hello_list_single_selection.rb

# Copyright (c) 2020-2022 Andy Maleh
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

require 'glimmer-dsl-tk'

class Person
  attr_accessor :country, :country_options

  def initialize
    self.country_options=["", "Canada", "US", "Mexico"]
    self.country = "Canada"
  end

  def reset_country
    self.country = "Canada"
  end
end

class HelloListSingleSelection
  include Glimmer
  
  def launch
    person = Person.new
    
    root {
      title 'Hello, List Single Selection!'
      
      list {
        selectmode 'browse'
        selection <=> [person, :country]
      }
      
      button {
        text "Reset Selection To Default Value"
        
        command { person.reset_country }
      }
    }.open
  end
end

HelloListSingleSelection.new.launch