feat: add overlay layout options

- add configurable overlay sizing and anchors

- support non-capturing overlays and focus handles

- demonstrate overlay options in Example

src/Example/Program.cs

@@ -21,6 +21,7 @@ var statusText = new Text();
 var loader = new Loader(textMeasurer) { Message = "运行中" };
 using var loaderCancellation = new CancellationTokenSource();
 var input = new TinyTUI.Components.Input(textMeasurer) { Prompt = "请输入: " };
+IOverlayHandle? tipHandle = null;
 
 input.OnChanged = value => UpdateStatus(statusText, value, textMeasurer, renderer);
 input.OnSubmitted = value =>
@@ -29,15 +30,46 @@ input.OnSubmitted = value =>
     {
         case "/help":
             AddEvent(eventsText, "Overlay: help opened");
-            runtime.ShowOverlay(new HelpOverlay(runtime, textMeasurer));
+            runtime.ShowOverlay(
+                new HelpOverlay(runtime, textMeasurer),
+                new OverlayOptions
+                {
+                    Width = OverlaySize.Percent(45),
+                    MinWidth = 42,
+                    Anchor = OverlayAnchor.TopRight,
+                    Margin = new OverlayMargin(1),
+                });
+            break;
+        case "/tip":
+            tipHandle?.Hide();
+            tipHandle = runtime.ShowOverlay(
+                new TipOverlay(textMeasurer),
+                OverlayOptions.NonCapturingTooltip());
+            AddEvent(eventsText, "Overlay: non-capturing tip opened");
             break;
         case "/select":
             AddEvent(eventsText, "Overlay: select opened");
-            runtime.ShowOverlay(new SelectOverlay(runtime, message => AddEvent(eventsText, message), textMeasurer));
+            runtime.ShowOverlay(
+                new SelectOverlay(runtime, message => AddEvent(eventsText, message), textMeasurer),
+                new OverlayOptions
+                {
+                    Width = 34,
+                    Anchor = OverlayAnchor.LeftCenter,
+                    Margin = new OverlayMargin(1),
+                    MaxHeight = 9,
+                });
             break;
         case "/edit":
             AddEvent(eventsText, "Overlay: editor opened");
-            runtime.ShowOverlay(new EditorOverlay(runtime, message => AddEvent(eventsText, message), textMeasurer));
+            runtime.ShowOverlay(
+                new EditorOverlay(runtime, message => AddEvent(eventsText, message), textMeasurer),
+                new OverlayOptions
+                {
+                    Width = OverlaySize.Percent(70),
+                    MinWidth = 52,
+                    Anchor = OverlayAnchor.BottomCenter,
+                    Margin = new OverlayMargin(1),
+                });
             break;
         case "":
             AddEvent(eventsText, "Submitted empty input");
@@ -62,6 +94,7 @@ AddAll(
         "操作说明\n" +
         "- 输入文本后 Enter 提交\n" +
         "- /help 打开帮助弹层\n" +
+        "- /tip 打开不抢焦点的右上角提示\n" +
         "- /select 打开可交互选择列表\n" +
         "- /edit 打开需要焦点的多行编辑器\n" +
         "- Esc 退出"),
@@ -169,6 +202,21 @@ file sealed class HelpOverlay(ITuiRuntime runtime, ITextMeasurer textMeasurer) :
     }
 }
 
+file sealed class TipOverlay(ITextMeasurer textMeasurer) : IComponent
+{
+    private readonly Box _box = new(
+        new Text(
+            "这是 non-capturing overlay\n" +
+            "打开后输入框仍然接收键盘输入\n" +
+            "再次输入 /tip 会替换当前提示"),
+        textMeasurer)
+    {
+        Title = "Tip",
+    };
+
+    public IReadOnlyList<string> Render(int width) => _box.Render(width);
+}
+
 file sealed class SelectOverlay : IInputComponent
 {
     private readonly ITuiRuntime _runtime;

