Add Theme system to Blazor UI

framework/src/Volo.Abp.AspNetCore.Components.Web.Theming/Layout/StandardLayouts.cs

@@ -1,6 +1,11 @@
-namespace Volo.Abp.AspNetCore.Components.Web.Theming.Layout;
+using System;
+
+namespace Volo.Abp.AspNetCore.Components.Web.Theming.Layout;
 
 public static class StandardLayouts
 {
     public const string Application = "Application";
+    public const string Account = "Account";
+    public const string Public = "Public";
+    public const string Empty = "Empty";
 }

framework/src/Volo.Abp.AspNetCore.Components.Web.Theming/Theming/AbpThemingOptions.cs

@@ -0,0 +1,13 @@
+namespace Volo.Abp.AspNetCore.Components.Web.Theming.Theming;
+
+public class 
+{
+    public ThemeDictionary Themes { get; }
+
+    public string DefaultThemeName { get; set; }
+
+    public AbpThemingOptions()
+    {
+        Themes = new ThemeDictionary();
+    }
+}

framework/src/Volo.Abp.AspNetCore.Components.Web.Theming/Theming/DefaultThemeManager.cs

@@ -0,0 +1,34 @@
+using System;
+using Microsoft.Extensions.DependencyInjection;
+using Volo.Abp.DependencyInjection;
+
+namespace Volo.Abp.AspNetCore.Components.Web.Theming.Theming;
+
+public class DefaultThemeManager : IThemeManager, IScopedDependency, IServiceProviderAccessor
+{ 
+    public IServiceProvider ServiceProvider { get; }
+    public ITheme CurrentTheme => GetCurrentTheme();
+    
+    private ITheme _currentTheme;
+
+    protected IThemeSelector ThemeSelector { get; }
+
+    public DefaultThemeManager(
+        IServiceProvider serviceProvider,
+        IThemeSelector themeSelector)
+    {
+        ServiceProvider = serviceProvider;
+        ThemeSelector = themeSelector;
+    }
+
+    protected virtual ITheme GetCurrentTheme()
+    {
+        if (_currentTheme != null)
+        {
+            return _currentTheme;
+        }
+        
+        _currentTheme = (ITheme)ServiceProvider.GetRequiredService(ThemeSelector.GetCurrentThemeInfo().ThemeType);
+        return CurrentTheme;
+    }
+}

framework/src/Volo.Abp.AspNetCore.Components.Web.Theming/Theming/DefaultThemeSelector.cs

@@ -0,0 +1,36 @@
+using System.Linq;
+using Microsoft.Extensions.Options;
+using Volo.Abp.DependencyInjection;
+
+namespace Volo.Abp.AspNetCore.Components.Web.Theming.Theming;
+
+public class DefaultThemeSelector : IThemeSelector, ITransientDependency
+{
+    protected AbpThemingOptions Options { get; }
+
+    public DefaultThemeSelector(IOptions<AbpThemingOptions> options)
+    {
+        Options = options.Value;
+    }
+
+    public virtual ThemeInfo GetCurrentThemeInfo()
+    {
+        if (!Options.Themes.Any())
+        {
+            throw new AbpException($"No theme registered! Use {nameof(AbpThemingOptions)} to register themes.");
+        }
+
+        if (Options.DefaultThemeName == null)
+        {
+            return Options.Themes.Values.First();
+        }
+
+        var themeInfo = Options.Themes.Values.FirstOrDefault(t => t.Name == Options.DefaultThemeName);
+        if (themeInfo == null)
+        {
+            throw new AbpException("Default theme is configured but it's not found in the registered themes: " + Options.DefaultThemeName);
+        }
+
+        return themeInfo;
+    }
+}

framework/src/Volo.Abp.AspNetCore.Components.Web.Theming/Theming/ITheme.cs

@@ -0,0 +1,8 @@
+using System;
+
+namespace Volo.Abp.AspNetCore.Components.Web.Theming.Theming;
+
+public interface ITheme
+{
+    Type GetLayout(string name, bool fallbackToDefault = true);
+}

framework/src/Volo.Abp.AspNetCore.Components.Web.Theming/Theming/IThemeManager.cs

