[Phase52] PreviewWindow.xaml.cs 분리 — Content.cs 추출

- PreviewWindow.xaml.cs: 505 → 317줄 (P/Invoke + 싱글턴 + 탭 관리 유지)
- PreviewWindow.Content.cs (신규): 콘텐츠 로드(LoadContent/LoadCsvContent/ParseCsvLine)
  + 타이틀바 핸들러 9개 (170줄)

빌드: 경고 0, 오류 0

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/AxCopilot/Views/PreviewWindow.Content.cs

@@ -0,0 +1,203 @@
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.IO;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
+using System.Windows.Media;
+
+namespace AxCopilot.Views;
+
+public partial class PreviewWindow
+{
+    // ─── 콘텐츠 로드 + 타이틀 바 ─────────────────────────────────────────────
+
+    private async void LoadContent(string filePath)
+    {
+        var ext = Path.GetExtension(filePath).ToLowerInvariant();
+
+        PreviewBrowser.Visibility = Visibility.Collapsed;
+        TextScroll.Visibility = Visibility.Collapsed;
+        DataGridContent.Visibility = Visibility.Collapsed;
+        EmptyMessage.Visibility = Visibility.Collapsed;
+
+        if (!File.Exists(filePath))
+        {
+            EmptyMessage.Text = "파일을 찾을 수 없습니다";
+            EmptyMessage.Visibility = Visibility.Visible;
+            return;
+        }
+
+        try
+        {
+            switch (ext)
+            {
+                case ".html":
+                case ".htm":
+                    if (!_webViewInitialized) return; // OnLoaded에서 재시도
+                    PreviewBrowser.Source = new Uri(filePath);
+                    PreviewBrowser.Visibility = Visibility.Visible;
+                    break;
+
+                case ".csv":
+                    LoadCsvContent(filePath);
+                    DataGridContent.Visibility = Visibility.Visible;
+                    break;
+
+                case ".md":
+                    if (!_webViewInitialized) return;
+                    var mdText = File.ReadAllText(filePath);
+                    if (mdText.Length > 50000) mdText = mdText[..50000];
+                    var mdHtml = Services.Agent.TemplateService.RenderMarkdownToHtml(
+                        mdText, _selectedMood ?? "modern");
+                    PreviewBrowser.NavigateToString(mdHtml);
+                    PreviewBrowser.Visibility = Visibility.Visible;
+                    break;
+
+                case ".txt":
+                case ".json":
+                case ".xml":
+                case ".log":
+                    var text = File.ReadAllText(filePath);
+                    if (text.Length > 50000) text = text[..50000] + "\n\n... (이후 생략)";
+                    TextContent.Text = text;
+                    TextScroll.Visibility = Visibility.Visible;
+                    break;
+
+                default:
+                    EmptyMessage.Text = "미리보기할 수 없는 파일 형식입니다";
+                    EmptyMessage.Visibility = Visibility.Visible;
+                    break;
+            }
+        }
+        catch (Exception ex)
+        {
+            TextContent.Text = $"미리보기 오류: {ex.Message}";
+            TextScroll.Visibility = Visibility.Visible;
+        }
+
+        await System.Threading.Tasks.Task.CompletedTask; // async 경고 방지
+    }
+
+    private void LoadCsvContent(string filePath)
+    {
+        var lines = File.ReadAllLines(filePath);
+        if (lines.Length == 0) return;
+
+        var dt = new DataTable();
+        var headers = ParseCsvLine(lines[0]);
+        foreach (var h in headers)
