diff options
Diffstat (limited to 'actionpack/lib/action_controller/abstract/layouts.rb')
-rw-r--r-- | actionpack/lib/action_controller/abstract/layouts.rb | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/abstract/layouts.rb b/actionpack/lib/action_controller/abstract/layouts.rb new file mode 100644 index 0000000000..478b301a26 --- /dev/null +++ b/actionpack/lib/action_controller/abstract/layouts.rb @@ -0,0 +1,82 @@ +module AbstractController + module Layouts + + depends_on Renderer + + module ClassMethods + def layout(layout) + unless [String, Symbol, FalseClass, NilClass].include?(layout.class) + raise ArgumentError, "Layouts must be specified as a String, Symbol, false, or nil" + end + + @_layout = layout || false # Converts nil to false + _write_layout_method + end + + def _implied_layout_name + name.underscore + end + + # Takes the specified layout and creates a _layout method to be called + # by _default_layout + # + # If the specified layout is a: + # String:: return the string + # Symbol:: call the method specified by the symbol + # false:: return nil + # none:: If a layout is found in the view paths with the controller's + # name, return that string. Otherwise, use the superclass' + # layout (which might also be implied) + def _write_layout_method + case @_layout + when String + self.class_eval %{def _layout() #{@_layout.inspect} end} + when Symbol + self.class_eval %{def _layout() #{@_layout} end} + when false + self.class_eval %{def _layout() end} + else + self.class_eval %{ + def _layout + if view_paths.find_by_parts?("#{_implied_layout_name}", formats, "layouts") + "#{_implied_layout_name}" + else + super + end + end + } + end + end + end + + def _render_template(template, options) + _action_view._render_template_with_layout(template, options[:_layout]) + end + + private + + def _layout() end # This will be overwritten + + def _layout_for_name(name) + unless [String, FalseClass, NilClass].include?(name.class) + raise ArgumentError, "String, false, or nil expected; you passed #{name.inspect}" + end + + name && view_paths.find_by_parts(name, formats, "layouts") + end + + def _default_layout(require_layout = false) + if require_layout && !_layout + raise ArgumentError, + "There was no default layout for #{self.class} in #{view_paths.inspect}" + end + + begin + layout = _layout_for_name(_layout) + rescue NameError => e + raise NoMethodError, + "You specified #{@_layout.inspect} as the layout, but no such method was found" + end + end + end +end
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