StabilityMatrix/StabilityMatrix.Avalonia/Views/MainWindow.axaml.cs

using System;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Interactivity;
using Avalonia.Media;
using Avalonia.Media.Immutable;
using Avalonia.Styling;
using FluentAvalonia.Styling;
using FluentAvalonia.UI.Media;
using FluentAvalonia.UI.Windowing;
using StabilityMatrix.Avalonia.Controls;
using StabilityMatrix.Avalonia.Services;

namespace StabilityMatrix.Avalonia.Views;

public partial class MainWindow : AppWindowBase
{
    public INotificationService? NotificationService { get; set; }
    
    public MainWindow()
    {
        InitializeComponent();
        
#if DEBUG
        this.AttachDevTools();
#endif
        
        TitleBar.ExtendsContentIntoTitleBar = true;
        TitleBar.TitleBarHitTestType = TitleBarHitTestType.Complex;
    }

    protected override void OnOpened(EventArgs e)
    {
        base.OnOpened(e);

        Application.Current!.ActualThemeVariantChanged += OnActualThemeVariantChanged;
        
        var theme = ActualThemeVariant;
        if (IsWindows11 && theme != FluentAvaloniaTheme.HighContrastTheme)
        {
            TryEnableMicaEffect();
        }
    }
    
    public override void OnLoaded(object? sender, RoutedEventArgs e)
    {
        base.OnLoaded(sender, e);
        NotificationService?.Initialize(this);
    }
    
    private void OnActualThemeVariantChanged(object? sender, EventArgs e)
    {
        if (IsWindows11)
        {
            if (ActualThemeVariant != FluentAvaloniaTheme.HighContrastTheme)
            {
                TryEnableMicaEffect();
            }
            else
            {
                ClearValue(BackgroundProperty);
                ClearValue(TransparencyBackgroundFallbackProperty);
            }
        }
    }
    
    private void TryEnableMicaEffect()
    {
        TransparencyBackgroundFallback = Brushes.Transparent;
        TransparencyLevelHint = new[] { WindowTransparencyLevel.Mica, WindowTransparencyLevel.Blur };
        
        if (ActualThemeVariant == ThemeVariant.Dark)
        {
            var color = this.TryFindResource("SolidBackgroundFillColorBase",
                ThemeVariant.Dark, out var value) ? (Color2)(Color)value! : new Color2(32, 32, 32);

            color = color.LightenPercent(-0.8f);

            Background = new ImmutableSolidColorBrush(color, 0.9);
        }
        else if (ActualThemeVariant == ThemeVariant.Light)
        {
            // Similar effect here
            var color = this.TryFindResource("SolidBackgroundFillColorBase",
                ThemeVariant.Light, out var value) ? (Color2)(Color)value! : new Color2(243, 243, 243);

            color = color.LightenPercent(0.5f);

            Background = new ImmutableSolidColorBrush(color, 0.9);
        }
    } 
}