Phase 0 (T1-3/4/7/9/11): find bar w/ native Find API + search engine + site zoom + force reload + F11, wired into MainWindow, E2E smoke (39 tests)

VideoDownloader.App/Browser/FindSession.cs

@@ -0,0 +1,126 @@
+using Microsoft.Web.WebView2.Core;
+
+namespace VideoDownloader.App.Browser;
+
+/// <summary>네이티브 Find API 의 최소 추상화(단위 테스트용 fake 교체 가능).</summary>
+public interface IFindApi
+{
+    Task StartAsync(string term, bool caseSensitive, bool matchWord, bool highlightAll);
+    void FindNext();
+    void FindPrevious();
+    void Stop();
+    event EventHandler<int>? MatchCountChanged;
+    event EventHandler<int>? ActiveMatchIndexChanged;
+}
+
+/// <summary>WebView2 네이티브 Find(CoreWebView2.Find) 를 IFindApi 로 감싼 어댑터.
+/// 옵션 객체는 public ctor 가 없어 CoreWebView2Environment.CreateFindOptions() 로 생성.</summary>
+public sealed class WebView2FindApi : IFindApi
+{
+    private readonly CoreWebView2 _cv;
+    private readonly CoreWebView2Environment _env;
+
+    public WebView2FindApi(CoreWebView2 cv, CoreWebView2Environment env)
+    {
+        _cv = cv;
+        _env = env;
+    }
+
+    public Task StartAsync(string term, bool caseSensitive, bool matchWord, bool highlightAll)
+    {
+        var o = _env.CreateFindOptions();
+        o.FindTerm = term;
+        o.IsCaseSensitive = caseSensitive;
+        o.ShouldMatchWord = matchWord;
+        o.ShouldHighlightAllMatches = highlightAll;
+        o.SuppressDefaultFindDialog = true; // 자체 WPF 검색 바 사용
+        return _cv.Find.StartAsync(o);
+    }
+
+    public void FindNext() => _cv.Find.FindNext();
+    public void FindPrevious() => _cv.Find.FindPrevious();
+    public void Stop() => _cv.Find.Stop();
+
+    // 이벤트 인자가 object 로 전달되므로 매치 수는 Find 프로퍼티에서 직접 읽는다.
+    public event EventHandler<int>? MatchCountChanged
+    {
+        add => _cv.Find.MatchCountChanged += (s, _) => value?.Invoke(s, _cv.Find.MatchCount);
+        remove { }
+    }
+
+    public event EventHandler<int>? ActiveMatchIndexChanged
+    {
+        add => _cv.Find.ActiveMatchIndexChanged += (s, _) => value?.Invoke(s, _cv.Find.ActiveMatchIndex);
+        remove { }
+    }
+}
+
+/// <summary>
+/// 페이지 내 검색 세션 상태 머신(T1-3). 용어·매치 수·활성 인덱스를 유지하고
+/// UI(검색 바)가 표시할 "3 / 17" 텍스트를 제공한다.
+/// </summary>
+public sealed class FindSession : IDisposable
+{
+    private readonly IFindApi _api;
+
+    public string Term { get; private set; } = string.Empty;
+    public int MatchCount { get; private set; }
+    public int ActiveMatchIndex { get; private set; }
+    public bool IsCaseSensitive { get; private set; }
+    public bool MatchWholeWord { get; private set; }
+
+    public event Action? StateChanged;
+
+    public FindSession(IFindApi api)
+    {
+        _api = api;
+        _api.MatchCountChanged += (_, n) => { MatchCount = n; StateChanged?.Invoke(); };
+        _api.ActiveMatchIndexChanged += (_, n) => { ActiveMatchIndex = n; StateChanged?.Invoke(); };
+    }
+
+    public string StatusText
+    {
+        get
+        {
+            if (MatchCount <= 0) return "결과 없음";
+            var oneBased = ActiveMatchIndex >= 0 ? ActiveMatchIndex + 1 : 0;
+            return $"{oneBased} / {MatchCount}";
+        }
+    }
+
+    public async Task StartAsync(string term)
+    {
+        Term = term ?? "";
+        if (string.IsNullOrWhiteSpace(term))
+        {
+            Close();
+            return;
+        }
+        MatchCount = 0;
+        ActiveMatchIndex = -1;
+        await _api.StartAsync(Term, IsCaseSensitive, MatchWholeWord, highlightAll: true);
+        StateChanged?.Invoke();
+    }
+
+    public void SetOptions(bool caseSensitive, bool matchWholeWord)
+    {
+        IsCaseSensitive = caseSensitive;
+        MatchWholeWord = matchWholeWord;
+        if (!string.IsNullOrWhiteSpace(Term))
+            _ = StartAsync(Term); // 옵션 변경은 재시작 필요(네이티브 제약)
+    }
+
+    public void Next() => _api.FindNext();
+    public void Previous() => _api.FindPrevious();
+
+    public void Close()
+    {
+        _api.Stop();
+        Term = string.Empty;
+        MatchCount = 0;
+        ActiveMatchIndex = -1;
+        StateChanged?.Invoke();
+    }
+
+    public void Dispose() => Close();
+}