Add debug logging with Show Log button

- DebugLogger class saves logs to %TEMP%\CMM\debug.log
- Show Log button appears after 3s if loading takes too long
- Log viewer with Copy to Clipboard and Open Log File options
- Detailed logging throughout LoadMonitors for debugging

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

DellMonitorControl/DebugLogger.cs

@@ -0,0 +1,77 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+
+namespace DellMonitorControl;
+
+public static class DebugLogger
+{
+    private static readonly List<string> _logs = new();
+    private static readonly object _lock = new();
+    private static readonly string _logFilePath;
+
+    static DebugLogger()
+    {
+        var tempPath = Path.Combine(Path.GetTempPath(), "CMM");
+        Directory.CreateDirectory(tempPath);
+        _logFilePath = Path.Combine(tempPath, "debug.log");
+    }
+
+    public static void Log(string message)
+    {
+        var entry = $"[{DateTime.Now:HH:mm:ss.fff}] {message}";
+        lock (_lock)
+        {
+            _logs.Add(entry);
+            try
+            {
+                File.AppendAllText(_logFilePath, entry + Environment.NewLine);
+            }
+            catch { }
+        }
+    }
+
+    public static void LogError(string message, Exception? ex = null)
+    {
+        var entry = ex != null
+            ? $"[{DateTime.Now:HH:mm:ss.fff}] ERROR: {message} - {ex.GetType().Name}: {ex.Message}"
+            : $"[{DateTime.Now:HH:mm:ss.fff}] ERROR: {message}";
+        lock (_lock)
+        {
+            _logs.Add(entry);
+            if (ex != null)
+                _logs.Add($"    Stack: {ex.StackTrace}");
+            try
+            {
+                File.AppendAllText(_logFilePath, entry + Environment.NewLine);
+                if (ex != null)
+                    File.AppendAllText(_logFilePath, $"    Stack: {ex.StackTrace}" + Environment.NewLine);
+            }
+            catch { }
+        }
+    }
+
+    public static string GetLogs()
+    {
+        lock (_lock)
+        {
+            return string.Join(Environment.NewLine, _logs);
+        }
+    }
+
+    public static void Clear()
+    {
+        lock (_lock)
+        {
+            _logs.Clear();
+            try
+            {
+                File.WriteAllText(_logFilePath, "");
+            }
+            catch { }
+        }
+    }
+
+    public static string LogFilePath => _logFilePath;
+}

DellMonitorControl/MainWindow.xaml

@@ -215,6 +215,9 @@
                         </Ellipse>
                         <TextBlock Name="loadingText" Text="Loading..." Foreground="LightGray" FontSize="12"
                                    HorizontalAlignment="Center"/>
+                        <Button Name="showLogButton" Content="Show Log" Margin="0,10,0,0"
+                                Style="{StaticResource DarkButton}" FontSize="10"
+                                Click="ShowLogButton_Click" Visibility="Collapsed"/>
                     </StackPanel>
                 </StackPanel>
             </ScrollViewer>

DellMonitorControl/MainWindow.xaml.cs

@@ -9,6 +9,7 @@ using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Media;
 using System.Windows.Media.Animation;
+using System.Windows.Threading;
 
 namespace DellMonitorControl;
 
@@ -16,15 +17,18 @@ public partial class MainWindow : Window
 {
     private List<(XMonitor Monitor, List<InputSourceOption> Options)> _loadedMonitors = new();
     private Storyboard? _spinnerStoryboard;
+    private DispatcherTimer? _showLogButtonTimer;
 
     public MainWindow()
     {
         InitializeComponent();
         _spinnerStoryboard = (Storyboard)FindResource("SpinnerAnimation");
+        DebugLogger.Log("MainWindow initialized");
     }
 
     public void ShowNearTray()
     {
+        DebugLogger.Log("ShowNearTray called");
         var workArea = SystemParameters.WorkArea;
         Left = workArea.Right - Width - 10;
         Top = workArea.Bottom - 350;
@@ -34,10 +38,25 @@ public partial class MainWindow : Window
         // Start spinner
         _spinnerStoryboard?.Begin(this, true);
 
