wip

Toolkit.Foundation/Activate.cs

@@ -0,0 +1,8 @@
+namespace Toolkit.Foundation;
+
+public record Activate
+{
+    public static ActivateEventArgs<TSender> As<TSender>(TSender sender) => new(sender);
+
+    public static ActivateEventArgs<TSender> As<TSender>() where TSender : new() => new(new TSender());
+}

Toolkit.Foundation/ActivateEventArgs.cs

@@ -0,0 +1,16 @@
+namespace Toolkit.Foundation;
+
+public record ActivateEventArgs<TSender>
+{
+    public TSender? Sender { get; }
+
+    public ActivateEventArgs(TSender sender)
+    {
+        Sender = sender;
+    }
+
+    public ActivateEventArgs()
+    {
+
+    }
+}

Toolkit.Foundation/ConfigurationValueViewModel.cs

@@ -3,106 +3,5 @@ using CommunityToolkit.Mvvm.Messaging;
 
 namespace Toolkit.Foundation;
 
-public partial class ConfigurationValueViewModel<TConfiguration, TValue>(IServiceProvider provider,
-    IServiceFactory factory,
-    IMessenger messenger,
-    IDisposer disposer,
-    TConfiguration configuration,
-    IWritableConfiguration<TConfiguration> writer,
-    Func<TConfiguration, TValue?> read,
-    Action<TValue?, TConfiguration> write) :
-    Observable<TValue>(provider, factory, messenger, disposer),
-    IHandler<ChangedEventArgs<TConfiguration>>
-    where TConfiguration : class
-{
-    public void Handle(ChangedEventArgs<TConfiguration> args)
-    {
-        if (args.Sender is TConfiguration configuration)
-        {
-            Value = read(configuration);
-        }
-    }
 
-    protected override void Activated() => Value = read(configuration);
 
-    protected override void Changed(TValue? value)
-    {
-        if (IsActive)
-        {
-            writer.Write(args => write(value, args));
-        }
-    }
-}
-
-public partial class ConfigurationValueViewModel<TConfiguration, TValue, TItem> :
-    ObservableCollection<TValue, TItem>,
-    IHandler<ChangedEventArgs<TConfiguration>>
-    where TConfiguration : class
-    where TItem : notnull,
-    IDisposable
-{
-    private readonly TConfiguration configuration;
-    private readonly Func<TConfiguration, TValue?> read;
-    private readonly Action<TValue?, TConfiguration> write;
-    private readonly IWritableConfiguration<TConfiguration> writer;
-
-    public ConfigurationValueViewModel(IServiceProvider provider, 
-        IServiceFactory factory,
-        IMessenger messenger,
-        IDisposer disposer,
-        TConfiguration configuration,
-        IWritableConfiguration<TConfiguration> writer,
-        Func<TConfiguration, TValue?> read,
-        Action<TValue?, TConfiguration> write,
-        TValue? value = default) : base(provider, factory, messenger, disposer, value)
-    {
-        this.configuration = configuration;
-        this.writer = writer;
-        this.read = read;
-        this.write = write;
-
-        Value = value;
-    }
-
-    public ConfigurationValueViewModel(IServiceProvider provider, 
-        IServiceFactory factory,
-        IMessenger messenger,
-        IDisposer disposer, 
-        IEnumerable<TItem> items,
-        TConfiguration configuration,
-        IWritableConfiguration<TConfiguration> writer,
-        Func<TConfiguration, TValue?> read,
-        Action<TValue?, TConfiguration> write,
-        TValue? value = default) : base(provider, factory, messenger, disposer, items, value)
-    {
-        this.configuration = configuration;
-        this.writer = writer;
-        this.read = read;
-        this.write = write;
-
-        Value = value;
-    }
-
-    public void Handle(ChangedEventArgs<TConfiguration> args)
-    {
-        if (args.Sender is TConfiguration configuration)
-        {
-            Value = read(configuration);
-        }
-    }
-
-    protected override void Activated()
-    {
-        Value = read(configuration);
-    }
-
-    protected override void OnChanged(TValue? value)
-    {
-        if (IsActive)
-        {
-            writer.Write(args => write(value, args));
-        }
-
-        base.OnChanged(value);
-    }
-}

