mid settings improvement attempt

LightlessSync/UI/UISharedService.cs

@@ -28,8 +28,10 @@ using LightlessSync.WebAPI;
 using LightlessSync.WebAPI.SignalR;
 using Microsoft.Extensions.Logging;
 using System;
+using System.Collections.Generic;
 using System.IdentityModel.Tokens.Jwt;
 using System.Numerics;
+using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using System.Text;
 using System.Text.RegularExpressions;
@@ -191,6 +193,99 @@ public partial class UiSharedService : DisposableMediatorSubscriberBase
         return addSuffix ? $"{dblSByte:0.00} {suffix[i]}" : $"{dblSByte:0.00}";
     }
 
+    public readonly struct TabOption<T>
+    {
+        public string Label { get; }
+        public T Value { get; }
+        public bool Enabled { get; }
+
+        public TabOption(string label, T value, bool enabled = true)
+        {
+            Label = label;
+            Value = value;
+            Enabled = enabled;
+        }
+    }
+
+    public static bool Tab<T>(string id, IReadOnlyList<TabOption<T>> options, ref T selectedValue) where T : struct
+    {
+        if (options.Count == 0)
+            return false;
+
+        var pushIdValue = string.IsNullOrEmpty(id)
+            ? $"UiSharedTab_{RuntimeHelpers.GetHashCode(options):X}"
+            : id;
+        using var tabId = ImRaii.PushId(pushIdValue);
+
+        var selectedIndex = -1;
+        for (var i = 0; i < options.Count; i++)
+        {
+            if (!EqualityComparer<T>.Default.Equals(options[i].Value, selectedValue))
+                continue;
+
+            selectedIndex = i;
+            break;
+        }
+
+        if (selectedIndex == -1 || !options[selectedIndex].Enabled)
+            selectedIndex = GetFirstEnabledTabIndex(options);
+
+        if (selectedIndex == -1)
+            return false;
+
+        var changed = DrawTabsInternal(options, ref selectedIndex);
+        selectedValue = options[Math.Clamp(selectedIndex, 0, options.Count - 1)].Value;
+        return changed;
+    }
+
+    private static int GetFirstEnabledTabIndex<T>(IReadOnlyList<TabOption<T>> options)
+    {
+        for (var i = 0; i < options.Count; i++)
+        {
+            if (options[i].Enabled)
+                return i;
+        }
+
+        return -1;
+    }
+
+    private static bool DrawTabsInternal<T>(IReadOnlyList<TabOption<T>> options, ref int selectedIndex)
+    {
+        selectedIndex = Math.Clamp(selectedIndex, 0, Math.Max(0, options.Count - 1));
+
+        var style = ImGui.GetStyle();
+        var availableWidth = ImGui.GetContentRegionAvail().X;
+        var spacingX = style.ItemSpacing.X;
+        var buttonWidth = options.Count > 0 ? Math.Max(1f, (availableWidth - spacingX * (options.Count - 1)) / options.Count) : availableWidth;
+        var buttonHeight = Math.Max(ImGui.GetFrameHeight() + style.FramePadding.Y, 28f * ImGuiHelpers.GlobalScale);
+        var changed = false;
+
+        for (var i = 0; i < options.Count; i++)
+        {
+            if (i > 0)
+                ImGui.SameLine();
+
+            var tab = options[i];
+            var isSelected = i == selectedIndex;
+
+            using (ImRaii.Disabled(!tab.Enabled))
+            {
+                using var tabIndexId = ImRaii.PushId(i);
+                using var selectedButton = isSelected ? ImRaii.PushColor(ImGuiCol.Button, style.Colors[(int)ImGuiCol.TabActive]) : null;
+                using var selectedHover = isSelected ? ImRaii.PushColor(ImGuiCol.ButtonHovered, style.Colors[(int)ImGuiCol.TabHovered]) : null;
+                using var selectedActive = isSelected ? ImRaii.PushColor(ImGuiCol.ButtonActive, style.Colors[(int)ImGuiCol.TabActive]) : null;
+
+                if (ImGui.Button(tab.Label, new Vector2(buttonWidth, buttonHeight)))
+                {
+                    selectedIndex = i;
+                    changed = true;
+                }
+            }
+        }
+
+        return changed;
+    }
+
     public static void CenterNextWindow(float width, float height, ImGuiCond cond = ImGuiCond.None)
     {
         var center = ImGui.GetMainViewport().GetCenter();