Re: Scrolling a Tree View before it's realized

[Attilio Fiandrotti <attilio fiandrotti gmail com>]

Attilio Fiandrotti wrote:
> Hi
>
> In an application i add many items to a ListStore and make it scroll on 
> the fly to the default option row,  like this
>
> for (i = 0; i < NUMBER_OF_ITEMS; i++) {
>      gtk_list_store_append (store, &iter);
>      gtk_list_store_set (store, &iter, MY_COLUMN, mystrings[i], -1);
>      if (default_option_index == i) {
>          path = gtk_tree_model_get_path(model, &iter);
>          gtk_tree_view_scroll_to_cell (GTK_TREE_VIEW(view), path, NULL, 
> FALSE, 0.5, 0);
>          gtk_tree_view_set_cursor (GTK_TREE_VIEW(view), path, NULL, FALSE);
>          gtk_tree_path_free (path);
>      }
> }
>
> Later i pack the TreeView into proper box hierarchy and eventually show 
> the gtkwindow and within contained widgets.
>
> Now, scrolling works inconsistently, as the row gets indeed selected but 
> the scrolling is only "partial".
> I wonder if this is because i'm attempting to scroll to a row in a 
> treeview which has not been realized yet.
> In the case, does performing scroll after widget realization, from 
> within a proper callback, will solve this issue?

I eventually managed this by scrolling the treeview from a callback that 
gets fired after the expose event is fired.
In order to have scrolling performed only the first time expose event is 
fired, i use a global flag which i reset from inside the callback the 
first time it's run.
I now would like to know if there is a way to run a signal handler only 
once and without using a second signal handler or global flags.

thanks

Attilio