UiApplication to fix Application.Current null

README.md

@@ -111,6 +111,19 @@ First, your application needs to load custom styles, add in the **MyApp\App.xaml
 </Application>
 ```
 
+If your application does not have **MyApp\App.xaml** file, use `ApplicationThemeManager.Apply(frameworkElement)` to apply/update the theme resource in the `frameworkElement`.
+
+```C#
+public partial class MainWindow
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+        ApplicationThemeManager.Apply(this);
+    }
+}
+```
+
 Now you can create fantastic apps, e.g. with one button:
 
 ```xml

Wpf.Ui.sln

@@ -44,7 +44,9 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Wpf.Ui.ToastNotifications",
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Wpf.Ui.Tray", "src\Wpf.Ui.Tray\Wpf.Ui.Tray.csproj", "{073BF126-377B-49CD-838A-E8B779EB4862}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Wpf.Ui.SyntaxHighlight", "src\Wpf.Ui.SyntaxHighlight\Wpf.Ui.SyntaxHighlight.csproj", "{07F7A65A-6061-4606-ACA2-F8D1A3D0E19A}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Wpf.Ui.SyntaxHighlight", "src\Wpf.Ui.SyntaxHighlight\Wpf.Ui.SyntaxHighlight.csproj", "{07F7A65A-6061-4606-ACA2-F8D1A3D0E19A}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Wpf.Ui.Demo.Console", "src\Wpf.Ui.Demo.Console\Wpf.Ui.Demo.Console.csproj", "{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -298,6 +300,22 @@ Global
 		{07F7A65A-6061-4606-ACA2-F8D1A3D0E19A}.Release|x64.Build.0 = Release|Any CPU
 		{07F7A65A-6061-4606-ACA2-F8D1A3D0E19A}.Release|x86.ActiveCfg = Release|Any CPU
 		{07F7A65A-6061-4606-ACA2-F8D1A3D0E19A}.Release|x86.Build.0 = Release|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Debug|arm64.ActiveCfg = Debug|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Debug|arm64.Build.0 = Debug|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Debug|x64.Build.0 = Debug|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Debug|x86.Build.0 = Debug|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Release|Any CPU.Build.0 = Release|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Release|arm64.ActiveCfg = Release|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Release|arm64.Build.0 = Release|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Release|x64.ActiveCfg = Release|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Release|x64.Build.0 = Release|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Release|x86.ActiveCfg = Release|Any CPU
+		{1FB6D1C2-B2E7-48F5-B5BA-9F0CA4F1B826}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

src/Wpf.Ui.Demo.Console/Models/DataColor.cs

@@ -0,0 +1,13 @@
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
+// Copyright (C) Leszek Pomianowski and WPF UI Contributors.
+// All Rights Reserved.
+
+using System.Windows.Media;
+
+namespace Wpf.Ui.Demo.Console.Models;
+
+public struct DataColor
+{
+    public Brush Color { get; set; }
+}

src/Wpf.Ui.Demo.Console/Program.cs

@@ -0,0 +1,30 @@
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
+// Copyright (C) Leszek Pomianowski and WPF UI Contributors.
+// All Rights Reserved.
+
+using System;
+using System.Threading;
+using System.Windows;
+
+public static class Program
+{
+    [STAThread]
+    public static void Main(string[] args)
+    {
+        if (Application.Current is null)
+            Console.WriteLine($"Application.Current is null.");
+
+        try
+        {
+            new Wpf.Ui.Demo.Console.Views.SimpleView().ShowDialog();
+            new Wpf.Ui.Demo.Console.Views.MainView().ShowDialog();
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine(ex);
+            Thread.Sleep(10000);
+            throw;
+        }
+    }
+}

