Hi,
On Sat, 08 Aug 2015 17:59:16 +0300
Alexander Uvizhev <uvi...@yandex.ru> wrote:
>
> Hi,
> Recently I came across some strangeness in tkinter Text widget. I bind
> <Configure> event to it and the first time I insert text into widget
> the callback is called and reports wrong 'displaylines' count. Here is
(...)
>
> Is it what's supposed to be or some sort of bug?
I guess something like this happens:
* the text widget is created, but initially, before it is actually drawn
onto screen, has virtually a size of 1*1 px
* because of this the inserted 10-character text string is wrappped into
10 lines
* this is when the first <Configure> event is triggered and so it
in fact correctly reports 10 lines
* subsequent calls to insert() do not trigger a <Configure> event
* the next >cConfigure> event is triggered when the window is actually
drawn after mainloop() is called, however in your example then the
binding was already removed
I modified your example a little to illustrate what I mean, without the
unbind(); you can see then that after the window is visible the reported
lines are as expected:
###############################
import tkinter
def check(event):
print(event.widget.winfo_width(), event.widget.winfo_height())
print(event.widget.count('1.0', 'end', 'displaylines'))
print()
root = tkinter.Tk()
master = tkinter.Frame(master=root)
master.pack(fill='both', expand=1)
text = tkinter.Text(master=master)
text.bind('<Configure>', check)
text.pack(fill='both', expand=1)
text.insert('1.0', "1234567890") # first time insert
text.insert('1.0', "1234567890") # second
master.mainloop()
##############################
Best regards
Michael
.-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-.
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