Re: [TCLCORE] [Ext] Re: [Pre-CFV] - RFQ - TIP 541: ttk::combobox current

> -----Ursprüngliche Nachricht-----> Von: François Vogel [mailto:fvog...@free.fr]> Gesendet: Dienstag, 14. Mai 2019 14:29> An: Donald Arseneau <a...@triumf.ca>> Cc: tcl-...@lists.sourceforge.net> Betreff: [Ext] Re: [TCLCORE] [Pre-CFV] - RFQ - TIP 541: ttk::combobox current>>> ----- Mail original -----> De: "Donald Arseneau" <a...@triumf.ca>> À: tcl-...@lists.sourceforge.net> Envoyé: Mardi 14 Mai 2019 07:52:00> Objet: [TCLCORE] [Pre-CFV] - RFQ - TIP 541: ttk::combobox current>> > Was there thought put to making this ("end" index for ttk::combobox)> > truly symmetric with list indices, where "end-1" etc are also> > supported? It would be great if the internals were shared, to reduce future> divergence.>> This is actually a good question. Short answer is no, I didn't think about this so> far. But now I just did and here is what I can say about this idea.>> In Tcl, support for indices of the type "M+N", "M-N", "end-N", "end+N" was> added by TIP #176. TclGetIntForIndex was enhanced to support this syntax,> and the lists operations took advantage of it.>> In Tk, unless I missed something, no widget supports this syntax. At least> entry, spinbox, listbox, ttk:entry, ttk::spinbox, ttk::combobox do not. The> text widget neither supports this, however there are indices modifiers that> provide this feature but the programmer needs to specify the "unit" (chars,> lines, display lines...) of the offset. It's not just "end-3" for instance.> Moreover, spaces before or after the +/- sign are supported by the text> widget, which is not the case for list index arithmetic.>> Now taking advantage of TclGetIntForIndex() in Tk could be done, and then> we would propagate this to all Tk areas where it's useful (that is entry,> spinbox, listbox, ttk:entry, ttk::spinbox, ttk::combobox). Given that a. no> existing Tk widget already has this, b. we can do it later without breaking> compatibility and c. it's a quite larger project than what TIP #541 is targeting, I> suggest this to be the subject of another TIP. Also I believe this would mean> promoting TclGetIntForIndex() to the public interface as> Tcl_GetIntForIndex(), and then document it.>

Thank you for the detailed analysis!

Now my question:

Why do you feel the need to do the change in ttk::combobox now and not the change in all of tk?
The original ticket was from 2009.

Thank you
rene



Kernkraftwerk Goesgen-Daeniken AG
CH-4658 Daeniken, Switzerland

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