Adds subtasking (#443) including:

* priority, start/due dates, progress, estimate, spent time roll-up to parent issues
* descendant issues tree displayed on the issue view with context menu support
* issue tree display on the gantt chart
* issue tree copy on project copy
* unlimited nesting

Defining subtasks requires the new permission 'Manage subtasks'.
Subtasks can not belong to a different project than the parent task.

Implementation is based on scoped nested sets for fast reads and updates.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3573 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/issues/_attributes.rhtml

@@ -7,7 +7,7 @@
 <p><label><%= l(:field_status) %></label> <%= @issue.status.name %></p>
 <% end %>
 
-<p><%= f.select :priority_id, (@priorities.collect {|p| [p.name, p.id]}), :required => true %></p>
+<p><%= f.select :priority_id, (@priorities.collect {|p| [p.name, p.id]}), {:required => true}, :disabled => !@issue.leaf? %></p>
 <p><%= f.select :assigned_to_id, (@issue.assignable_users.collect {|m| [m.name, m.id]}), :include_blank => true %></p>
 <% unless @project.issue_categories.empty? %>
 <p><%= f.select :category_id, (@project.issue_categories.collect {|c| [c.name, c.id]}), :include_blank => true %>
@@ -31,10 +31,10 @@
 </div>
 
 <div class="splitcontentright">
-<p><%= f.text_field :start_date, :size => 10 %><%= calendar_for('issue_start_date') %></p>
-<p><%= f.text_field :due_date, :size => 10 %><%= calendar_for('issue_due_date') %></p>
-<p><%= f.text_field :estimated_hours, :size => 3 %> <%= l(:field_hours) %></p>
-<% if Issue.use_field_for_done_ratio? %>
+<p><%= f.text_field :start_date, :size => 10, :disabled => !@issue.leaf? %><%= calendar_for('issue_start_date') if @issue.leaf? %></p>
+<p><%= f.text_field :due_date, :size => 10, :disabled => !@issue.leaf? %><%= calendar_for('issue_due_date') if @issue.leaf? %></p>
+<p><%= f.text_field :estimated_hours, :size => 3, :disabled => !@issue.leaf? %> <%= l(:field_hours) %></p>
+<% if @issue.leaf? && Issue.use_field_for_done_ratio? %>
 <p><%= f.select :done_ratio, ((0..10).to_a.collect {|r| ["#{r*10} %", r*10] }) %></p>
 <% end %>
 </div>

app/views/issues/_form.rhtml

@@ -5,6 +5,16 @@
                                      :with => "Form.serialize('issue-form')" %>
 
 <p><%= f.text_field :subject, :size => 80, :required => true %></p>
+                                     
+<% unless (@issue.new_record? && @issue.parent_issue_id.nil?) || !User.current.allowed_to?(:manage_subtasks, @project) %>
+<p><%= f.text_field :parent_issue_id, :size => 10 %></p>
+<div id="parent_issue_candidates" class="autocomplete"></div>
+<%= javascript_tag "observeParentIssueField('#{url_for(:controller => :issues,
+                                                       :action => :auto_complete,
+                                                       :id => @issue,
+                                                       :project_id => @project) }')" %>
+<% end %>
+
 <p><%= f.text_area :description,
                    :cols => 60,
                    :rows => (@issue.description.blank? ? 10 : [[10, @issue.description.length / 50].max, 100].min),

app/views/issues/auto_complete.html.erb

@@ -0,0 +1,9 @@
+<ul>
+<% if @issues.any? -%>
+  <% @issues.each do |issue| -%>
+    <%= content_tag 'li', h("#{issue.tracker} ##{issue.id}: #{issue.subject}"), :id => issue.id %>
+  <% end -%>
+<% else -%>
+  <%= content_tag("li", l(:label_none), :style => 'display:none') %>
+<% end -%>
+</ul>

