Small updates of samples

samples/gtkclipboard.lua

@@ -4,7 +4,7 @@
 -- http://live.gnome.org/Vala/GTKSample#Clipboard
 
 local lgi = require 'lgi'
-local Gtk = lgi.Gtk
+local Gtk = lgi.require('Gtk', '3.0')
 local Gdk = lgi.Gdk
 
 local app = Gtk.Application { application_id = 'org.lgi.samples.gtkclipboard' }

samples/gtkconsole.lua

@@ -7,8 +7,8 @@
 --
 
 local lgi = require 'lgi'
-local Gtk = lgi.Gtk
-local Vte = lgi.Vte
+local Gtk = lgi.require('Gtk', '3.0')
+local Vte = lgi.require('Vte', '2.90')
 
 -- Simple readline implementation with asynchronous interface.
 local ReadLine = {}

samples/gtkpad.lua

@@ -11,16 +11,19 @@
 --]]--------------------------------------------------------------------------
 
 local lgi = require 'lgi'
-local Gtk = lgi.Gtk
+local Gtk = lgi.require('Gtk', '3.0')
 local Gio = lgi.Gio
 
-local function new_editor(app, file)
+local app = Gtk.Application.new('org.lgi.GtkPad',
+				Gio.ApplicationFlags.HANDLES_OPEN)
+
+function app:new_editor(file)
    local contents = file and file:load_contents()
    local window = Gtk.Window {
       type = Gtk.WindowType.TOPLEVEL,
       default_width = 400,
       default_height = 300,
-      application = app,
+      application = self,
       title = file and file:get_parse_name() or '<Untitled>',
       child = Gtk.ScrolledWindow {
 	 child = Gtk.TextView {
@@ -34,15 +37,12 @@ local function new_editor(app, file)
    return window
 end
 
-local app = Gtk.Application.new('org.lgi.GtkPad', 
-				Gio.ApplicationFlags.HANDLES_OPEN)
-
 function app:on_activate()
-   new_editor(self)
+   self:new_editor()
 end
 
 function app:on_open(files)
-   for i = 1, #files do new_editor(self, files[i]) end
+   for i = 1, #files do self:new_editor(files[i]) end
 end
 
 return app:run {arg[0], ...}