chore: import upstream snapshot with attribution

dotnet/samples/02-agents/Harness/ConsoleReactiveFramework/ConsoleReactiveComponent.cs

@@ -0,0 +1,144 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+namespace Harness.ConsoleReactiveFramework;
+
+/// <summary>
+/// Abstract base class for all console UI components. Provides access to layout
+/// through <see cref="BaseProps"/> and a <see cref="Render"/> method for drawing to the console.
+/// Derive from <see cref="ConsoleReactiveComponent{TProps, TState}"/> instead of this class directly.
+/// </summary>
+public abstract class ConsoleReactiveComponent
+{
+    internal ConsoleReactiveComponent()
+    {
+    }
+
+    /// <summary>
+    /// Gets the shared render lock across all component types to prevent ANSI escape sequence interleaving.
+    /// </summary>
+    protected static object RenderLock { get; } = new();
+
+    /// <summary>
+    /// Gets or sets the component's props as the base <see cref="ConsoleReactiveProps"/> type.
+    /// Used by parent components to set layout (X, Y, Width, Height) on children without
+    /// knowing the concrete props type.
+    /// </summary>
+    public abstract ConsoleReactiveProps? BaseProps { get; set; }
+
+    /// <summary>Renders the component to the console at its current position.</summary>
+    public abstract void Render();
+
+    /// <summary>
+    /// Invalidates the component's cached render state, causing the next <see cref="Render"/> call
+    /// to proceed even if props and state have not changed. Use after a screen erase to force repaint.
+    /// </summary>
+    public abstract void Invalidate();
+}
+
+/// <summary>
+/// Generic base class for console UI components with typed props and state.
+/// Props represent externally supplied configuration; state represents internal mutable data.
+/// </summary>
+/// <typeparam name="TProps">The type of the component's props (external configuration).</typeparam>
+/// <typeparam name="TState">The type of the component's internal state.</typeparam>
+public abstract class ConsoleReactiveComponent<TProps, TState> : ConsoleReactiveComponent
+    where TProps : ConsoleReactiveProps
+    where TState : ConsoleReactiveState
+{
+    private TProps? _lastRenderedProps;
+    private TState? _lastRenderedState;
+
+    /// <summary>Gets or sets the component's props (external configuration).</summary>
+    public TProps? Props { get; set; }
+
+    /// <inheritdoc/>
+    public override ConsoleReactiveProps? BaseProps
+    {
+        get => this.Props;
+        set => this.Props = (TProps?)value;
+    }
+
+    /// <summary>Gets or sets the component's internal state.</summary>
+    protected TState? State { get; set; }
+
+    /// <summary>
+    /// Updates the component's state and triggers a re-render.
+    /// </summary>
+    /// <param name="newState">The new state value.</param>
+    public void SetState(TState newState)
+    {
+        this.State = newState;
+        this.Render();
+    }
+
+    /// <summary>
+    /// Renders the component using the current props and state.
+    /// Uses a lock to prevent concurrent renders from multiple sources.
+    /// Skips rendering if neither props nor state have changed since the last render.
+    /// </summary>
+    public override void Render()
+    {
+        lock (RenderLock)
+        {
+            if (this.Props is null)
+            {
+                return;
+            }
+
+            if (EqualityComparer<TProps>.Default.Equals(this.Props, this._lastRenderedProps)
+                && EqualityComparer<TState>.Default.Equals(this.State, this._lastRenderedState))
+            {
+                return;
+            }
+
+            this.RenderCore(this.Props, this.State!);
+
+            this._lastRenderedProps = this.Props;
+            this._lastRenderedState = this.State;
+        }
+    }
+
+    /// <inheritdoc/>
+    public override void Invalidate()
+    {
+        lock (RenderLock)
+        {
+            this._lastRenderedProps = default;
+            this._lastRenderedState = default;
+        }
+    }
+
+    /// <summary>
+    /// Called by <see cref="Render"/> to perform the actual rendering. Override this in derived classes.
+    /// </summary>
+    /// <param name="props">The current props.</param>
+    /// <param name="state">The current state.</param>
+    public abstract void RenderCore(TProps props, TState state);
+}
+
+/// <summary>
+/// Base record for component props. Provides layout properties (position and size)
+/// and an optional <see cref="Children"/> collection for composing child components.
+/// </summary>
+public record ConsoleReactiveProps
+{
+    /// <summary>Gets the 1-based column position of the component.</summary>
+    public int X { get; init; }
+
+    /// <summary>Gets the 1-based row position of the component.</summary>
+    public int Y { get; init; }
+
+    /// <summary>Gets the width of the component in columns.</summary>
+    public int Width { get; init; }
+
+    /// <summary>Gets the height of the component in rows.</summary>
+    public int Height { get; init; }
+
+    /// <summary>Gets the child components to render within this component.</summary>
+    public IReadOnlyList<ConsoleReactiveComponent> Children { get; init; } = [];
+}
+
+/// <summary>
+/// Base record for component state.
+/// </summary>
+public record ConsoleReactiveState;

