feat: style manager for separate elements

DarkNet/WPF/ElementSkinManager.cs

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+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace Dark.Net.Wpf;
+
+public class ElementSkinManager {
+
+    private          ResourceDictionary? _skinResources;
+    private          Uri?                _lightThemeResources;
+    private          Uri?                _darkThemeResources;
+    private readonly IDarkNet            _darkNet;
+    private readonly FrameworkElement      element;
+
+    /// <summary>
+    /// Create a new instance that uses the default <see cref="DarkNet"/> instance.
+    /// </summary>
+    public ElementSkinManager(FrameworkElement element): this(DarkNet.Instance, element) { }
+
+    /// <summary>
+    /// Create a new instance that uses a custom <see cref="IDarkNet"/> instance.
+    /// </summary>
+    public ElementSkinManager(IDarkNet darkNet, FrameworkElement element) {
+        _darkNet = darkNet;
+        this.element = element;
+    }
+
+    public virtual void RegisterSkins(Uri lightThemeResources, Uri darkThemeResources) {
+        _darkThemeResources  = darkThemeResources;
+        _lightThemeResources = lightThemeResources;
+
+        if (_skinResources == null) {
+            Collection<ResourceDictionary> windowResources = element.Resources.MergedDictionaries;
+            _skinResources = windowResources.FirstOrDefault(r => r.Source.Equals(lightThemeResources) || r.Source.Equals(darkThemeResources));
+
+            if (_skinResources == null) {
+                _skinResources = new ResourceDictionary();
+                windowResources.Add(_skinResources);
+            }
+
+            UpdateTheme(_darkNet.EffectiveCurrentProcessThemeIsDark);
+        }
+    }
+
+    /// <summary>
+    /// <para>Change the <see cref="FrameworkElement"/>'s <see cref="ResourceDictionary"/>'s <see cref="ResourceDictionary.Source"/> between the light and dark URIs which were set by
+    /// <see cref="RegisterSkins"/>.</para>
+    /// <para>This is called once by <see cref="RegisterSkins"/>, and again anytime you want to switch between themes for the control.</para>
+    /// </summary>
+    /// <param name="isDarkTheme"><see langword="true" /> to set dark theme, or <see langword="false"/> to set light theme.</param>
+    public virtual void UpdateTheme(bool isDarkTheme) {
+        if (_skinResources != null) {
+            _skinResources.Source = isDarkTheme ? _darkThemeResources : _lightThemeResources;
+        }
+    }
+
+    /// <summary>
+    /// <para>Change the <see cref="FrameworkElement"/>'s <see cref="ResourceDictionary"/>'s <see cref="ResourceDictionary.Source"/> between the light and dark URIs which were set by
+    /// <see cref="RegisterSkins"/>.</para>
+    /// <para>This is called once by <see cref="RegisterSkins"/>, and again anytime you want to switch between themes for the control.</para>
+    /// </summary>
+    /// <param name="theme"><see cref="Theme.Dark"/> to set dark theme, <see cref="Theme.Light"/> to set light theme, or <see cref="Theme.Auto"/> to set current process theme</param>
+    public virtual void UpdateTheme(Theme theme)
+    {
+        var isDarkTheme = theme switch
+        {
+            Theme.Auto => _darkNet.EffectiveCurrentProcessThemeIsDark,
+            Theme.Light => false,
+            Theme.Dark => true,
+            _ => throw new ArgumentOutOfRangeException(nameof(theme), theme, null)
+        };
+        UpdateTheme(isDarkTheme);
+    }
+
+}

