YZWater3/src/YZWater.Avalonia/Controls/ThemeHelper.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Media;

namespace YZWater.Avalonia.Controls;

/// <summary>
/// 主题资源辅助方法
/// </summary>
internal static class ThemeHelper
{
    /// <summary>
    /// 从应用资源获取画刷，找不到则返回默认值
    /// </summary>
    public static IBrush GetBrush(string key, string fallbackHex)
    {
        try
        {
            // 遍历所有 MergedDictionaries 查找资源
            var app = Application.Current;
            if (app?.Resources?.MergedDictionaries != null)
            {
                foreach (var dict in app.Resources.MergedDictionaries)
                {
                    if (dict.TryGetResource(key, null, out var value) && value is IBrush brush)
                        return brush;
                }
            }
            // 尝试从根资源查找
            if (app != null && app.Resources.TryGetResource(key, null, out var rootValue) && rootValue is IBrush rootBrush)
                return rootBrush;
        }
        catch { }
        return new SolidColorBrush(Color.Parse(fallbackHex));
    }

    /// <summary>
    /// 通知所有控件重绘（在主题切换后调用）
    /// </summary>
    public static void InvalidateAll()
    {
        if (Application.Current?.ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
        {
            foreach (var window in desktop.Windows)
            {
                window.InvalidateVisual();
            }
        }
    }

    // 常用快捷方法
    public static IBrush AppBg() => GetBrush("AppBgBrush", "#0A0E14");
    public static IBrush SurfaceBg() => GetBrush("SurfaceBgBrush", "#111820");
    public static IBrush PanelBg() => GetBrush("PanelBgBrush", "#0D1117");
    public static IBrush Border() => GetBrush("BorderBrush", "#1C2333");
    public static IBrush TextPrimary() => GetBrush("TextPrimaryBrush", "#E6EDF3");
    public static IBrush TextSecondary() => GetBrush("TextSecondaryBrush", "#9CA3AF");
    public static IBrush TextTertiary() => GetBrush("TextTertiaryBrush", "#6B7280");
    public static IBrush TextDisabled() => GetBrush("TextDisabledBrush", "#4B5563");
    public static IBrush Success() => GetBrush("SuccessBrush", "#00897B");
    public static IBrush Warning() => GetBrush("WarningBrush", "#F59E0B");
    public static IBrush Danger() => GetBrush("DangerBrush", "#EF4444");
    public static IBrush Info() => GetBrush("InfoBrush", "#3B82F6");
    public static IBrush HeaderBg() => GetBrush("HeaderBgBrush", "#111820");
    public static IBrush HeaderText() => GetBrush("HeaderTextBrush", "#E6EDF3");
    public static IBrush HeaderSubtext() => GetBrush("HeaderSubtextBrush", "#9CA3AF");
    public static IBrush NavBg() => GetBrush("NavBgBrush", "#111820");
}