To answer my own question: the focus was being given to another widget after
the code in question had executed.
That said, I still don't understand why focus_set followed by update_idletasks
followed by focus_get would return None, but tkinter something works in strange
and mysterious ways.
Cheers
Cam
On 2024-01-10 08:44, Cam Farnell wrote:
In a rather large program I have this code:
self.TextWidget.focus_set()
print("type(self.TextWidget)=%s"%type(self.TextWidget))
print('Focus_get()=%s'%self.focus_get())
The goal is to have TextWidget get the focus. Usually it does, but there is one
particular circumstance when it does not get the focus. The "print" lines I
added for debugging.
The output from the print functions is:
type(self.TextWidget)=<class 'rpWidgets.ColorizedText'>
Focus_get()=None
TextWidget is an instance of rpWidgets.ColorizedText which is created thus:
class ColorizedText(tkinter.Text):
which is to say, it's just a tkinter.Text to which I've added methods.
I've tried creating a minimum example without success.
My questions is: how is it possible for TextWidget to NOT have the focus
immediately after a call to focus_set?
Changing focus_set to focus_force makes no difference.
Invoking update_idletasks() after the focus_set makes no difference.
The TextWidget in question is visible on the screen, and pressing Tab a couple
of times does get it the focus.
Having spent some hours chasing this I'm a tad frustrated, but quite open to
suggestions about what to look for.
Cheers
Cam Farnell
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