Tkinter combobox not working when focus_force is called - python

Am trying to select item in my combobox but it does not work after i call focus_force() on the toplevel window other widget in the window works but the combobox selection is not working.
When i remove focus_force() from my code it works alright but want to keep it for main code.
#!python3
import tkinter as tk
import tkinter.ttk as ttk
def toplevel_window():
global top, cb
top = tk.Toplevel(root)
top.title("TOP")
top.geometry("300x300")
cb = ttk.Combobox(top, values=["djdjd", "fjfjf"])
cb.pack()
BT = tk.Button(top, text="print", command=combo_select)
BT.pack(side=tk.BOTTOM)
top.bind("<FocusOut>", focusout_func)
top.bind("<<ComboboxSelected>>", combo_select)
def focusout_func(event):
print(cb.get())
top.focus_force()
top.bell()
def combo_select(event=None):
print(cb.get())
root = tk.Tk()
root.geometry("600x600")
root.title("root")
b = tk.Button(text="OPEN TOPLEVEL", command=toplevel_window)
b.pack()
root.mainloop()

The reason the Combobox selection is not working is because you're causing the funcion focusout_func() to be called when an attempt is made to select it in the window containing it and that shifts the focus back to the toplevel window itself, which prevents the selection from happening.
One solution is simply to not use a <FocusOut> callback function at all. Instead, first add a top.focus_force() call to the end of toplevel_window() function to switch the focus to to it immediately after it's created.
Secondly, to keep the focus on the windows with the Combobox and make a bell alert sound when attempts are made to switch focus away from the it, you can bind a <FocusIn> callback to the root window and check the status of the other window in it (and prevent the focus from being changed if it exists and is being displayed).
Here's what I'm suggesting:
import tkinter as tk
import tkinter.ttk as ttk
from _tkinter import TclError
def toplevel_window():
global top, cb
top = tk.Toplevel(root)
top.title("TOP")
top.geometry("300x300")
cb = ttk.Combobox(top, values=["djdjd", "fjfjf"])
cb.pack()
btn = tk.Button(top, text="print", command=combo_select)
btn.pack(side=tk.BOTTOM)
top.bind("<<ComboboxSelected>>", combo_select)
top.focus_force()
def combo_select(event=None):
print('cb.get():', cb.get())
def root_focusin_callback(event):
try:
top_state = top.state() # Check status of toplevel widget.
except (NameError, TclError) as exc:
pass # Ignore - widget doesn't exist or was closed.
else:
top.bell()
top.focus_force()
root = tk.Tk()
root.geometry("600x600")
root.title("root")
root.bind("<FocusIn>", root_focusin_callback)
b = tk.Button(text="OPEN TOPLEVEL", command=toplevel_window)
b.pack()
root.mainloop()

Related

How to close the Tkinter window when the mouse clicked away from the Tkinter window?

Good days all, I am new here, and I have stuck the problem a few days a problem currently with Tkinter, I have done some research about how to close Tkinter window when the mouse has clicked away from it but there are not much information to do so.
So, my problem is how to close the Tkinter window when the mouse clicked outside the Tkinter? I have tried the method of FocusOut to my Tkinter. However, I have tried to bind with root, it will close the window even though I clicked inside the frame widget. Then, I bind with the frame, the Tkinter will close when I clicked outside the Tkinter. Therefore, I have proved that the idea to close the Tkinter is works so far.
Then a new problem has happened, when I clicked the Combobox widget in the window, the window will close also. Is there any better solution to prove this concept?
Here is the code to indicate my problem.
import tkinter as tk
from tkinter import StringVar, ttk,messagebox
root = tk.Tk()
root.title("Sample Window")
root.minsize(300,350)
info_frame = tk.LabelFrame(root, text = "Information")
info_frame.pack(padx = 5, pady = 5 , fill = "both",expand=True)
tabControl = ttk.Notebook(info_frame)
person1tab = ttk.Frame(tabControl)
tabControl.add(person1tab,text = "Person1")
tabControl.pack(expand=1,fill="both")
person2tab = ttk.Frame(tabControl)
tabControl.add(person2tab,text = "Person2")
tabControl.pack(expand=1,fill="both")
fname_var = tk.StringVar()
lname_var = tk.StringVar()
gender_var = tk.StringVar()
age_var = tk.IntVar()
fname_label = tk.Label(person1tab, text = "First name:").pack(padx=5,pady=3)
fname_entry = tk.Entry(person1tab, textvariable=fname_var).pack(padx=5,pady=3)
lname_label = tk.Label(person1tab, text = "Last name:").pack(padx=5,pady=3)
lname_entry = tk.Entry(person1tab, textvariable=lname_var).pack(padx=5,pady=3)
gender_label = tk.Label(person1tab, text = "Gender:").pack(padx=5,pady=3)
gender_combo = ttk.Combobox(person1tab, textvariable=gender_var,state='readonly')
gender_combo['values'] = ('Male','Female')
gender_combo.current(0)
gender_combo.pack(padx=5,pady=3)
age_label = tk.Label(person1tab, text = "Age:").pack(padx=5,pady=3)
age_label = tk.Entry(person1tab, textvariable=age_var).pack(padx=5,pady=3)
page2label = tk.Label(person2tab,text = "This is tab 2.").pack(padx=5,pady=3)
def lossfocus(event):
root.quit()
pass
tabControl.bind('<FocusOut>', lossfocus)
root.mainloop()
You can still bind <FocusOut> on root window, but you need to check:
whether the widget that trigger this event is root window
no other widget in this root window getting the focus:
def lossfocus(event):
if event.widget is root:
# check which widget getting the focus
w = root.tk.call('focus')
if not w:
# not widget in this window
root.destroy()

