+1
Additionally modifying start date, due date, progress and issue relations is useful in context of gant.
THis is not directly part of nowadays context menu
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+1
We also hope for this feature to be implemented.
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+1
I'm currently experimenting how to solve that - sadly I'm currently very unexperienced in Ruby/Rails programming...
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As Ruby noob I tried to understand how to implement context menus in Redmine, but currently I'm stucked with some (derivation?) problems with the view hooks and the @Gantt@ class.

Currently I implemented inside Gantt:
* the context menu attributes for CSS
* the context menu hooks / placeholders in show.erb
* added the @context_menu_link()@ for each issue, which causes the following error:

<pre>
Started GET "/redmine/projects/huk_handerfassung/issues/gantt" for 192.168.10.30 at Tue Apr 01 15:34:34 +0200 2014
Processing by GanttsController#show as HTML
Parameters: {"project_id"=>"huk_handerfassung"}
Current user: chris (id=2)
Rendered queries/_filters.html.erb (45.0ms)
Rendered gantts/show.html.erb within layouts/base (444.3ms)
Completed 500 Internal Server Error in 1061.5ms

ActionView::Template::Error (undefined method `link_to' for #<Redmine::Helpers::Gantt:0xb463e6d8>):
102:
103: # Width of the entire chart
104: g_width = ((@gantt.date_to - @gantt.date_from + 1) * zoom).to_i
105: @gantt.render(:top => headers_height + 8,
106: :zoom => zoom,
107: :g_width => g_width,
108: :subject_width => subject_width)
app/helpers/context_menus_helper.rb:34:in `context_menu_link'
lib/redmine/helpers/gantt.rb:387:in `subject_for_issue'
lib/redmine/helpers/gantt.rb:239:in `render_issues'
lib/redmine/helpers/gantt.rb:238:in `each'
lib/redmine/helpers/gantt.rb:238:in `render_issues'
lib/redmine/helpers/gantt.rb:224:in `render_project'
lib/redmine/helpers/gantt.rb:206:in `render'
app/models/project.rb:748:in `project_tree'
app/models/project.rb:744:in `each'
app/models/project.rb:744:in `project_tree'
lib/redmine/helpers/gantt.rb:204:in `render'
app/views/gantts/show.html.erb:105:in `_app_views_gantts_show_html_erb___32399475__631731208'
app/controllers/gantts_controller.rb:44:in `show'
app/controllers/gantts_controller.rb:43:in `show'
</pre>

Attached my diff (created by @svn diff@ command) for the following SVN version of Redmine:

<pre>
RL: http://svn.redmine.org/redmine/branches/2.4-stable
Basis des Projektarchivs: http://svn.redmine.org/redmine
UUID des Projektarchivs: e93f8b46-1217-0410-a6f0-8f06a7374b81
Revision: 13036
Knotentyp: Verzeichnis
Plan: normal
Letzter Autor: jplang
Letzte geänderte Rev: 13031
Letztes Änderungsdatum: 2014-03-29 17:06:51 +0100 (Sa, 29. Mär 2014)
</pre>

Environment:

<pre>
> Debian Wheezy + Apache2 + mod_passenger + Redmine 2.4
> bundle show
Gems included by the bundle:
* actionmailer (3.2.17)
* actionpack (3.2.17)
* activemodel (3.2.17)
* activerecord (3.2.17)
* activeresource (3.2.17)
* activesupport (3.2.17)
* arel (3.0.3)
* builder (3.0.0)
* bundler (1.3.5)
* coderay (1.1.0)
* erubis (2.7.0)
* fastercsv (1.5.5)
* hike (1.2.3)
* i18n (0.6.9)
* journey (1.0.4)
* jquery-rails (2.0.3)
* json (1.8.1)
* mail (2.5.4)
* mime-types (1.25.1)
* multi_json (1.9.2)
* mysql2 (0.3.15)
* net-ldap (0.3.1)
* polyglot (0.3.4)
* rack (1.4.5)
* rack-cache (1.2)
* rack-openid (1.4.2)
* rack-ssl (1.3.4)
* rack-test (0.6.2)
* rails (3.2.17)
* railties (3.2.17)
* rake (10.1.1)
* rdoc (3.12.2)
* rmagick (2.13.2)
* ruby-openid (2.3.0)
* sprockets (2.2.2)
* thor (0.19.1)
* tilt (1.4.1)
* treetop (1.4.15)
* tzinfo (0.3.39)
</pre>

Has anybody a hint how to solve this undefined method error? I already tried to let the class Gantt inherit the view listener hook class, but this lead to much more errors :(
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Here's a sample UI for editing issue timelines directly from a gantt chart: http://teamgantt.com/img/test3.gif
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That looks great - would really love to see it in Redmine - because even with plugins like "redmine_planning" working with industry leading methods like Gantt is a (sorry) pain in the ass with (community) Redmine.

Currently only commercial Redmine forks have a really neat usability, while the community version lacks even very basic features like a simple context menu.

I'm hardly trying to dive into plugin programming which is really hard thanks to the lack of docu and help of the devs.

Sadly nobody cares about new contributors.
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Please try out the attached patch series.
By applying the patches, a context menu is added on each issues and gantt bars. You will be able to manipulate the issue through the context menu. I think the gantt chart will be easier to use.

|!issue_subject.png!|!task_bar.png!|
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+100 !!
I also want to operate the Gantt Chart on the context menu like a Roadmap or Issue list.

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This simple patch greatly improves UI/UX of gantt.
Let's deliver this feature in the next major release.
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Committed in the trunk.
Mizuki ISHIKAWA, thank you for improving Redmine.
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I've added some basic assertions for this feature.
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Marius BALTEANU wrote:
> I've added some basic assertions for this feature.

Committed. Thank you.
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