From: Daniel Carrera <dcarrera@...>
Date: 2003-02-23T06:18:23+09:00
Subject: Re: [Q] TreeView in Ruby-Gnome2

On Sun, Feb 23, 2003 at 01:51:32AM +0900, Masao Mutoh wrote:

> > A couple of questions:
> > 
> > 1) When the user clicks on an entry in a TreeView widget, how can I find 
> > out which entry was clicked?
> > ----------------------
> > def callback(widget, event)
> >     # Use 'event' to find which line was clicked?
> > end
> > 
> > tree_view.signal_connect("button_press_event") {|w, e| callback(w, e)}
> 
> 1. Use Gtk::TreeView's "cursor-changed" signal.
>    tree_view.signal_connect("cursor-changed") do ... end
> 
> 2. Use Gtk::TreeSelection's "changed" signal.
>    tree_view.selection.signal_connect("changed") do ... end
> 
> > 2) How come TreeView does not have a "clicked" signal like buttons?
> 
> I couldn't understand this sentence because of my poor english.
> What's different from your 1st question?

1) The first question was not asking which signal I could use.  I already 
know that "button_press_event" works.  I want to know which entry was 
clicked.  Here is an example:

Suppose that I make a tree with the entries "Jeffrey", "Melissa" and 
"Sandy".  I want to know whether the user clicked on "Jeffrey" or whether 
he clicked on "Melissa" or "Sandy".

1.b) What does Gtk::TreeSelection's "changed" signal do?

2) In the second question, I point out that:

my_button.singal_connect("clicked") { ... }  # Works
tree_view.signal_connect("clicked") { ... }  # Does not work.

I was just wondering why.

Thanks for your help.  I appreciate it very much.

-- 
Daniel Carrera
Graduate Teaching Assistant.  Math Dept.
University of Maryland.  (301) 405-5137