+        // Show log button after 3 seconds if still loading
+        showLogButton.Visibility = Visibility.Collapsed;
+        _showLogButtonTimer?.Stop();
+        _showLogButtonTimer = new DispatcherTimer { Interval = TimeSpan.FromSeconds(3) };
+        _showLogButtonTimer.Tick += (s, e) =>
+        {
+            _showLogButtonTimer.Stop();
+            if (loadingPanel.Visibility == Visibility.Visible || sp.Children.Contains(loadingPanel))
+            {
+                showLogButton.Visibility = Visibility.Visible;
+                DebugLogger.Log("Show Log button displayed (loading took > 3s)");
+            }
+        };
+        _showLogButtonTimer.Start();
+
         Dispatcher.BeginInvoke(new Action(() =>
         {
             Top = workArea.Bottom - ActualHeight - 10;
-        }), System.Windows.Threading.DispatcherPriority.Loaded);
+        }), DispatcherPriority.Loaded);
     }
 
     private void Window_Deactivated(object sender, EventArgs e)
@@ -51,18 +70,86 @@ public partial class MainWindow : Window
         Application.Current.Shutdown();
     }
 
+    private void ShowLogButton_Click(object sender, RoutedEventArgs e)
+    {
+        var logWindow = new Window
+        {
+            Title = "Debug Log",
+            Width = 600,
+            Height = 400,
+            WindowStartupLocation = WindowStartupLocation.CenterScreen,
+            Background = new SolidColorBrush(Color.FromRgb(45, 45, 45))
+        };
+
+        var grid = new Grid();
+        grid.RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Star) });
+        grid.RowDefinitions.Add(new RowDefinition { Height = GridLength.Auto });
+
+        var textBox = new TextBox
+        {
+            Text = DebugLogger.GetLogs(),
+            IsReadOnly = true,
+            Background = new SolidColorBrush(Color.FromRgb(30, 30, 30)),
+            Foreground = Brushes.LightGray,
+            FontFamily = new FontFamily("Consolas"),
+            FontSize = 11,
+            VerticalScrollBarVisibility = ScrollBarVisibility.Auto,
+            HorizontalScrollBarVisibility = ScrollBarVisibility.Auto,
+            TextWrapping = TextWrapping.NoWrap,
+            Margin = new Thickness(10)
+        };
+        Grid.SetRow(textBox, 0);
+        grid.Children.Add(textBox);
+
+        var buttonPanel = new StackPanel { Orientation = Orientation.Horizontal, HorizontalAlignment = HorizontalAlignment.Right, Margin = new Thickness(10) };
+
+        var copyBtn = new Button { Content = "Copy to Clipboard", Padding = new Thickness(10, 5, 10, 5), Margin = new Thickness(0, 0, 10, 0) };
+        copyBtn.Click += (s, args) =>
+        {
+            Clipboard.SetText(DebugLogger.GetLogs());
+            MessageBox.Show("Log copied to clipboard!", "Debug Log", MessageBoxButton.OK, MessageBoxImage.Information);
+        };
+        buttonPanel.Children.Add(copyBtn);
+
+        var openFileBtn = new Button { Content = "Open Log File", Padding = new Thickness(10, 5, 10, 5), Margin = new Thickness(0, 0, 10, 0) };
+        openFileBtn.Click += (s, args) =>
+        {
+            try
+            {
+                System.Diagnostics.Process.Start("explorer.exe", $"/select,\"{DebugLogger.LogFilePath}\"");
+            }
+            catch { }
+        };
+        buttonPanel.Children.Add(openFileBtn);
+
+        var closeBtn = new Button { Content = "Close", Padding = new Thickness(10, 5, 10, 5) };
+        closeBtn.Click += (s, args) => logWindow.Close();
+        buttonPanel.Children.Add(closeBtn);
+
+        Grid.SetRow(buttonPanel, 1);
+        grid.Children.Add(buttonPanel);
+
+        logWindow.Content = grid;
+        logWindow.Show();
+    }
+
     public async Task LoadMonitors()
     {
+        DebugLogger.Log("LoadMonitors started");
         var newChildren = new List<UIElement>();
         _loadedMonitors.Clear();
 