Toolkit.Foundation/ContentTemplateDescriptor.cs

@@ -3,12 +3,12 @@
 public class ContentTemplateDescriptor(object key,
     Type viewModelType,
     Type viewType,
-    params object[]? parameters) :
+    params object?[]? parameters) :
     IContentTemplateDescriptor
 {
     public object Key => key;
 
-    public object[]? Parameters => parameters;
+    public object?[]? Parameters => parameters;
 
     public Type ContentType => viewModelType;
 

Toolkit.Foundation/Deactivate.cs

@@ -0,0 +1,8 @@
+namespace Toolkit.Foundation;
+
+public record Deactivate
+{
+    public static DeactivateEventArgs<TSender> As<TSender>(TSender sender) => new(sender);
+
+    public static DeactivateEventArgs<TSender> As<TSender>() where TSender : new() => new(new TSender());
+}

Toolkit.Foundation/DeactivateEventArgs.cs

@@ -0,0 +1,16 @@
+namespace Toolkit.Foundation;
+
+public record DeactivateEventArgs<TSender>
+{
+    public TSender? Sender { get; }
+
+    public DeactivateEventArgs(TSender sender)
+    {
+        Sender = sender;
+    }
+
+    public DeactivateEventArgs()
+    {
+
+    }
+}

Toolkit.Foundation/DeactivatedEventArgs.cs

@@ -13,4 +13,4 @@ public record DeactivatedEventArgs<TSender>
     {
 
     }
-}
+}

Toolkit.Foundation/IValidation.cs

@@ -17,7 +17,10 @@ public interface IValidation :
     void Clear();
 
     Task<bool> Validate<TProperty>(Expression<Func<TProperty>> property,
-            ValidationRule[] rules);
+        ValidationRule[] rules);
+
+    Task<bool> Validate(string name,
+        ValidationRule[] rules);
 
     Task<bool> Validate();
 

Toolkit.Foundation/Observable.cs

@@ -127,4 +127,4 @@ public partial class Observable<TKey, TValue> :
     }
 
     partial void OnValueChanged(TValue? value) => ValueChanged();
-}
+}

Toolkit.Foundation/ObservableCollection.cs

@@ -619,7 +619,7 @@ public partial class ObservableCollection<TValue, TViewModel> :
     partial void OnValueChanged(TValue? value) => OnChanged(value);
 }
 
-public partial class ObservableCollection<TViewModel, TKey, TValue> :
+public partial class ObservableCollection<TKey, TValue, TViewModel> :
     ObservableCollection<TViewModel>
     where TViewModel : IDisposable
 {

Toolkit.Foundation/ObservableConfiguration.cs

@@ -0,0 +1,34 @@
+using CommunityToolkit.Mvvm.Messaging;
+
+namespace Toolkit.Foundation;
+
+public partial class ObservableConfiguration<TConfiguration, TValue>(IServiceProvider provider,
+    IServiceFactory factory,
+    IMessenger messenger,
+    IDisposer disposer,
+    TConfiguration configuration,
+    IWritableConfiguration<TConfiguration> writer,
+    Func<TConfiguration, TValue?> read,
+    Action<TValue?, TConfiguration> write) :
+    Observable<TValue>(provider, factory, messenger, disposer),
+    IHandler<ChangedEventArgs<TConfiguration>>
+    where TConfiguration : class
+{
+    public void Handle(ChangedEventArgs<TConfiguration> args)
+    {
+        if (args.Sender is TConfiguration configuration)
+        {
+            Value = read(configuration);
+        }
+    }
+
+    protected override void Activated() => Value = read(configuration);
+
+    protected override void Changed(TValue? value)
+    {
+        if (IsActive)
+        {
+            writer.Write(args => write(value, args));
+        }
+    }
+}

