site_widget_with_content_defined.rb

class SiteWidget < Erector::Widget
  class << self
    def tag(name, value=nil, &implentation)
      raise(ArgumentError, "You cannot have both a value and an implentation") if value && implentation
      if implentation
        define_method(name, &implentation)
      else
        define_method(name) {value}
      end
    end
  end

  def content
    html do
      head do
        title
      end

      body do
        div :class => :header do
          h1 title_text
        end

        div :class => :navigation do
        end

        article
      end
    end
  end
  alias_method :render, :content

  def title
    element(:title, title_text)
  end
  tag :title_text, ""

  def article
    div(:class => :article) {article_content}
  end
  tag :article_content, ""
end

site_widget_with_write_defined.rb

class SiteWidget < Erector::Widget
  class << self
    def tag(name, value=nil, &implentation)
      raise(ArgumentError, "You cannot have both a value and an implentation") if value && implentation
      if implentation
        define_method(name, &implentation)
      else
        define_method(name) {value}
      end
    end
  end

  def write
    html do
      head do
        title
      end

      body do
        div :class => :header do
          h1 title_text
        end

        div :class => :navigation do
        end

        article
      end
    end
  end
  alias_method :render, :write

  def title
    element(:title, title_text)
  end
  tag :title_text, ""

  def article
    div(:class => :article) {article_content}
  end
  tag :article_content, ""
end