dotnet/samples/02-agents/Harness/ConsoleReactiveFramework/ConsoleReactiveFramework.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>net10.0</TargetFrameworks>
+
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+</Project>

dotnet/samples/02-agents/Harness/ConsoleReactiveFramework/ConsoleReactiveMemo.cs

@@ -0,0 +1,36 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+namespace Harness.ConsoleReactiveFramework;
+
+/// <summary>
+/// Caches the result of a mapping function and only recomputes when the input changes.
+/// </summary>
+/// <typeparam name="TInput">The type of the input value.</typeparam>
+/// <typeparam name="TOutput">The type of the mapped output value.</typeparam>
+public class ConsoleReactiveMemo<TInput, TOutput>
+{
+    private TInput? _previousInput;
+    private TOutput? _cachedOutput;
+    private bool _hasValue;
+
+    /// <summary>
+    /// Returns the cached output if <paramref name="input"/> equals the previously stored input;
+    /// otherwise invokes <paramref name="mapper"/> to compute and cache a new output.
+    /// </summary>
+    /// <param name="input">The current input value.</param>
+    /// <param name="mapper">A function that maps the input to an output value.</param>
+    /// <returns>The cached or newly computed output.</returns>
+    public TOutput Map(TInput input, Func<TInput, TOutput> mapper)
+    {
+        ArgumentNullException.ThrowIfNull(mapper);
+
+        if (!this._hasValue || !EqualityComparer<TInput>.Default.Equals(input, this._previousInput))
+        {
+            this._previousInput = input;
+            this._cachedOutput = mapper(input);
+            this._hasValue = true;
+        }
+
+        return this._cachedOutput!;
+    }
+}

dotnet/samples/02-agents/Harness/ConsoleReactiveFramework/ConsoleResizeListener.cs