Toolkit.Foundation/ObservableConfigurationCollection.cs

@@ -0,0 +1,76 @@
+using CommunityToolkit.Mvvm.Messaging;
+
+namespace Toolkit.Foundation;
+
+public partial class ObservableConfigurationCollection<TConfiguration, TValue, TViewModel> :
+    ObservableCollection<TValue, TViewModel>,
+    IHandler<ChangedEventArgs<TConfiguration>>
+    where TConfiguration : class
+    where TViewModel : notnull,
+    IDisposable
+{
+    private readonly TConfiguration configuration;
+    private readonly Func<TConfiguration, TValue?> read;
+    private readonly Action<TValue?, TConfiguration> write;
+    private readonly IWritableConfiguration<TConfiguration> writer;
+
+    public ObservableConfigurationCollection(IServiceProvider provider,
+        IServiceFactory factory,
+        IMessenger messenger,
+        IDisposer disposer,
+        TConfiguration configuration,
+        IWritableConfiguration<TConfiguration> writer,
+        Func<TConfiguration, TValue?> read,
+        Action<TValue?, TConfiguration> write,
+        TValue? value = default) : base(provider, factory, messenger, disposer, value)
+    {
+        this.configuration = configuration;
+        this.writer = writer;
+        this.read = read;
+        this.write = write;
+
+        Value = value;
+    }
+
+    public ObservableConfigurationCollection(IServiceProvider provider,
+        IServiceFactory factory,
+        IMessenger messenger,
+        IDisposer disposer,
+        IEnumerable<TViewModel> items,
+        TConfiguration configuration,
+        IWritableConfiguration<TConfiguration> writer,
+        Func<TConfiguration, TValue?> read,
+        Action<TValue?, TConfiguration> write,
+        TValue? value = default) : base(provider, factory, messenger, disposer, items, value)
+    {
+        this.configuration = configuration;
+        this.writer = writer;
+        this.read = read;
+        this.write = write;
+
+        Value = value;
+    }
+
+    public void Handle(ChangedEventArgs<TConfiguration> args)
+    {
+        if (args.Sender is TConfiguration configuration)
+        {
+            Value = read(configuration);
+        }
+    }
+
+    protected override void Activated()
+    {
+        Value = read(configuration);
+    }
+
+    protected override void OnChanged(TValue? value)
+    {
+        if (IsActive)
+        {
+            writer.Write(args => write(value, args));
+        }
+
+        base.OnChanged(value);
+    }
+}

Toolkit.Foundation/Result.cs

@@ -8,26 +8,32 @@ public record Result<TValue> :
     protected internal Result(TValue? value, bool isSuccess, Error error)
         : base(isSuccess, error) => this.value = value;
 
-    public TValue? Value => IsSuccess ? value! : default;
+    public TValue? Value => 
+        IsSuccess ? value! : default;
 
-    public static implicit operator Result<TValue>(TValue? value) => Create(value);
+    public static implicit operator Result<TValue>(TValue? value) => 
+        Create(value);
 }
 
-
-public record Result(bool IsSuccess, Error Error)
+public record Result(bool IsSuccess,
+    Error Error)
 {
     public bool IsFailure => !IsSuccess;
 
     public static Result Success() => new(true, Error.None);
 
-    public static Result<TValue> Success<TValue>(TValue value) => new(value, true, Error.None);
+    public static Result<TValue> Success<TValue>(TValue value) => 
+        new(value, true, Error.None);
 
-    public static Result Failure(Error error) => new(false, error);
+    public static Result Failure(Error error) => 
+        new(false, error);
 
-    public static Result<TValue> Failure<TValue>(Error error) => new(default, false, error);
+    public static Result<TValue> Failure<TValue>(Error error) =>
+        new(default, false, error);
 
-    public static Result Create(bool condition) => condition ? Success() : Failure(Error.ConditionNotMet);
-
-    public static Result<TValue> Create<TValue>(TValue? value) => value is not null ? Success(value) : Failure<TValue>(Error.Null);
+    public static Result Create(bool condition) => 
+        condition ? Success() : Failure(Error.ConditionNotMet);
 
+    public static Result<TValue> Create<TValue>(TValue? value) => 
+        value is not null ? Success(value) : Failure<TValue>(Error.Null);
 }

