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#! /usr/bin/env lua
-- vim:sw=4:sts=4
--
-- Demonstrate the use of a gdk_x11_xxx function; not portable to Windows!
-- see also http://www.daa.com.au/pipermail/pygtk/2005-March/009720.html
--
-- Further a method to replace the __index function of GdkWindow's metatable
-- is shown to add an attribute to GdkWindow, as suggested by Michal
-- Kolodziejczyk, similar to the API presented by PyGTK.
--
require "gtk"
function create_window()
local w = gtk.window_new(gtk.WINDOW_TOPLEVEL)
w:show()
-- local xid = gdk.x11_drawable_get_xid(w.window)
local xid = w.window.xid
local lbl = gtk.label_new("This window's XID is " .. xid)
w:add(lbl)
w:set_title("XID example")
w:connect("delete-event", gtk.main_quit)
w:show_all()
end
-- Install a new metatable for GdkWindow. The first function called is used
-- just to obtain an arbitrary GdkWindow to modify its metatable.
function add_window_metatable()
local w = gdk.get_default_root_window()
print(w)
local __MT = getmetatable(gdk.get_default_root_window())
local oldindex = __MT.__index
__MT.__index = function(w, k)
if k == 'xid' then return gdk.x11_drawable_get_xid(w) end
return oldindex(k, v)
end
end
add_window_metatable()
create_window()
create_window()
create_window()
gtk.main()
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