first iteration

Author: BRUNER Patrick

src/LogExpert.UI/Services/HighlightGroupSelectedEventArgs.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace LogExpert.UI.Services;
+
+/// <summary>Event args for highlight group combo box selection.</summary>
+internal class HighlightGroupSelectedEventArgs (string groupName) : EventArgs
+{
+    public string GroupName { get; } = groupName;
+}

src/LogExpert.UI/Services/HistoryItemClickedEventArgs.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace LogExpert.UI.Services;
+
+/// <summary>Event args for file history item interactions.</summary>
+internal class HistoryItemClickedEventArgs (string fileName) : EventArgs
+{
+    public string FileName { get; } = fileName;
+}

src/LogExpert.UI/Services/IMenuToolbarController.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+using System.Runtime.Versioning;
+
+using LogExpert.Core.EventArguments;
+using LogExpert.Dialogs;
+
+namespace LogExpert.UI.Services;
+
+/// <summary>
+/// Controls menu and toolbar state based on application state.
+/// Thread-safe UI updates via SynchronizationContext.
+/// </summary>
+[SupportedOSPlatform("windows")]
+internal interface IMenuToolbarController : IDisposable
+{
+    /// <summary>
+    /// Initializes controller with menu, toolbar, and timestamp control references.
+    /// Must be called on UI thread.
+    /// </summary>
+    void InitializeMenus (MenuStrip mainMenu, ToolStrip buttonToolbar, ToolStrip externalToolsToolStrip,
+        DateTimeDragControl dragControlDateTime, CheckBox checkBoxFollowTail);
+
+    /// <summary>
+    /// Applies localized resource strings and ToolTips to all menu/toolbar items.
+    /// </summary>
+    void ApplyLocalization ();
+
+    /// <summary>
+    /// Updates all menus, toolbars, encoding, highlight group, and timestamp control
+    /// based on the GUI state event args from a LogWindow.
+    /// </summary>
+    /// <remarks>
+    /// Consumes <see cref="GuiStateEventArgs"/> directly — no intermediate mapping needed.
+    /// </remarks>
+    void UpdateGuiState (GuiStateEventArgs state, bool timestampControlEnabled);
+
+    /// <summary>
+    /// Updates encoding menu to show current encoding.
+    /// Also updates the ANSI menu item header text.
+    /// </summary>
+    void UpdateEncodingMenu (Encoding currentEncoding);
+
+    /// <summary>
+    /// Updates highlight groups combo box.
+    /// </summary>
+    void UpdateHighlightGroups (IEnumerable<string> groups, string selectedGroup);
+
+    /// <summary>
+    /// Populates file history menu with recent files.
+    /// Includes right-click removal support.
+    /// </summary>
+    void PopulateFileHistory (IEnumerable<string> fileHistory);
+
+    // Events
+    event EventHandler<HistoryItemClickedEventArgs> HistoryItemClicked;
+    event EventHandler<HistoryItemClickedEventArgs> HistoryItemRemoveRequested;
+    event EventHandler<HighlightGroupSelectedEventArgs> HighlightGroupSelected;
+}