Toolkit.Foundation/Validation.cs

@@ -3,32 +3,24 @@ using System.Linq.Expressions;
 
 namespace Toolkit.Foundation;
 
-public class Validation(IValidatorCollection validators) :
-    IValidation
+public class Validation(IValidatorCollection validators) : IValidation
 {
     private readonly ValidationErrorCollection errors = [];
 
     public event PropertyChangedEventHandler? PropertyChanged;
 
-    public IReadOnlyIndexDictionary<string, string> Errors => 
+    public IReadOnlyIndexDictionary<string, string> Errors =>
         new ReadOnlyIndexDictionary<string, string>(errors);
 
-    public bool HasErrors =>
-        Errors.Count > 0;
+    public bool HasErrors => Errors.Count > 0;
 
     internal IValidatorCollection Validators { get; } = validators;
 
-    public void Add<TProperty>(Expression<Func<TProperty>> property,
-        ValidationRule[] rules,
-        ValidationTrigger trigger = ValidationTrigger.Deferred)
+    public void Add<TProperty>(Expression<Func<TProperty>> property, ValidationRule[] rules, ValidationTrigger trigger = ValidationTrigger.Deferred)
     {
-        string? name = GetPropertyName(property);
+        string name = GetPropertyName(property);
         Validators.Add(name, new Validator(name, rules));
-
-        if (trigger is ValidationTrigger.Immediate)
-        {
-            _ = Validate(name);
-        }
+        if (trigger == ValidationTrigger.Immediate) _ = Validate(name);
     }
 
     public void Clear()
@@ -37,93 +29,64 @@ public class Validation(IValidatorCollection validators) :
         OnPropertyChanged(nameof(Errors), null, null);
     }
 
-    public virtual void OnPropertyChanged(string propertyName,
-            object? before, object? after)
-    {
-        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
-    }
+    public Task<bool> Validate<TProperty>(Expression<Func<TProperty>> property, ValidationRule[] rules) =>
+        ValidateInternal(new Validator(GetPropertyName(property), rules), GetPropertyName(property));
 
-    public async Task<bool> Validate<TProperty>(Expression<Func<TProperty>> property,
-        ValidationRule[] rules)
-    {
-        string? name = GetPropertyName(property);
-        Validator validator = new(name, rules);
+    public Task<bool> Validate(string name, ValidationRule[] rules) =>
+        ValidateInternal(new Validator(name, rules), name);
 
-        Clear(name);
-
-        (bool isValid, string? message) = await validator.TryValidate();
-
-        if (!isValid)
-        {
-            errors[name] = message ?? "";
-        }
-
-        OnPropertyChanged(nameof(Errors), null, null);
-        OnPropertyChanged(nameof(HasErrors), null, null);
-
-        return !HasErrors;
-    }
-
-    public async Task<bool> Validate(string name)
-    {
-        Clear(name);
-
-        if (Validators.TryGet(name, out Validator? validator))
-        {
-            if (validator is not null)
-            {
-                (bool isValid, string? message) = await validator.TryValidate();
-                if (!isValid)
-                {
-                    errors[name] = message ?? "";
-                }
-            }
-        }
-
-        OnPropertyChanged(nameof(Errors), null, null);
-        OnPropertyChanged(nameof(HasErrors), null, null);
-
-        return !HasErrors;
-    }
+    public Task<bool> Validate(string name) =>
+        Validators.TryGet(name, out var validator) && validator != null
+            ? ValidateInternal(validator, name)
+            : Task.FromResult(true);
 
     public async Task<bool> Validate()
     {
         Clear();
 
-        foreach (Validator? validator in Validators)
+        foreach (var validator in Validators)
         {
             if (validator.PropertyName is string name)
             {
                 (bool isValid, string? message) = await validator.TryValidate();
-                if (!isValid)
-                {
-                    errors[name] = message ?? "";
-                }
+                if (!isValid) errors[name] = message ?? string.Empty;
             }
         }
 
         OnPropertyChanged(nameof(Errors), null, null);
         OnPropertyChanged(nameof(HasErrors), null, null);
-
         return !HasErrors;
     }
 