Why do I get an extra empty window in Tkinter?

Here is my code:
from tkinter import *
OPTIONS = ["Available","Busy","Invisible","Away"]
now = Toplevel()
variable = StringVar(now)
variable.set(OPTIONS[0]) # default value
details = {"U_status":""}
def verify():
global u_status
details["U_status"]=variable.get()
print ("value is:" + variable.get())
now.destroy()
def status():
w = OptionMenu(now, variable, *OPTIONS)
w.pack()
button = Button(now, text="OK", command=verify, relief='flat')
button.pack()
if __name__=='__main__':
status()
mainloop()
While running the above code, along with the window (I wanted) another empty window appears. Can anyone figure out what is wrong in this code?
Here now = Toplevel() should be replaced with Tk(), like:
now = Tk()
When you use Toplevel() a Tk() window is made in the background, if its not already made(your case), and that is the reason you are getting a blank new window. Actually that blank window is your main window.
Toplevel() is used to make child windows for the parent Tk() windows,ie, if you want sub windows within your main window(now), you will use Toplevel(). Because more than one Tk() in your code will cause some errors later on.
The blank window is actually the root window of your app that tkinter creates by default. You probably want to be explicit, and create a tk.Tk() root, and keep a reference to it.
New windows can be spawned and destroyed at leisure; your app will continue to exist as long as you keep the root active.
Maybe something like this:
import tkinter as tk
def verify():
now = tk.Toplevel(root)
details["U_status"] = variable.get()
txt = f'value is: {details["U_status"]}'
tk.Label(now, text=txt).pack()
now.after(3000, now.destroy)
def status():
tk.OptionMenu(root, variable, *OPTIONS).pack()
tk.Button(root, text="OK", command=verify, relief='flat').pack()
if __name__=='__main__':
OPTIONS = ["Available", "Busy", "Invisible", "Away"]
root = tk.Tk()
variable = tk.StringVar(root)
variable.set(OPTIONS[0])
details = {"U_status": ""}
status()
root.mainloop()

