On Wednesday 09 February 2005 13:56, Ken Siersma wrote:
> I want to specify a number of rows to always display in my
> GtkTreeView widget, regardless of how many entities are in my
> GtkListStore. I'm using the GtkTreeView to display a list of files.
> Sometimes there are no files, sometimes there are 100 files. I want my
> GtkTreeView to always display 15 rows.
>
> I'm porting code from Motif, and Motif can do this simply by specifying
> the XmNvisibleItemCount property for it's list widget. I'm looking for
> a simple way to do this in GTK as well. I've looked through the API,
> but it didn't seem like there were any simple solutions like this.
There isn't really anything as simple as a property. If your rows are all the
same height, however, you can probably do this in a hackish way, e.g. by
estimating the height of one row, and then multiplying that height with the
number of rows you want to be visible, and then call
gtk_widget_set_size_request (treeview, -1, height)
The tricky thing is to find out the height of a row of course. If you display
simple one-line strings or markup, you could do something along these lines:
guint
simple_estimate_row_height (GtkTreeView *tv)
{
GtkCellRendererText *cell;
PangoLayout *layout;
guint row_height, ypad;
layout = gtk_widget_create_pango_layout (tv, NULL);
pango_layout_set_markup (layout, "<i>red fox jumps bla</i>", -1);
pango_layout_get_pixel_extents (layout, NULL, &row_height);
cell = gtk_cell_renderer_new_text ();
g_object_get (cell, "ypad", &ypad, NULL);
g_object_unref (cell);
g_object_unref (layout);
return row_height + 2*ypad;
}
I'm sure there are more accurate and less hackish ways, but this might just do
anyway. If your treeview is in a scrolled window, you may have to take into
account the height of the horizontal scroll bar as well (if it's not set to
be invisible).
Cheers
-Tim
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