New setting added to specify how many objects should be displayed on most paginated lists.

Default is: 25, 50, 100 (users can choose one of these values).
If one value only is entered in this setting (eg. 25), the 'per page' links are not displayed (prior behaviour).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1026 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/application.rb

@@ -158,6 +158,21 @@ class ApplicationController < ActionController::Base
     attachments
   end
 
+  # Returns the number of objects that should be displayed
+  # on the paginated list
+  def per_page_option
+    per_page = nil
+    if params[:per_page] && Setting.per_page_options_array.include?(params[:per_page].to_s.to_i)
+      per_page = params[:per_page].to_s.to_i
+      session[:per_page] = per_page
+    elsif session[:per_page]
+      per_page = session[:per_page]
+    else
+      per_page = Setting.per_page_options_array.first || 25
+    end
+    per_page
+  end
+
   # qvalues http header parser
   # code taken from webrick
   def parse_qvalues(value)