src/TinyTUI/Overlay/IOverlayHandle.cs

@@ -14,4 +14,24 @@ public interface IOverlayHandle
     /// 临时切换 overlay 是否参与渲染和焦点处理
     /// </summary>
     void SetHidden(bool hidden);
+
+    /// <summary>
+    /// 获取 overlay 当前是否临时隐藏
+    /// </summary>
+    bool IsHidden { get; }
+
+    /// <summary>
+    /// 将焦点切换到当前 overlay 并提升到视觉最前
+    /// </summary>
+    void Focus();
+
+    /// <summary>
+    /// 释放当前 overlay 的焦点并回到合适的组件
+    /// </summary>
+    void Unfocus();
+
+    /// <summary>
+    /// 获取 overlay 当前是否拥有焦点
+    /// </summary>
+    bool IsFocused { get; }
 }

src/TinyTUI/Overlay/IOverlayManager.cs

@@ -15,7 +15,7 @@ public interface IOverlayManager
     /// <summary>
     /// 显示 overlay 组件并返回控制句柄
     /// </summary>
-    IOverlayHandle Show(IComponent component);
+    IOverlayHandle Show(IComponent component, OverlayOptions? options = null, OverlayHandleCallbacks? callbacks = null);
 
     /// <summary>
     /// 隐藏最上层 overlay

src/TinyTUI/Overlay/OverlayAnchor.cs

@@ -0,0 +1,17 @@
+namespace TinyTUI.Overlay;
+
+/// <summary>
+/// 定义 overlay 相对终端窗口的默认停靠位置
+/// </summary>
+public enum OverlayAnchor
+{
+    Center,
+    TopLeft,
+    TopRight,
+    BottomLeft,
+    BottomRight,
+    TopCenter,
+    BottomCenter,
+    LeftCenter,
+    RightCenter,
+}

src/TinyTUI/Overlay/OverlayHandleCallbacks.cs

@@ -0,0 +1,32 @@
+namespace TinyTUI.Overlay;
+
+/// <summary>
+/// 连接 overlay 句柄操作和运行时焦点恢复逻辑
+/// </summary>
+public sealed class OverlayHandleCallbacks
+{
+    /// <summary>
+    /// 在 overlay 永久移除前触发
+    /// </summary>
+    public Action? Removing { get; init; }
+
+    /// <summary>
+    /// 在 overlay 隐藏状态变化后触发
+    /// </summary>
+    public Action<bool>? HiddenChanged { get; init; }
+
+    /// <summary>
+    /// 请求将焦点切换到当前 overlay
+    /// </summary>
+    public Action? FocusRequested { get; init; }
+
+    /// <summary>
+    /// 请求释放当前 overlay 的焦点
+    /// </summary>
+    public Action? UnfocusRequested { get; init; }
+
+    /// <summary>
+    /// 获取当前 overlay 是否拥有焦点
+    /// </summary>
+    public Func<bool>? IsFocused { get; init; }
+}

src/TinyTUI/Overlay/OverlayManager.cs

@@ -22,20 +22,39 @@ public sealed class OverlayManager(ITextMeasurer? textMeasurer = null) : IOverla
     /// <summary>
     /// 获取最上层可见 overlay 组件
     /// </summary>
-    public IComponent? TopVisibleComponent => _entries.LastOrDefault(static entry => !entry.Hidden)?.Component;
+    public IComponent? TopVisibleComponent => TopVisibleEntry?.Component;
+
+    /// <summary>
+    /// 获取最上层可接收焦点的 overlay 组件
+    /// </summary>
+    public IComponent? TopFocusableComponent => TopFocusableEntry?.Component;
+
+    private OverlayEntry? TopVisibleEntry => _entries
+        .Where(IsVisible)
+        .MaxBy(static entry => entry.FocusOrder);
+
+    private OverlayEntry? TopFocusableEntry => _entries
+        .Where(entry => IsVisible(entry) && !entry.Options.NonCapturing)
+        .MaxBy(static entry => entry.FocusOrder);
+
+    private long _focusOrderCounter;
 
     /// <inheritdoc />
-    public IOverlayHandle Show(IComponent component)
+    public IOverlayHandle Show(IComponent component, OverlayOptions? options = null, OverlayHandleCallbacks? callbacks = null)
     {
-        var entry = new OverlayEntry(component);
+        var entry = new OverlayEntry(component, options ?? new OverlayOptions())
+        {
+            Callbacks = callbacks ?? new OverlayHandleCallbacks(),
+            FocusOrder = ++_focusOrderCounter,
+        };
         _entries.Add(entry);
-        return new OverlayHandle(entry, Remove, SetHidden);
+        return new OverlayHandle(entry, Remove, SetHidden, Focus);
     }
 
