MyAvaloniaDemo/AuroraDesk.Presentation/Converters/StringConverters.cs

using Avalonia.Data.Converters;
using Avalonia.Media;
using HeroIconsAvalonia.Enums;
using System;
using System.Globalization;

namespace AuroraDesk.Presentation.Converters;

/// <summary>
/// 字符串转换器类
/// </summary>
public static class StringConverters
{
    /// <summary>
    /// 角色到颜色的转换器
    /// </summary>
    public static readonly IValueConverter RoleToColorConverter = new RoleToColorConverter();

    /// <summary>
    /// 状态到颜色的转换器
    /// </summary>
    public static readonly IValueConverter StatusToColorConverter = new StatusToColorConverter();

    /// <summary>
    /// 空值到布尔值的转换器
    /// </summary>
    public static readonly IValueConverter NullToBoolConverter = new NullToBoolConverter();

    /// <summary>
    /// 布尔值到图标类型的转换器
    /// </summary>
    public static readonly IValueConverter BoolToIconConverter = new BoolToIconConverter();

    /// <summary>
    /// 布尔值到颜色的转换器（用于连接状态）
    /// </summary>
    public static readonly IValueConverter BoolToBrushConverter = new BoolToBrushConverter();

    /// <summary>
    /// 字符串到可见性的转换器（非空则可见）
    /// </summary>
    public static readonly IValueConverter StringToVisibilityConverter = new StringToVisibilityConverter();

    /// <summary>
    /// 整数到可见性的转换器（0 则不可见）
    /// </summary>
    public static readonly IValueConverter IntToVisibilityConverter = new IntToVisibilityConverter();

    /// <summary>
    /// 字符串非空检查转换器（非空则返回 true）
    /// </summary>
    public static readonly IValueConverter IsNotNullOrEmptyConverter = new IsNotNullOrEmptyConverter();

    /// <summary>
    /// 布尔值到可见性转换器
    /// </summary>
    public static readonly IValueConverter BoolToVisibilityConverter = new BoolToVisibilityConverter();
}

/// <summary>
/// 角色到颜色转换器
/// </summary>
public class RoleToColorConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (value is string role)
        {
            return role switch
            {
                "管理员" => new SolidColorBrush(Color.FromRgb(220, 53, 69)), // 红色
                "编辑" => new SolidColorBrush(Color.FromRgb(255, 193, 7)),   // 黄色
                "用户" => new SolidColorBrush(Color.FromRgb(40, 167, 69)),   // 绿色
                _ => new SolidColorBrush(Color.FromRgb(108, 117, 125))       // 灰色
            };
        }
        return new SolidColorBrush(Color.FromRgb(108, 117, 125));
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

/// <summary>
/// 状态到颜色转换器
/// </summary>
public class StatusToColorConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (value is string status)
        {
            return status switch
            {
                "在线" => new SolidColorBrush(Color.FromRgb(40, 167, 69)),   // 绿色
                "离线" => new SolidColorBrush(Color.FromRgb(108, 117, 125)), // 灰色
                "忙碌" => new SolidColorBrush(Color.FromRgb(220, 53, 69)),   // 红色
                _ => new SolidColorBrush(Color.FromRgb(108, 117, 125))       // 灰色
            };
        }
        return new SolidColorBrush(Color.FromRgb(108, 117, 125));
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

/// <summary>
/// 空值到布尔值转换器
/// </summary>
public class NullToBoolConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        return value != null;
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

/// <summary>
/// 空值到布尔值转换器（取反）
/// </summary>
public class NullToInverseBoolConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        return value == null;
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

/// <summary>
/// 布尔值到图标类型转换器
/// </summary>
public class BoolToIconConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (value is bool isExpanded)
        {
            return isExpanded ? IconType.ChevronDown : IconType.ChevronRight;
        }
        return IconType.ChevronRight;
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

/// <summary>
/// 布尔值到画刷转换器（用于连接状态颜色）
/// </summary>
public class BoolToBrushConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (value is bool isConnected)
        {
            return isConnected 
                ? new SolidColorBrush(Color.FromRgb(40, 167, 69))   // 绿色 - 已连接
                : new SolidColorBrush(Color.FromRgb(108, 117, 125)); // 灰色 - 未连接
        }
        return new SolidColorBrush(Color.FromRgb(108, 117, 125));
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

/// <summary>
/// 字符串到可见性转换器（非空则可见）
/// </summary>
public class StringToVisibilityConverter : IValueConverter
{
    public static StringToVisibilityConverter Instance { get; } = new();

    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        return !string.IsNullOrEmpty(value?.ToString());
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

/// <summary>
/// 整数到可见性转换器（0 则不可见，用于空列表提示）
/// </summary>
public class IntToVisibilityConverter : IValueConverter
{
    public static IntToVisibilityConverter Instance { get; } = new();

    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (value is int count)
        {
            return count == 0;
        }
        return false;
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

/// <summary>
/// 字符串非空检查转换器（非空则返回 true）
/// </summary>
public class IsNotNullOrEmptyConverter : IValueConverter
{
    public static IsNotNullOrEmptyConverter Instance { get; } = new();

    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        return !string.IsNullOrEmpty(value?.ToString());
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

/// <summary>
/// 布尔值到可见性转换器
/// </summary>
public class BoolToVisibilityConverter : IValueConverter
{
    public static BoolToVisibilityConverter Instance { get; } = new();

    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (value is bool boolValue)
        {
            // 如果 parameter 是 "Invert"，则反转布尔值
            if (parameter?.ToString() == "Invert")
            {
                return !boolValue;
            }
            return boolValue;
        }
        return false;
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}