[GNC-dev] gnc-currency-edit and entry completion

John Ralls jralls at ceridwen.us
Thu Sep 10 18:23:11 EDT 2020

> On Sep 10, 2020, at 1:37 PM, Dean Jagels <dpj-gcash at mhtsa.us> wrote:
> To get myself oriented with the code and my development setup, I decided I'd look at bug 102787 (https://bugs.gnucash.org/show_bug.cgi?id=102787).
> It turns out that gnc-currency-edit has everything needed underneath it.  However, it short-circuits the machinery.  It listens for a "changed" signal, which fires as soon as the user types into the combo box.  The handler (gnc_currency_edit_active_changed()) calls gnc_currency_edit_get_currency() expecting the currency selection to be complete.  However, in that routine, gtk_combo_box_get_active_iter() returns "false", so gnc_currency_edit_get_currency() returns the locale default currency, gnc_currency_edit_active_changed() pushes the locale default's mnemonic into the combo box, and GTK entry completion never has a chance to offer options.
> If instead, gnc_currency_edit_get_currency() returns NULL and gnc_currency_edit_active_changed() simply returns if it gets NULL, then the entry completion goes ahead and works.
> I see roughly 15 references to gnc_currency_edit_get_currency(). I haven't visited each to teach them how to deal with a NULL return from that function, so I don't have a patch set yet. Before doing so, I wanted to check that others agree with this change.

Some other uses of gnc_currency_edit_get_currency() check gtk_combo_box_get_active() != -1 first to make sure that there's an active selection. Doing so in gnc_currency_edit_active_changed() would be less invasive and save you having to figure out how to correctly handle a NULL currency* in the other 14 uses of gnc_currency_edit_get_currency().

John Ralls


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