Added sort order of taskbar by using sortable.

app/assets/javascripts/app/controllers/task_widget.js.coffee

@@ -44,6 +44,24 @@ class App.TaskWidget extends App.Controller
       taskBarActions: @_getTaskActions()
     )
 
+    dndOptions =
+      tolerance:            'pointer'
+      distance:             15
+      opacity:              0.6
+      forcePlaceholderSize: true
+      items:                '> a'
+      update:               =>
+        items = @el.find('.taskbar > a')
+        order = []
+        for item in items
+          key = $(item).data('key')
+          if !key
+            throw "No such key attributes found for task item"
+          order.push key
+        App.TaskManager.reorder( order  )
+
+    @el.find( '.taskbar' ).sortable( dndOptions )
+
   remove: (e) =>
     e.preventDefault()
     key = $(e.target).parent().data('key')

app/assets/javascripts/app/lib/app_post/task_manager.js.coffee

@@ -34,6 +34,11 @@ class App.TaskManager
       _instance ?= new _Singleton
     _instance.notify( key )
 
+  @reorder: ( order ) ->
+    if _instance == undefined
+      _instance ?= new _Singleton
+    _instance.reorder( order )
+
   @reset: ->
     if _instance == undefined
       _instance ?= new _Singleton
@@ -59,7 +64,11 @@ class _Singleton extends App.Controller
     @tasksInitial()
 
   all: ->
-    App.Taskbar.all()
+    tasks = App.Taskbar.all()
+    tasks = _(tasks).sortBy( (task) ->
+      return task.prio;
+    )
+    return tasks
 
   worker: ( key ) ->
     return @workers[ key ] if @workers[ key ]
@@ -83,6 +92,7 @@ class _Singleton extends App.Controller
         params:   params
         callback: callback
         client_id: 123
+        prio:     App.Taskbar.count() + 1
         notify:   false
         active:   active
       )
@@ -213,6 +223,16 @@ class _Singleton extends App.Controller
     task.save()
     App.Event.trigger 'ui:rerender'
 
+  reorder: ( order ) =>
+    prio = 0
+    for key in order
+      task = @get( key )
+      if !task
+        throw "No such task with '#{key}' of order"
+      prio++
+      task.prio = prio
+      task.save()
+
   reset: =>
     App.Taskbar.deleteAll()
     App.Event.trigger 'ui:rerender'

app/assets/javascripts/app/models/taskbar.js.coffee

@@ -1,5 +1,5 @@
 class App.Taskbar extends App.Model
-  @configure 'Taskbar', 'key', 'client_id', 'callback', 'state', 'params', 'notify', 'active'
+  @configure 'Taskbar', 'key', 'client_id', 'callback', 'state', 'params', 'prio', 'notify', 'active'
 #  @extend Spine.Model.Local
   @extend Spine.Model.Ajax
   @url: 'api/taskbar'

db/migrate/20130529124443_taskbar.rb

@@ -8,6 +8,7 @@ class Taskbar < ActiveRecord::Migration
       t.column :callback,                   :string,    :limit => 100,  :null => false
       t.column :state,    				    :string,    :limit => 8000, :null => true
       t.column :params,					    :string,    :limit => 2000, :null => true
+      t.column :prio,                       :integer,   :null => false
       t.column :notify,                     :boolean,   :null => false, :default => false
       t.column :active,                     :boolean,   :null => false, :default => false
       t.timestamps