wip

Toolkit.UI.WinUI/ComparisonCondition.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.Xaml.Interactions.Core;
+using Toolkit.Foundation;
+
+namespace Toolkit.UI.WinUI;
+
+public class ComparisonCondition :
+    DependencyObject,
+    ICondition
+{
+    public static readonly DependencyProperty LeftOperandProperty =
+        DependencyProperty.Register(nameof(LeftOperand),
+            typeof(object), typeof(ComparisonCondition),
+            new PropertyMetadata(null));
+
+    public static readonly DependencyProperty OperatorProperty =
+        DependencyProperty.Register(nameof(Operator),
+            typeof(ComparisonConditionType), typeof(ComparisonCondition),
+            new PropertyMetadata(null));
+
+    public static readonly DependencyProperty RightOperandProperty =
+        DependencyProperty.Register(nameof(RightOperand),
+            typeof(object), typeof(ComparisonCondition),
+            new PropertyMetadata(null));
+
+    public object LeftOperand
+    {
+        get => GetValue(LeftOperandProperty);
+        set => SetValue(LeftOperandProperty, value);
+    }
+
+    public object RightOperand
+    {
+        get => GetValue(RightOperandProperty);
+        set => SetValue(RightOperandProperty, value);
+    }
+
+    public ComparisonConditionType Operator
+    {
+        get => (ComparisonConditionType)GetValue(OperatorProperty);
+        set => SetValue(OperatorProperty, value);
+    }
+
+    public bool Evaluate() =>
+        ComparisonLogic.Evaluate(LeftOperand, Operator, RightOperand);
+}

Toolkit.UI.WinUI/ComparisonLogic.cs

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+using Microsoft.Xaml.Interactions.Core;
+using System;
+using System.ComponentModel;
+using System.Globalization;
+
+namespace Toolkit.UI.WinUI;
+
+internal static class ComparisonLogic
+{
+    internal static bool Evaluate(object leftOperand,
+        ComparisonConditionType operatorType,
+        object? rightOperand)
+    {
+        bool result = false;
+
+        if (leftOperand != null)
+        {
+            Type leftType = leftOperand.GetType();
+
+            if (rightOperand != null)
+            {
+                TypeConverter typeConverter = TypeDescriptor.GetConverter(leftType);
+                rightOperand = typeConverter.ConvertFrom(rightOperand);
+            }
+        }
+
+        if (leftOperand is IComparable leftComparableOperand &&
+            rightOperand is IComparable rightComparableOperand)
+        {
+            return EvaluateComparable(leftComparableOperand, operatorType, rightComparableOperand);
+        }
+
+        switch (operatorType)
+        {
+            case ComparisonConditionType.Equal:
+                result = Equals(leftOperand, rightOperand);
+                break;
+
+            case ComparisonConditionType.NotEqual:
+                result = !Equals(leftOperand, rightOperand);
+                break;
+        }
+        return result;
+    }
+
+    private static bool EvaluateComparable(IComparable leftOperand,
+        ComparisonConditionType operatorType,
+        IComparable rightOperand)
+    {
+        object? convertedOperand = null;
+
+        try
+        {
+            convertedOperand = Convert.ChangeType(rightOperand, leftOperand.GetType(), CultureInfo.CurrentCulture);
+        }
+        catch (FormatException)
+        {
+        }
+        catch (InvalidCastException)
+        {
+        }
+
+        if (convertedOperand == null)
+        {
+            return operatorType == ComparisonConditionType.NotEqual;
+        }
+
+        int comparison = leftOperand.CompareTo((IComparable)convertedOperand);
+        bool result = false;
+
+        switch (operatorType)
+        {
+            case ComparisonConditionType.Equal:
+                result = comparison == 0;
+                break;
+
+            case ComparisonConditionType.GreaterThan:
+                result = comparison > 0;
+                break;
+
+            case ComparisonConditionType.GreaterThanOrEqual:
+                result = comparison >= 0;
+                break;
+
+            case ComparisonConditionType.LessThan:
+                result = comparison < 0;
+                break;
+
+            case ComparisonConditionType.LessThanOrEqual:
+                result = comparison <= 0;
+                break;
+
+            case ComparisonConditionType.NotEqual:
+                result = comparison != 0;
+                break;
+        }
+
+        return result;
+    }
+}

Toolkit.UI.WinUI/ConditionAction.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Markup;
+using Microsoft.Xaml.Interactivity;
+using Toolkit.Foundation;
+
+namespace Toolkit.UI.WinUI;
+
+[ContentProperty(Name = nameof(Actions))]
+public class ConditionAction :
+    DependencyObject,
+    IAction
+{
+    public static readonly DependencyProperty ActionsProperty =
+        DependencyProperty.Register(nameof(Actions),
+            typeof(ActionCollection), typeof(ConditionAction),
+            new PropertyMetadata(null));
+
+    public static readonly DependencyProperty ConditionProperty =
+        DependencyProperty.Register(nameof(Condition),
+            typeof(ICondition), typeof(ConditionAction),
+            new PropertyMetadata(null));
+
+    private ActionCollection? actions;
+
+    public ActionCollection Actions => actions ??= [];
+
+    public ICondition? Condition
+    {
+        get => (ICondition?)GetValue(ConditionProperty);
+        set => SetValue(ConditionProperty, value);
+    }
+
+    public object? Execute(object? sender, object? parameter)
+    {
+        if (Condition?.Evaluate() == true)
+        {
+            Interaction.ExecuteActions(sender, Actions, parameter);
+        }
+
+        return true;
+    }
+}

Toolkit.UI.WinUI/ConditionCollection.cs

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+using System.Collections.ObjectModel;
+
+namespace Toolkit.UI.WinUI;
+
+public class ConditionCollection :
+      ObservableCollection<ComparisonCondition>
+{
+}

Toolkit.UI.WinUI/ConditionalExpression.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Markup;
+using Toolkit.Foundation;
+
+namespace Toolkit.UI.WinUI;
+
+[ContentProperty(Name = nameof(Conditions))]
+public class ConditionalExpression :
+    DependencyObject,
+    ICondition
+{
+    public static readonly DependencyProperty ConditionsProperty =
+        DependencyProperty.Register(nameof(Conditions),
+            typeof(ConditionCollection), typeof(ConditionalExpression),
+            new PropertyMetadata(new ConditionCollection()));
+
+    public static readonly DependencyProperty ForwardChainingProperty =
+        DependencyProperty.Register(nameof(ForwardChaining),
+            typeof(ForwardChaining), typeof(ConditionalExpression),
+            new PropertyMetadata(ForwardChaining.And));
+
+    public ConditionalExpression()
+    {
+        SetValue(ConditionsProperty, new ConditionCollection());
+    }
+
+    public ConditionCollection Conditions =>
+        (ConditionCollection)GetValue(ConditionsProperty);
+
+    public ForwardChaining ForwardChaining
+    {
+        get => (ForwardChaining)GetValue(ForwardChainingProperty);
+        set => SetValue(ForwardChainingProperty, value);
+    }
+
+    public bool Evaluate()
+    {
+        bool result = false;
+        foreach (var operation in Conditions)
+        {
+            result = operation.Evaluate();
+
+            if (!result && ForwardChaining == ForwardChaining.And)
+            {
+                return false;
+            }
+
+            if (result && ForwardChaining == ForwardChaining.Or)
+            {
+                return true;
+            }
+        }
+
+        return result;
+    }
+}