AndyObtiva/glimmer-dsl-swt

# Copyright (c) 2007-2024 Andy Maleh
#
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require 'glimmer/dsl/expression'
require 'glimmer/data_binding/model_binding'
require 'glimmer/data_binding/widget_binding'
require 'glimmer/swt/display_proxy'

module Glimmer
  module DSL
    module SWT
      class RadioGroupSelectionDataBindingExpression < Expression
 
        def can_interpret?(parent, keyword, *args, &block)
          keyword == 'selection' and
            block.nil? and
            (parent.is_a?(Glimmer::SWT::Custom::RadioGroup) or (parent.is_a?(Glimmer::UI::CustomWidget) and parent.body_root.is_a?(Glimmer::SWT::Custom::RadioGroup)) ) and
            args.size == 1 and
            args[0].is_a?(DataBinding::ModelBinding) and
            args[0].evaluate_options_property.is_a?(Array)
        end
  
        def interpret(parent, keyword, *args, &block)
          model_binding = args[0]
  
          #TODO make this options observer dependent and all similar observers in widget specific data binding handlers
          # TODO consider delegating some of this work
          widget_binding = DataBinding::WidgetBinding.new(parent, 'items', sync_exec: model_binding.binding_options[:sync_exec], async_exec: model_binding.binding_options[:async_exec])
          widget_binding.call(model_binding.evaluate_options_property)
          model = model_binding.base_model
          widget_binding.observe(model, model_binding.options_property_name)
  
          widget_binding = DataBinding::WidgetBinding.new(parent, 'selection', sync_exec: model_binding.binding_options[:sync_exec], async_exec: model_binding.binding_options[:async_exec])
          widget_binding.call(model_binding.evaluate_property)
          widget_binding.observe(model_binding)
  
          raise(Glimmer::Error, "No radios found! Make sure radio selection is data-bound to a property having property_options as non-empty array!") if parent.get_items.empty?
          Glimmer::SWT::DisplayProxy.instance.auto_exec(override_sync_exec: model_binding.binding_options[:sync_exec], override_async_exec: model_binding.binding_options[:async_exec]) do
            parent.on_widget_selected do
              model_binding.call(widget_binding.evaluate_property)
            end
          end
        end
      end
    end
  end
end