From: Joe Van Dyk <joevandyk@...>
Date: 2006-01-04T02:56:39+09:00
Subject: Re: mouse coordinates in a gnome2 canvas

On 1/3/06, Tool69 <kibleur.christophe@gmail.com> wrote:
> Hi,
> I want to show the mouse coordinates inside a label in a gnome2
> application if my mouse is on a canvas. How to procede ? I' ve found no
> documentation on the canvas on ruby gnome2 API. rbbr is not working on
> my ubuntu (no description at all), so you're my last chance...
> In fact, it's not really a canvas problem but more a gtk one. I've
> tried something like :
>
> @ecran = Gdk::Display.default
> canvas.signal_connect("event") do
>     pos = @ecran.window_at_pointer
>     @label1.set_text("x=#{pos[1]}")
>     @label2.set_text("y=#{pos[2]}")
> end
>
> ....but then all my drawings disappear.

require 'gnomecanvas2'

Gtk.init

window = Gtk::Window.new "Mouse Coordinate display"
window.set_default_size 300, 300
grid = Gtk::VBox.new
window << grid

canvas = Gnome::Canvas.new
grid.pack_start canvas

coord_label = Gtk::Label.new "sup"
grid.pack_start coord_label, false

window.show_all

window.signal_connect("destroy") { Gtk::main_quit }

canvas.signal_connect("motion-notify-event") do |widget, event|
  x = event.x
  y = event.y
  coord_label.text = "X Pos: #{ x }, Y Pos: #{ y }"
end

Gtk::main