         try
         {
+            DebugLogger.Log("Scanning for monitors...");
             await CMMCommand.ScanMonitor();
+            DebugLogger.Log("Scan complete, reading monitor data...");
             var monitors = (await CMMCommand.ReadMonitorsData()).ToList();
+            DebugLogger.Log($"Found {monitors.Count} monitor(s)");
 
             if (!monitors.Any())
             {
+                DebugLogger.Log("No DDC/CI monitors detected");
                 newChildren.Add(new TextBlock
                 {
                     Text = "No DDC/CI monitors detected",
@@ -76,16 +163,33 @@ public partial class MainWindow : Window
             {
                 foreach (var m in monitors)
                 {
+                    DebugLogger.Log($"Processing monitor: {m.MonitorName} (SN: {m.SerialNumber})");
+
+                    DebugLogger.Log($"  Getting brightness...");
                     var brightness = await CMMCommand.GetBrightness(m.SerialNumber) ?? 50;
+                    DebugLogger.Log($"  Brightness: {brightness}");
+
+                    DebugLogger.Log($"  Getting contrast...");
                     var contrast = await CMMCommand.GetContrast(m.SerialNumber) ?? 50;
+                    DebugLogger.Log($"  Contrast: {contrast}");
+
+                    DebugLogger.Log($"  Getting input source...");
                     var inputSource = await CMMCommand.GetInputSource(m.SerialNumber);
+                    DebugLogger.Log($"  Input source: {inputSource}");
+
+                    DebugLogger.Log($"  Getting input options...");
                     var inputOptions = await CMMCommand.GetInputSourceOptions(m.SerialNumber);
+                    DebugLogger.Log($"  Input options count: {inputOptions.Count}");
+
+                    DebugLogger.Log($"  Getting power status...");
                     var powerStatus = await CMMCommand.GetMonPowerStatus(m.SerialNumber) ?? "Unknown";
+                    DebugLogger.Log($"  Power status: {powerStatus}");
 
                     _loadedMonitors.Add((m, inputOptions));
 
                     // Apply config to filter hidden ports and use custom labels
                     var filteredOptions = MonitorConfigManager.ApplyConfigToOptions(m.SerialNumber, inputOptions);
+                    DebugLogger.Log($"  Filtered options count: {filteredOptions.Count}");
 
                     // Monitor name header with Config button
                     newChildren.Add(CreateMonitorHeader(m, inputOptions));
@@ -100,6 +204,8 @@ public partial class MainWindow : Window
 
                     // Separator
                     newChildren.Add(new Border { Height = 1, Background = new SolidColorBrush(Color.FromRgb(80, 80, 80)), Margin = new Thickness(0, 10, 0, 2) });
+
+                    DebugLogger.Log($"  Monitor {m.MonitorName} processing complete");
                 }
 
                 // Remove last separator
@@ -108,27 +214,33 @@ public partial class MainWindow : Window
             }
 
             // Load quick-switch toolbar
+            DebugLogger.Log("Loading quick-switch toolbar...");
             LoadQuickSwitchToolbar();
+            DebugLogger.Log("Quick-switch toolbar loaded");
         }
         catch (Exception ex)
         {
+            DebugLogger.LogError("LoadMonitors failed", ex);
             newChildren.Clear();
             newChildren.Add(new TextBlock { Text = $"Error: {ex.Message}", Foreground = Brushes.OrangeRed, FontSize = 11, TextWrapping = TextWrapping.Wrap });
         }
 
-        // Stop spinner
+        // Stop spinner and timer
         _spinnerStoryboard?.Stop(this);
+        _showLogButtonTimer?.Stop();
 
         sp.VerticalAlignment = VerticalAlignment.Top;
         sp.Children.Clear();
         foreach (var child in newChildren)
             sp.Children.Add(child);
 
+        DebugLogger.Log("LoadMonitors complete, UI updated");
+
         Dispatcher.BeginInvoke(new Action(() =>
         {
             var workArea = SystemParameters.WorkArea;
             Top = workArea.Bottom - ActualHeight - 10;
-        }), System.Windows.Threading.DispatcherPriority.Loaded);
+        }), DispatcherPriority.Loaded);
     }
 
     private void LoadQuickSwitchToolbar()