Class: Blocks::Base

Inherits:
Object
  • Object
show all
Includes:
CallWithParams
Defined in:
lib/blocks/base.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#anonymous_block_number ⇒ Object

counter, used to give unnamed blocks a unique name



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# File 'lib/blocks/base.rb', line 12

def anonymous_block_number
  @anonymous_block_number
end

#blocks ⇒ Object

Hash of block names to Blocks::Container objects



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# File 'lib/blocks/base.rb', line 9

def blocks
  @blocks
end

#global_options ⇒ Object

These are the options that are passed into the initalize method



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# File 'lib/blocks/base.rb', line 15

def global_options
  @global_options
end

#surrounding_tag_surrounds_before_and_after_blocks ⇒ Object

Boolean variable for whether Blocks should render before and after blocks inside or outside of a collections’ elements’ surrounding tags



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# File 'lib/blocks/base.rb', line 27

def surrounding_tag_surrounds_before_and_after_blocks
  @surrounding_tag_surrounds_before_and_after_blocks
end

#template_folder ⇒ Object

The default folder to look in for global partials



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# File 'lib/blocks/base.rb', line 18

def template_folder
  @template_folder
end

#use_partials ⇒ Object

Boolean variable for whether Blocks should attempt to render blocks as partials if a defined block cannot be found



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# File 'lib/blocks/base.rb', line 24

def use_partials
  @use_partials
end

#variable ⇒ Object

The variable to use when rendering the partial for the templating feature (by default, “blocks”)



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# File 'lib/blocks/base.rb', line 21

def variable
  @variable
end

#view ⇒ Object

a pointer to the ActionView that called Blocks



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# File 'lib/blocks/base.rb', line 6

def view
  @view
end

Instance Method Details

#after(name, options = {}, &block) ⇒ Object Also known as: append, for

Add a block to render after another block. This after block will be put into an array so that multiple

after blocks may be queued. They will render in the order in which they are declared when the
"blocks#render" method is called. Any options specified to the after block will override any options
specified in the block definition.
 <% blocks.define :wizard, :option1 => 1, :option2 => 2 do |options| %>
   Step 2 (:option1 => <%= options[option1] %>, :option2 => <%= options[option2] %>)<br />
 <% end %>

 <% blocks.after :wizard, :option1 => 3 do
   Step 3 (:option1 => <%= options[option1] %>, :option2 => <%= options[option2] %>)<br />
 <% end %>

 <% blocks.after :wizard, :option2 => 4 do
   Step 4 (:option1 => <%= options[option1] %>, :option2 => <%= options[option2] %>)<br />
 <% end %>

 <%= blocks.render :wizard %>

 <!-- Will render:
   Step 2 (:option1 => 1, :option2 => 2)<br />
   Step 3 (:option1 => 3, :option2 => 2)<br />
   Step 4 (:option1 => 1, :option2 => 4)<br />
 -->

 <%= blocks.render :wizard, :step => @step %>

Options:

name

The name of the block to render this code after when that block is rendered

options

Any options to specify to the after block when it renders. These will override any options specified when the block was defined.

block

The block of code to render after another block



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# File 'lib/blocks/base.rb', line 346

def after(name, options={}, &block)
  self.add_block_container_to_list("after_#{name.to_s}", options, &block)
  nil
end

#around(name, options = {}, &block) ⇒ Object

Add a block to render around another block. This around block will be put into an array so that multiple

around blocks may be queued. They will render in the order in which they are declared when the
"blocks#render" method is called, with the last declared around block being rendered as the outer-most code, and
the first declared around block rendered as the inner-most code. Any options specified to the after block will override any options
specified in the block definition. The user of an around block must declare a block with at least one parameter and
should invoke the #call method on that argument.

