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Versions: 13
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Contents
require 'volt/templates/base_binding'
class IfBinding < BaseBinding
def initialize(target, context, binding_name, branches)
getter, template_name = branches[0]
# puts "New If Binding: #{binding_name}, #{getter.inspect}"
super(target, context, binding_name)
@branches = []
@listeners = []
branches.each do |branch|
getter, template_name = branch
if getter.present?
# Lookup the value
value = value_from_getter(getter)
if value.reactive?
# Trigger change when value changes
@listeners << value.on('changed') { update }
end
else
# A nil value means this is an unconditional else branch, it
# should always be true
value = true
end
@branches << [value, template_name]
end
update
end
def update
# Find the true branch
true_template = nil
@branches.each do |branch|
value, template_name = branch
# TODO: A bug in opal requires us to check == true
if value.cur.true? == true
# This branch is currently true
true_template = template_name
break
end
end
# Change out the template only if the true branch has changed.
if @last_true_template != true_template
@last_true_template = true_template
if @template
@template.remove
@template = nil
end
if true_template
@template = TemplateRenderer.new(@target, @context, binding_name, true_template)
end
end
end
def remove
# Remove all listeners on any reactive values
@listeners.each(&:remove)
@template.remove if @template
super
end
end
Version data entries
13 entries across 13 versions & 1 rubygems