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nested_layouts
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资源说明：Nested Layouts
= NestedLayouts

Plugin allows to specify outer layouts for particular layout thus creating nested layouts.

== Wrapping layout into another layout

Let's assume you have controller which action 'hello' just was called.
Controller was set up to use 'inner' layout:

  app/controllers/hello_controller.rb

    class HelloController < ApplicationController
      layout 'inner'

      def hello
        render :text => 'Hello, world!'
      end
    end

  app/views/layouts/inner.rhtml

    <% inside_layout 'outer' do -%>
      

        
Greetings

        <%= yield %>
      

    <% end -%>

  app/views/layouts/outer.rhtml

    
    
      

        <%= yield %>
      

    
    

Result will look like this (formatted for better reading):

    
    
      

        

          
Greetings

          Hello, world!
        

      

    
    

== Concept

Concept of layout nesting here is based on the assumption that every
inner layout is used only to _customize_ it's outer layout and thus every
inner layout is used only with one specific outer layout. With this in
mind we can conclude that every layout must know it's outer layout and
thus information about outer layout must be embeded directly into inner
layout. Controller doesn't need to know about the whole stack of layouts,
so you should just specify the most inner layout in it.

== Passing data

You can pass data from inner layout to outer one, e.g.:

  layouts/inner.rhtml

    <% content_for 'menu' do -%>
      
    <% end -%>

    <% inside_layout 'outer' do -%>
      <% @other_data_for_outer_layout = 'foo' -%>
      <%= yield %>
    <% end -%>

  layouts/outer.rhtml

    <%= yield 'menu' %>
    

    The data was: <%= @other_data_for_outer_layout %>
    

    <%= yield %>


== Inline layouts

Instead of using layout stored in file system, you can use
+inside_inline_layout+ to wrap template part into some template
code passed as a string. It is usefull if you want to use
layouts that are stored in DB:

  Layout model

    class Layout < ActiveRecord::Base
      # Has attributes 'name' and 'contents'
    end

  Helper

    module ApplicationHelper
      def inside_db_layout(name, &block)
        layout = Layout.find_by_name(name)
        template = layout ? layout.contents : '<%= yield %>'
        inside_inline_layout(template, &block)
      end
    end

  View

    <% inside_db_layout 'layout_from_db1' do %>
      Content
    <% end %>

== Credits

This plugin was originally written by Maxim Culkin 
(maxim_culkin@gmail.com)

Forked by Jeff Wigal (jeff@referee-assistant.com), patched to be 
compatible with Rails 2.2+

== Download

 ./script/plugin install git://github.com/jwigal/nested_layouts.git

Original project page: 
 http://rubyforge.org/projects/nested-layouts/ 

== Bugs & Feedback

If you encounter any bugs or has some feature proposal, feel free to 
email it to jeff@referee-assistant.com.

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