src/Wpf.Ui.Demo.Console/ThemeUtils.cs

@@ -0,0 +1,122 @@
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
+// Copyright (C) Leszek Pomianowski and WPF UI Contributors.
+// All Rights Reserved.
+
+using System;
+using System.Linq;
+using System.Windows;
+using System.Windows.Media;
+using Wpf.Ui;
+using Wpf.Ui.Appearance;
+
+public static class ThemeUtils
+{
+    public static void ApplyTheme(this FrameworkElement frameworkElement)
+    {
+        ApplicationThemeManager.Apply(frameworkElement);
+
+        ThemeChangedEvent themeChanged = (sender, args) =>
+        {
+            ApplicationThemeManager.Apply(frameworkElement);
+            if (frameworkElement is Window window)
+            {
+                if (window != UiApplication.Current.MainWindow)
+                    WindowBackgroundManager.UpdateBackground(window, sender, Wpf.Ui.Controls.WindowBackdropType.None, true);
+            }
+        };
+
+        if (frameworkElement.IsLoaded)
+        {
+            ApplicationThemeManager.Changed += themeChanged;
+        }
+        frameworkElement.Loaded += (s, e) =>
+        {
+            ApplicationThemeManager.Changed += themeChanged;
+        };
+        frameworkElement.Unloaded += (s, e) =>
+        {
+            ApplicationThemeManager.Changed -= themeChanged;
+        };
+
+#if DEBUG
+        if (frameworkElement is Window window)
+        {
+            window.KeyDown += (s, e) =>
+            {
+                if (e.Key == System.Windows.Input.Key.T)
+                {
+                    ChangeTheme();
+                }
+
+                if (e.Key == System.Windows.Input.Key.C)
+                {
+                    var rnd = new Random();
+                    var randomColor = Color.FromRgb((byte)rnd.Next(256), (byte)rnd.Next(256), (byte)rnd.Next(256));
+
+                    ApplicationAccentColorManager.Apply(randomColor, ApplicationThemeManager.GetAppTheme());
+
+                    var current = ApplicationThemeManager.GetAppTheme();
+                    var applicationTheme = ApplicationThemeManager.GetAppTheme() == ApplicationTheme.Light
+                                       ? ApplicationTheme.Dark
+                                       : ApplicationTheme.Light;
+
+                    ApplicationThemeManager.Apply(applicationTheme, updateAccent: false);
+                    ApplicationThemeManager.Apply(current, updateAccent: false);
+                }
+            };
+        }
+#endif
+    }
+
+    public static void ChangeTheme()
+    {
+        var applicationTheme = ApplicationThemeManager.GetAppTheme() == ApplicationTheme.Light
+                       ? ApplicationTheme.Dark
+                       : ApplicationTheme.Light;
+
+        ApplicationThemeManager.Apply(applicationTheme, updateAccent: false);
+    }
+
+    /// <summary>
+    /// Applies Resources in the <paramref name="frameworkElement"/>.
+    /// </summary>
+    private static void Apply(FrameworkElement frameworkElement)
+    {
+        if (frameworkElement is null)
+            return;
+
+        var resourcesRemove = frameworkElement.Resources.MergedDictionaries
+            .Where(e => e.Source is not null)
+            //.Where(e => e.Source.ToString().ToLower().Contains(Wpf.Ui.Appearance.ApplicationThemeManager.LibraryNamespace))
+            .Where(e => e.Source.ToString().ToLower().Contains("Wpf.Ui;"))
+            .ToArray();
+
+        foreach (var resource in resourcesRemove)
+        {
+            //System.Console.WriteLine(
+            //    $"INFO | {typeof(MainView)} Remove {resource.Source}",
+            //    "Wpf.Ui.Appearance"
+            //);
+            frameworkElement.Resources.MergedDictionaries.Remove(resource);
+        }
+
+        foreach (var resource in UiApplication.Current.Resources.MergedDictionaries)
+        {
+            //System.Console.WriteLine(
+            //    $"INFO | {typeof(MainView)} Add {resource.Source}",
+            //    "Wpf.Ui.Appearance"
+            //);
+            frameworkElement.Resources.MergedDictionaries.Add(resource);
+        }
+
+        foreach (System.Collections.DictionaryEntry resource in UiApplication.Current.Resources)
+        {
+            //System.Console.WriteLine(
+            //    $"INFO | {typeof(MainView)} Copy Resource {resource.Key} - {resource.Value}",
+            //    "Wpf.Ui.Appearance"
+            //);
+            frameworkElement.Resources[resource.Key] = resource.Value;
+        }
+    }
+}

