How to update frame using tkinter?

Question

I have created two frames using tkinter. In the first frame named StarterPage there is a button that execute the function:

estrazioneCanzoni(sp, codice_playlist_piaciute, codice_playlist_non_piaciute)

where there is this declaration:

global scoreDecisionTree, scoreKnn, scoreRandomForest, scoreKmeans

and where I evaluate the previous variables with some values. I have checked that the evaluation of the global variables works printing them using the console.

The button also open the PageOne frame. The problem is that PageOne frame shows as value for scoreDecisionTree, scoreKnn, scoreRandomForest and scoreKmeans: None, instead of the actual values that I can see when I print them in the console, not using the tkinter gui. I think the problem is that PageOne frame is created at the beginning and never updated. How can I solve it?

scoreDecisionTree=None
scoreKnn=None
scoreRandomForest=None
scoreKmeans=None

class SampleApp(tk.Tk):

    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)

        self.title_font = tkfont.Font(family='Helvetica', size=18, weight="bold", slant="italic")

        container = tk.Frame(self)
        container.pack(side="top", fill="both", expand=True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        self.frames = {}
        self.frames["StartPage"] = StartPage(parent=container, controller=self)
        self.frames["PageOne"] = PageOne(parent=container, controller=self)


        self.frames["StartPage"].grid(row=0, column=0, sticky="nsew")
        self.frames["PageOne"].grid(row=0, column=0, sticky="nsew")


        self.show_frame("StartPage")

    def show_frame(self, page_name):
        '''Show a frame for the given page name'''
        frame = self.frames[page_name]
        frame.tkraise()


class StartPage(tk.Frame):

    def __init__(self, parent, controller):
        sp=login()
        tk.Frame.__init__(self, parent)
        self.controller = controller
        label = tk.Label(self, text="ID playlist canzoni piaciute", font = "Times 15")
        label.pack(side="top", fill="x", pady=10)

        self.entry1 = tk.Entry(self, width=30)
        self.entry1.pack(side="top", fill="x", pady=10)

        label = tk.Label(self, text="ID playlist canzoni non piaciute",font = "Times 15")
        label.pack(side="top", fill="x", pady=10)

        self.entry2 = tk.Entry(self, width=30)
        self.entry2.pack(side="top", fill="x", pady=10)

        def parametri():
            estrazioneCanzoni(sp, self.entry1.get(), self.entry2.get())
            controller.show_frame("PageOne")

        button1 = tk.Button(self, text="Analizza",
                            command= lambda: parametri())

        button1.pack()


class PageOne(tk.Frame):

    def __init__(self, parent, controller):

        tk.Frame.__init__(self, parent)
        self.controller = controller
        label = tk.Label(self, text="Accuratezza", font=controller.title_font)
        label.pack(side="top", fill="x", pady=10)
        label1 = tk.Label(self, font="Times 12" )
        label1.pack(side="top", fill="x", pady=10)
        label1.config(text = "Decision tree: {}".format(scoreDecisionTree))
        label2 = tk.Label(self, font="Times 12" )
        label2.pack(side="top", fill="x", pady=10)
        label2.config(text = "Knn: {}".format(scoreKnn))
        label3 = tk.Label(self, font="Times 12" )
        label3.pack(side="top", fill="x", pady=10)
        label3.config(text = "Random forest: {}".format(scoreRandomForest))
        label4 = tk.Label(self, font="Times 12" )
        label4.pack(side="top", fill="x", pady=10)
        label4.config(text = "Kmeans: {}".format(scoreKmeans))


if __name__ == "__main__":
    app = SampleApp()
    app.mainloop()

unutbu · Accepted Answer · 2019-01-07 03:39:31Z

Move the PageOne label.config calls into a PageOne.update_globals method:

def update_globals(self):
    self.label1.config(text="Decision tree: {}".format(scoreDecisionTree))
    self.label2.config(text="Knn: {}".format(scoreKnn))
    self.label3.config(text="Random forest: {}".format(scoreRandomForest))
    self.label4.config(text="Kmeans: {}".format(scoreKmeans))

and make a StartApp.update_globals method which sends method calls to all the frames that need updating when globals change:

def update_globals(self):
    frame = self.frames["PageOne"]
    frame.update_globals()

