2010-03-08 08:46:57 -05:00
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module ActionView
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module Layouts
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# You can think of a layout as a method that is called with a block. _layout_for
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# returns the contents that are yielded to the layout. If the user calls yield
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# :some_name, the block, by default, returns content_for(:some_name). If the user
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# calls yield, the default block returns content_for(:layout).
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#
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# The user can override this default by passing a block to the layout.
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#
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# ==== Example
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#
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# # The template
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# <%= render :layout => "my_layout" do %>Content<% end %>
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2010-03-08 08:46:57 -05:00
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#
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# # The layout
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# <html><% yield %></html>
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#
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# In this case, instead of the default block, which would return content_for(:layout),
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# this method returns the block that was passed in to render layout, and the response
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# would be <html>Content</html>.
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#
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# Finally, the block can take block arguments, which can be passed in by yield.
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#
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# ==== Example
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#
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# # The template
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2010-03-12 07:39:47 -05:00
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# <%= render :layout => "my_layout" do |customer| %>Hello <%= customer.name %><% end %>
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2010-03-08 08:46:57 -05:00
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#
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# # The layout
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# <html><% yield Struct.new(:name).new("David") %></html>
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#
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# In this case, the layout would receive the block passed into <tt>render :layout</tt>,
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# and the Struct specified in the layout would be passed into the block. The result
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# would be <html>Hello David</html>.
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def _layout_for(name = nil, &block) #:nodoc:
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if !block || name
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@_content_for[name || :layout]
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else
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capture(&block)
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end
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end
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# This is the method which actually finds the layout using details in the lookup
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# context object. If no layout is found, it checkes if at least a layout with
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# the given name exists across all details before raising the error.
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#
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# If self.formats contains several formats, just the first one is considered in
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# the layout lookup.
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def find_layout(layout)
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begin
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if formats.size == 1
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_find_layout(layout)
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else
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2010-03-19 12:20:15 -04:00
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update_details(:formats => self.formats.first){ _find_layout(layout) }
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end
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2010-03-08 08:46:57 -05:00
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rescue ActionView::MissingTemplate => e
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update_details(:formats => nil) do
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raise unless template_exists?(layout)
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end
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end
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end
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2010-03-16 18:35:45 -04:00
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def _find_layout(layout) #:nodoc:
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layout =~ /^\// ?
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with_fallbacks { find_template(layout) } : find_template(layout)
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end
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2010-03-08 08:46:57 -05:00
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# Contains the logic that actually renders the layout.
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def _render_layout(layout, locals, &block) #:nodoc:
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layout.render(self, locals){ |*name| _layout_for(*name, &block) }
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end
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end
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end
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