From Newsgroup: comp.lang.tcl

(tl;dr - skip to the ---)

I'm working to extend a long-running project of mine that parses text
files and loads the parsed content into a database.

From time to time, I have a brainwave and extend he parser to wring out
a little more content. Following this, I rebuild the database by
re-parsing all the text.

Some of the text sources lack some pretty fundamental items of data, and
one in particular provides incorrect values for one datum.

I'm cǔrrently extending the system to allow the client of the parser to provide default and override values to be saved, respectively if the
parsed data doesn't provide data or if the data is known to be
unreliable. To allow the existing contents of the database to be
corrected I've developed a mechanism to modify data that's already been parsed.

The next question that arises is what do to when rebuilding the
database? I'm writing all the default and overriding values, as well as post-save modifications to the database (changed rows) and can replay
them when the text files are re-parsed.

The final issue is what to do if the user makes a mistake with a
modification and wants to roll it back? My solution is that when the
user starts a rebuild, I will present them a display of all the changed
rows so they can specify which changes to retain.

-----

Now (at long last) for the question:

How should I display the changed rows?

My first thought is to use a treeview with nodes displaying some
elementary data identifying the rows, which will expand to display all
the changes if the user opens the nodes. However, I can't see what the
user can do to signify that they want to retain (or better, discard) the changes. The simple solution is to click the row to toggle the
retain/discard setting, but left-click is used to open/close the node. I
could use right-click, middle-click or double-click but both seem non-intuitive.

I could put a checkbox image in as a separate column and toggle
retain/discard if the image is clicked and open/close the node if the
click is elsewhere on the row. This seems ok, but I'd prefer it if the retain/discard image were to the left rather than the right of the text.
Is it possible to determine whether the user has clicked on the image or
the text part of a cell? If so, I could display an image to the left of
the text using -image when creating the item and toggle it if it's clicked.

I haven't investigated the possibilities of using the treeview behaviour
of a tablelist. Would this allow me to put the treeview part in the
rightmost column?

I could use a canvas and do everything myself. This seems like an awful
lot of work.

Suggestions, please?

Thanks,
Alan
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From Newsgroup: comp.lang.tcl

Am 01.09.2025 um 14:27 schrieb Alan Grunwald:

I haven't investigated the possibilities of using the treeview behaviour
of a tablelist. Would this allow me to put the treeview part in the rightmost column?

Yes. and it allows to use toggleswitch columns (or checkbuttons) and
does all for you. It is also save for huge data.

Harald
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From Newsgroup: comp.lang.tcl

On 01/09/2025 13:41, Harald Oehlmann wrote:

Am 01.09.2025 um 14:27 schrieb Alan Grunwald:

I haven't investigated the possibilities of using the treeview
behaviour of a tablelist. Would this allow me to put the treeview part
in the rightmost column?

Yes. and it allows to use toggleswitch columns (or checkbuttons) and
does all for you. It is also save for huge data.

Harald

Thanks Harald,

I've gone ahead and three-quarter implimented something with the native treeview and I now think I can use a classic tablelist, without any tree.

Alan
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