Editing text with an external editor in Python
tjreedy at udel.edu
Wed Sep 3 03:49:25 CEST 2014
On 9/2/2014 5:36 PM, Chris Angelico wrote:
> On Wed, Sep 3, 2014 at 7:14 AM, Terry Reedy <tjreedy at udel.edu> wrote:
>> import tkinter as tk
>> root = tk.Tk()
>> text = tk.Text()
>> I tested tested the functions and wrote the following.
>> This is a test text entry.
>> Enter and Tab work as expected.
>> The Arrow (Cursor) keys work as expected.
>> CntL-Left and Cntl-Right move a word at time.
>> Home and End move to beginning and end of the line.
>> Cntl-Home and Cntl-Up move to the beginning of the text.
>> Cntl-End and Cntl-Donw move to the end of the text.
>> Shift + cursor movement selects between the begin and end slice positions.
>> PageUp and PageDown are inoperative.
My mistake. See below.
>> Delete and Backspace work as expected.
>> At least on Windows, I can select text and delete,
>> or cut or copy to Clipboard.
>> I can also paste from the clipboard.
>> In otherwords, this is a functional minimal text entry widget.
'Minimal' mean minimal, as in the minimal number of lines of code to
actually work (4), as a the minimum needed to prove the concept, and a
starting point for adding more things.
> Err, that's not all it takes to run an editor :) File opening
The opening premise of the thread was something like "Input() is good
for getting a single line of text input from a user. What about getting
multiple lines of text?" Opening a non-empty existing file is not
relevant to the purpose of extending input(). I intentionally said
'text entry widget', not 'editor'. For editing a particular existing
text, the app might pre-load the widget with that text.
> saving would be kinda helpful, for a start...
It is really annoying when someone clips (erases) something I said and
then says that I should have said what I did say. Here it is again!
>> In use, a save function would have to be added.
The function does not have to be attached to menu widget. When one
imports a patch into a mercurial repository, hg offers the opportunity
to enter a multi-line commit message. Just the scenario this thread
started with. It opens a text entry window something like tkinter.Text.
It is preloaded with something like the following.
|Enter commit message above the line|
|or leave blank to abort commit. |
|Close window when done. |
Hg intercepts the window close event to grab the entered text, if any,
before it disappears.
> But that's what I meant when I said that a multi-line entry field is
> an extremely standard widget. (I'm a bit surprised that PgUp/PgDn
> don't work,
My mistake. They do when I add more lines than fit in the window.
Terry Jan Reedy
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