Re: Treeview doesnt refresh upon reopenning window

[JAMES SCOTT <skoona verizon net>]

----- Original Message ----
From: Jason Brisbane <darkeen westnet com au>
To: JAMES SCOTT <skoona verizon net>
Sent: Monday, April 23, 2007 11:12:49 AM
Subject: Re: Treeview doesnt refresh upon reopenning window

HI,

Just a few issues I have been having with that:

- gtk_widget_destroy doesnt have a return value and another 
lookup_widget to check if it exists would generate an error.

Comment: lookup_widget() returns a value or null. its this value that's sometimes null and causing the error. 
 consider:
...
GtkWidget *widget = NULL;
...
widget = lookup_widget(widget, "treeview4");
if () {
    gtk_widget_destroy(widget);
}
...

- Every version of a treeview (from the internet, the GTK devhelp, etc) 
I have found says that the liststore cannot be accessed after it is used 
to create the model/view. If anyone can let me know how to access a 
liststore after the listview is populated with data (ie how to access 
the colums/rows and data therein) I'd change my approach.
Comment:  These are advanced examples but look at the code in http://GapcMon.Sourceforge.net/ and 
http://gfhcm.sourceforge.net/  In them one or more treeviews are created and continually updated.  Here are 
documentation links which may shed more light:   GTK+2.0 Tutorial http://scentric.net/tutorial/

- the liststore is created when the window is shown and the window's 
other process can all access the treeview access points and get the data 
therein. The liststore however, I cannot access for love nor money.

Comment:  This will return ptr to the associated liststore.
 GtkTreeModel *gtk_tree_view_get_model(GtkTreeView *tree_view);Then with the 
gtk_tree_store_{set,remore,insert, insert_before,insert_after,prepend,append} api you can do everything 
except 'get' a record; use gtk_tree_model_get() to do that.


- I'll always know when the database changes - every time I want to 
issue the _show command. I could create another function called 
"repopulate_treeview" but since the _show is going to do the exact same 
thing, at the exact same time, it seemed pointless.
Comment: That would work; Just don't destroy and recreate it everytime.  Keep a ptr to the treeview and use 
that ptr to rediscovery the liststore for update operations.  If you change the liststore the treeview will 
automatically refresh.

-Also, since the database will be sorted on its fields, I dont want to 
have to make the program do any sorting. Thus all I need to do is grab 
the result_set and repopulate the liststore from the top down with each 
row, which will be presorted. Plus the list will only have approx 30 
rows in it.
Comment:  You can enable the treeview headers to be selectable -- causing a dynamic column sort; plus a 
treeview can apply a default sort which you control.

If anyone can point me in the direction of how to re-write the program 
to show the treeview's data then I'd be a very happy man!

Comment: Look at my apps and others; read the tutorial, and I hope your using "DevHelp" and documentation app 
installed by default on most distributions; fedora "yum install devhelp". 

The only issue you may run into is Glade related; I don't know glade well, so someone else will need to help 
you if you have glade issues.

Thanks in advance.
<SNIP>

-- 
Regards,

Jason Brisbane