 <% blocks.define :my_block do %>
   test
 <% end %>

 <% blocks.around :my_block do |content_block| %>
   <h1>
     <%= content_block.call %>
   </h1>
 <% end %>

 <% blocks.around :my_block do |content_block| %>
   <span style="color:red">
     <%= content_block.call %>
   </span>
 <% end %>

 <%= blocks.render :my_block %>

 <!-- Will render:
 <h1>
   <span style="color:red">
     test
   </span>
 </h1>

Options:

name

The name of the block to render this code around when that block is rendered

options

Any options to specify to the around block when it renders. These will override any options specified when the block was defined.

block

The block of code to render after another block



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# File 'lib/blocks/base.rb', line 393

def around(name, options={}, &block)
  self.add_block_container_to_list("around_#{name.to_s}", options, &block)
  nil
end

#before(name, options = {}, &block) ⇒ Object Also known as: prepend

Add a block to render before another block. This before block will be put into an array so that multiple

before blocks may be queued. They will render in the order in which they are declared when the
"blocks#render" method is called. Any options specified to the before block will override any options
specified in the block definition.
 <% blocks.define :wizard, :option1 => 1, :option2 => 2 do |options| %>
   Step 2 (:option1 => <%= options[option1] %>, :option2 => <%= options[option2] %>)<br />
 <% end %>

 <% blocks.before :wizard, :option1 => 3 do
   Step 0 (:option1 => <%= options[option1] %>, :option2 => <%= options[option2] %>)<br />
 <% end %>

 <% blocks.before :wizard, :option2 => 4 do
   Step 1 (:option1 => <%= options[option1] %>, :option2 => <%= options[option2] %>)<br />
 <% end %>

 <%= blocks.render :wizard %>

 <!-- Will render:
   Step 0 (:option1 => 3, :option2 => 2)<br />
   Step 1 (:option1 => 1, :option2 => 4)<br />
   Step 2 (:option1 => 1, :option2 => 2)<br />
 -->

 <%= blocks.render :wizard, :step => @step %>

Options:

name

The name of the block to render this code before when that block is rendered

options

Any options to specify to the before block when it renders. These will override any options specified when the block was defined.

block

The block of code to render before another block



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# File 'lib/blocks/base.rb', line 307

def before(name, options={}, &block)
  self.add_block_container_to_list("before_#{name.to_s}", options, &block)
  nil
end

#define(name, options = {}, &block) ⇒ Object

Define a block, unless a block by the same name is already defined.

<%= blocks.define :some_block_name, :parameter1 => "1", :parameter2 => "2" do |options| %>
  <%= options[:parameter1] %> and <%= options[:parameter2] %>
<% end %>

Options:

name

The name of the block being defined (either a string or a symbol)

options

The default options for the block definition. Any or all of these options may be overrideen by whomever calls “blocks.render” on this block.

block

The block that is to be rendered when “blocks.render” is called for this block.



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# File 'lib/blocks/base.rb', line 51

def define(name, options={}, &block)
  collection = options.delete(:collection)

  if collection
    collection.each do |object|
      define(call_with_params(name, object, options), options, &block)
    end
  else
    self.define_block_container(name, options, &block)
  end

  nil
end

#defined?(name) ⇒ Boolean

Checks if a particular block has been defined within the current block scope.

<%= blocks.defined? :some_block_name %>

Options:

name

The name of the block to check

Returns:

  • (Boolean) 


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# File 'lib/blocks/base.rb', line 34

def defined?(name)
  !blocks[name.to_sym].nil?
end

#render(name_or_container, *args, &block) ⇒ Object Also known as: use

Render a block, first rendering any “before” blocks, then rendering the block itself, then rendering any “after” blocks. Additionally, a collection may also be passed in, and Blocks will render an the block, along with corresponding before and after blocks for each element of the collection. Blocks will make either two or four different attempts to render the block, depending on how use_partials is globally set, or an option is passed in to the render call to either use partials or skip partials:

1) Look for a block that has been defined inline elsewhere, using the blocks.define method:
   <% blocks.define :wizard do |options| %>
     Inline Block Step#<%= options[:step] %>.
   <% end %>

   <%= blocks.render :wizard, :step => @step %>
2) [IF use_partials is globally set to true or passed in as a runtime option,
    and skip_partials is not passed in as a runtime option]
   Look for a partial within the current controller's view directory:
   <%= blocks.render :wizard, :step => @step %>

