From ea37f91c68f31dbaaff2eb17a67dcbc38bf8f71d Mon Sep 17 00:00:00 2001
From: Nina Middelmann <NinaM@ranger.de>
Date: Thu, 7 May 2026 12:22:30 +0200
Subject: [PATCH] feat: support host-supplied named theme presets

Replaces the long-standing "Not Implemented" preset stub with a
working dropdown driven by themes the host application provides.

- Add optional `Name` to `ThemeManagerTheme` so the existing wrapper
  can carry a display name. Default null preserves all existing usage.
- Add `[Parameter] IEnumerable<ThemeManagerTheme>? Presets` and
  `[Parameter] EventCallback<ThemeManagerTheme> PresetSelected` on
  `MudThemeManager`. When `Presets` is null the original disabled
  stub renders unchanged (backward compatible).
- Refactor theme initialisation into `SyncWithTheme()` and run it
  from both `OnInitialized` and `OnParametersSet`, with a reference
  guard. This lets the host swap the active theme via the existing
  `Theme` parameter (e.g. on preset selection) and have the manager
  re-sync its internal palette caches. Without this, switching the
  active theme after first render would leave subsequent edits
  applied to the previous theme.

The library remains storage-agnostic: presets are passed in by the
host, persistence stays the host application concern.
---
 .../Components/MudThemeManager.razor          | 18 ++++++++++++---
 .../Components/MudThemeManager.razor.cs       | 22 ++++++++++++++++++-
 .../Models/ThemeManagerTheme.cs               |  2 ++
 3 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/src/MudBlazor.ThemeManager/Components/MudThemeManager.razor b/src/MudBlazor.ThemeManager/Components/MudThemeManager.razor
index f7e1f35..65718c7 100644
--- a/src/MudBlazor.ThemeManager/Components/MudThemeManager.razor
+++ b/src/MudBlazor.ThemeManager/Components/MudThemeManager.razor
@@ -5,9 +5,21 @@
     <MudDrawer @bind-Open:get="_openState.Value" @bind-Open:set="_openState.SetValueAsync" Anchor="Anchor.End" Elevation="25" Variant="@DrawerVariant.Temporary" Overlay="false" Width="312px">
         <div class="pt-4 px-4">
             <MudText Typo="Typo.h6">Theme Presets</MudText>
-            <MudSelect T="string" @bind-Value="@ThemePresets" Disabled="true" Underline="false">
-                <MudSelectItem Value="@("Not Implemented")" />
-            </MudSelect>
+            @if (Presets is null)
+            {
+                <MudSelect T="string" @bind-Value="@ThemePresets" Disabled="true" Underline="false">
+                    <MudSelectItem Value="@("Not Implemented")" />
+                </MudSelect>
+            }
+            else
+            {
+                <MudSelect T="ThemeManagerTheme" Value="Theme" ValueChanged="OnPresetSelectedAsync" Underline="false">
+                    @foreach (var preset in Presets)
+                    {
+                        <MudSelectItem Value="@preset">@(preset.Name ?? "(unnamed)")</MudSelectItem>
+                    }
+                </MudSelect>
+            }
         </div>
         <MudDivider Class="my-2" />
         <div class="pt-2 px-4">
diff --git a/src/MudBlazor.ThemeManager/Components/MudThemeManager.razor.cs b/src/MudBlazor.ThemeManager/Components/MudThemeManager.razor.cs
index 7340836..f29813f 100644
--- a/src/MudBlazor.ThemeManager/Components/MudThemeManager.razor.cs
+++ b/src/MudBlazor.ThemeManager/Components/MudThemeManager.razor.cs
@@ -15,6 +15,7 @@ public partial class MudThemeManager : ComponentBaseWithState
     private Palette? _currentPaletteDark;
     private Palette _currentPalette;
     private MudTheme? _customTheme;
+    private ThemeManagerTheme? _previousTheme;
 
     public MudThemeManager()
     {
@@ -45,14 +46,30 @@ public MudThemeManager()
     [Parameter]
     public ColorPickerView ColorPickerView { get; set; } = ColorPickerView.Spectrum;
 
+    [Parameter]
+    public IEnumerable<ThemeManagerTheme>? Presets { get; set; }
+
+    [Parameter]
+    public EventCallback<ThemeManagerTheme> PresetSelected { get; set; }
+
     [Parameter]
     public EventCallback<ThemeManagerTheme> ThemeChanged { get; set; }
 
     protected override void OnInitialized()
     {
         base.OnInitialized();
+        SyncWithTheme();
+    }
 
-        if (Theme is null)
+    protected override void OnParametersSet()
+    {
+        base.OnParametersSet();
+        SyncWithTheme();
+    }
+
+    private void SyncWithTheme()
+    {
+        if (Theme is null || ReferenceEquals(Theme, _previousTheme))
         {
             return;
         }
@@ -61,8 +78,11 @@ protected override void OnInitialized()
         _currentPaletteLight = Theme.Theme.PaletteLight.DeepClone();
         _currentPaletteDark = Theme.Theme.PaletteDark.DeepClone();
         _currentPalette = GetPalette();
+        _previousTheme = Theme;
     }
 
+    private Task OnPresetSelectedAsync(ThemeManagerTheme value) => PresetSelected.InvokeAsync(value);
+
     public Task UpdatePalette(ThemeUpdatedValue value)
     {
         UpdateCustomTheme();
diff --git a/src/MudBlazor.ThemeManager/Models/ThemeManagerTheme.cs b/src/MudBlazor.ThemeManager/Models/ThemeManagerTheme.cs
index 9afdb4a..be49cdf 100644
--- a/src/MudBlazor.ThemeManager/Models/ThemeManagerTheme.cs
+++ b/src/MudBlazor.ThemeManager/Models/ThemeManagerTheme.cs
@@ -2,6 +2,8 @@
 
 public class ThemeManagerTheme
 {
+    public string? Name { get; set; }
+
     public MudTheme Theme { get; set; } = new();
 
     public bool RTL { get; set; }