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POCreate a python tkinter window with no X (close) button
 

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    <p>I'm writing a 'wizard' type Python Tkinter GUI that collects information from the user and then performs several actions based on the user's entries: file copying, DB updates, etc. The processing normally takes 30-60 seconds and during that time, I want to:</p> <ol> <li>Provide the user with text updates on the activity and progress</li> <li>Prevent the user from closing the app until it's finished what it's doing</li> </ol> <p>I started on the route of having the text updates appear in a child window that's configured to be <code>trainsient</code> and using <code>wait_window</code> to pause the main loop until the activities are done. This worked fine for other custom dialog boxes I created which have OK/cancel buttons that call the window's <code>destroy</code> method. The basic approach is:</p> <pre><code>def myCustomDialog(parent,*args): winCDLG = _cdlgWin(parent,*args) winCDLG.showWin() winCDLG.dlgWin.focus_set() winCDLG.dlgWin.grab_set() winCDLG.dlgWin.transient(parent) winCDLG.dlgWin.wait_window(winCDLG.dlgWin) return winCDLG.userResponse class _cdlgWin(): def __init__(self,parent,*args): self.parent = parent self.dlgWin = tk.Toplevel() self.userResponse = '' def showWin(self): #Tkinter widgets and geometry defined here def _btnOKClick(self): #self.userResponse assigned from user entry/entries on dialog self.dlgWin.destroy() def _btnCancelClick(self): self.dlgWin.destroy() </code></pre> <p>However this approach isn't working for the new monitor-and-update dialog I want to create.</p> <p>First, because there's no user-initiated action to trigger the copy/update activities and then the <code>destroy</code>, I have to put them either in showWin, or in another method. I've tried both ways but I'm stuck between a race condition (the code completes the copy/update stuff but then tries to destroy the window before it's there), and never executing the copy/update stuff in the first place because it hits the <code>wait_window</code> before I can activate the other method.</p> <p>If I could figure out a way past that, then the secondary problem (preventing the user from closing the child window before the work's done) is covered by the answers below.</p> <p>So... is there any kind of bandaid I could apply to make this approach work the way I want? Or do I need to just scrap this because it can't work? (And if it's the latter, is there any way I can accomplish the original goal?)</p>
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