Changes in GtkAssistant

[Sébastien Granjoux <seb sfo free fr>]

Hi all,


Some changes in GtkAssistant done in Gtk 3.1.4 have broken Anjuta new 
project creation wizard. I haven't seen it before because I don't check 
it with the latest version of Gtk.

This wizard is composed of a starting page, several properties pages, a 
final page, a progress page and an error page.

The properties pages are created dynamically depending on the user 
answers on the previous page (the starting page or a previous properties 
page).
Each properties page is generated by an external program so after each 
properties page, the progress page is displayed. When the new page is 
generated, the wizard automatically switch to this new properties page 
or the final page if no more informations are needed.
If the user answers are wrong, the special error page is displayed. It 
could be a warning or an error. In this last case, the continue button 
is disabled.


Currently, the starting page, the error page, the progress page and the 
final page are created at the beginning and the properties pages are 
appended as needed. I'm using a custom page forwarding function to 
define the page order by example: starting (0), progress (1), properties 
1 (4), progress (1), properties 2 (4), progress (1), final (3).

I have a special handler for the "prepare" signal. Basically if I need 
to "prepare" a progress page, it means that the user has filled the 
previous page. I'm checking the previous page eventually displaying the 
error page else I'm starting the generation of the new properties page.


I still have the following issues:

1. I cannot change the current page in the "prepare" signal handler 
anymore (needed in case of an error by example). It's due to this code:

static void
set_current_page (GtkAssistant *assistant,
                  gint          page_num)
{
   GtkAssistantPrivate *priv = assistant->priv;
   priv->current_page = (GtkAssistantPage *)g_list_nth_data 
(priv->pages, page_num);
   g_signal_emit (assistant, signals [PREPARE], 0, 
priv->current_page->page);
   update_title_state (assistant);
   gtk_notebook_set_current_page (GTK_NOTEBOOK (priv->content), page_num);

The handler will change correctly the current page but then it will 
return in the initial set_current_page function that will set the 
notebook page back to the initial page.

I can still do it by delaying the change of the current page from the 
"prepare" signal handler to an idle function handler but it's not so 
handy. Is it allowed to change the current page in the "prepare" signal 
handler? Or is there a better way to achieve this?


2. The progress and error page are not important for the user. Most of 
the time, he will complete the project wizard without seeing the error 
page by example. Is there a way to hide these pages from the left pane?

I could hide the corresponding widget but I don't think it will make a 
difference currently or should I do something else?
I can really remove and add the page when needed but the previous 
GtkAssistant object was not working when doing this. I have tried a bit 
with the new one and it needs quite some changes in my code so I would 
like to be sure that it's the way to go.


3. The final page is displayed before the properties pages which is a 
bit strange. I could reorder them but it's more work. It is possible to 
define a custom "forwarding" function. But Is there a plan to define a 
custom order here too?

I can fix this by inserting the properties page just before the final 
page, so it's probably the smallest issue.


Regards,

Sébastien