diff options
Diffstat (limited to 'actionpack/lib/abstract_controller/layouts.rb')
| -rw-r--r-- | actionpack/lib/abstract_controller/layouts.rb | 176 |
1 files changed, 115 insertions, 61 deletions
diff --git a/actionpack/lib/abstract_controller/layouts.rb b/actionpack/lib/abstract_controller/layouts.rb index bbf5efe565..bc9f6fc3e8 100644 --- a/actionpack/lib/abstract_controller/layouts.rb +++ b/actionpack/lib/abstract_controller/layouts.rb @@ -66,27 +66,40 @@ module AbstractController # == Inheritance Examples # # class BankController < ActionController::Base - # layout "bank_standard" + # # bank.html.erb exists + # + # class ExchangeController < BankController + # # exchange.html.erb exists + # + # class CurrencyController < BankController # # class InformationController < BankController + # layout "information" # - # class TellerController < BankController + # class TellerController < InformationController # # teller.html.erb exists # - # class TillController < TellerController + # class EmployeeController < InformationController + # # employee.html.erb exists + # layout nil # # class VaultController < BankController # layout :access_level_layout # - # class EmployeeController < BankController - # layout nil + # class TillController < BankController + # layout false # - # In these examples: - # * The InformationController uses the "bank_standard" layout, inherited from BankController. - # * The TellerController follows convention and uses +app/views/layouts/teller.html.erb+. - # * The TillController inherits the layout from TellerController and uses +teller.html.erb+ as well. + # In these examples, we have three implicit lookup scenarios: + # * The BankController uses the "bank" layout. + # * The ExchangeController uses the "exchange" layout. + # * The CurrencyController inherits the layout from BankController. + # + # However, when a layout is explicitly set, the explicitly set layout wins: + # * The InformationController uses the "information" layout, explicitly set. + # * The TellerController also uses the "information" layout, because the parent explicitly set it. + # * The EmployeeController uses the "employee" layout, because it set the layout to nil, resetting the parent configuration. # * The VaultController chooses a layout dynamically by calling the <tt>access_level_layout</tt> method. - # * The EmployeeController does not use a layout at all. + # * The TillController does not use a layout at all. # # == Types of layouts # @@ -107,6 +120,7 @@ module AbstractController # def writers_and_readers # logged_in? ? "writer_layout" : "reader_layout" # end + # end # # Now when a new request for the index action is processed, the layout will vary depending on whether the person accessing # is logged in or not. @@ -114,7 +128,14 @@ module AbstractController # If you want to use an inline method, such as a proc, do something like this: # # class WeblogController < ActionController::Base - # layout proc{ |controller| controller.logged_in? ? "writer_layout" : "reader_layout" } + # layout proc { |controller| controller.logged_in? ? "writer_layout" : "reader_layout" } + # end + # + # If an argument isn't given to the proc, it's evaluated in the context of + # the current controller anyway. + # + # class WeblogController < ActionController::Base + # layout proc { logged_in? ? "writer_layout" : "reader_layout" } # end # # Of course, the most common way of specifying a layout is still just as a plain template name: @@ -123,8 +144,24 @@ module AbstractController # layout "weblog_standard" # end # - # If no directory is specified for the template name, the template will by default be looked for in <tt>app/views/layouts/</tt>. - # Otherwise, it will be looked up relative to the template root. + # The template will be looked always in <tt>app/views/layouts/</tt> folder. But you can point + # <tt>layouts</tt> folder direct also. <tt>layout "layouts/demo"</tt> is the same as <tt>layout "demo"</tt>. + # + # Setting the layout to nil forces it to be looked up in the filesystem and fallbacks to the parent behavior if none exists. + # Setting it to nil is useful to re-enable template lookup overriding a previous configuration set in the parent: + # + # class ApplicationController < ActionController::Base + # layout "application" + # end + # + # class PostsController < ApplicationController + # # Will use "application" layout + # end + # + # class CommentsController < ApplicationController + # # Will search for "comments" layout and fallback "application" layout + # layout nil + # end # # == Conditional layouts # @@ -166,13 +203,15 @@ module AbstractController include Rendering included do - class_attribute :_layout_conditions - remove_possible_method :_layout_conditions - delegate :_layout_conditions, :to => :'self.class' + class_attribute :_layout, :_layout_conditions, + :instance_reader => false, :instance_writer => false + self._layout = nil self._layout_conditions = {} _write_layout_method end + delegate :_layout_conditions, :to => "self.class" + module ClassMethods def inherited(klass) super @@ -188,7 +227,7 @@ module AbstractController # # ==== Returns # * <tt> Boolean</tt> - True if the action has a layout, false otherwise. - def action_has_layout? + def conditional_layout? return unless super conditions = _layout_conditions @@ -207,10 +246,10 @@ module AbstractController # # If the specified layout is a: # String:: the String is the template name - # Symbol:: call the method specified by the symbol, which will return - # the template name + # Symbol:: call the method specified by the symbol, which will return the template name # false:: There is no layout # true:: raise an ArgumentError + # nil:: Force default layout behavior with inheritance # # ==== Parameters # * <tt>layout</tt> - The layout to use. @@ -224,7 +263,7 @@ module AbstractController conditions.each {|k, v| conditions[k] = Array(v).map {|a| a.to_s} } self._layout_conditions = conditions - @_layout = layout || false # Converts nil to false + self._layout = layout _write_layout_method end @@ -244,43 +283,50 @@ module AbstractController def _write_layout_method remove_possible_method(:_layout) - case defined?(@_layout) ? @_layout : nil - when String - self.class_eval %{def _layout; #{@_layout.inspect} end}, __FILE__, __LINE__ - when Symbol - self.class_eval <<-ruby_eval, __FILE__, __LINE__ + 1 - def _layout - #{@_layout}.tap do |layout| + prefixes = _implied_layout_name =~ /\blayouts/ ? [] : ["layouts"] + name_clause = if name + <<-RUBY + lookup_context.find_all("#{_implied_layout_name}", #{prefixes.inspect}).first || super + RUBY + else + <<-RUBY + super + RUBY + end + + layout_definition = case _layout + when String + _layout.inspect + when Symbol + <<-RUBY + #{_layout}.tap do |layout| unless layout.is_a?(String) || !layout - raise ArgumentError, "Your layout method :#{@_layout} returned \#{layout}. It " \ + raise ArgumentError, "Your layout method :#{_layout} returned \#{layout}. It " \ "should have returned a String, false, or nil" end end - end - ruby_eval - when Proc - define_method :_layout_from_proc, &@_layout - self.class_eval %{def _layout; _layout_from_proc(self) end}, __FILE__, __LINE__ - when false - self.class_eval %{def _layout; end}, __FILE__, __LINE__ - when true - raise ArgumentError, "Layouts must be specified as a String, Symbol, false, or nil" - when nil - if name - _prefixes = _implied_layout_name =~ /\blayouts/ ? [] : ["layouts"] - - self.class_eval <<-RUBY, __FILE__, __LINE__ + 1 - def _layout - if template_exists?("#{_implied_layout_name}", #{_prefixes.inspect}) - "#{_implied_layout_name}" - else - super - end - end RUBY - end + when Proc + define_method :_layout_from_proc, &_layout + _layout.arity == 0 ? "_layout_from_proc" : "_layout_from_proc(self)" + when false + nil + when true + raise ArgumentError, "Layouts must be specified as a String, Symbol, Proc, false, or nil" + when nil + name_clause end - self.class_eval { private :_layout } + + self.class_eval <<-RUBY, __FILE__, __LINE__ + 1 + def _layout + if conditional_layout? + #{layout_definition} + else + #{name_clause} + end + end + private :_layout + RUBY end end @@ -288,9 +334,8 @@ module AbstractController super if _include_layout?(options) - layout = options.key?(:layout) ? options.delete(:layout) : :default - value = _layout_for_option(layout) - options[:layout] = (value =~ /\blayouts/ ? value : "layouts/#{value}") if value + layout = options.delete(:layout) { :default } + options[:layout] = _layout_for_option(layout) end end @@ -305,6 +350,10 @@ module AbstractController @_action_has_layout end + def conditional_layout? + true + end + private # This will be overwritten by _write_layout_method @@ -316,16 +365,21 @@ module AbstractController # * <tt>name</tt> - The name of the template def _layout_for_option(name) case name - when String then name - when true then _default_layout(true) - when :default then _default_layout(false) + when String then _normalize_layout(name) + when Proc then name + when true then Proc.new { _default_layout(true) } + when :default then Proc.new { _default_layout(false) } when false, nil then nil else raise ArgumentError, - "String, true, or false, expected for `layout'; you passed #{name.inspect}" + "String, Proc, :default, true, or false, expected for `layout'; you passed #{name.inspect}" end end + def _normalize_layout(value) + value.is_a?(String) && value !~ /\blayouts/ ? "layouts/#{value}" : value + end + # Returns the default layout for this controller. # Optionally raises an exception if the layout could not be found. # @@ -337,17 +391,17 @@ module AbstractController # * <tt>template</tt> - The template object for the default layout (or nil) def _default_layout(require_layout = false) begin - layout_name = _layout if action_has_layout? + value = _layout if action_has_layout? rescue NameError => e raise e, "Could not render layout: #{e.message}" end - if require_layout && action_has_layout? && !layout_name + if require_layout && action_has_layout? && !value raise ArgumentError, "There was no default layout for #{self.class} in #{view_paths.inspect}" end - layout_name + _normalize_layout(value) end def _include_layout?(options) |