step-8 Operations

* Adding an OperationManager to a Context
* adding undoable Operations to the Context's OperationManager from
within a CommandHandler

Author: robsilv

src/helloWorld/commandHandlers/AddStringCommandHandler.as

@@ -1,5 +1,6 @@
 package helloWorld.commandHandlers
 {
+	import core.app.operations.AddItemOperation;
 	import core.appEx.core.commandHandlers.ICommandHandler;
 	import core.editor.CoreEditor;
 
@@ -15,8 +16,9 @@ package helloWorld.commandHandlers
 		{
 			var context:StringListContext = CoreEditor.contextManager.getLatestContextOfType(StringListContext);
 
-			var length:int = context.dataProvider.length;
-			context.dataProvider.addItem("Item " + (length+1));
+			var item:String = "Item " + (context.dataProvider.length+1);
+			var addItemOperation:AddItemOperation = new AddItemOperation( item, context.dataProvider );
+			context.operationManager.addOperation(addItemOperation);
 		}
 	}
 }

src/helloWorld/contexts/StringListContext.as

@@ -2,27 +2,29 @@ package helloWorld.contexts
 {
 	import flash.display.DisplayObject;
 
+	import core.appEx.core.contexts.IOperationManagerContext;
 	import core.appEx.core.contexts.IVisualContext;
+	import core.appEx.managers.OperationManager;
 	import core.data.ArrayCollection;
 
 	import helloWorld.ui.views.StringListView;
 
-	public class StringListContext implements IVisualContext
+	public class StringListContext implements IVisualContext, IOperationManagerContext
 	{
 		private var _view       :StringListView;
 
 		private var _dataProvider   :ArrayCollection;
 
+		private var _operationManager   :OperationManager;
+		
 		public function StringListContext()
 		{
 			_view = new StringListView();
 
 			_dataProvider = new ArrayCollection();
-			_dataProvider.addItem( "Item 1" );
-			_dataProvider.addItem( "Item 2" );
-			_dataProvider.addItem( "Item 3" );
-			
 			_view.dataProvider = _dataProvider;
+			
+			_operationManager = new OperationManager();
 		}
 
 		public function get view():DisplayObject
@@ -32,9 +34,11 @@ package helloWorld.contexts
 
 		public function dispose():void
 		{
-			
+			_operationManager.dispose();
 		}
 
 		public function get dataProvider():ArrayCollection { return _dataProvider; }
+		
+		public function get operationManager():OperationManager { return _operationManager; }
 	}
 }