Re: Finding the column index for a Gtk::TreeViewColumn from a Gtk::TreeView

[Grincha <3rdshift comcast net>]

have you considered a table?

-Vlad

On Mon, 2006-04-24 at 00:18 +0100, Alex Buell wrote:
> On Sun, 23 Apr 2006 19:24:33 +0200 Murray Cumming <murrayc murrayc com>
> waved a wand and this message magically appeared:
> 
> > On Sun, 2006-04-23 at 13:12 -0400, Paul Davis wrote:
> > > On Fri, 2006-04-21 at 20:15 +0100, Alex Buell wrote:
> > > > Does anyone knows how I can find the column index for a given
> > > > Gtk::TreeViewColumn from a Gtk::TreeView object? Thanks!
> > > 
> > > if you are talking about doing this from (for example) a button
> > > event handler then suprisingly enough, you can't. the tutorial on
> > > the treeview mentions this deficiency, which i find hard to
> > > believe. i use the solution of using the set_data() method to store
> > > a column index at construction time and get_data() to fetch it in
> > > the event handler. it seems crude and i think that GTK+ should do
> > > better on this one.
> > 
> > I guess you could iterate through the TreeViewColumns and do a pointer
> > comparison, to discover the view model index.
> 
> Right I see. Perhaps I've been going about it in the wrong way. I am
> writing a Sudoku application in gtkmm. I need to display a grid of 9x9
> digits,  I use a TreeView model for that, but doesn't seem to work very
> well at all. 
> 
> I wonder if any of you have ideas on how I can properly implement a 9x9
> grid with digits in it (always 1 to 9). 
> 
> I currently define an array of nine integers per row like so:
> 
>         class ModelColumns : public Gtk::TreeModel::ColumnRecord
>         {
>         public:
>                 Gtk::TreeModelColumn<int> m_Item[9];
> 
>                 ModelColumns()
>                 {
>                         for (int i = 0; i < 9; i++)
>                                 add(m_Item[i]);
>                 }
>         };
> 
>         ModelColumns m_Columns;
> 
> Then I just append nine rows of that to the TreeView. Doing this way
> seems a bit tricky and that was why I needed to get the column
> index. Now it seems to me that using arrays probably isn't the right way
> because we don't know which column it is when my custom editable cell
> validation routines are called. Trying to implement a helper routine to
> get the column index only resulted in wierd things happening such as
> having an entire column filled with the same number that I'd entered in
> a cell in the same column!! ;)
> 
> Here's my helper routine:
> int SudokuCreater::get_column_number()
> {
>         Gtk::TreePath Path;
>         Gtk::TreeViewColumn *Column;
>         m_TreeView.get_cursor(Path, Column);
>         Glib::ListHandle<Gtk::TreeViewColumn*> Columns =
> m_TreeView.get_columns();
> 
>         int num = 0;
> 
>         Glib::ListHandle<Gtk::TreeViewColumn*>::const_iterator i =
> Columns.begin(); 
> 	do 
> 	{ 
> 		if (*i == Column)
>                         break;
> 
>                 num++, i++;
>         }
>         while (i != Columns.end());
> 
>         return num;
> }
> 
> I'd be grateful for ideas on the best approach to use. Some of my
> code is downright UGLY!
>