app/views/issues/gantt.rhtml

@@ -79,8 +79,10 @@ t_height = g_height + headers_height
 # Tasks subjects
 #
 top = headers_height + 8
-@gantt.events.each do |i| %>
-    <div style="position: absolute;line-height:1.2em;height:16px;top:<%= top %>px;left:4px;overflow:hidden;"><small>    
+@gantt.events.each do |i|
+left = 4 + (i.is_a?(Issue) ? i.level * 16 : 0)
+ %>
+    <div style="position: absolute;line-height:1.2em;height:16px;top:<%= top %>px;left:<%= left %>px;overflow:hidden;"><small>    
     <% if i.is_a? Issue %>
       	<%= h("#{i.project} -") unless @project && @project == i.project %>
       	<%= link_to_issue i %>
@@ -189,15 +191,16 @@ top = headers_height + 10
 	i_width = ((i_end_date - i_start_date + 1)*zoom).floor - 2                  # total width of the issue (- 2 for left and right borders)
 	d_width = ((i_done_date - i_start_date)*zoom).floor - 2                     # done width
 	l_width = i_late_date ? ((i_late_date - i_start_date+1)*zoom).floor - 2 : 0 # delay width
+  css = "task " + (i.leaf? ? 'leaf' : 'parent')
 	%>
-	<div style="top:<%= top %>px;left:<%= i_left %>px;width:<%= i_width %>px;" class="task task_todo">&nbsp;</div>
+	<div style="top:<%= top %>px;left:<%= i_left %>px;width:<%= i_width %>px;" class="<%= css %> task_todo"><div class="left"></div>&nbsp;<div class="right"></div></div>
 	<% if l_width > 0 %>
-	    <div style="top:<%= top %>px;left:<%= i_left %>px;width:<%= l_width %>px;" class="task task_late">&nbsp;</div>
+	    <div style="top:<%= top %>px;left:<%= i_left %>px;width:<%= l_width %>px;" class="<%= css %> task_late">&nbsp;</div>
 	<% end %>
 	<% if d_width > 0 %>
-	    <div style="top:<%= top %>px;left:<%= i_left %>px;width:<%= d_width %>px;" class="task task_done">&nbsp;</div>
+	    <div style="top:<%= top %>px;left:<%= i_left %>px;width:<%= d_width %>px;" class="<%= css %> task_done">&nbsp;</div>
 	<% end %>
-	<div style="top:<%= top %>px;left:<%= i_left + i_width + 5 %>px;background:#fff;" class="task">
+	<div style="top:<%= top %>px;left:<%= i_left + i_width + 8 %>px;background:#fff;" class="<%= css %>">
 	<%= i.status.name %>
 	<%= (i.done_ratio).to_i %>%
 	</div>

app/views/issues/show.rhtml

@@ -4,7 +4,10 @@
 
 <div class="<%= @issue.css_classes %> details">
         <%= avatar(@issue.author, :size => "50") %>
-        <h3><%=h @issue.subject %></h3>
+      
+<div class="subject">      
+<%= render_issue_subject_with_tree(@issue) %>
+</div>
         <p class="author">
         <%= authoring @issue.created_on, @issue.author %>.
         <% if @issue.created_on != @issue.updated_on %>
@@ -56,6 +59,17 @@
 
 <%= call_hook(:view_issues_show_description_bottom, :issue => @issue) %>
 
+<% if !@issue.leaf? || User.current.allowed_to?(:manage_subtasks, @project) %>
+<hr />
+<div id="issue_tree">
+<div class="contextual">
+  <%= link_to(l(:button_add), {:controller => 'issues', :action => 'new', :project_id => @project, :issue => {:parent_issue_id => @issue}}) if User.current.allowed_to?(:manage_subtasks, @project) %>
+</div>
+<p><strong><%=l(:label_subtask_pural)%></strong></p>
+<%= render_descendants_tree(@issue) unless @issue.leaf? %>
+</div>
+<% end %>
+
 <% if authorize_for('issue_relations', 'new') || @issue.relations.any? %>
 <hr />
 <div id="relations">
@@ -113,4 +127,8 @@
 <% content_for :header_tags do %>
     <%= auto_discovery_link_tag(:atom, {:format => 'atom', :key => User.current.rss_key}, :title => "#{@issue.project} - #{@issue.tracker} ##{@issue.id}: #{@issue.subject}") %>
     <%= stylesheet_link_tag 'scm' %>
+    <%= javascript_include_tag 'context_menu' %>
+    <%= stylesheet_link_tag 'context_menu' %>
 <% end %>
+<div id="context-menu" style="display: none;"></div>
+<%= javascript_tag "new ContextMenu('#{url_for(:controller => 'issues', :action => 'context_menu')}')" %>