@@ -0,0 +1,83 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+namespace Harness.ConsoleReactiveFramework;
+
+/// <summary>
+/// Event args for console resize events, containing the old and new dimensions.
+/// </summary>
+public class ConsoleResizeEventArgs : EventArgs
+{
+    /// <summary>Gets the previous console width.</summary>
+    public int OldWidth { get; }
+
+    /// <summary>Gets the previous console height.</summary>
+    public int OldHeight { get; }
+
+    /// <summary>Gets the new console width.</summary>
+    public int NewWidth { get; }
+
+    /// <summary>Gets the new console height.</summary>
+    public int NewHeight { get; }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ConsoleResizeEventArgs"/> class.
+    /// </summary>
+    /// <param name="oldWidth">The previous width.</param>
+    /// <param name="oldHeight">The previous height.</param>
+    /// <param name="newWidth">The new width.</param>
+    /// <param name="newHeight">The new height.</param>
+    public ConsoleResizeEventArgs(int oldWidth, int oldHeight, int newWidth, int newHeight)
+    {
+        this.OldWidth = oldWidth;
+        this.OldHeight = oldHeight;
+        this.NewWidth = newWidth;
+        this.NewHeight = newHeight;
+    }
+}
+
+/// <summary>
+/// Singleton that polls console dimensions every 16ms and raises the
+/// <see cref="ConsoleResized"/> event when the window size changes.
+/// </summary>
+public sealed class ConsoleResizeListener
+{
+#pragma warning disable IDE0052 // Remove unread private members
+    private readonly Task _task;
+#pragma warning restore IDE0052 // Remove unread private members
+
+    private int _lastWidth;
+    private int _lastHeight;
+
+    private ConsoleResizeListener()
+    {
+        this._lastWidth = Console.WindowWidth;
+        this._lastHeight = Console.WindowHeight;
+        this._task = this.ListenForResizeAsync();
+    }
+
+    /// <summary>Gets the singleton instance of <see cref="ConsoleResizeListener"/>.</summary>
+    public static ConsoleResizeListener Instance { get; } = new ConsoleResizeListener();
+
+    /// <summary>Raised when the console window is resized.</summary>
+    public event EventHandler<ConsoleResizeEventArgs>? ConsoleResized;
+
+    private async Task ListenForResizeAsync()
+    {
+        while (true)
+        {
+            int currentWidth = Console.WindowWidth;
+            int currentHeight = Console.WindowHeight;
+
+            if (currentWidth != this._lastWidth || currentHeight != this._lastHeight)
+            {
+                int oldWidth = this._lastWidth;
+                int oldHeight = this._lastHeight;
+                this._lastWidth = currentWidth;
+                this._lastHeight = currentHeight;
+                this.ConsoleResized?.Invoke(this, new ConsoleResizeEventArgs(oldWidth, oldHeight, currentWidth, currentHeight));
+            }
+
+            await Task.Delay(16);
+        }
+    }
+}

dotnet/samples/02-agents/Harness/ConsoleReactiveFramework/KeyEventListener.cs

@@ -0,0 +1,57 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+namespace Harness.ConsoleReactiveFramework;
+
+/// <summary>
+/// Event args for key press events, wrapping a <see cref="ConsoleKeyInfo"/>.
+/// </summary>
+public class KeyPressEventArgs : EventArgs
+{
+    /// <summary>Gets the key information for the pressed key.</summary>
+    public ConsoleKeyInfo KeyInfo { get; }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="KeyPressEventArgs"/> class.
+    /// </summary>
+    /// <param name="keyInfo">The key information.</param>
+    public KeyPressEventArgs(ConsoleKeyInfo keyInfo)
+    {
+        this.KeyInfo = keyInfo;
+    }
+}
+
+/// <summary>
+/// Singleton that polls for console key presses every 16ms and raises the
+/// <see cref="KeyPressed"/> event when a key is detected.
+/// </summary>
+public sealed class KeyEventListener
+{
+#pragma warning disable IDE0052 // Remove unread private members
+    private readonly Task _task;
+#pragma warning restore IDE0052 // Remove unread private members
+
+    private KeyEventListener()
+    {
+        this._task = this.ListenForKeyPressesAsync();
+    }
+
+    /// <summary>Gets the singleton instance of <see cref="KeyEventListener"/>.</summary>
+    public static KeyEventListener Instance { get; } = new KeyEventListener();
+
+    /// <summary>Raised when a key is pressed in the console.</summary>
+    public event EventHandler<KeyPressEventArgs>? KeyPressed;
+
+    private async Task ListenForKeyPressesAsync()
+    {
+        while (true)
+        {
+            while (Console.KeyAvailable)
+            {
+                var keyInfo = Console.ReadKey(intercept: true);
+                this.KeyPressed?.Invoke(this, new KeyPressEventArgs(keyInfo));
+            }
+
+            await Task.Delay(16);
+        }
+    }
+}