+ def style_rules
+ css = ""
+
+ css << ".hidden { display: none }";
+ css << ".hide_unless_logged_in { display: none }" unless @user;
+ css << ".hide_if_logged_in { display: none }" if @user;
+ css << ".hide_if_user_#{@user.id} { display: none }" if @user;
+ css << ".show_if_user_#{@user.id} { display: inline }" if @user;
+ css << ".hide_unless_administrator { display: none }" unless @user and @user.administrator?;
+
+ return content_tag(:style, css)
+ end
+
+ def if_logged_in(tag = :div, &block)
+ concat(content_tag(tag, capture(&block), :class => "hide_unless_logged_in"))
+ end
+
+ def if_not_logged_in(tag = :div, &block)
+ concat(content_tag(tag, capture(&block), :class => "hide_if_logged_in"))
+ end
+
+ def if_user(user, tag = :div, &block)
+ if user
+ concat(content_tag(tag, capture(&block), :class => "hidden show_if_user_#{user.id}"))
+ end
+ end
+
+ def unless_user(user, tag = :div, &block)
+ if user
+ concat(content_tag(tag, capture(&block), :class => "hide_if_user_#{user.id}"))
+ else
+ concat(content_tag(tag, capture(&block)))
+ end
+ end
+
+ def if_administrator(tag = :div, &block)
+ concat(content_tag(tag, capture(&block), :class => "hide_unless_administrator"))
+ end
+