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+#!/usr/bin/env ruby
+##
+## valid.rb
+##
+## This demos shows the use of the validation mechanism of the table
+## and uses the table's cache (no -command or -variable)
+##
+## ( based on 'valid.tcl' included source archive of tktable extension )
+##
+require 'tk'
+require 'tkextlib/tktable'
+
+rows = 10
+cols = 10
+
+def colorize(num)
+ num = Integer(num)
+ return 'colored' if (num > 0 && num % 2 == 1)
+end
+
+def fill_headers(w, r=10, c=10)
+ (1..(r-1)).each{|i| w.set([i,0], i.to_s)}
+
+ (1..(c-1)).each{|j|
+ if j % 3 == 1
+ w.set([0,j], 'AlphaNum')
+ elsif j % 2 == 1
+ w.set([0,j], 'Alpha')
+ elsif j != 0
+ w.set([0,j], 'Real')
+ end
+ }
+end
+
+def validate_proc(c, val)
+ if c % 3 == 1
+ # AlphaNum
+ regexp = /^[A-Za-z0-9 ]*$/
+ elsif c % 2 == 1
+ # Alpha
+ regexp = /^[A-Za-z ]*$/
+ elsif c != 0
+ # 'Real'
+ regexp = /^[-+]?[0-9]*\.?[0-9]*([0-9]\.?e[-+]?[0-9]*)?$/
+ end
+ if val =~ regexp
+ return true
+ else
+ Tk.bell
+ return false
+ end
+end
+
+lbl = TkLabel.new(:text=>"TkTable v1 Validated Table Example")
+
+table = Tk::TkTable.new(:rows=>rows, :cols=>cols, :cache=>1,
+ :width=>5, :height=>5, :titlerows=>1, :titlecols=>1,
+ :coltagcommand=>proc{|n| colorize(n)},
+ :flashmode=>true, :selectmode=>:extended,
+ :colstretch=>:unset, :rowstretch=>:unset,
+ :validate=>true,
+ :validatecommand=>proc{|e|
+ unless e.widget.tag_include?('title', e.index)
+ validate_proc(e.column, e.new_value)
+ end } )
+
+fill_headers(table)
+
+table.tag_configure('colored', :bg=>'lightblue')
+table.tag_configure('title', :fg=>'red')
+table.set_width(0,3)
+
+sx = table.xscrollbar(TkScrollbar.new)
+sy = table.yscrollbar(TkScrollbar.new)
+
+btn = TkButton.new(:text=>'Exit', :command=>proc{exit})
+
+Tk.grid(lbl, '-', :sticky=>:ew)
+Tk.grid(table, sy, :sticky=>:news)
+Tk.grid(sx, :sticky=>:ew)
+Tk.grid(btn, '-', :sticky=>:ew)
+
+Tk.root.grid_columnconfig(0, :weight=>1)
+Tk.root.grid_rowconfig(1, :weight=>1)
+
+puts "Table is #{table.path}"
+
+Tk.mainloop