Class: Glimmer::DataBinding::TreeItemsBinding

Inherits:
Object
  • Object
show all
Includes:
Observable, Observer
Defined in:
lib/glimmer/data_binding/tree_items_binding.rb

Instance Method Summary collapse

Methods included from Observer

#add_dependent, #dependents, #dependents_for, proc, #register, #registration_for, #registrations, #remove_dependent, #unregister, #unregister_all_observables, #unregister_dependents_with_observable

Methods included from Observable

#add_observer, #inspect, #remove_observer

Constructor Details

#initialize(parent, model_binding, tree_properties) ⇒ TreeItemsBinding

Returns a new instance of TreeItemsBinding.



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# File 'lib/glimmer/data_binding/tree_items_binding.rb', line 16

def initialize(parent, model_binding, tree_properties)
  @tree = parent
  @model_binding = model_binding
  @tree_properties = [tree_properties].flatten.first.to_h
  if @tree.respond_to?(:tree_properties=)
    @tree.tree_properties = @tree_properties
  else # assume custom widget
    @tree.body_root.tree_properties = @tree_properties
  end
  call
  model = model_binding.base_model
  observe(model, model_binding.property_name_expression)
  @tree.on_widget_disposed do |dispose_event|
    unregister_all_observables
  end
end

Instance Method Details

#call(new_value = nil) ⇒ Object 



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# File 'lib/glimmer/data_binding/tree_items_binding.rb', line 33

def call(new_value=nil)
  @model_tree_root_node = @model_binding.evaluate_property
  populate_tree(@model_tree_root_node, @tree, @tree_properties)
end

#populate_tree(model_tree_root_node, parent, tree_properties) ⇒ Object 



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# File 'lib/glimmer/data_binding/tree_items_binding.rb', line 38

def populate_tree(model_tree_root_node, parent, tree_properties)
  # TODO make it change things by delta instead of removing all
  selected_tree_item_model = parent.swt_widget.getSelection.map(&:getData).first
  old_tree_items = parent.all_tree_items
  old_tree_item_expansion_by_data = old_tree_items.reduce({}) {|hash, ti| hash.merge(ti.getData => ti.getExpanded)}
  old_tree_items.each do |tree_item|
    tree_item.getData('observer_registrations').each do |key, observer_registration|
      observer_registration.unregister
    end          
  end        
  parent.swt_widget.removeAll
  populate_tree_node(model_tree_root_node, parent.swt_widget, tree_properties)
  parent.all_tree_items.each { |ti| ti.setExpanded(!!old_tree_item_expansion_by_data[ti.getData]) }
  tree_item_to_select = parent.depth_first_search {|ti| ti.getData == selected_tree_item_model}
  parent.swt_widget.setSelection(tree_item_to_select)
end

#populate_tree_node(model_tree_node, parent, tree_properties) ⇒ Object 



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# File 'lib/glimmer/data_binding/tree_items_binding.rb', line 55

def populate_tree_node(model_tree_node, parent, tree_properties)
  return if model_tree_node.nil?
  # TODO anticipate default tree properties if none were passed (like literal values text and children)
  tree_item = TreeItem.new(parent, SWT::SWTProxy[:none])
  observer_registrations = @tree_properties.reduce({}) do |hash, key_value_pair|
    hash.merge(key_value_pair.first => observe(model_tree_node, key_value_pair.last))
  end
  tree_item.setData('observer_registrations', observer_registrations)
  tree_item.setData(model_tree_node)
  tree_item.setText((model_tree_node && model_tree_node.send(tree_properties[:text])).to_s)
  [model_tree_node && model_tree_node.send(tree_properties[:children])].flatten.to_a.compact.each do |child|
    populate_tree_node(child, tree_item, tree_properties)
  end
end