src/Wpf.Ui.Demo.Console/Views/MainView.xaml

@@ -0,0 +1,76 @@
+<ui:FluentWindow x:Class="Wpf.Ui.Demo.Console.Views.MainView"
+                 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"
+                 xmlns:local="clr-namespace:Wpf.Ui.Demo.Console.Views"
+                 xmlns:pages="clr-namespace:Wpf.Ui.Demo.Console.Views.Pages"
+                 xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml"
+                 Title="WPF UI - Console Demo"
+                 Width="1200"
+                 Height="654"
+                 d:DesignHeight="650"
+                 d:DesignWidth="900"
+                 ExtendsContentIntoTitleBar="True"
+                 WindowStartupLocation="CenterScreen"
+                 mc:Ignorable="d">
+
+    <ui:FluentWindow.InputBindings>
+        <KeyBinding Key="F"
+                    Command="{Binding ElementName=AutoSuggestBox, Path=FocusCommand}"
+                    Modifiers="Control" />
+    </ui:FluentWindow.InputBindings>
+
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
+        <ui:NavigationView x:Name="RootNavigation"
+                           Grid.Row="1">
+            <ui:NavigationView.AutoSuggestBox>
+                <ui:AutoSuggestBox x:Name="AutoSuggestBox"
+                                   PlaceholderText="Search">
+                    <ui:AutoSuggestBox.Icon>
+                        <ui:IconSourceElement>
+                            <ui:SymbolIconSource Symbol="Search24" />
+                        </ui:IconSourceElement>
+                    </ui:AutoSuggestBox.Icon>
+                </ui:AutoSuggestBox>
+            </ui:NavigationView.AutoSuggestBox>
+            <ui:NavigationView.Header>
+                <ui:BreadcrumbBar Margin="42,32,0,0"
+                                  FontSize="28"
+                                  FontWeight="DemiBold" />
+            </ui:NavigationView.Header>
+            <ui:NavigationView.MenuItems>
+                <ui:NavigationViewItem Content="Dashboard"
+                                       NavigationCacheMode="Enabled"
+                                       TargetPageType="{x:Type pages:DashboardPage}">
+                    <ui:NavigationViewItem.Icon>
+                        <ui:SymbolIcon Symbol="Home24" />
+                    </ui:NavigationViewItem.Icon>
+                </ui:NavigationViewItem>
+                <ui:NavigationViewItem Content="Data"
+                                       NavigationCacheMode="Enabled"
+                                       TargetPageType="{x:Type pages:DataPage}">
+                    <ui:NavigationViewItem.Icon>
+                        <ui:SymbolIcon Symbol="DataHistogram24" />
+                    </ui:NavigationViewItem.Icon>
+                </ui:NavigationViewItem>
+            </ui:NavigationView.MenuItems>
+            <ui:NavigationView.FooterMenuItems>
+                <ui:NavigationViewItem Content="Settings"
+                                       NavigationCacheMode="Enabled"
+                                       TargetPageType="{x:Type pages:SettingsPage}">
+                    <ui:NavigationViewItem.Icon>
+                        <ui:SymbolIcon Symbol="Settings24" />
+                    </ui:NavigationViewItem.Icon>
+                </ui:NavigationViewItem>
+            </ui:NavigationView.FooterMenuItems>
+        </ui:NavigationView>
+
+        <ui:TitleBar Title="WPF UI - Console Demo"
+                     Grid.Row="0"/>
+    </Grid>
+</ui:FluentWindow>

src/Wpf.Ui.Demo.Console/Views/MainView.xaml.cs

@@ -0,0 +1,27 @@
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
+// Copyright (C) Leszek Pomianowski and WPF UI Contributors.
+// All Rights Reserved.
+
+using System;
+using System.Linq;
+using System.Windows;
+using System.Windows.Media;
+using Wpf.Ui.Demo.Console.Views.Pages;
+
+namespace Wpf.Ui.Demo.Console.Views;
+public partial class MainView
+{
+    public MainView()
+    {
+        DataContext = this;
+
+        InitializeComponent();
+
+        Loaded += (_, _) => RootNavigation.Navigate(typeof(DashboardPage));
+
+        UiApplication.Current.MainWindow = this;
+
+        this.ApplyTheme();
+    }
+}

src/Wpf.Ui.Demo.Console/Views/Pages/DashboardPage.xaml

@@ -0,0 +1,35 @@
+<Page
+    x:Class="Wpf.Ui.Demo.Console.Views.Pages.DashboardPage"
+    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:local="clr-namespace:Wpf.Ui.Demo.Console.Views.Pages"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml"
+    Title="DashboardPage"
+    d:DesignHeight="450"
+    d:DesignWidth="800"
+    ui:Design.Background="{DynamicResource ApplicationBackgroundBrush}"
+    ui:Design.Foreground="{DynamicResource TextFillColorPrimaryBrush}"
+    Foreground="{DynamicResource TextFillColorPrimaryBrush}"
+    ScrollViewer.CanContentScroll="False"
+    mc:Ignorable="d">
+
+    <Grid Margin="42" VerticalAlignment="Top">
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="Auto" />
+            <ColumnDefinition Width="Auto" />
+        </Grid.ColumnDefinitions>
+
+        <ui:Button
+            Grid.Column="0"
+            Click="OnBaseButtonClick"
+            Content="Click me!"
+            Icon="{ui:SymbolIcon Fluent24}" />
+        <TextBlock
+            x:Name="CounterTextBlock"
+            Grid.Column="1"
+            Margin="12,0,0,0"
+            VerticalAlignment="Center" />
+    </Grid>
+</Page>