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Contents
module Kadmin
# Base presenter class
class Presenter < SimpleDelegator
# @param [Object] object the object to present
# @param [ActiveView::Base] view the view to present in; can be provided later on
def initialize(object, view: nil)
super(object)
@view = view
end
# Renders the wrapped object into the given view
# @param [ActiveView::Base] view optionally render in a different view
# @param [Hash] options additional options passed to the render method
# @param [Proc] block optional block to render additional stuff within the template
# @return [Object] rendered representation of the wrapped object, typically a string
def render(view: nil, **options, &block)
previous_view = @view
rendered = nil
captured = ''
begin
@view = view unless view.nil?
raise Kadmin::Presenter::NoViewContext if @view.nil?
captured = capture(&block) if block_given?
rendered = generate(captured, **options)
ensure
@view = previous_view
end
return rendered
end
# Updates the context of the presenter with the given view
# This is mostly to provide a consistent interface between
# Presentable and Presenter, so you don't have to check if you should
# present something or not.
# @param [ActiveView::Base] view render in a different view
# @return [self] returns itself, as it is already presented
def present(view)
@view = view
return self
end
protected
# Generates the representation of the wrapped object.
# Should be overloaded and implemented by a concrete class.
def generate(captured, **)
return "<div>#{__getobj__.inspect}#{captured}</div>".html_safe
end
class NoViewContext < Kadmin::Error
def initialize(message = nil)
message ||= 'cannot render without a view context'
super(message)
end
end
end
end
Version data entries
21 entries across 21 versions & 1 rubygems