     /// <inheritdoc />
     public void HideTop()
     {
-        var top = _entries.LastOrDefault(static entry => !entry.Hidden);
+        var top = TopVisibleEntry;
         if (top is not null) Remove(top);
     }
 
@@ -44,7 +63,10 @@ public sealed class OverlayManager(ITextMeasurer? textMeasurer = null) : IOverla
     /// </summary>
     public IReadOnlyList<string> Compose(IReadOnlyList<string> baseLines, TerminalSize size)
     {
-        var visibleEntries = _entries.Where(static entry => !entry.Hidden).ToArray();
+        foreach (var entry in _entries)
+            entry.LastSize = size;
+
+        var visibleEntries = _entries.Where(IsVisible).OrderBy(static entry => entry.FocusOrder).ToArray();
         if (visibleEntries.Length == 0)
             return baseLines;
 
@@ -53,28 +75,28 @@ public sealed class OverlayManager(ITextMeasurer? textMeasurer = null) : IOverla
             result.Add(string.Empty);
 
         foreach (var entry in visibleEntries)
-            ComposeOne(result, entry.Component, size);
+            ComposeOne(result, entry, size);
 
         return result;
     }
 
     /// <summary>
-    /// 将单个 overlay 组件居中覆盖到目标行集合
+    /// 将单个 overlay 组件按布局配置覆盖到目标行集合
     /// </summary>
-    private void ComposeOne(List<string> target, IComponent component, TerminalSize size)
+    private void ComposeOne(List<string> target, OverlayEntry entry, TerminalSize size)
     {
-        // 当前基础版本固定居中显示 后续可以把宽度和位置抽成 OverlayOptions
-        var overlayWidth = Math.Clamp(Math.Min(60, size.Columns - 4), 1, Math.Max(1, size.Columns));
-        var overlayLines = component.Render(overlayWidth).Select(line => _textMeasurer.Truncate(line, overlayWidth)).ToArray();
-        var overlayHeight = overlayLines.Length;
-        var row = Math.Max(0, (size.Rows - overlayHeight) / 2);
-        var column = Math.Max(0, (size.Columns - overlayWidth) / 2);
+        var initialLayout = ResolveLayout(entry.Options, 0, size);
+        var overlayLines = entry.Component.Render(initialLayout.Width)
+            .Take(initialLayout.MaxHeight ?? int.MaxValue)
+            .Select(line => _textMeasurer.Truncate(line, initialLayout.Width))
+            .ToArray();
+        var layout = ResolveLayout(entry.Options, overlayLines.Length, size);
 
-        while (target.Count < row + overlayHeight)
+        while (target.Count < layout.Row + overlayLines.Length)
             target.Add(string.Empty);
 
         for (var index = 0; index < overlayLines.Length; index++)
-            target[row + index] = ComposeLine(target[row + index], overlayLines[index], column, overlayWidth, size.Columns);
+            target[layout.Row + index] = ComposeLine(target[layout.Row + index], overlayLines[index], layout.Column, layout.Width, size.Columns);
     }
 
     /// <summary>
@@ -98,8 +120,21 @@ public sealed class OverlayManager(ITextMeasurer? textMeasurer = null) : IOverla
     private void SetHidden(OverlayEntry entry, bool hidden)
     {
         if (!_entries.Contains(entry)) return;
+        if (entry.Hidden == hidden) return;
 
         entry.Hidden = hidden;
+        entry.Callbacks.HiddenChanged?.Invoke(hidden);
+    }
+
+    /// <summary>
+    /// 将 overlay 提升到视觉最前并通知 Runtime 切换焦点
+    /// </summary>
+    private void Focus(OverlayEntry entry)
+    {
+        if (!_entries.Contains(entry) || !IsVisible(entry)) return;
+
+        entry.FocusOrder = ++_focusOrderCounter;
+        entry.Callbacks.FocusRequested?.Invoke();
     }
 
     /// <summary>
@@ -109,23 +144,114 @@ public sealed class OverlayManager(ITextMeasurer? textMeasurer = null) : IOverla
     {
         if (!_entries.Remove(entry)) return;
 
+        entry.Callbacks.Removing?.Invoke();
         Removed?.Invoke(this, entry.Component);
     }
 
