Contents

require 'glimmer/dsl/expression'
require 'glimmer/swt/display_proxy'

module Glimmer
  module DSL
    module SWT
      class WidgetListenerExpression < Expression
        include_package 'org.eclipse.swt.widgets'
  
        def can_interpret?(parent, keyword, *args, &block)
          Glimmer.logger&.debug "keyword starts with on_: #{keyword.start_with?('on_')}"
          return false unless keyword.start_with?('on_')
          widget_or_display_parentage = widget?(parent) || parent.is_a?(Glimmer::SWT::DisplayProxy)
          Glimmer.logger&.debug "parent is a widget or display: #{widget_or_display_parentage}"
          return false unless widget_or_display_parentage
          Glimmer.logger&.debug "block exists?: #{!block.nil?}"
          raise Glimmer::Error, "Listener is missing block for keyword: #{keyword}" unless block_given?
          Glimmer.logger&.debug "args are empty?: #{args.empty?}"
          raise Glimmer::Error, "Invalid listener arguments for keyword: #{keyword}(#{args})" unless args.empty?
          result = parent.can_handle_observation_request?(keyword)
          Glimmer.logger&.debug "can add listener? #{result}"
          raise Glimmer::Error, "Invalid listener keyword: #{keyword}" unless result
          true
        end
  
        def interpret(parent, keyword, *args, &block)
          parent.handle_observation_request(keyword, &block)
        end
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
glimmer-0.6.0	lib/glimmer/dsl/swt/widget_listener_expression.rb