feat: add RelayCommandAttribute and implement it for ViewModel's

Author: davidkallesen

README.md

@@ -28,7 +28,7 @@ This is a base libraries for building WPF application with the MVVM design patte
 
 ## Requirements
 
-[.NET 8 - Desktop Runtime](https://dotnet.microsoft.com/en-us/download/dotnet/8.0)
+[.NET 9 - Desktop Runtime](https://dotnet.microsoft.com/en-us/download/dotnet/9.0)
 
 ## NuGet Packages Provided in this Repository
 
@@ -150,6 +150,16 @@ Therefore run the `Atc.Wpf.Sample` application to explore all the controls and c
 
 - [ValueConverters](src/Atc.Wpf.Theming/ValueConverters/@Readme.md)
 
+### Source Generators
+
+In MVVM, certain attributes help automate boilerplate code using source generators.
+
+Example for ViewModel classes  
+
+![MVVM Source Generation](docs/images/mvvm-source-generated.png)
+
+For more details, see the [MVVM](src/Atc.Wpf/Mvvm/@Readme.md) section.
+
 ## How to contribute
 
 [Contribution Guidelines](https://atc-net.github.io/introduction/about-atc#how-to-contribute)

docs/images/mvvm-source-generated.png

@@ -8,6 +8,7 @@
 global using System.Globalization;
 global using System.IO;
 global using System.Runtime.CompilerServices;
+global using System.Text;
 global using System.Text.Json;
 global using System.Windows;
 global using System.Windows.Controls;

sample/Atc.Wpf.Sample/GlobalUsings.cs

@@ -6,7 +6,7 @@
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:mvvm="clr-namespace:Atc.Wpf.Sample.SamplesWpf.Mvvm"
-    d:DesignHeight="450"
+    d:DesignHeight="550"
     d:DesignWidth="800"
     mc:Ignorable="d">
 
@@ -48,6 +48,14 @@
 
                     <atc:LabelTextInfo LabelText="FullName" Text="{Binding Path=FullName}" />
 
+                    <atc:UniformSpacingPanel
+                        HorizontalAlignment="Center"
+                        HorizontalSpacing="50"
+                        Orientation="Horizontal">
+                        <Button Command="{Binding Path=ShowDataCommand}" Content="Show data" />
+                        <Button Command="{Binding Path=SaveHandlerCommand}" Content="Save data" />
+                    </atc:UniformSpacingPanel>
+
                 </atc:UniformSpacingPanel>
 
             </ScrollViewer>

sample/Atc.Wpf.Sample/SamplesWpf/Mvvm/PersonView.xaml

@@ -25,4 +25,66 @@ public partial class PersonViewModel : ViewModelBase
     private string? myTestProperty;
 
     public string FullName => $"{FirstName} {LastName}";
+
+    [RelayCommand]
+    public void ShowData()
+    {
+        var sb = new StringBuilder();
+        sb.Append("FirstName: ");
+        sb.AppendLine(FirstName);
+        sb.Append("LastName: ");
+        sb.AppendLine(LastName);
+        sb.Append("Age: ");
+        sb.AppendLine(Age.ToString(GlobalizationConstants.EnglishCultureInfo));
+        sb.Append("Email: ");
+        sb.AppendLine(Email);
+        sb.Append("TheProperty: ");
+        sb.AppendLine(TheProperty);
+
+        var dialogBox = new InfoDialogBox(
+            Application.Current.MainWindow!,
+            new DialogBoxSettings(DialogBoxType.Ok)
+            {
+                Height = 300,
+            },
+            sb.ToString());
+
+        dialogBox.ShowDialog();
+    }
+
+    [RelayCommand(CanExecute = nameof(CanSaveHandler))]
+    public void SaveHandler()
+    {
+        var dialogBox = new InfoDialogBox(
+            Application.Current.MainWindow!,
+            new DialogBoxSettings(DialogBoxType.Ok),
+            "Hallo to SaveHandler method");
+
+        dialogBox.Show();
+    }
+
+    public bool CanSaveHandler()
+    {
+        if (string.IsNullOrWhiteSpace(FirstName))
+        {
+            return false;
+        }
+
+        if (string.IsNullOrWhiteSpace(LastName))
+        {
+            return false;
+        }
+
+        if (Age is < 18 or > 120)
+        {
+            return false;
+        }
+
+        if (Email is not null && !Email.IsEmailAddress())
+        {
+            return false;
+        }
+
+        return true;
+    }
 }