1 files changed, 86 insertions, 0 deletions
diff --git a/js/app/services/undoqueue.coffee b/js/app/services/undoqueue.coffee
new file mode 100644
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+++ b/js/app/services/undoqueue.coffee
@@ -0,0 +1,86 @@
+###
+
+ownCloud - App Framework
+
+@author Bernhard Posselt
+@copyright 2012 Bernhard Posselt nukeawhale@gmail.com
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+License as published by the Free Software Foundation; either
+version 3 of the License, or any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU AFFERO GENERAL PUBLIC LICENSE for more details.
+
+You should have received a copy of the GNU Affero General Public
+License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
+###
+
+# A class which follows the command pattern
+# Can be used for actions that need need to be able to undo like folder deletion
+angular.module('News').factory 'UndoQueue',
+['$timeout', '$rootScope',
+($timeout, $rootScope) ->
+
+	class UndoQueue
+
+		constructor: (@_$timeout, @_$rootScope) ->
+			@_queue = []
+
+
+		add: (@_caption, @_callback, @_timeout=0, @_undoCallback=null) ->
+			###
+			@_caption the caption which indentifies the item
+			@_callback function the callback which should be executed when it was
+			not undone, this will usually be a request to the server to finally
+			delete something
+			@_timeout int the timeout after the callback should be executed
+			defaults to 0
+			@_undoCallback function the function which should be executed when
+			an command has been canceled. Usually this will add back a deleted
+			object back to the interface, defaults to an empty function
+			###
+			@_executeAll()
+
+			command =
+				_undoCallback: @_undoCallback or= ->
+				_callback: @_callback
+				execute: =>
+					command._callback()
+				undo: =>
+					command._undoCallback()
+					@_$timeout.cancel(command.promise)
+					@_queue = []
+				promise: @_$timeout =>
+					command.execute()
+					@_$rootScope.$broadcast('notUndone')
+				, @_timeout
+
+			data =
+				undoCallback: command.undo
+				caption: @_caption
+
+			@_$rootScope.$broadcast 'undoMessage', data
+
+			@_queue.push(command)
+
+
+		_executeAll: ->
+			###
+			Executes the callback before the timeout has run out
+			This is useful to execute all remaining commands if a new command is
+			added
+			###
+			for command in @_queue
+				@_$timeout.cancel(command.promise)
+				command.execute()
+			@_queue = []
+
+
+	return new UndoQueue($timeout, $rootScope)
+
+]
+\ No newline at end of file