I want my script should work in such a way that, close all the previous windows in tkinter.
If I minimise the existing pop up window and again I will run same script, it will again pop up new window. How can I close the already existing window, when i run script again?
Simple code:
import Tkinter as tk
root = tk.Tk()
root.mainloop()
Maybe if you check all variable in locals and see if you have tk type in it?
import tkinter as tk
root = tk.Tk()
tk_type = type(root)
print(tk_type)
var=0
for var in locals().items():
if type(var[1]) == tk_type:
print(var, 'to be deleted')
root.mainloop()
something like this where you can put the test at the begining of the class to see if it exists other TK window object.
I'm sure it should exist a better solution though.
Related
I'm somewhat new to python (started in Nov.) and after complete my first "program" I'm trying to built the GUI using Tkinter. I want to put the program on a Toplevel that I've created and have it run, but all Tkinter tutorials only talk about widgets and I don't know how to specify that a code should run on a specific Toplevel window. The best I can figure is to run the in the section where I define the Toplevel as shown in the example below, but that is not working.
from tkinter import *
import tkinter as tk
root=Tk()
root.geometry("500x200")
root.title('Test')
Label(root, text="Test").pack()
def test():
gen_win = Toplevel(root)
gen_win.title("Test")
gen_win.geometry("500x500")
Label(gen_win, text="Test").pack()
print(2+2)
btn_test=tk.Button(root, text="test", command=test).pack(fill=tk.X)
root.mainloop()
The example program (print(2+2)) doesn't print on the toplevel. Any ideas?
#jasonharper gave the correct answer:
"Code doesn't "run on a specific Toplevel window". It just runs, and if it happens to create a widget, or modify the contents of an existing widget, that change becomes visible as soon as your code returns to the mainloop. Label(gen_win, text=str(2+2)).pack() would be the simplest way to make your addition results visible in the window."
I'm using the following code to create a window after destroying another.
from tkinter import *
tk=Tk()
def destroy():
tk.destroy()
tk.after(2000,destroy)
tk.mainloop()
tk=Tk()
tk.mainloop()
The window is created alright, but it loses focus. I tried lift() and focus() methods with no result.
You can use <tk.Tk>.focus_force() to force the window to be focused.
So your modified code will look like this:
from tkinter import *
tk = Tk()
def destroy():
tk.destroy()
tk.after(2000, destroy)
tk.mainloop()
tk = Tk()
tk.focus_force()
tk.mainloop()
Although it is much better to reuse the window. Destroy all of the widgets on the window and reuse it instead of destroying and recreating it. Creating a window takes a lot of resources.
Also something else: the variable tk is usually used for something else so please don't use it for tkinter windows. Usually people use root or window for windows.
Force the input focus to the widget using focus_force(). Just update you last part.
tk=Tk()
tk.focus_force()
tk.mainloop()
Also, You can make a Toplevel() which is basically just creating a new window over the root window.
from tkinter import *
tkk=Tk()
tkk.withdraw()
tk=Toplevel()
def destroy():
tk.destroy()
tkk.deiconify()
tk.after(2000,destroy)
tk.focus_force()
tkk.mainloop()
I am running my performance test on python and I want to call some Tcl commands using Tkinter inside my python script.
Can somebody please help me to write the code,
import Tkinter
root = Tkinter.Tk()
root.tk.eval('puts {printed by tcl}')
I tried simply above example, here when I do root=tkinter.tk() it opens up a window, I just want to execute my command and get the result
The code you have tried will not show any window until you put the root.mainloop(),but you can try something like this,
import tkinter
root = tkinter.Tk()
root.withdraw()
root.tk.eval('puts {printed by tcl}')
root.destroy()
root.mainloop()
here withdraw() will remove the window from the screen without destroying it and then you can perform your tasks and then destroy it at the end of code.
I'm running python 3 code in background which should show a popup window in some situations. I'm using tkinter for this:
import tkinter as tk
from tkinter import messagebox
def popup(message, title=None):
root = tk.Tk()
root.withdraw()
root.wm_attributes("-topmost", 1)
messagebox.showinfo(title, message, parent=root)
root.destroy()
popup('foo')
The ok-button in this infobox should get the focus automatically when popping up. Sadly I'm not able to do this. I tried root.focus(), but it does not help. Any ideas how to solve that? TIA
BTW: The code should be platform independent (Linux and Windows).
Edit:
Maybe I missunderstood the focus keyword and I should clarify my question:
root = tk.Tk()
root.focus_force()
root.wait_window()
When calling the code above the root window is active, even if I worked in e.g. the browser before. Is this also possible for messagebox.showinfo? Adding root.focus_force() in the popup function does not help.
Is this even possible? Or is it necessary to create my own root window? I really like the appearance of the messagebox with the icon.
Edit 2:
Here is a video: https://filebin.net/no195o9rjy3qq5c4/focus.mp4
The editor is the active window, even after the popup was shown.
In Linux I it works as expected.
You can use the default argument in the messagebox function.
default constant
Which button to make default: ABORT, RETRY, IGNORE, OK, CANCEL, YES, or NO (the constants are defined in the tkMessageBox module).
So, here is an example to highlight the "ok" button.
import tkinter as tk
from tkinter import messagebox
def popup(message, title=None):
root = tk.Tk()
root.withdraw()
messagebox.showinfo(title, message, parent=root, default = "ok")
root.destroy()
popup('foo')
Hope this helps!
In the code below, the first dialog box gets focus immediately, so the user can just type an answer and press enter. In the second one, that doesn't seem to happen when running in Windows. Running Raspbian 9, both windows get focus when they open.
Is there any way I can get both windows to get focus when they open in Windows?
import tkinter as tk
from tkinter import simpledialog
root = tk.Tk()
root.withdraw()
answer1 = simpledialog.askstring("Test1","This one gets focus when it opens",parent=root)
answer2 = simpledialog.askstring("Test2","This one doesn't",parent=root)
I have watched this question for a few days now hoping someone might shed some light on this issue. I'm running Python 3.6.5 under windows 10 and get the same problem.
I have tried several different things but it seems Microsoft does things their own way. I have finally found a thing that works, but only if you don't hide the root window:
import tkinter as tk
from tkinter import simpledialog
root = tk.Tk()
#root.withdraw() # This does not work if you hide the root window
root.update_idletasks()
answer1 = simpledialog.askstring("Test1","This one gets focus",parent=root)
root.update_idletasks()
answer2 = simpledialog.askstring("Test2","This one doesn't",parent=root)
I found the following worked (with a small flicker of the root window on destroy()):
root = tk.Tk()
root.withdraw()
filename = filedialog.askopenfilename()
root.deiconify()
root.destroy()