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Added memento pattern
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‎src/SoftwarePatterns.Core/Momento/IMemento.cs‎

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namespace SoftwarePatterns.Core.Momento
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{
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public interface IMemento
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{
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object State { get; set; }
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}
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public class InkCanvasMemeto : IMemento
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{
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public object State { get; set; }
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}
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}

‎src/SoftwarePatterns.Core/Momento/ReadMe.txt‎

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Define:
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Without violating encapsulation, capture and externalize an object's internal state allowing the object to be restored to this state later. Yes No N/A
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Usage:
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For rollback undo
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Provide access to object internal state without violating encapsulation.
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Structure:
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In the memento pattern the is the originator the object we wish to track the memento the object that holds its state and the caretaker that maintains the memento.
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Example:
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A simple wpf drawing application with undo feature.

‎src/SoftwarePatterns.Core/SoftwarePatterns.Core.csproj‎

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<Compile Include="Mediator\AircraftController.cs" />
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<Compile Include="Mediator\Boeing747.cs" />
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<Compile Include="Mediator\IAircraft.cs" />
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<Compile Include="Momento\IMemento.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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</ItemGroup>
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<ItemGroup>
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<Content Include="Iterator\ReadMe.txt" />
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<Content Include="LazyLoad\ReadMe.txt" />
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<Content Include="Mediator\ReadMe.txt" />
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<Content Include="Momento\ReadMe.txt" />
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<Content Include="PatternList.txt" />
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</ItemGroup>
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<ItemGroup />
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

‎src/SoftwarePatterns.WPF/App.config‎

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<?xml version="1.0" encoding="utf-8" ?>
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<configuration>
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<startup>
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<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
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</startup>
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</configuration>

‎src/SoftwarePatterns.WPF/App.xaml‎

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<Application x:Class="SoftwarePatterns.WPF.App"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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StartupUri="MainWindow.xaml">
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<Application.Resources>
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</Application.Resources>
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</Application>

‎src/SoftwarePatterns.WPF/App.xaml.cs‎

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using System;
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using System.Collections.Generic;
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using System.Configuration;
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using System.Data;
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using System.Linq;
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using System.Threading.Tasks;
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using System.Windows;
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namespace SoftwarePatterns.WPF
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{
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/// <summary>
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/// Interaction logic for App.xaml
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/// </summary>
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public partial class App : Application
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{
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}
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}

‎src/SoftwarePatterns.WPF/MainWindow.xaml‎

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<Window x:Class="SoftwarePatterns.WPF.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:wpf="clr-namespace:SoftwarePatterns.WPF"
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Title="MainWindow" Height="350" Width="525">
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<Grid>
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<wpf:InkCanvasWithUndo Height="auto" HorizontalAlignment="Left" Margin="10,10,0,0" x:Name="Canvas1" VerticalAlignment="Top" Width="auto"></wpf:InkCanvasWithUndo>
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<Label Content="Label" Name="Label1" HorizontalAlignment="Left" Margin="10,267,0,0" VerticalAlignment="Top" Width="188" Height="52"/>
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</Grid>
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</Window>

‎src/SoftwarePatterns.WPF/MainWindow.xaml.cs‎

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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Ink;
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using System.Windows.Input;
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using SoftwarePatterns.Core.Momento;
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namespace SoftwarePatterns.WPF
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{
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/// <summary>
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/// Interaction logic for MainWindow.xaml
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/// </summary>
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public partial class MainWindow : Window
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{
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private readonly Stack<IMemento> priorStates = new Stack<IMemento>();
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public MainWindow()
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{
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InitializeComponent();
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CommandBindings.Add(new CommandBinding(ApplicationCommands.Undo,
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OnExectedCommands));
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Canvas1.MouseUp += Canvas1OnMouseUp;
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StoreState();
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}
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private void Canvas1OnMouseUp(object sender, MouseButtonEventArgs mouseButtonEventArgs)
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{
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StoreState();
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}
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private void OnExectedCommands(object sender, ExecutedRoutedEventArgs e)
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{
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var window = (MainWindow) sender;
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if (e.Command == ApplicationCommands.Undo)
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{
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window.Undo(sender, e);
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}
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}
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private void Undo(object sender, ExecutedRoutedEventArgs executedRoutedEventArgs)
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{
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if (priorStates.Count > 1)
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{
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priorStates.Pop();
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var lastState = priorStates.Peek();
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Canvas1.SetMemento(lastState);
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}
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Label1.Content = priorStates.Count;
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}
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private void StoreState()
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{
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var memento = Canvas1.CreateMemento();
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priorStates.Push(memento);
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Label1.Content = priorStates.Count;
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}
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}
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public class InkCanvasWithUndo : InkCanvas
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{
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public IMemento CreateMemento()
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{
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var copy = Strokes.ToArray();
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return new InkCanvasMemeto { State = copy };
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}
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public void SetMemento(IMemento memento)
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{
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Strokes = new StrokeCollection((Stroke[])memento.State);
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}
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}
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}

‎src/SoftwarePatterns.WPF/Properties/AssemblyInfo.cs‎

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using System.Reflection;
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using System.Resources;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Windows;
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// General Information about an assembly is controlled through the following
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// set of attributes. Change these attribute values to modify the information
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// associated with an assembly.
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[assembly: AssemblyTitle("SoftwarePatterns.WPF")]
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[assembly: AssemblyDescription("")]
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[assembly: AssemblyConfiguration("")]
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[assembly: AssemblyCompany("")]
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[assembly: AssemblyProduct("SoftwarePatterns.WPF")]
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[assembly: AssemblyCopyright("Copyright © 2013")]
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[assembly: AssemblyTrademark("")]
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[assembly: AssemblyCulture("")]
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// Setting ComVisible to false makes the types in this assembly not visible
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// to COM components. If you need to access a type in this assembly from
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// COM, set the ComVisible attribute to true on that type.
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[assembly: ComVisible(false)]
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//In order to begin building localizable applications, set
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//<UICulture>CultureYouAreCodingWith</UICulture> in your .csproj file
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//inside a <PropertyGroup>. For example, if you are using US english
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//in your source files, set the <UICulture> to en-US. Then uncomment
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//the NeutralResourceLanguage attribute below. Update the "en-US" in
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//the line below to match the UICulture setting in the project file.
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//[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
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[assembly: ThemeInfo(
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ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
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//(used if a resource is not found in the page,
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// or application resource dictionaries)
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ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
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//(used if a resource is not found in the page,
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// app, or any theme specific resource dictionaries)
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)]
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// Version information for an assembly consists of the following four values:
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//
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// Major Version
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// Minor Version
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// Build Number
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// Revision
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//
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// You can specify all the values or you can default the Build and Revision Numbers
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// by using the '*' as shown below:
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// [assembly: AssemblyVersion("1.0.*")]
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[assembly: AssemblyVersion("1.0.0.0")]
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[assembly: AssemblyFileVersion("1.0.0.0")]

‎src/SoftwarePatterns.WPF/Properties/Resources.Designer.cs‎

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