-    private sealed class OverlayEntry(IComponent component)
+    /// <summary>
+    /// 判断 overlay 是否应该参与当前帧渲染
+    /// </summary>
+    private static bool IsVisible(OverlayEntry entry)
+        => !entry.Hidden && (entry.Options.Visible?.Invoke(entry.LastSize) ?? true);
+
+    /// <summary>
+    /// 计算 overlay 的最终宽度 位置和高度限制
+    /// </summary>
+    private static OverlayLayout ResolveLayout(OverlayOptions options, int overlayHeight, TerminalSize size)
+    {
+        var margin = NormalizeMargin(options.Margin);
+        var availableWidth = Math.Max(1, size.Columns - margin.Left - margin.Right);
+        var availableHeight = Math.Max(1, size.Rows - margin.Top - margin.Bottom);
+        var width = options.Width?.Resolve(size.Columns) ?? Math.Min(60, availableWidth);
+
+        if (options.MinWidth is { } minWidth)
+            width = Math.Max(width, minWidth);
+
+        width = Math.Clamp(width, 1, availableWidth);
+        var maxHeight = options.MaxHeight?.Resolve(size.Rows);
+
+        if (maxHeight is not null)
+            maxHeight = Math.Clamp(maxHeight.Value, 1, availableHeight);
+
+        var effectiveHeight = maxHeight is { } limit ? Math.Min(overlayHeight, limit) : overlayHeight;
+        var row = options.Row is { } rowOption
+            ? ResolvePosition(rowOption, availableHeight, effectiveHeight, margin.Top)
+            : ResolveAnchorRow(options.Anchor, effectiveHeight, availableHeight, margin.Top);
+        var column = options.Column is { } columnOption
+            ? ResolvePosition(columnOption, availableWidth, width, margin.Left)
+            : ResolveAnchorColumn(options.Anchor, width, availableWidth, margin.Left);
+
+        row += options.OffsetY;
+        column += options.OffsetX;
+
+        row = Math.Clamp(row, margin.Top, Math.Max(margin.Top, size.Rows - margin.Bottom - effectiveHeight));
+        column = Math.Clamp(column, margin.Left, Math.Max(margin.Left, size.Columns - margin.Right - width));
+
+        return new OverlayLayout(width, row, column, maxHeight);
+    }
+
+    private static OverlayMargin NormalizeMargin(OverlayMargin margin) => new(
+        Math.Max(0, margin.Top),
+        Math.Max(0, margin.Right),
+        Math.Max(0, margin.Bottom),
+        Math.Max(0, margin.Left));
+
+    private static int ResolvePosition(OverlaySize option, int available, int overlayLength, int marginStart)
+    {
+        if (!option.IsPercent)
+            return option.Value;
+
+        var maxStart = Math.Max(0, available - overlayLength);
+        return marginStart + maxStart * option.Value / 100;
+    }
+
+    private static int ResolveAnchorRow(OverlayAnchor anchor, int height, int availableHeight, int marginTop) => anchor switch
+    {
+        OverlayAnchor.TopLeft or OverlayAnchor.TopCenter or OverlayAnchor.TopRight => marginTop,
+        OverlayAnchor.BottomLeft or OverlayAnchor.BottomCenter or OverlayAnchor.BottomRight => marginTop + availableHeight - height,
+        _ => marginTop + Math.Max(0, availableHeight - height) / 2,
+    };
+
+    private static int ResolveAnchorColumn(OverlayAnchor anchor, int width, int availableWidth, int marginLeft) => anchor switch
+    {
+        OverlayAnchor.TopLeft or OverlayAnchor.LeftCenter or OverlayAnchor.BottomLeft => marginLeft,
+        OverlayAnchor.TopRight or OverlayAnchor.RightCenter or OverlayAnchor.BottomRight => marginLeft + availableWidth - width,
+        _ => marginLeft + Math.Max(0, availableWidth - width) / 2,
+    };
+
+    private sealed class OverlayEntry(IComponent component, OverlayOptions options)
     {
         public IComponent Component { get; } = component;
 
