feat: improve editor interactions

- add editor history, word navigation, and undo redo

- preserve overlay cursor focus when editor is open

- demonstrate editor shortcuts in Example

src/Example/Program.cs

@@ -18,6 +18,7 @@ using var runtime = new TuiRuntime(terminalInput, parser, renderer);
 var done = new ManualResetEventSlim();
 var eventsText = new Text("最近事件:\n- 无");
 var statusText = new Text();
+var editorHistory = new List<string> { "history: first command", "history: second command" };
 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: " };
@@ -62,7 +63,7 @@ input.OnSubmitted = value =>
         case "/edit":
             AddEvent(eventsText, "Overlay: editor opened");
             runtime.ShowOverlay(
-                new EditorOverlay(runtime, message => AddEvent(eventsText, message), textMeasurer),
+                new EditorOverlay(runtime, editorHistory, message => AddEvent(eventsText, message), textMeasurer),
                 new OverlayOptions
                 {
                     Width = OverlaySize.Percent(70),
@@ -247,21 +248,40 @@ file sealed class SelectOverlay : IInputComponent
 file sealed class EditorOverlay : IInputComponent
 {
     private readonly ITuiRuntime _runtime;
+    private readonly List<string> _history;
     private readonly Action<string> _addEvent;
     private readonly Editor _editor;
     private readonly Box _box;
 
-    public EditorOverlay(ITuiRuntime runtime, Action<string> addEvent, ITextMeasurer textMeasurer)
+    public EditorOverlay(ITuiRuntime runtime, List<string> history, Action<string> addEvent, ITextMeasurer textMeasurer)
     {
         _runtime = runtime;
+        _history = history;
         _addEvent = addEvent;
         _editor = new Editor(textMeasurer)
         {
             Height = 6,
-            Value = "这里可以输入多行文本\nEnter 换行 Esc 提交并关闭",
+            Placeholder = "在这里输入内容",
             OnCanceled = SubmitAndClose,
         };
-        _box = new Box(_editor, textMeasurer) { Title = "Editor" };
+        _editor.SetHistory(_history);
+        _box = new Box(
+            new Container
+            {
+                Children =
+                {
+                    new Text(
+                        "Ctrl+A/E 行首行尾 Ctrl+Left/Right 按词移动\n" +
+                        "Ctrl+Backspace/Delete 按词删除 Ctrl+Z/Y 撤销重做\n" +
+                        "空内容时 Up/Down 浏览历史 Esc 提交并关闭"),
+                    new Text(),
+                    _editor,
+                },
+            },
+            textMeasurer)
+        {
+            Title = "Editor",
+        };
     }
 
     public IReadOnlyList<string> Render(int width) => _box.Render(width);
@@ -279,6 +299,13 @@ file sealed class EditorOverlay : IInputComponent
 
     private void SubmitAndClose()
     {
+        var value = _editor.Value.Trim();
+        if (value.Length > 0)
+        {
+            _history.Remove(value);
+            _history.Insert(0, value);
+        }
+
         _addEvent($"Edited {Math.Max(1, _editor.Value.Split('\n').Length)} line(s)");
         _runtime.HideOverlay();
     }