[pygtk] On gtk.TreeView expanders and more

[Klaus Müller]

Hey, I've got a couple of questions all somehow related to gtk.TreeViews.

1. I'm looking for a way to replace the expander icon in a gtk.TreeView. 
I've spent countless hours searching stackoverflow, the mailing list, 
the pygtk docs, pydoc and simple trial-and-error without any success. 
The only slightly relevant thing I found was FAQ entry (13.14) where a 
CellRendererPixbuf is added to a gtk.TreeViewColumn and its 
"pixbuf-expander-closed" property is set accordingly. This however just 
adds an image next to the expander which changes based on the state of 
the exander. I'm looking for a way to replace the expander itself.

2. On a related note, how would I go about changing the color of grid 
lines in a treeview? I'd like to change this programatically, not with a 
new entry in my gtrc file since I'd like it theme-independent.

3. Lastly, is there a way to change the effective area of a row in a 
treeview? To elaborate on this question, I have a treeview with a single 
column where I show a filesystem hierarchy based on a gtk.TreeStore. I 
changed the colors of the treeview with a subclassed 
gtk.GenericCellRenderer so that selected rows aren't highlighted 
completely, but rather just the text in the currently selected row has a 
colored background.
Naturally, however, the default behaviour of the CellRenderer is still 
intact which means a row is selected when I click anywhere in the row, 
not just on the text. I'd like to change the area which reacts to 
mouseclicks to the area of the text in the row. I thought about using 
the "clicked" signal of the treeviewcolumn to determine the position of 
the click and do some geometric checks whether the click position was 
atop a row in the treeview, but the information doesn't seem to be 
passed on.

I'm really struggling with these things. They seem to be somewhat 
straight-forward changes (except for the last one maybe), but I can't 
for the life of me find a solution.

Help is really appreciated.
Cheers, Klaus