[Tkinter-discuss] Text and newlines [newbie Q]

[Michael Lange]

Hi,

Thus spoketh <spooky.ln at tbs-software.com> 
unto us on Mon, 3 Jan 2011 13:50:44 +0100:

> hi all,
> i have little method for parsing line in tkinter.Text.
> text.bind(‘<Return>’, parse)
> def parse(event=None):
>     text = get_current_line()                                     #
> this give me whole text on line pattern = r”^.*define\s<?
> P<defkeyword>.*):$”  # simple search pattern reg = re.compile(pattern,
> re.S|re.M)                   # for use with more patterns match =
> re.search(reg, text) if match:
>         print(‘found %s definition.’ % match.group(‘defkeyword’))
>         text.insert(‘end’, ‘\n’)
>         text.insert(‘insert linestart’, ‘\t’)
> there is small problem for me. how to insert tab into newline without
> next ‘\n’ ? i want only 2 lines not 3.
> i want:
> 1.    define some:
> 2.    .......[next insert will be here]
> and not:
> 1.    define some:
> 2.    .......
> 3.    [now ‘end’ points here]

I am not sure what exactly you mean, simply changing your example into

    if match:
        print(‘found %s definition.’ % match.group(‘defkeyword’))
        text.insert(‘end’, ‘\t’)

does probably not what you want?

> and second how i define width of tab in chars not in pixels using
> text.config(tabs=X) thanks.

This is explained in the text man page:

    To achieve a different standard spacing, for example every 4
    characters, simply configure the widget with ``-tabs "[expr {4 * [font
    measure $font 0]}] left" -tabstyle wordprocessor''.

"Translated" into python this would be something like:

from Tkinter import *
import tkFont

root=Tk()

f = tkFont.Font(family='courier', size=-12)
text = Text(root, font=f, tabs=(4 * f.measure(0), 'left'), tabstyle='wordprocessor')
text.pack(fill=BOTH, expand=1)

root.mainloop()

Obviously f.measure(0) returns the average width of a character, although
this behavior doesn't seem to be documented.

Regards

Michael

.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

Only a fool fights in a burning house.
		-- Kank the Klingon, "Day of the Dove", stardate unknown