Getting variable out of Tkinter

I would like to ask if anyone knows how to get out a variable from an Entry in Tkinter to be used in future calculation.
Let us assume that I want to create a prompt where the user needs to place two numbers in the two different Entry widgets.
These numbers are to be used in another script for calculation. How can I retrieve the values from the prompt created in Tkinter?
In my opinion, I would need to create a function with the code bellow and make it return the value from the Tkinter prompt. However, I cannot return the numbers because I'm destroying the root window. How can I get pass this, preferably without global variables.
Best Regards
from tkinter import *
from tkinter import ttk
#Start of window
root=Tk()
#title of the window
root.title('Title of the window')
def get_values():
values=[(),(value2.get())]
return values
# Creates a main frame on the window with the master being the root window
mainframe=ttk.Frame(root, width=500, height=300,borderwidth=5, relief="sunken")
mainframe.grid(sticky=(N, S, E, W))
###############################################################################
#
#
# Label of the first value
label1=ttk.Label(master=mainframe, text='First Value')
label1.grid(column=0,row=0)
# Label of the second value
label2=ttk.Label(master=mainframe, text='Second Value')
label2.grid(column=0,row=1)
###############################################################################
#
#
# Entry of the first value
strvar1 = StringVar()
value1 = ttk.Entry(mainframe, textvariable=strvar1)
value1.grid(column=1,row=0)
# Entry of the second value
strvar2 = StringVar()
value2 = ttk.Entry(mainframe, textvariable=strvar2)
value2.grid(column=1,row=1)
# Creates a simplle button widget on the mainframe
button1 = ttk.Button(mainframe, text='Collect', command=get_values)
button1.grid(column=2,row=1)
# Creates a simplle button widget on the mainframe
button2 = ttk.Button(mainframe, text='Exit', command=root.destroy)
button2.grid(column=2,row=2)
root.mainloop()
You use a class because the class instance and it's variables remain after tkinter exits.https://www.tutorialspoint.com/python/python_classes_objects.htm And you may want to reexamine some of your documentation requirements, i.e. when the statement is
"root.title('Title of the window')", adding the explanation "#title of the window" is just a waste of your time..
""" A simplified example
"""
import sys
if 3 == sys.version_info[0]: ## 3.X is default if dual system
import tkinter as tk ## Python 3.x
else:
import Tkinter as tk ## Python 2.x
class GetEntry():
def __init__(self, master):
self.master=master
self.entry_contents=None
self.e = tk.Entry(master)
self.e.grid(row=0, column=0)
self.e.focus_set()
tk.Button(master, text="get", width=10, bg="yellow",
command=self.callback).grid(row=10, column=0)
def callback(self):
""" get the contents of the Entry and exit
"""
self.entry_contents=self.e.get()
self.master.quit()
master = tk.Tk()
GE=GetEntry(master)
master.mainloop()
print("\n***** after tkinter exits, entered =", GE.entry_contents)
So, I have taken Curly Joe's example and made a function with the his sketch
The final result, for anyone wanting to use this as a template for a input dialog box:
def input_dlg():
import tkinter as tk
from tkinter import ttk
class GetEntry():
def __init__(self, master):
self.master=master
self.master.title('Input Dialog Box')
self.entry_contents=None
## Set point entries
# First point
self.point1 = ttk.Entry(master)
self.point1.grid(row=0, column=1)
self.point1.focus_set()
# Second point
self.point2 = ttk.Entry(master)
self.point2.grid(row=1, column=1)
self.point2.focus_set()
# labels
ttk.Label(text='First Point').grid(row=0, column=0)
ttk.Label(text='Second Point').grid(row=1, column=0)
ttk.Button(master, text="Done", width=10,command=self.callback).grid(row=5, column=2)
def callback(self):
""" get the contents of the Entries and exit the prompt"""
self.entry_contents=[self.point1.get(),self.point2.get()]
self.master.destroy()
master = tk.Tk()
GetPoints=GetEntry(master)
master.mainloop()
Points=GetPoints.entry_contents
return list(Points)
In python, functions are objects, as in get_values is an object.
Objects can have attributes.
Using these two, and the knowledge that we can't really return from a button command, we can instead attach an attribute to an already global object and simply use that as the return value.
Example with button
try: # In order to be able to import tkinter for
import tkinter as tk # either in python 2 or in python 3
except ImportError:
import Tkinter as tk
def on_button_press(entry):
on_button_press.value = entry.get()
entry.quit()
def main():
root = tk.Tk()
entry = tk.Entry(root)
tk.Button(root, text="Get Value!", command=lambda e = entry : on_button_press(e)).pack()
entry.pack()
tk.mainloop()
return on_button_press.value
if __name__ == '__main__':
val = main()
print(val)
Minimalistic example
Similarly modules are also objects, if you want to avoid occupying global namespace extremely, you can attach a new attribute to the module you're using
See:
try: # In order to be able to import tkinter for
import tkinter as tk # either in python 2 or in python 3
except ImportError:
import Tkinter as tk
if __name__ == '__main__':
tk.my_value = lambda: [setattr(tk, 'my_value', entry.get()), root.destroy()]
root = tk.Tk()
entry = tk.Entry(root)
root.protocol('WM_DELETE_WINDOW', tk.my_value)
entry.pack()
tk.mainloop()
print(tk.my_value)

How to destroy widgets?

