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

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

namespace YZWater.Avalonia.Views;

public partial class ViewEView : UserControl
{
    public ViewEView()
    {
        InitializeComponent();
        AttachedToVisualTree += (_, _) =>
        {
            // 遍历视觉树设置背景
            foreach (var v in this.GetVisualDescendants())
            {
                if (v is Border b)
                {
                    if (b.Name == "TitleBar") b.Background = ThemeHelper.HeaderBg;
                    else if (b.Name == "StatusBar") b.Background = ThemeHelper.NavBg;
                    else if (b.Name == "RootBorder") b.Background = ThemeHelper.AppBg;
                }
                else if (v is TextBlock tb)
                {
                    if (tb.Name == "TitleText") tb.Foreground = ThemeHelper.HeaderText;
                    else if (tb.Name == "SubtitleText") tb.Foreground = ThemeHelper.HeaderSubtext;
                }
            }
            ThemeHelper.ThemeChanged += ApplyTheme;
        };
        DetachedFromVisualTree += (_, _) => ThemeHelper.ThemeChanged -= ApplyTheme;
    }

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