   <!-- In /app/views/pages/_wizard.html.erb (assuming it is the pages controller running): -->
   Controller-specific Block Step# <%= step %>.
3) [IF use_partials is globally set to true or passed in as a runtime option,
    and skip_partials is not passed in as a runtime option]
   Look for a partial with the global blocks view directory (by default /app/views/blocks/):
   <%= blocks.render :wizard, :step => @step %>

   <!-- In /app/views/blocks/_wizard.html.erb: -->
   Global Block Step#<%= step %>.
4) Render the default implementation for the block if provided to the blocks.render call:
   <%= blocks.render :wizard, :step => @step do |options| do %>
     Default Implementation Block Step#<%= options %>.
   <% end %>

Options:

name_or_container

The name of the block to render (either a string or a symbol)

*args

Any arguments to pass to the block to be rendered (and also to be passed to any “before” and “after” blocks). The last argument in the list can be a hash and can include the following special options:

[:collection]
  The collection of elements to render blocks for
[:as]
  The variable name to assign the current element in the collection being rendered over
[:surrounding_tag]
  The content tag to render around a block, which might be particularly useful when rendering a collection of blocks,
  such as for a list or table
[:surrounding_tag_html]
  The attributes to be applied to the HTML content tag, such as styling or special properties. Please note, any Procs passed
  in will automatically be evaluated (For example: :class => lambda { cycle("even", "odd") })
[:use_partials]
  Overrides the globally defined use_partials and tells Blocks to render partials in trying to render a block
[:skip_partials]
  Overrides the globally defined use_partials and tells Blocks to not render any partials in trying to render a block
block

The default block to render if no such block block that is to be rendered when “blocks.render” is called for this block.



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# File 'lib/blocks/base.rb', line 138

def render(name_or_container, *args, &block)
  options = args.extract_options!
  collection = options.delete(:collection)

  buffer = ActiveSupport::SafeBuffer.new

  if collection
    as = options.delete(:as)

    collection.each do |object|
      cloned_args = args.clone
      cloned_args.unshift(object)
      cloned_options = options.clone
      cloned_options = cloned_options.merge(object.options) if object.is_a?(Blocks::Container)
      cloned_args.push(cloned_options)

      block_name = call_with_params(name_or_container, *cloned_args)
      as_name = (as.presence || block_name).to_sym
      cloned_options[as_name] = object

      buffer << render(block_name, *cloned_args, &block)
    end
  else
    surrounding_tag = options.delete(:surrounding_tag)
    surrounding_tag_html = options.delete(:surrounding_tag_html)

    args.push(options)

    if surrounding_tag_surrounds_before_and_after_blocks
      buffer << content_tag_with_block(surrounding_tag, surrounding_tag_html, *args) do
        temp_buffer = ActiveSupport::SafeBuffer.new
        temp_buffer << render_before_blocks(name_or_container, *args)
        temp_buffer << render_block_with_around_blocks(name_or_container, *args, &block)
        temp_buffer << render_after_blocks(name_or_container, *args)
      end
    else
      buffer << render_before_blocks(name_or_container, *args)
      buffer << content_tag_with_block(surrounding_tag, surrounding_tag_html, *args) do
        render_block_with_around_blocks(name_or_container, *args, &block)
      end
      buffer << render_after_blocks(name_or_container, *args)
    end
  end

  buffer
end

#render_with_partials(name_or_container, *args, &block) ⇒ Object

Render a block, first rendering any “before” blocks, then rendering the block itself, then rendering any “after” blocks. Additionally, a collection may also be passed in, and Blocks will render an the block, along with corresponding before and after blocks for each element of the collection. Blocks will make four different attempts to render block:

1) Look for a block that has been defined inline elsewhere, using the blocks.define method:
   <% blocks.define :wizard do |options| %>
     Inline Block Step#<%= options[:step] %>.
   <% end %>

   <%= blocks.render :wizard, :step => @step %>
2) Look for a partial within the current controller's view directory:
   <%= blocks.render :wizard, :step => @step %>

   <!-- In /app/views/pages/_wizard.html.erb (assuming it is the pages controller running): -->
   Controller-specific Block Step# <%= step %>.
3) Look for a partial with the global blocks view directory (by default /app/views/blocks/):
   <%= blocks.render :wizard, :step => @step %>

