I am new to Python and not very experienced with classes, however working on the creation of a tkinter GUI for data processing right now.
As many time consuming processes are happening in the background not visible for the user, I would like to insert a progress-bar that shows the current progress between 0 and 100 as Progress and the processing step Action in the main window
Right now, I have problems to access the bar parameters (value and label/name) outside of the class when the code is doing the data processing in a different function.
Below is a working example of the GUI in Python 3.7
import time
import tkinter as tk
from tkinter import ttk
def ProcessingScript():
### UpdateProgressbar(50, 'Halfway there') ###
time.sleep(2)
print('Processing takes place here')
### UpdateProgressbar(75, 'Finishing up') ###
time.sleep(2)
class SampleApp(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
container = tk.Frame(self, width=500, height=500)
container.pack(side="top", fill="both", expand=True)
container.grid_rowconfigure(0, weight=1)
container.grid_columnconfigure(0, weight=1)
self.geometry("500x500")
self.frames = {}
frame = ProcessingPage(container, self)
self.frames[ProcessingPage] = frame
frame.grid(row=0, column=0, sticky="nsew")
self.show_frame(ProcessingPage)
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise()
class ProcessingPage(tk.Frame):
def __init__(self, parent, controller, ):
tk.Frame.__init__(self, parent)
self.controller = controller
def PlotData():
UpdateProgressbar(10, 'Generating...')
# Execute Main Plotting Function here
ProcessingScript()
UpdateProgressbar(100, 'Finished Plot')
def UpdateProgressbar(Progress, Action):
progressLabel = tk.Label(self, text=Action).place(x=20, y=440)
progressBar['value'] = Progress
progressBar = ttk.Progressbar(self, orient="horizontal", length=200,mode="determinate")
progressBar.place(x=20, y=470)
progressBar['value'] = 0
progressLabel = tk.Label(self, text='Idle...').place(x=20, y=440)
PlotButton = tk.Button(self, text='Plot Data',command= PlotData)
PlotButton.place(x=20, y=320)
if __name__ == "__main__":
app = SampleApp()
app.mainloop()
In this example, the ProcessingScript function would be in a different file and as an ideal outcome I would like to be able to call the UpdateProgressbar function from anywhere in my other scripts to update the bar.
Note: I am aware that a function inside the __init__ function is not best practice, however I was not able to get it running in any other way as I found no way to connect the results of the UpdateProgressbar function with the progressBar created.
Any help to achieve this and exclude UpdateProgressbar from __init__ is much appreciated.
EDIT:
Below is a working version based on the input from the comments. It might now be very pretty but is currently doing what I expect it do to. Please let me know if you see some possibilities for improvement.
app.update() has to be called after each change in the progress bar to show the error and old labels are deleted with self.progressLabel.destroy().
timeit.sleep() is simply a way of showing the changes and will not be part of the final code.
import time
import tkinter as tk
from tkinter import ttk
def ProcessingScript(self, callback):
ProcessingPage.UpdateProgressbar(self, 50, 'Halfway there')
time.sleep(2)
print('Processing takes place here')
ProcessingPage.UpdateProgressbar(self, 75, 'Finishing up')
time.sleep(2)
class SampleApp(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
container = tk.Frame(self, width=500, height=500)
container.pack(side="top", fill="both", expand=True)
container.grid_rowconfigure(0, weight=1)
container.grid_columnconfigure(0, weight=1)
self.geometry("500x500")
self.frames = {}
frame = ProcessingPage(container, self)
self.frames[ProcessingPage] = frame
frame.grid(row=0, column=0, sticky="nsew")
self.show_frame(ProcessingPage)
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise()
class ProcessingPage(tk.Frame):
def __init__(self, parent, controller, ):
tk.Frame.__init__(self, parent)
self.controller = controller
progressBar = ttk.Progressbar(self, orient="horizontal", length=200,mode="determinate")
progressBar.place(x=20, y=470)
progressBar['value'] = 0
self.progressLabel = tk.Label(self, text='Idle...')
self.progressLabel.place(x=20, y=440)
PlotButton = tk.Button(self, text='Plot Data',command= self.PlotData)
PlotButton.place(x=20, y=320)
def PlotData(self):
self.UpdateProgressbar(10, 'Generating...')
app.update()
time.sleep(2)
# Execute Main Plotting Function here
ProcessingScript(self, self.UpdateProgressbar)
self.UpdateProgressbar(100, 'Finished Plot')
app.update()
def UpdateProgressbar(self, Progress, Action):
self.progressLabel.destroy()
self.progressLabel = tk.Label(self, text=Action)
self.progressLabel.place(x=20, y=440)
progressBar = ttk.Progressbar(self, orient="horizontal", length=200,mode="determinate")
progressBar.place(x=20, y=470)
progressBar['value'] = Progress
app.update()
if __name__ == "__main__":
app = SampleApp()
app.mainloop()
