Class: Glimmer::DSL::Opal::DataBindingExpression

Inherits:
Expression
  • Object
show all
Defined in:
lib/glimmer/dsl/opal/data_binding_expression.rb

Overview

Responsible for wiring two-way data-binding for text and selection properties on Text, Button, and Spinner elements. Does so by using the output of the bind(model, property) command in the form of a ModelBinding, which is then connected to an anonymous element observer (aka element_data_binder as per element_data_binders array)

Depends on BindCommandHandler

Instance Method Summary collapse

Instance Method Details

#can_interpret?(parent, keyword, *args, &block) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/glimmer/dsl/opal/data_binding_expression.rb', line 16

def can_interpret?(parent, keyword, *args, &block)
  args.size == 1 and
    args[0].is_a?(DataBinding::ModelBinding)
end

#interpret(parent, keyword, *args, &block) ⇒ Object 



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# File 'lib/glimmer/dsl/opal/data_binding_expression.rb', line 21

def interpret(parent, keyword, *args, &block)
  model_binding = args[0]
  element_binding_parameters = [parent, keyword]
  element_binding = DataBinding::ElementBinding.new(*element_binding_parameters)
  element_binding.call(model_binding.evaluate_property)
  #TODO make this options observer dependent and all similar observers in element specific data binding handlers
  element_binding.observe(model_binding)
  # TODO simplify this logic and put it where it belongs
  parent.add_observer(model_binding, keyword) if parent.respond_to?(:add_observer)
end