@@ -0,0 +1,6 @@
+namespace Volo.Abp.AspNetCore.Components.Web.Theming.Theming;
+
+public interface IThemeManager
+{
+    ITheme CurrentTheme { get; }
+}

framework/src/Volo.Abp.AspNetCore.Components.Web.Theming/Theming/IThemeSelector.cs

@@ -0,0 +1,6 @@
+namespace Volo.Abp.AspNetCore.Components.Web.Theming.Theming;
+
+public interface IThemeSelector
+{
+    ThemeInfo GetCurrentThemeInfo();
+}

framework/src/Volo.Abp.AspNetCore.Components.Web.Theming/Theming/ThemeDictionary.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+
+namespace Volo.Abp.AspNetCore.Components.Web.Theming.Theming;
+
+public class ThemeDictionary : Dictionary<Type, ThemeInfo>
+{
+    public ThemeInfo Add<TTheme>()
+        where TTheme : ITheme
+    {
+        return Add(typeof(TTheme));
+    }
+
+    public ThemeInfo Add(Type themeType)
+    {
+        if (ContainsKey(themeType))
+        {
+            throw new AbpException("This theme is already added before: " + themeType.AssemblyQualifiedName);
+        }
+
+        return this[themeType] = new ThemeInfo(themeType);
+    }
+}

framework/src/Volo.Abp.AspNetCore.Components.Web.Theming/Theming/ThemeExtensions.cs

@@ -0,0 +1,27 @@
+using System;
+using Volo.Abp.AspNetCore.Components.Web.Theming.Layout;
+
+namespace Volo.Abp.AspNetCore.Components.Web.Theming.Theming;
+
+public static class ThemeExtensions
+{
+    public static Type GetApplicationLayout(this ITheme theme, bool fallbackToDefault = true)
+    {
+        return theme.GetLayout(StandardLayouts.Application, fallbackToDefault);
+    }
+
+    public static Type GetAccountLayout(this ITheme theme, bool fallbackToDefault = true)
+    {
+        return theme.GetLayout(StandardLayouts.Account, fallbackToDefault);
+    }
+
+    public static Type GetPublicLayout(this ITheme theme, bool fallbackToDefault = true)
+    {
+        return theme.GetLayout(StandardLayouts.Public, fallbackToDefault);
+    }
+
+    public static Type GetEmptyLayout(this ITheme theme, bool fallbackToDefault = true)
+    {
+        return theme.GetLayout(StandardLayouts.Empty, fallbackToDefault);
+    }
+}

framework/src/Volo.Abp.AspNetCore.Components.Web.Theming/Theming/ThemeInfo.cs

@@ -0,0 +1,24 @@
+using System;
+using JetBrains.Annotations;
+
+namespace Volo.Abp.AspNetCore.Components.Web.Theming.Theming;
+
+public class ThemeInfo
+{
+    public Type ThemeType { get; }
+
+    public string Name { get; }
+
+    public ThemeInfo([NotNull] Type themeType)
+    {
+        Check.NotNull(themeType, nameof(themeType));
+
+        if (!typeof(ITheme).IsAssignableFrom(themeType))
+        {
+            throw new AbpException($"Given {nameof(themeType)} ({themeType.AssemblyQualifiedName}) should be type of {typeof(ITheme).AssemblyQualifiedName}");
+        }
+
+        ThemeType = themeType;
+        Name = ThemeNameAttribute.GetName(themeType);
+    }
+}

framework/src/Volo.Abp.AspNetCore.Components.Web.Theming/Theming/ThemeNameAttribute.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Linq;
+
+namespace Volo.Abp.AspNetCore.Components.Web.Theming.Theming;
+
+[AttributeUsage(AttributeTargets.Class)]
+public class ThemeNameAttribute : Attribute
+{
+    public string Name { get; set; }
+
+    public ThemeNameAttribute(string name)
+    {
+        Name = name;
+    }
+
+    public static string GetName(Type themeType)
+    {
+        return themeType
+                   .GetCustomAttributes(true)
+                   .OfType<ThemeNameAttribute>()
+                   .FirstOrDefault()?.Name ?? themeType.Name;
+    }
+}