I am trying to restart my main GUI/Halt the program flow when I Click on the "X" button in my tkinter messagebox . Any idea how can I do this ?
PS: I have read the many threads about closing the main GUI itself but nothing specific to messagebox
By default , my code proceeds to ask me for an output path using the filedailog.askdirectory() method when clicking "ok", or on closing the messagebox
My message box and the main GUI in the background
There's no simple way to add a custom handler to the "X" button. I think it's better to use messagebox.askokcancel() variation of messageboxes instead of showinfo, and halt the program if the returned result is False:
import tkinter as tk
from tkinter import messagebox, filedialog
root = tk.Tk()
def show_messagebox():
result = messagebox.askokcancel("Output path", "Please select an output file path")
if result:
filedialog.askdirectory()
else:
messagebox.showinfo("Program is halted")
tk.Button(root, text="Show messagebox", command=show_messagebox).pack()
root.mainloop()
Or, even simpler, you can just show filedialog.askdirectory() directly. If the user doesn't want to choose directory, they can click on the "Cancel" button, and then the program checks if there was empty value returned, and halts if so:
import tkinter as tk
from tkinter import messagebox, filedialog
root = tk.Tk()
def show_askdirectory():
directory = filedialog.askdirectory(title="Please select an output file path")
if not directory:
messagebox.showinfo(message="The program is halted")
else:
messagebox.showinfo(message="Chosen directory: " + directory)
tk.Button(root, text="Choose directory", command=show_askdirectory).pack()
root.mainloop()
Related
I am running a simple python script that opens a window with a button inside of it. When the user clicks the button a dialog box opens and asks the user to select a file directory. I want to pull that directory location out of the function. This is what the code looks like:
from tkinter import *
from tkinter import filedialog
def openFile():
filePath= filedialog.askdirectory()
return filePath
window = Tk()
button = Button(text="open", command=openFile)
button.pack()
window.mainloop()
I would like the file directory to be saved in a variable inside the window. I am able to print the filepath inside the function but I am unable to bring it out of the function.
Any help will be greatly appreciated
You cannot use the return value for functions added to buttons, as there is no way of picking up whatever is returned.
So instead you can write the return to a global variable, or a class variable, instead. Example with global variable below;
from tkinter import *
from tkinter import filedialog
my_path = None
def openFile():
global my_path
filePath = filedialog.askdirectory()
my_path = filePath
window = Tk()
button = Button(text="open", command=openFile)
button.pack()
window.mainloop()
You will then be able to pick up the my_path variable later in your script after clicking the button.
When I run this script, two windows appear, one for the file selection and the Tkinter window. How can I change this so that the Tkinter window only opens after a file has been selected? Thanks
def main():
my_file = askopenfilename()
stage1()
def stage1():
master = Tk()
master.mainloop()
The window master does open only after the file dialog closure (try to change its title to check), the first window you see is the parent window of the file dialog. Indeed, the tkinter file dialogs are toplevel windows, so they cannot exist without a parent window. So the first window you see is the parent window of the file dialog.
The parent window can however be hidden using the withdraw method and then restored with deiconify:
from tkinter import Tk
from tkinter.filedialog import askopenfilename
def main():
master = Tk()
master.withdraw() # hide window
my_file = askopenfilename(parent=master)
master.deiconify() # show window
master.mainloop()
if __name__ == '__main__':
main()
I want to launch an "Open File" dialog in Tkinter in Python 2.7.
My code starts with:
from Tkinter import Frame, Tk, BOTH, Text, Menu, END
import tkFileDialog as tkfd
import fileinput
root = Tk()
global strTab
strTab = ""
def openTab(event):
r = tkfd.askopenfilename()
strTab = unicodedata.normalize('NFKD', r).encode('ascii','ignore')
Later in the code I have:
btnLoadTab = Button(root,
text="Load Tab",
width=30,height=5,
bg="white",fg="black")
btnLoadTab.bind("<Button-1>", openTab)
btnLoadTab.pack()
root.mainloop()
When I press the button an "Open File" dialog is shown, but when I select a file it closes and the button remains "clicked".
If I later call to strTab outside of openTab, it remains equal to "".
You can find workable example here: http://www.python-course.eu/tkinter_dialogs.php
trying to make a GUI with an 'open file' button. When I run the code shown below, the open file dialog opens straight away, and not when I press the button. Why? Is there a simple way to fix this that doesn't involve using classes? (I don't currently know anything about classes and am working on a time-pressured project)
from tkinter import *
interface = Tk()
def openfile():
return filedialog.askopenfilename()
button = ttk.Button(interface, text = "Open", command = openfile())
button.grid(column = 1, row = 1)
interface.mainloop()
The code is passing the return value of the openfile function call, not the function itself. Pass the function itself by removing trailing () which cause a call.
from tkinter import *
from tkinter import ttk
from tkinter import filedialog
interface = Tk()
def openfile():
return filedialog.askopenfilename()
button = ttk.Button(interface, text="Open", command=openfile) # <------
button.grid(column=1, row=1)
interface.mainloop()
I use this to get yes/no from user but it opens an empty window:
from Tkinter import *
from tkMessageBox import *
if askyesno('Verify', 'Really quit?'):
print "ok"
And this empty window doesnt go away. How can I prevent this?
This won't work:
Tk().withdraw()
showinfo('OK', 'Select month')
print "line 677"
root = Tk()
root.title("Report month")
months = ["Jan","Feb","Mar"]
sel_list = []
print "line 682"
def get_sel():
sel_list.append(Lb1.curselection())
root.destroy()
def cancel():
root.destroy()
B = Button(root, text ="OK", command = get_sel)
C = Button(root, text ="Cancel", command = cancel)
Lb1 = Listbox(root, selectmode=SINGLE)
for i,j in enumerate(months):
Lb1.insert(i,j)
Lb1.pack()
B.pack()
C.pack()
print "line 702"
root.mainloop()
for i in sel_list[0]:
print months[int(i)]
return months[int(sel_list[0][0])]
Tkinter requires that a root window exist before you can create any other widgets, windows or dialogs. If you try to create a dialog before creating a root window, tkinter will automatically create the root window for you.
The solution is to explicitly create a root window, then withdraw it if you don't want it to be visible.
You should always create exactly one instance of Tk, and your program should be designed to exit when that window is destroyed.
Create root window explicitly, then withdraw.
from Tkinter import *
from tkMessageBox import *
Tk().withdraw()
askyesno('Verify', 'Really quit?')
Not beautiful solution, but it works.
UPDATE
Do not create the second Tk window.
from Tkinter import *
from tkMessageBox import *
root = Tk()
root.withdraw()
showinfo('OK', 'Please choose')
root.deiconify()
# Do not create another Tk window. reuse root.
root.title("Report month")
...