+            dt.Columns.Add(h);
+
+        var maxRows = Math.Min(lines.Length, 501);
+        for (int i = 1; i < maxRows; i++)
+        {
+            var vals = ParseCsvLine(lines[i]);
+            var row = dt.NewRow();
+            for (int j = 0; j < Math.Min(vals.Length, headers.Length); j++)
+                row[j] = vals[j];
+            dt.Rows.Add(row);
+        }
+
+        DataGridContent.ItemsSource = dt.DefaultView;
+    }
+
+    private static string[] ParseCsvLine(string line)
+    {
+        var fields = new List<string>();
+        var current = new StringBuilder();
+        bool inQuotes = false;
+
+        for (int i = 0; i < line.Length; i++)
+        {
+            char c = line[i];
+            if (inQuotes)
+            {
+                if (c == '"' && i + 1 < line.Length && line[i + 1] == '"')
+                { current.Append('"'); i++; }
+                else if (c == '"') inQuotes = false;
+                else current.Append(c);
+            }
+            else
+            {
+                if (c == '"') inQuotes = true;
+                else if (c == ',') { fields.Add(current.ToString()); current.Clear(); }
+                else current.Append(c);
+            }
+        }
+        fields.Add(current.ToString());
+        return fields.ToArray();
+    }
+
+    // ─── 타이틀 바 ──────────────────────────────────────────────
+
+    private void TitleBar_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
+    {
+        if (e.ClickCount == 2) { ToggleMaximize(); return; }
+        DragMove();
+    }
+
+    private void OpenExternalBtn_Click(object sender, MouseButtonEventArgs e)
+    {
+        e.Handled = true;
+        if (_activeTab == null || !File.Exists(_activeTab)) return;
+        try
+        {
+            System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo
+            {
+                FileName = _activeTab,
+                UseShellExecute = true,
+            });
+        }
+        catch (Exception ex)
+        {
+            Services.LogService.Warn($"외부 프로그램 열기 실패: {ex.Message}");
+        }
+    }
+
+    private void MinBtn_Click(object sender, MouseButtonEventArgs e)
+    {
+        e.Handled = true;
+        WindowState = WindowState.Minimized;
+    }
+
+    private void MaxBtn_Click(object sender, MouseButtonEventArgs e)
+    {
+        e.Handled = true;
+        ToggleMaximize();
+    }
+
+    private void CloseBtn_Click(object sender, MouseButtonEventArgs e)
+    {
+        e.Handled = true;
+        Close();
+    }
+
+    private void ToggleMaximize()
+    {
+        WindowState = WindowState == WindowState.Maximized
+            ? WindowState.Normal
+            : WindowState.Maximized;
+    }
+
+    private void TitleBtn_Enter(object sender, MouseEventArgs e)
+    {
+        if (sender is Border b)
+            b.Background = TryFindResource("ItemHoverBackground") as Brush
+                           ?? new SolidColorBrush(Color.FromArgb(0x18, 0xFF, 0xFF, 0xFF));
+    }
+
+    private void CloseBtnEnter(object sender, MouseEventArgs e)
+    {
+        if (sender is Border b)
+            b.Background = new SolidColorBrush(Color.FromArgb(0x44, 0xFF, 0x40, 0x40));
+    }
+
+    private void TitleBtn_Leave(object sender, MouseEventArgs e)
+    {
+        if (sender is Border b)
+            b.Background = Brushes.Transparent;
+    }
+}