darknet-demo-wpf-2/.editorconfig

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+[*]
+
+# Exception Analyzers: Exception adjustments syntax error
+# default = error
+; dotnet_diagnostic.Ex0001.severity = none
+
+# Exception Analyzers: Exception adjustments syntax error: Symbol does not exist or identifier is invalid
+# default = warning
+; dotnet_diagnostic.Ex0002.severity = none
+
+# Exception Analyzers: Member may throw undocumented exception
+# default = warning
+dotnet_diagnostic.Ex0100.severity = none
+
+# Exception Analyzers: Member accessor may throw undocumented exception
+# default = warning
+dotnet_diagnostic.Ex0101.severity = none
+
+# Exception Analyzers: Implicit constructor may throw undocumented exception
+# default = warning
+dotnet_diagnostic.Ex0103.severity = none
+
+# Exception Analyzers: Member initializer may throw undocumented exception
+# default = warning
+dotnet_diagnostic.Ex0104.severity = none
+
+# Exception Analyzers: Delegate created from member may throw undocumented exception
+# default = silent
+; dotnet_diagnostic.Ex0120.severity = none
+
+# Exception Analyzers: Delegate created from anonymous function may throw undocumented exception
+# default = silent
+; dotnet_diagnostic.Ex0121.severity = none
+
+# Exception Analyzers: Member is documented as throwing exception not documented on member in base or interface type
+# default = warning
+dotnet_diagnostic.Ex0200.severity = none
+
+# Exception Analyzers: Member accessor is documented as throwing exception not documented on member in base or interface type
+# default = warning
+dotnet_diagnostic.Ex0201.severity = none

darknet-demo-wpf-2/App.xaml

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+<Application x:Class="darknet_demo_wpf_2.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+</Application>

darknet-demo-wpf-2/App.xaml.cs

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+using System;
+using System.Windows;
+using Dark.Net;
+using Dark.Net.Wpf;
+
+namespace darknet_demo_wpf_2;
+
+public partial class App {
+
+    protected override void OnStartup(StartupEventArgs e) {
+        const Theme processTheme = Theme.Auto;
+        IDarkNet    darkNet      = DarkNet.Instance;
+        darkNet.SetCurrentProcessTheme(processTheme);
+        Console.WriteLine($"Process theme is {processTheme}");
+        Console.WriteLine($"System theme is {(darkNet.UserDefaultAppThemeIsDark ? "Dark" : "Light")}");
+        Console.WriteLine($"Taskbar theme {(darkNet.UserTaskbarThemeIsDark ? "Dark" : "Light")}");
+
+        darkNet.UserDefaultAppThemeIsDarkChanged += (_, isSystemDarkTheme) => { Console.WriteLine($"System theme is {(isSystemDarkTheme ? "Dark" : "Light")}"); };
+        darkNet.UserTaskbarThemeIsDarkChanged    += (_, isTaskbarDarkTheme) => { Console.WriteLine($"Taskbar theme is {(isTaskbarDarkTheme ? "Dark" : "Light")}"); };
+
+        base.OnStartup(e);
+
+        var w1 = new MainWindow();
+        var w2 = new MainWindow();
+        w1.Show();
+        w2.Show();
+
+    }
+
+}

darknet-demo-wpf-2/AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]

darknet-demo-wpf-2/MainWindow.xaml

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+<Window x:Class="darknet_demo_wpf_2.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d"
+        Title="WPF demo - .NET 6 - DarkNet" Height="450" Width="800" Icon="/icon.png" Style="{DynamicResource windowStyle}">
+    <Window.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <!--
+                This will be replaced with the correct skin to match the title bar theme by SkinManager
+                Also, "light" is more DesignTime-friendly
+                -->
+                <ResourceDictionary Source="Skins/Skin.Light.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+            <!--Place all your window resources here (inside ResourceDictionary)-->
+        </ResourceDictionary>
+    </Window.Resources>
+    <Grid>
+        <StackPanel Orientation="Vertical">
+            <Label Content="Try changing your color mode in Windows Settings to see this app's title bar, menu, and client area react." />
+            <Label Content="Also try clicking checkbox in both windows to see how they change theme independently." />
+            <CheckBox x:Name="darkModeCheckbox" Content="Dark mode" Click="onDarkModeCheckboxChanged" IsThreeState="True" IsChecked="{x:Null}" />
+            <StackPanel Name="SpecialPanel" Margin="20" Orientation="Horizontal" HorizontalAlignment="Center">
+                <Label Margin="10" Content="This panel's theme is set separately"></Label>
+                <CheckBox Margin="10" x:Name="darkModePanelCheckbox" Content="Dark mode this panel" Click="onDarkModePanelCheckboxChanged" IsThreeState="True" IsChecked="{x:Null}" />
+            </StackPanel>
+        </StackPanel>
+
+    </Grid>
+</Window>