I want in my if statement for it to destroy the buttons on my tkinter. I have tried a couple of methods and looked up a few and some i don't understand/too complicated. I have tried making the function create a new window but it isn't displaying.
def greenwin():
global tkinter
global Tk
root = Tk()
root.title("GAME OVER")
root.geometry('387x387')
gamelabel=Label(root,text="GAME OVER!GREENS
WIN!",width=33,height=15).place(x=150,y=150)
root.mainloop
return
I want a clear method of destroying widgets.I would like a function that destroys all these buttons for my tic tac toe.
but1=Button(root,text="",bg="white",width=11,height=5,command=colour1).place(x=0,y=0)
but2=Button(root,text="",bg="white",width=11,height=5,command=colour2).place(x=0,y=150)
but3=Button(root,text="",bg="white",width=11,height=5,command=colour3).place(x=0,y=300)
but4=Button(root,text="",bg="white",width=11,height=5,command=colour4).place(x=150,y=0)
but5=Button(root,text="",bg="white",width=11,height=5,command=colour5).place(x=150,y=150)
but6=Button(root,text="",bg="white",width=11,height=5,command=colour6).place(x=150,y=300)
but7=Button(root,text="",bg="white",width=11,height=5,command=colour7).place(x=300,y=0)
but8=Button(root,text="",bg="white",width=11,height=5,command=colour8).place(x=300,y=150)
but9=Button(root,text="",bg="white",width=11,height=5,command=colour9).place(x=300,y=300)
root.mainloop
import tkinter as tk
root = tk.Tk()
any_widget = tk.Button(root, text="Press to destroy!")
any_widget['command'] = any_widget.destroy # pay special attention to the lack of ()
# call any_widget.destroy(), button widget's command option specifically needs a
# reference to the method instead of an actual call
any_widget.pack()
root.mainloop()
Try this:
import tkinter as tk
root = tk.Tk()
root.geometry("500x300+10+13")
root.title("Test")
b = tk.Button(root, text="click me")
def onclick(evt):
w = evt.widget
w.destroy()
b.bind("<Button-1>", onclick)
b.pack()
root.mainloop()

How do you close a tkinter window in another function?

I want a button in my window to open a new window and close the previous one. Is it possible to have one button do both of these? I've tried in the following code, but it hasn't worked, just told me that window is not defined:
import tkinter
def window1():
window = tkinter.Tk()
tkinter.Button(window, text = "Next", command = window2).pack()
window.mainloop()
def window2():
window.destroy() #This is where the error is
menu = tkinter.Tk()
etc, etc, etc
window1()
First, you need to return the window object from the first function:
def window1():
window = tkinter.Tk()
tkinter.Button(window, text = "Next", command = lambda: window2(window)).pack()
window.mainloop()
return window
Then, you need to pass the window as an argument to your function:
def window2(window):
window.destroy()
menu = tkinter.Tk()
And then call window1 with:
window = window1()
and click the button to destroy it and do the rest
This is an example using Toplevels, which is usually a better choice than creating, destroying, re-creating Tk() instances. The unique Toplevel ID is passed to the close_it function using partial(). You would, of course, combine them or have the close function call the open function.
try:
import Tkinter as tk ## Python 2.x
except ImportError:
import tkinter as tk ## Python 3.x
from functools import partial
class OpenToplevels():
""" open and close additional Toplevels with a button
"""
def __init__(self):
self.root = tk.Tk()
self.button_ctr=0
but=tk.Button(self.root, text="Open a Toplevel",
command=self.open_another)
but.grid(row=0, column=0)
tk.Button(self.root, text="Exit Tkinter", bg="red",
command=self.root.quit).grid(row=1, column=0, sticky="we")
self.root.mainloop()
def close_it(self, id):
id.destroy()
def open_another(self):
self.button_ctr += 1
id = tk.Toplevel(self.root)
id.title("Toplevel #%d" % (self.button_ctr))
tk.Button(id, text="Close Toplevel #%d" % (self.button_ctr),
command=partial(self.close_it, id),
bg="orange", width=20).grid(row=1, column=0)
Ot=OpenToplevels()
Yes. Is possible. But you'll need to def that:
def window1:
blablabla
blablabla
def window2:
window2.destroy() <-- Here where the error was
How you noticed, put your name of window what you want Destroy and it will work!
using Python3
You could use a "global" such as:
root = Tk()
root.title('This is the root window')
def window_create():
global window_one
window_one = Tk()
window_one.title('This is window 1')
Then, from any function (or elsewhere) when you want to destroy window_one, do:
def window_destroyer():
window_one.destroy()
You could call your window_destroyer function from a button anywhere such as root which the example shows:
kill_window_btn = Button(root, text="Destroy", command=window_destroyer).pack()
Of course, follow your own naming conventions. :)
It seems to me, just 'global window_one' would solve it.

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