Then have StartPage call controller.update_globals() inside parametri:

def parametri():
    estrazioneCanzoni(sp, self.entry1.get(), self.entry2.get())
    controller.update_globals()
    controller.show_frame("PageOne")

Thus, whenever the Analizza button is pressed, estrazioneCanzoni changes the globals, and controller.update_globals() handles the setting of the labels in PageOne.

import tkinter as tk
from tkinter import font as tkfont

scoreDecisionTree = None
scoreKnn = None
scoreRandomForest = None
scoreKmeans = None


class SampleApp(tk.Tk):

    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)

        self.title_font = tkfont.Font(
            family='Helvetica', size=18, weight="bold", slant="italic")

        container = tk.Frame(self)
        container.pack(side="top", fill="both", expand=True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        self.frames = {}
        self.frames["StartPage"] = StartPage(parent=container, controller=self)
        self.frames["PageOne"] = PageOne(parent=container, controller=self)

        self.frames["StartPage"].grid(row=0, column=0, sticky="nsew")
        self.frames["PageOne"].grid(row=0, column=0, sticky="nsew")

        self.show_frame("StartPage")

    def show_frame(self, page_name):
        '''Show a frame for the given page name'''
        frame = self.frames[page_name]
        frame.tkraise()

    def update_globals(self):
        frame = self.frames["PageOne"]
        frame.update_globals()

class StartPage(tk.Frame):

    def __init__(self, parent, controller):
        sp = login()
        tk.Frame.__init__(self, parent)
        self.controller = controller
        label = tk.Label(
            self, text="ID playlist canzoni piaciute", font="Times 15")
        label.pack(side="top", fill="x", pady=10)

        self.entry1 = tk.Entry(self, width=30)
        self.entry1.pack(side="top", fill="x", pady=10)

        label = tk.Label(
            self, text="ID playlist canzoni non piaciute", font="Times 15")
        label.pack(side="top", fill="x", pady=10)

        self.entry2 = tk.Entry(self, width=30)
        self.entry2.pack(side="top", fill="x", pady=10)

        def parametri():
            estrazioneCanzoni(sp, self.entry1.get(), self.entry2.get())
            controller.update_globals()
            controller.show_frame("PageOne")

        button1 = tk.Button(self, text="Analizza", command=lambda: parametri())

        button1.pack()


class PageOne(tk.Frame):

    def __init__(self, parent, controller):

        tk.Frame.__init__(self, parent)
        self.controller = controller

        label = tk.Label(self, text="Accuratezza", font=controller.title_font)
        label.pack(side="top", fill="x", pady=10)
        self.label1 = tk.Label(self, font="Times 12")
        self.label1.pack(side="top", fill="x", pady=10)
        self.label2 = tk.Label(self, font="Times 12")
        self.label2.pack(side="top", fill="x", pady=10)
        self.label3 = tk.Label(self, font="Times 12")
        self.label3.pack(side="top", fill="x", pady=10)
        self.label4 = tk.Label(self, font="Times 12")
        self.label4.pack(side="top", fill="x", pady=10)

    def update_globals(self):
        self.label1.config(text="Decision tree: {}".format(scoreDecisionTree))
        self.label2.config(text="Knn: {}".format(scoreKnn))
        self.label3.config(text="Random forest: {}".format(scoreRandomForest))
        self.label4.config(text="Kmeans: {}".format(scoreKmeans))

def login():
    # just a simple example to allow the program to run
    return 10


def estrazioneCanzoni(sp, a, b):
    # just a simple example to allow the program to run
    global scoreDecisionTree, scoreKnn, scoreRandomForest, scoreKmeans
    scoreDecisionTree, scoreKnn, scoreRandomForest, scoreKmeans = sp, a, b, a+b


if __name__ == "__main__":
    app = SampleApp()
    app.mainloop()

Collectives™ on Stack Overflow

How to update frame using tkinter?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related