darknet-demo-wpf-2/MainWindow.xaml.cs

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+using System;
+using System.Windows;
+using Dark.Net;
+using Dark.Net.Wpf;
+
+namespace darknet_demo_wpf_2;
+
+public partial class MainWindow {
+    private readonly Theme windowTheme;
+    private readonly ElementSkinManager skinManager;
+    private readonly ElementSkinManager panelSkinManager;
+
+    public MainWindow() {
+        InitializeComponent();
+
+        windowTheme = Theme.Auto;
+        skinManager = new ElementSkinManager(this);
+        panelSkinManager = new ElementSkinManager(this.SpecialPanel);
+        DarkNet.Instance.SetWindowThemeWpf(this, windowTheme);
+        skinManager.RegisterSkins(new Uri("Skins/Skin.Light.xaml", UriKind.Relative), new Uri("Skins/Skin.Dark.xaml", UriKind.Relative));
+        skinManager.UpdateTheme(windowTheme);
+        panelSkinManager.RegisterSkins(new Uri("Skins/Panel.Light.xaml", UriKind.Relative), new Uri("Skins/Panel.Dark.xaml", UriKind.Relative));
+        panelSkinManager.UpdateTheme(windowTheme);
+        Console.WriteLine($"Window theme is {windowTheme}");
+    }
+
+    private void onDarkModeCheckboxChanged(object sender, RoutedEventArgs e) {
+        Theme theme = darkModeCheckbox.IsChecked switch {
+            true  => Theme.Dark,
+            false => Theme.Light,
+            null  => Theme.Auto
+        };
+        DarkNet.Instance.SetWindowThemeWpf(this, theme);
+        skinManager.UpdateTheme(theme);
+    }
+
+    private void onDarkModePanelCheckboxChanged(object sender, RoutedEventArgs e) {
+        Theme theme = darkModePanelCheckbox.IsChecked switch {
+            true  => Theme.Dark,
+            false => Theme.Light,
+            null  => Theme.Auto
+        };
+        panelSkinManager.UpdateTheme(theme);
+    }
+
+}

darknet-demo-wpf-2/Properties/PublishProfiles/FolderProfile.pubxml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+https://go.microsoft.com/fwlink/?LinkID=208121.
+-->
+<Project>
+  <PropertyGroup>
+    <Configuration>Release</Configuration>
+    <Platform>Any CPU</Platform>
+    <PublishDir>bin\Release\net6.0-windows\win-x64\publish\</PublishDir>
+    <PublishProtocol>FileSystem</PublishProtocol>
+    <TargetFramework>net6.0-windows</TargetFramework>
+    <RuntimeIdentifier>win-x64</RuntimeIdentifier>
+    <SelfContained>false</SelfContained>
+    <PublishSingleFile>true</PublishSingleFile>
+    <PublishReadyToRun>false</PublishReadyToRun>
+  </PropertyGroup>
+</Project>

darknet-demo-wpf-2/Skins/Panel.Dark.xaml

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+<!-- ReSharper disable InconsistentNaming -->
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+
+    <Style TargetType="StackPanel">
+        <Setter Property="Background" Value="MidnightBlue"></Setter>
+    </Style>
+    <Style TargetType="Label">
+        <Setter Property="Foreground" Value="White"></Setter>
+    </Style>
+
+</ResourceDictionary>

darknet-demo-wpf-2/Skins/Panel.Light.xaml

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+<!-- ReSharper disable InconsistentNaming -->
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+
+    <Style TargetType="StackPanel">
+        <Setter Property="Background" Value="LightSkyBlue"></Setter>
+    </Style>
+    <Style TargetType="Label">
+        <Setter Property="Foreground" Value="Black"></Setter>
+    </Style>
+
+</ResourceDictionary>

darknet-demo-wpf-2/Skins/Skin.Common.xaml

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+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+
+    <Style x:Key="labelStyleCommon" TargetType="Label">
+        <Setter Property="HorizontalAlignment" Value="Center" />
+        <Setter Property="VerticalAlignment" Value="Center" />
+    </Style>
+
+    <Style x:Key="checkBoxStyleCommon" TargetType="CheckBox">
+        <Setter Property="HorizontalAlignment" Value="Center" />
+        <Setter Property="Margin" Value="0,86,0,0" />
+        <Setter Property="VerticalAlignment" Value="Center" />
+    </Style>
+
+</ResourceDictionary>