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module ActionView
module Layouts
# You can think of a layout as a method that is called with a block. _layout_for
# returns the contents that are yielded to the layout. If the user calls yield
# :some_name, the block, by default, returns content_for(:some_name). If the user
# calls yield, the default block returns content_for(:layout).
#
# The user can override this default by passing a block to the layout.
#
# ==== Example
#
# # The template
# <% render :layout => "my_layout" do %>Content<% end %>
#
# # The layout
# <html><% yield %></html>
#
# In this case, instead of the default block, which would return content_for(:layout),
# this method returns the block that was passed in to render layout, and the response
# would be <html>Content</html>.
#
# Finally, the block can take block arguments, which can be passed in by yield.
#
# ==== Example
#
# # The template
# <% render :layout => "my_layout" do |customer| %>Hello <%= customer.name %><% end %>
#
# # The layout
# <html><% yield Struct.new(:name).new("David") %></html>
#
# In this case, the layout would receive the block passed into <tt>render :layout</tt>,
# and the Struct specified in the layout would be passed into the block. The result
# would be <html>Hello David</html>.
def _layout_for(name = nil, &block) #:nodoc:
if !block || name
@_content_for[name || :layout]
else
capture(&block)
end
end
# This is the method which actually finds the layout using details in the lookup
# context object. If no layout is found, it checkes if at least a layout with
# the given name exists across all details before raising the error.
#
# If self.formats contains several formats, just the first one is considered in
# the layout lookup.
def find_layout(layout)
begin
if formats.size == 1
_find_layout(layout)
else
update_details(:formats => self.formats.first){ _find_layout(layout) }
end
rescue ActionView::MissingTemplate => e
update_details(:formats => nil) do
raise unless template_exists?(layout)
end
end
end
def _find_layout(layout) #:nodoc:
layout =~ /^\// ?
with_fallbacks { find_template(layout) } : find_template(layout)
end
# Contains the logic that actually renders the layout.
def _render_layout(layout, locals, &block) #:nodoc:
layout.render(self, locals){ |*name| _layout_for(*name, &block) }
end
end
end
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