src/AxCopilot/Views/PreviewWindow.xaml.cs

@@ -314,192 +314,4 @@ public partial class PreviewWindow : Window
             TitleText.Text = $"미리보기 — {Path.GetFileName(_activeTab)}";
     }
 
-    // ─── 콘텐츠 로드 ────────────────────────────────────────────
-
-    private async void LoadContent(string filePath)
-    {
-        var ext = Path.GetExtension(filePath).ToLowerInvariant();
-
-        PreviewBrowser.Visibility = Visibility.Collapsed;
-        TextScroll.Visibility = Visibility.Collapsed;
-        DataGridContent.Visibility = Visibility.Collapsed;
-        EmptyMessage.Visibility = Visibility.Collapsed;
-
-        if (!File.Exists(filePath))
-        {
-            EmptyMessage.Text = "파일을 찾을 수 없습니다";
-            EmptyMessage.Visibility = Visibility.Visible;
-            return;
-        }
-
-        try
-        {
-            switch (ext)
-            {
-                case ".html":
-                case ".htm":
-                    if (!_webViewInitialized) return; // OnLoaded에서 재시도
-                    PreviewBrowser.Source = new Uri(filePath);
-                    PreviewBrowser.Visibility = Visibility.Visible;
-                    break;
-
-                case ".csv":
-                    LoadCsvContent(filePath);
-                    DataGridContent.Visibility = Visibility.Visible;
-                    break;
-
-                case ".md":
-                    if (!_webViewInitialized) return;
-                    var mdText = File.ReadAllText(filePath);
-                    if (mdText.Length > 50000) mdText = mdText[..50000];
-                    var mdHtml = Services.Agent.TemplateService.RenderMarkdownToHtml(
-                        mdText, _selectedMood ?? "modern");
-                    PreviewBrowser.NavigateToString(mdHtml);
-                    PreviewBrowser.Visibility = Visibility.Visible;
-                    break;
-
-                case ".txt":
-                case ".json":
-                case ".xml":
-                case ".log":
-                    var text = File.ReadAllText(filePath);
-                    if (text.Length > 50000) text = text[..50000] + "\n\n... (이후 생략)";
-                    TextContent.Text = text;
-                    TextScroll.Visibility = Visibility.Visible;
-                    break;
-
-                default:
-                    EmptyMessage.Text = "미리보기할 수 없는 파일 형식입니다";
-                    EmptyMessage.Visibility = Visibility.Visible;
-                    break;
-            }
-        }
-        catch (Exception ex)
-        {
-            TextContent.Text = $"미리보기 오류: {ex.Message}";
-            TextScroll.Visibility = Visibility.Visible;
-        }
-
-        await System.Threading.Tasks.Task.CompletedTask; // async 경고 방지
-    }
-
-    private void LoadCsvContent(string filePath)
-    {
-        var lines = File.ReadAllLines(filePath);
-        if (lines.Length == 0) return;
-
-        var dt = new DataTable();
-        var headers = ParseCsvLine(lines[0]);
-        foreach (var h in headers)
-            dt.Columns.Add(h);
-
-        var maxRows = Math.Min(lines.Length, 501);
-        for (int i = 1; i < maxRows; i++)
-        {
-            var vals = ParseCsvLine(lines[i]);
-            var row = dt.NewRow();
-            for (int j = 0; j < Math.Min(vals.Length, headers.Length); j++)
-                row[j] = vals[j];
-            dt.Rows.Add(row);
-        }
-
-        DataGridContent.ItemsSource = dt.DefaultView;
-    }
-
-    private static string[] ParseCsvLine(string line)
-    {
-        var fields = new List<string>();
-        var current = new StringBuilder();
-        bool inQuotes = false;
-
-        for (int i = 0; i < line.Length; i++)
-        {
-            char c = line[i];
-            if (inQuotes)
-            {
-                if (c == '"' && i + 1 < line.Length && line[i + 1] == '"')
-                { current.Append('"'); i++; }
-                else if (c == '"') inQuotes = false;
-                else current.Append(c);
-            }
-            else
-            {
-                if (c == '"') inQuotes = true;
-                else if (c == ',') { fields.Add(current.ToString()); current.Clear(); }
-                else current.Append(c);
-            }
-        }
-        fields.Add(current.ToString());
-        return fields.ToArray();
-    }
-
-    // ─── 타이틀 바 ──────────────────────────────────────────────
-
-    private void TitleBar_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
-    {
-        if (e.ClickCount == 2) { ToggleMaximize(); return; }
-        DragMove();
-    }
-
-    private void OpenExternalBtn_Click(object sender, MouseButtonEventArgs e)
-    {
-        e.Handled = true;
-        if (_activeTab == null || !File.Exists(_activeTab)) return;
-        try
-        {
-            System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo
-            {
-                FileName = _activeTab,
-                UseShellExecute = true,
-            });
-        }
-        catch (Exception ex)
-        {
-            Services.LogService.Warn($"외부 프로그램 열기 실패: {ex.Message}");
-        }
-    }
-
-    private void MinBtn_Click(object sender, MouseButtonEventArgs e)
-    {
-        e.Handled = true;
-        WindowState = WindowState.Minimized;
-    }
-
-    private void MaxBtn_Click(object sender, MouseButtonEventArgs e)
-    {
-        e.Handled = true;
-        ToggleMaximize();
-    }
-
-    private void CloseBtn_Click(object sender, MouseButtonEventArgs e)
-    {
-        e.Handled = true;
-        Close();
-    }
-
-    private void ToggleMaximize()
-    {
-        WindowState = WindowState == WindowState.Maximized
-            ? WindowState.Normal
-            : WindowState.Maximized;
-    }
-
-    private void TitleBtn_Enter(object sender, MouseEventArgs e)
-    {
-        if (sender is Border b)
-            b.Background = TryFindResource("ItemHoverBackground") as Brush
-                           ?? new SolidColorBrush(Color.FromArgb(0x18, 0xFF, 0xFF, 0xFF));
-    }
-
-    private void CloseBtnEnter(object sender, MouseEventArgs e)
-    {
-        if (sender is Border b)
-            b.Background = new SolidColorBrush(Color.FromArgb(0x44, 0xFF, 0x40, 0x40));
-    }
-
-    private void TitleBtn_Leave(object sender, MouseEventArgs e)
-    {
-        if (sender is Border b)
-            b.Background = Brushes.Transparent;
-    }
 }