   <!-- In /app/views/blocks/_wizard.html.erb: -->
   Global Block Step#<%= step %>.
4) Render the default implementation for the block if provided to the blocks.render call:
   <%= blocks.render :wizard, :step => @step do |options| do %>
     Default Implementation Block Step#<%= options %>.
   <% end %>

Options:

name_or_container

The name of the block to render (either a string or a symbol)

*args

Any arguments to pass to the block to be rendered (and also to be passed to any “before” and “after” blocks). The last argument in the list can be a hash and can include the following special options:

[:collection]
  The collection of elements to render blocks for
[:as]
  The variable name to assign the current element in the collection being rendered over
[:surrounding_tag]
  The content tag to render around a block, which might be particularly useful when rendering a collection of blocks,
  such as for a list or table
[:surrounding_tag_html]
  The attributes to be applied to the HTML content tag, such as styling or special properties. Please note, any Procs passed
  in will automatically be evaluated (For example: :class => lambda { cycle("even", "odd") })
block

The default block to render if no such block block that is to be rendered when “blocks.render” is called for this block.



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# File 'lib/blocks/base.rb', line 267

def render_with_partials(name_or_container, *args, &block)
  options = args.extract_options!
  options[:use_partials] = true
  args.push(options)
  render(name_or_container, *args, &block)
end

#render_without_partials(name_or_container, *args, &block) ⇒ Object

Render a block, first rendering any “before” blocks, then rendering the block itself, then rendering any “after” blocks. Additionally, a collection may also be passed in, and Blocks will render an the block, along with corresponding before and after blocks for each element of the collection. Blocks will make two different attempts to render block:

1) Look for a block that has been defined inline elsewhere, using the blocks.define method:
   <% blocks.define :wizard do |options| %>
     Inline Block Step#<%= options[:step] %>.
   <% end %>

   <%= blocks.render :wizard, :step => @step %>
2) Render the default implementation for the block if provided to the blocks.render call:
   <%= blocks.render :wizard, :step => @step do |options| do %>
     Default Implementation Block Step#<%= options %>.
   <% end %>

Options:

name_or_container

The name of the block to render (either a string or a symbol)

*args

Any arguments to pass to the block to be rendered (and also to be passed to any “before” and “after” blocks). The last argument in the list can be a hash and can include the following special options:

[:collection]
  The collection of elements to render blocks for
[:as]
  The variable name to assign the current element in the collection being rendered over
[:surrounding_tag]
  The content tag to render around a block, which might be particularly useful when rendering a collection of blocks,
  such as for a list or table
[:surrounding_tag_html]
  The attributes to be applied to the HTML content tag, such as styling or special properties. Please note, any Procs passed
  in will automatically be evaluated (For example: :class => lambda { cycle("even", "odd") })
block

The default block to render if no such block block that is to be rendered when “blocks.render” is called for this block.



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# File 'lib/blocks/base.rb', line 218

def render_without_partials(name_or_container, *args, &block)
  options = args.extract_options!
  options[:skip_partials] = true
  args.push(options)
  render(name_or_container, *args, &block)
end

#replace(name, options = {}, &block) ⇒ Object

Define a block, replacing an existing block by the same name if it is already defined.

<%= blocks.define :some_block_name, :parameter1 => "1", :parameter2 => "2" do |options| %>
  <%= options[:parameter1] %> and <%= options[:parameter2] %>
<% end %>

<%= blocks.replace :some_block_name, :parameter3 => "3", :parameter4 => "4" do |options| %>
  <%= options[:parameter3] %> and <%= options[:parameter4] %>
<% end %>

Options:

name

The name of the block being defined (either a string or a symbol)

options

The default options for the block definition. Any or all of these options may be overrideen by whomever calls “blocks.render” on this block.

block

The block that is to be rendered when “blocks.render” is called for this block.



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# File 'lib/blocks/base.rb', line 81

def replace(name, options={}, &block)
  blocks[name.to_sym] = nil
  self.define_block_container(name, options, &block)
  nil
end