Hello. I am trying to build a tkinter GUI using mainloop. I have initially not used mainloop and managed to build and interface just by updating the tk.window when required. However, I would like to understand how to properly use the mainloop and build the interface with it.
I am using Raspberry PI python as a programming environment.
This is my main function that is being called:
As you can see. At the end of login i use mainloop. Inside this login function, I am using bind function to bind enter key to execute function login_verify().
When I enter the login details and press enter, the login_verify will be executed:
If the password matches the expected password, I then call the function Full_operation:
window.after(1000,Full_operation)
which is supposed to handle all the tasks that I need
Full operation code:
Inside full operation code, I want to replace login GUI with my application gui therefore I call application_GUI function:
Here I delete the previous canvas and create a new widgets for my application. I can see that the code executes and then gets stuck in my while loop:
entry_code.bind('<Return>',get_callback)
while (cont != 1):
time.sleep(0.1)
print("waiting")
I am stuck on this while loop untill I press enter key.
The problem is that no widgets are displayed after deleting the login canvas despite executing all the widget code in Application_GUI.
Thats how my GUI looks like after the login. It is supposed to destroy all previous widgets and create my application window:
You can see that it does not even delete the previous canvas properly as the text "Please enter details below to login" is still there
Any help is appreciated!
I am using Raspberry PI python as a programming environment.
This is my main function that is being called:
Code:
def login():
global window
global canvas_tk
global username_verify
global password_verify
global username_login_entry
global password_login_entry
window = tk.Tk() # create a GUI window
window.geometry("1920x1080") # set the configuration of GUI window
canvas_tk = tk.Canvas(window,bg='ivory2',width=1920,height=1080)
#canvas_tk.resizable(0,0)
window.title("Pick To Light")
canvas_tk.pack()
username_verify = tk.StringVar()
password_verify = tk.StringVar()
username_label = tk.Label(canvas_tk, text="Username * ")
username_login_entry = tk.Entry(canvas_tk, textvariable=username_verify)
username_login_entry.focus_set()
password_label = tk.Label(canvas_tk, text="Password * ")
password_login_entry = tk.Entry(canvas_tk, textvariable=password_verify, show= '*')
canvas_tk.create_text(960,20,text="Please enter details below to login")
canvas_tk.create_window(960,75,window=username_label)
canvas_tk.create_window(960,100,window=username_login_entry)
canvas_tk.create_window(960,125,window=password_label)
canvas_tk.create_window(960,150,window=password_login_entry)
username_login_entry.bind('<Return>',(lambda event: login_verify()))
password_login_entry.bind('<Return>',(lambda event: login_verify()))
window.mainloop() # start the GUIWhen I enter the login details and press enter, the login_verify will be executed:
Code:
ef login_verify():
#get username and password
username1 = username_verify.get()
password1 = password_verify.get()
# this will delete the entry after login button is pressed
username_login_entry.delete(0, tk.END)
password_login_entry.delete(0, tk.END)
#The method listdir() returns a list containing the names of the entries in the directory given by path.
list_of_files = os.listdir("/home/pi/Desktop/lukas_programming/PTL_python")
#defining verification's conditions
if username1 in list_of_files:
file1 = open(username1, "r") # open the file in read mode
verify = file1.read().splitlines()
if password1 in verify:
window.after(1000,Full_operation)
#login_sucess()
else:
password_not_recognised()
else:
user_not_found()window.after(1000,Full_operation)
which is supposed to handle all the tasks that I need
Full operation code:
Code:
def Full_operation():
print("starting full operation")
Application_GUI()
operacijos_kodas=Scanning_operation(myConnection,Scanned_serial)
print("CODE=",operacijos_kodas)
if(operacijos_kodas == 0):
update_canvas_label2(scan_label,960,75,"Press button")
pildymo_operacija(myConnection,Scanned_serial)
elif(operacijos_kodas == 1):
picking_gui()
#insertData_komplektacija(myConnection,"fmb110bbv801.csv");
gaminio_kodas = komplektacijos_ID+".csv"
insertData_komplektacija(myConnection,gaminio_kodas);
update_current_operation(myConnection);
update_canvas_label2(scan_label,960,75,"take")
gaminio_kodas_text = "Gaminio kodas="+Scanned_serial
gaminio_serial_text = "Serial="+komplektacijos_Serial
gaminio_IMEI_Text = "IMEI="+komplektacijos_Imei
canvas_tk.create_text(960,400,text=gaminio_kodas_text,font='Helvetica 12 bold')
canvas_tk.create_text(960,425,text=gaminio_serial_text,font='Helvetica 12 bold')
canvas_tk.create_text(960,450,text=gaminio_IMEI_Text,font='Helvetica 12 bold')
picking_operation(myConnection);
elif(operacijos_kodas == 2):
update_canvas_label2(scan_label,960,75,"invalid code")
#sss
#canvas_tk.update()
time.sleep(1)
window.after(1000,Full_operation())
Code:
def Application_GUI():
global Scanned_serial
global scan_label
global scan_entry
global cont
global entry_code
cont = 0
canvas_tk.delete("all")
start_label = tk.Label(canvas_tk,text = "scan code:",font='Helvetica 16 bold',bg='ivory2',foreground="red")
entry_code = tk.Entry(canvas_tk) # entry = guid
entry_code.focus_set()
end_program_button = tk.Button(canvas_tk, text="Baigti",font='Helvetica 12 bold', width=20, height=2, command=end_program)
ota_button = tk.Button(canvas_tk, text="Atnaujinti",font='Helvetica 12 bold', width=20, height=2, command=OTA_gui)
remove_item_button = tk.Button(canvas_tk, text="Isvalyti dezute",font='Helvetica 12 bold', width=20, height=2, command=Remove_item_gui)
new_operation_button = tk.Button(canvas_tk, text="Nauja operacija",font='Helvetica 12 bold', width=20, height=2, command = lambda:New_operation())
canvas_tk.create_text(960,20,text="PICK TO LIGHT",font='Helvetica 16 bold')
scan_label = canvas_tk.create_window(960,75,window=start_label)
scan_entry=canvas_tk.create_window(960,125,window=entry_code)
canvas_tk.create_window(1210,200,window=ota_button)
canvas_tk.create_window(960,200,window=remove_item_button)
canvas_tk.create_window(710,200,window = new_operation_button)
canvas_tk.create_window(1210,400,window = end_program_button)
#sss
#canvas_tk.update()
entry_code.bind('<Return>',get_callback)
while (cont != 1):
time.sleep(0.1)
print("waiting")
#sss
#canvas_tk.update()
cont = 0
Scanned_serial = entry_code.get()
print("SCanned serial = ",Scanned_serial)entry_code.bind('<Return>',get_callback)
while (cont != 1):
time.sleep(0.1)
print("waiting")
I am stuck on this while loop untill I press enter key.
The problem is that no widgets are displayed after deleting the login canvas despite executing all the widget code in Application_GUI.
Thats how my GUI looks like after the login. It is supposed to destroy all previous widgets and create my application window:
You can see that it does not even delete the previous canvas properly as the text "Please enter details below to login" is still there
Any help is appreciated!
Last edited:
