* ext/tk/lib : bug fix

* ext/tk/lib/tkextlib/itcl : add [incr Tcl] support
* ext/tk/lib/tkextlib/itk  : add [incr Tk] support
* ext/tk/lib/tkextlib/iwidgets : midway point of [incr Widgets] support
* ext/tk/sample/tkextlib/iwidgets : very simple examples of [incr Widgets]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@6602 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/tk/lib/tkextlib/iwidgets/datefield.rb

@@ -0,0 +1,42 @@
+#
+#  tkextlib/iwidgets/datefield.rb
+#                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
+#
+
+require 'tk'
+require 'tkextlib/iwidgets.rb'
+
+module Tk
+  module Iwidgets
+    class  Datefield < Tk::Iwidgets::Labeledwidget
+    end
+  end
+end
+
+class Tk::Iwidgets::Datefield
+  TkCommandNames = ['::iwidgets::datefield'.freeze].freeze
+  WidgetClassName = 'Datefield'.freeze
+  WidgetClassNames[WidgetClassName] = self
+
+  def get_string
+    tk_call(@path, 'get', '-string')
+  end
+  alias get get_string
+
+  def get_clicks
+    number(tk_call(@path, 'get', '-clicks'))
+  end
+
+  def valid?
+    bool(tk_call(@path, 'isvalid'))
+  end
+
+  def show(date)
+    tk_call(@path, 'show', date)
+    self
+  end
+  def show_now
+    tk_call(@path, 'show', 'now')
+    self
+  end
+end