YZWater3/src/YZWater.Avalonia/Views/ViewBView.axaml.cs

using Avalonia.Controls;
using Avalonia.VisualTree;
using YZWater.Avalonia.Controls;

namespace YZWater.Avalonia.Views;

public partial class ViewBView : UserControl
{
    public ViewBView()
    {
        InitializeComponent();
        AttachedToVisualTree += (_, _) =>
        {
            ApplyTheme();
            ThemeHelper.ThemeChanged += ApplyTheme;
        };
        DetachedFromVisualTree += (_, _) =>
        {
            ThemeHelper.ThemeChanged -= ApplyTheme;
        };
    }

    private void ApplyTheme()
    {
        foreach (var visual in this.GetVisualDescendants())
        {
            if (visual is Border border && border.Name == "TitleBar")
                border.Background = ThemeHelper.HeaderBg;
            else if (visual is Border sb && sb.Name == "StatusBar")
                sb.Background = ThemeHelper.NavBg;
            else if (visual is Border rb && rb.Name == "RootBorder")
                rb.Background = ThemeHelper.AppBg;
            else if (visual is TextBlock tb && tb.Name == "TitleText")
                tb.Foreground = ThemeHelper.HeaderText;
            else if (visual is TextBlock stb && stb.Name == "SubtitleText")
                stb.Foreground = ThemeHelper.HeaderSubtext;
        }
    }
}