+    private async Task<bool> ValidateInternal(Validator validator, string name)
+    {
+        Clear(name);
+
+        (bool isValid, string? message) = await validator.TryValidate();
+        if (!isValid) errors[name] = message ?? string.Empty;
+
+        OnPropertyChanged(nameof(Errors), null, null);
+        OnPropertyChanged(nameof(HasErrors), null, null);
+        return isValid;
+    }
+
     private void Clear(string name)
     {
-        if (Errors.ContainsKey(name))
+        if (errors is not null && errors.ContainsKey(name))
         {
             errors.Remove(name);
             OnPropertyChanged(nameof(Errors), null, null);
         }
     }
 
-    private string GetPropertyName<T>(Expression<Func<T>> expression)
-    {
-        return expression.Body switch
+    private static string GetPropertyName<T>(Expression<Func<T>> expression) =>
+        expression.Body switch
         {
             MemberExpression memberExpression => memberExpression.Member.Name,
             UnaryExpression unaryExpression when unaryExpression.Operand is MemberExpression operand => operand.Member.Name,
             _ => string.Empty
         };
-    }
-}
+
+    public virtual void OnPropertyChanged(string propertyName, object? before, object? after) =>
+        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+}

Toolkit.UI.WinUI/IsStringNotNullOrEmptyConverter.cs

@@ -0,0 +1,10 @@
+using System;
+
+namespace Toolkit.UI.WinUI;
+
+public class IsStringNotNullOrEmptyConverter : 
+    ValueConverter<string, bool>
+{
+    protected override bool ConvertTo(string value, Type? targetType, object? parameter, string? language) => 
+        !string.IsNullOrEmpty(value);
+}

Toolkit.UI.WinUI/StringFormatConverter.cs

@@ -4,24 +4,17 @@ using System.Globalization;
 namespace Toolkit.UI.WinUI;
 
 public class StringFormatConverter : 
-    ValueConverter<object, object>
+    ValueConverter<object?, object?>
 {
     public string? StringFormat { get; set; }
 
-    protected override object? ConvertTo(object value, 
+    protected override object? ConvertTo(object? value, 
         Type? targetType,
         object? parameter, 
         string? language)
     {
-        if (value is null)
-        {
-            return null!;
-        }
-
-        if (string.IsNullOrEmpty(StringFormat))
-        {
-            return value.ToString()!;
-        }
+        if (value is null) return null!;
+        if (StringFormat is not { Length: > 0}) return $"{value}"!;
 
         try
         {

Toolkit.UI.WinUI/ValidationBooleanConverter.cs

@@ -0,0 +1,27 @@
+using System;
+using Toolkit.Foundation;
+
+namespace Toolkit.UI.WinUI;
+
+public class ValidationBooleanConverter :
+    ValueConverter<IReadOnlyIndexDictionary<string, string>, bool>
+{
+    public string? Property { get; set; }
+
+    public bool TrueValue { get; set; } = true;
+
+    public bool FalseValue { get; set; } = false;
+
+    protected override bool ConvertTo(IReadOnlyIndexDictionary<string, string> value,
+        Type? targetType,
+        object? parameter,
+        string? language)
+    {
+        if (Property is { Length: > 0 } && value.ContainsKey(Property))
+        {
+            return TrueValue;
+        }
+
+        return FalseValue;
+    }
+}

Toolkit.UI.WinUI/ValidationMessageConverter.cs

@@ -0,0 +1,23 @@
+using System;
+using Toolkit.Foundation;
+
+namespace Toolkit.UI.WinUI;
+
+public class ValidationMessageConverter :
+    ValueConverter<IReadOnlyIndexDictionary<string, string>, string?>
+{
+    public string? Property { get; set; }
+
+    protected override string? ConvertTo(IReadOnlyIndexDictionary<string, string> value,
+        Type? targetType,
+        object? parameter,
+        string? language)
+    {
+        if (Property is { Length: > 0 } && value.TryGetValue(Property, out string? message))
+        {
+            return message;
+        }
+
+        return default;
+    }
+}