+        public OverlayOptions Options { get; } = options;
+
+        public OverlayHandleCallbacks Callbacks { get; set; } = new();
+
+        public TerminalSize LastSize { get; set; } = new(80, 24);
+
         public bool Hidden { get; set; }
+
+        public long FocusOrder { get; set; }
     }
 
     private sealed class OverlayHandle(
         OverlayEntry entry,
         Action<OverlayEntry> hide,
-        Action<OverlayEntry, bool> setHidden) : IOverlayHandle
+        Action<OverlayEntry, bool> setHidden,
+        Action<OverlayEntry> focus) : IOverlayHandle
     {
+        public bool IsHidden => entry.Hidden;
+
+        public bool IsFocused => entry.Callbacks.IsFocused?.Invoke() ?? false;
+
         public void Hide() => hide(entry);
 
         public void SetHidden(bool hidden) => setHidden(entry, hidden);
+
+        public void Focus() => focus(entry);
+
+        public void Unfocus() => entry.Callbacks.UnfocusRequested?.Invoke();
     }
+
+    private readonly record struct OverlayLayout(int Width, int Row, int Column, int? MaxHeight);
 }

src/TinyTUI/Overlay/OverlayMargin.cs

@@ -0,0 +1,14 @@
+namespace TinyTUI.Overlay;
+
+/// <summary>
+/// 定义 overlay 与终端边缘之间的安全距离
+/// </summary>
+public readonly record struct OverlayMargin(int Top, int Right, int Bottom, int Left)
+{
+    /// <summary>
+    /// 创建四边相同的边距
+    /// </summary>
+    public OverlayMargin(int all) : this(all, all, all, all)
+    {
+    }
+}

src/TinyTUI/Overlay/OverlayOptions.cs

@@ -0,0 +1,74 @@
+using TinyTUI.Components;
+
+namespace TinyTUI.Overlay;
+
+/// <summary>
+/// 控制 overlay 的尺寸 位置 可见性和焦点策略
+/// </summary>
+public sealed class OverlayOptions
+{
+    /// <summary>
+    /// 获取或设置 overlay 宽度
+    /// </summary>
+    public OverlaySize? Width { get; set; }
+
+    /// <summary>
+    /// 获取或设置 overlay 最小宽度
+    /// </summary>
+    public int? MinWidth { get; set; }
+
+    /// <summary>
+    /// 获取或设置 overlay 最大高度
+    /// </summary>
+    public OverlaySize? MaxHeight { get; set; }
+
+    /// <summary>
+    /// 获取或设置 overlay 停靠位置
+    /// </summary>
+    public OverlayAnchor Anchor { get; set; } = OverlayAnchor.Center;
+
+    /// <summary>
+    /// 获取或设置横向偏移
+    /// </summary>
+    public int OffsetX { get; set; }
+
+    /// <summary>
+    /// 获取或设置纵向偏移
+    /// </summary>
+    public int OffsetY { get; set; }
+
+    /// <summary>
+    /// 获取或设置绝对或百分比行位置
+    /// </summary>
+    public OverlaySize? Row { get; set; }
+
+    /// <summary>
+    /// 获取或设置绝对或百分比列位置
+    /// </summary>
+    public OverlaySize? Column { get; set; }
+
+    /// <summary>
+    /// 获取或设置终端边缘边距
+    /// </summary>
+    public OverlayMargin Margin { get; set; }
+
+    /// <summary>
+    /// 获取或设置当前 overlay 是否可见
+    /// </summary>
+    public Func<TerminalSize, bool>? Visible { get; set; }
+
+    /// <summary>
+    /// 获取或设置 overlay 是否不接管键盘焦点
+    /// </summary>
+    public bool NonCapturing { get; set; }
+
+    /// <summary>
+    /// 创建用于帮助信息等非交互提示的 overlay 选项
+    /// </summary>
+    public static OverlayOptions NonCapturingTooltip(OverlayAnchor anchor = OverlayAnchor.TopRight) => new()
+    {
+        Anchor = anchor,
+        Margin = new OverlayMargin(1),
+        NonCapturing = true,
+    };
+}

