Forum: Ruby-Gnome 2 how to change the rendering in a cell of a treeview in gtk2

Hi, I am just starting to use gtk2 library. I have a problem which I
think should be a simple one but I cannot find an answer with google or
checking the doc. What I want is change the rendering (like making it
insensitive) of certain cells or rows in an established treeview with a
check button. The button sits beside the treeview.

what I tried is adding some extra lines into the
"col.set_cell_data_func(renderer)" function which run at the treeview
initialization. I want to make certain cells insensitive. What I got is
that certain cells will only become insensitive when the cursor was
moved onto the cell. This is not what I want. The effect I want is
certain rows or cells become insensitive immediately when I click on the
check button.

I guess I am doing it the wrong way. Any suggestions?

Thanks in advance.

Hi:

If I understand your question, you have a single checkbox (not a column
in the treeview) that when you check it you want the treeview to repaint
so that certain cells are insensitive?

The way to do this is you write a handler for the checkboxes "toggled"
method that repaints the treeview:


In visualruby:

def checkbox__toggled(*args)
  # make cells insensitive here
  @builder["scrolledwindow1"].hide  # repaint treeview
  @builder["window1"].show_all
end

If you're using gtk directly:

checkbox.signal_connect("toggled") { |x,y| checkbox__toggled(x,y) }

(something like that?!?!?)

Hope it helps,
Eric
visualruby.net

Hi Eric,

thanks a lot for your explanation.

I am using gtk2. And I has been using the

checkbox.signal_connect("toggled"){}

method as you explained. But I do not know how to repaint the tree view. 
To be specific, I already have this @treeview object. How do I render 
again certain rows? Is it possible to get the handle of renderers of 
certain rows or columns from the @treeview object so that I can set 
renderer.sensitive to false?

Or should I create a new renderer and couple it with the @treeview?

Peng