thank you so much! this was exactly the kind of solution I was looking for, implementing a self updating function.