src/TinyTUI/Overlay/OverlaySize.cs

@@ -0,0 +1,40 @@
+namespace TinyTUI.Overlay;
+
+/// <summary>
+/// 表示 overlay 的绝对尺寸或百分比尺寸
+/// </summary>
+public readonly record struct OverlaySize
+{
+    private OverlaySize(int value, bool isPercent)
+    {
+        Value = value;
+        IsPercent = isPercent;
+    }
+
+    /// <summary>
+    /// 获取尺寸值
+    /// </summary>
+    public int Value { get; }
+
+    /// <summary>
+    /// 获取当前值是否按百分比解释
+    /// </summary>
+    public bool IsPercent { get; }
+
+    /// <summary>
+    /// 创建绝对列数或行数
+    /// </summary>
+    public static OverlaySize Columns(int value) => new(value, false);
+
+    /// <summary>
+    /// 创建百分比尺寸
+    /// </summary>
+    public static OverlaySize Percent(int value) => new(Math.Clamp(value, 0, 100), true);
+
+    /// <summary>
+    /// 根据参考尺寸解析为实际列数或行数
+    /// </summary>
+    public int Resolve(int reference) => IsPercent ? reference * Value / 100 : Value;
+
+    public static implicit operator OverlaySize(int value) => Columns(value);
+}

src/TinyTUI/Runtime/ITuiRuntime.cs

@@ -31,7 +31,7 @@ public interface ITuiRuntime : IDisposable
     /// <summary>
     /// 显示 overlay 组件并切换焦点
     /// </summary>
-    IOverlayHandle ShowOverlay(IComponent component);
+    IOverlayHandle ShowOverlay(IComponent component, OverlayOptions? options = null);
 
     /// <summary>
     /// 隐藏最上层 overlay

src/TinyTUI/Runtime/TuiRuntime.cs

@@ -69,12 +69,25 @@ public sealed class TuiRuntime : ITuiRuntime
     }
 
     /// <inheritdoc />
-    public IOverlayHandle ShowOverlay(IComponent component)
+    public IOverlayHandle ShowOverlay(IComponent component, OverlayOptions? options = null)
     {
         // 记录显示 overlay 前的焦点 关闭 overlay 时恢复用户原来的输入位置
         _overlayFocusRestore[component] = _focusedComponent;
-        var handle = _overlayManager.Show(component);
-        SetFocus(component);
+        var overlayOptions = options ?? new OverlayOptions();
+        var handle = _overlayManager.Show(
+            component,
+            overlayOptions,
+            new OverlayHandleCallbacks
+            {
+                HiddenChanged = hidden => OnOverlayHiddenChanged(component, overlayOptions, hidden),
+                FocusRequested = () => SetOverlayFocus(component),
+                UnfocusRequested = () => RestoreOverlayFocus(component),
+                IsFocused = () => _focusedComponent == component,
+            });
+
+        if (!overlayOptions.NonCapturing)
+            SetOverlayFocus(component);
+
         RequestRender();
         return handle;
     }
@@ -138,11 +151,46 @@ public sealed class TuiRuntime : ITuiRuntime
     /// </summary>
     private void OnOverlayRemoved(object? sender, IComponent component)
     {
-        _overlayFocusRestore.Remove(component, out var restoreFocus);
-
-        if (_focusedComponent == component)
-            _focusedComponent = _overlayManager.TopVisibleComponent ?? restoreFocus;
+        RestoreOverlayFocus(component, removeRestoreEntry: true);
 
         RequestRender();
     }
+
+    /// <summary>
+    /// 在 overlay 临时隐藏或恢复显示时同步焦点
+    /// </summary>
+    private void OnOverlayHiddenChanged(IComponent component, OverlayOptions options, bool hidden)
+    {
+        if (hidden)
+            RestoreOverlayFocus(component);
+        else if (!options.NonCapturing)
+            SetOverlayFocus(component);
+
+        RequestRender();
+    }
+
+    /// <summary>
+    /// 将焦点切到 overlay 并保留进入 overlay 前的恢复目标
+    /// </summary>
+    private void SetOverlayFocus(IComponent component)
+    {
+        _overlayFocusRestore.TryAdd(component, _focusedComponent);
+        SetFocus(component);
+    }
+
+    /// <summary>
+    /// 根据 overlay 栈和进入前焦点恢复输入目标
+    /// </summary>
+    private void RestoreOverlayFocus(IComponent component, bool removeRestoreEntry = false)
+    {
+        IComponent? restoreFocus;
+
+        if (removeRestoreEntry)
+            _overlayFocusRestore.Remove(component, out restoreFocus);
+        else
+            _overlayFocusRestore.TryGetValue(component, out restoreFocus);
+
+        if (_focusedComponent == component)
+            _focusedComponent = _overlayManager.TopFocusableComponent ?? restoreFocus;
+    }
 }