lib/glimmer/dsl/swt/data_binding_expression.rb
# Copyright (c) 2007-2024 Andy Maleh
#
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# a copy of this software and associated documentation files (the
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# without limitation the rights to use, copy, modify, merge, publish,
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# 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
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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
# Responsible for wiring two-way data-binding for text and selection properties
# on Text, Button, and Spinner widgets.
# 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 widget observer
# (aka widget_data_binder as per widget_data_binders array)
#
# Depends on BindExpression
class DataBindingExpression < Expression
def can_interpret?(parent, keyword, *args, &block)
args.size == 1 and
args[0].is_a?(DataBinding::ModelBinding)
end
def interpret(parent, keyword, *args, &block)
model_binding = args[0]
widget_binding = DataBinding::WidgetBinding.new(parent, keyword, sync_exec: model_binding.binding_options[:sync_exec], async_exec: model_binding.binding_options[:async_exec])
widget_binding.call(model_binding.evaluate_property)
#TODO make this options observer dependent and all similar observers in widget specific data binding handlers
widget_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, [model_binding, keyword])
end
end
end
end
end