https://github.com/rusith/urd

undo redo pattern for .NET
https://github.com/rusith/urd

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undo redo pattern for .NET

• Host: GitHub
• URL: https://github.com/rusith/urd
• Owner: rusith
• Created: 2015-12-31T15:23:02.000Z (almost 9 years ago)
• Default Branch: master
• Last Pushed: 2017-03-12T11:46:29.000Z (over 7 years ago)
• Last Synced: 2024-04-24T04:15:14.793Z (7 months ago)
• Language: C#
• Homepage:
• Size: 228 KB
• Stars: 5
• Watchers: 2
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# URD

#undo redo pattern for .Net applications

this is a basic undo and redo pattern for .NET applications.

in this pattern when you need an undo / redo able action you will need to warp that action in a using block.

as an example if you going to change a property 

```C#

using (new PropertyChange(Object, "Property", "Property changed "))

{

  Object.Property="new value";

}

```

now the change you made to the "Property" property of the "Object" object is added to a drop out stack and the action can undo and redo any time .

if you want an undoAble list change you can do it using same syntax

```C#

private void AddNewItem(List list,string item,bool undoAble)

{

	using (undoAble?new ListChangeAddElement(list,item,"add new string to the string list"):null) //you can use a condition then you can minimize code

	{

		list.Add(item);

	}

}

```

Removing an Item 

```C#

private void RemoveItem(list,item,bool undoAble)

{

	using(undoAble?new ListChangeRemoveElement(list,item,list.IndexOf(item)," remove "+item+" from the string list"))

	{

		list.Remove(item);

	}

}

```

so on.. (check the code)

benefits of this pattern 

* No need to change existing objects

* Low Memory usage

if you wish to implement your own operation . only thing you need to do is create a class--> extend Change class and implement IUndoAble interface.