增加背景颜色参数

SpineViewer/Exporter/ExportArgs.cs

@@ -67,10 +67,12 @@ namespace SpineViewer.Exporter
         public bool RenderSelectedOnly { get; }
 
         /// <summary>
-        /// 背景颜色 TODO: 提供颜色编辑
+        /// 背景颜色
         /// </summary>
+        [Editor(typeof(SFMLColorEditor), typeof(UITypeEditor))]
+        [TypeConverter(typeof(SFMLColorConverter))]
         [Category("[0] 导出"), DisplayName("背景颜色"), Description("要使用的背景色, 格式为 #RRGGBBAA")]
-        public SFML.Graphics.Color BackgroundColor { get; set; } = SFML.Graphics.Color.Transparent;
+        public SFML.Graphics.Color BackgroundColor { get; set; } = new(0, 255, 0, 0);
 
         /// <summary>
         /// 检查参数是否合法并规范化参数值, 否则返回用户错误原因

SpineViewer/Exporter/TypeConverter.cs

@@ -23,4 +23,81 @@ namespace SpineViewer.Exporter
             return new StandardValuesCollection(supportedFileSuffix);
         }
     }
+
+    public class SFMLColorConverter : ExpandableObjectConverter
+    {
+        private class SFMLColorPropertyDescriptor : SimplePropertyDescriptor
+        {
+            public SFMLColorPropertyDescriptor(Type componentType, string name, Type propertyType) : base(componentType, name, propertyType) { }
+
+            public override object? GetValue(object? component)
+            {
+                return component?.GetType().GetField(Name)?.GetValue(component) ?? default;
+            }
+
+            public override void SetValue(object? component, object? value)
+            {
+                component?.GetType().GetField(Name)?.SetValue(component, value);
+            }
+        }
+
+        public override bool CanConvertFrom(ITypeDescriptorContext? context, Type sourceType)
+        {
+            return sourceType == typeof(string) || base.CanConvertFrom(context, sourceType);
+        }
+
+        public override object? ConvertFrom(ITypeDescriptorContext? context, CultureInfo? culture, object value)
+        {
+            if (value is string s)
+            {
+                s = s.Trim();
+                if (s.StartsWith("#") && s.Length == 9)
+                {
+                    try
+                    {
+                        // 解析 R, G, B, A 分量，注意16进制解析
+                        byte r = byte.Parse(s.Substring(1, 2), NumberStyles.HexNumber);
+                        byte g = byte.Parse(s.Substring(3, 2), NumberStyles.HexNumber);
+                        byte b = byte.Parse(s.Substring(5, 2), NumberStyles.HexNumber);
+                        byte a = byte.Parse(s.Substring(7, 2), NumberStyles.HexNumber);
+                        return new SFML.Graphics.Color(r, g, b, a);
+                    }
+                    catch (Exception ex)
+                    {
+                        throw new FormatException("无法解析颜色，确保格式为 #RRGGBBAA", ex);
+                    }
+                }
+                throw new FormatException("格式错误，正确格式为 #RRGGBBAA");
+            }
+            return base.ConvertFrom(context, culture, value);
+        }
+
+        public override bool CanConvertTo(ITypeDescriptorContext? context, Type? destinationType)
+        {
+            return destinationType == typeof(string) || base.CanConvertTo(context, destinationType);
+        }
+
+        public override object? ConvertTo(ITypeDescriptorContext? context, CultureInfo? culture, object? value, Type destinationType)
+        {
+            if (destinationType == typeof(string) && value is SFML.Graphics.Color color)
+                return $"#{color.R:X2}{color.G:X2}{color.B:X2}{color.A:X2}";
+            return base.ConvertTo(context, culture, value, destinationType);
+        }
+
+        public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext? context, object value, Attribute[]? attributes)
+        {
+            // 自定义属性集合
+            var properties = new List<PropertyDescriptor>
+            {
+                // 定义 R, G, B, A 四个字段的描述器
+                new SFMLColorPropertyDescriptor(typeof(SFML.Graphics.Color), "R", typeof(byte)),
+                new SFMLColorPropertyDescriptor(typeof(SFML.Graphics.Color), "G", typeof(byte)),
+                new SFMLColorPropertyDescriptor(typeof(SFML.Graphics.Color), "B", typeof(byte)),
+                new SFMLColorPropertyDescriptor(typeof(SFML.Graphics.Color), "A", typeof(byte))
+            };
+
+            // 返回自定义属性集合
+            return new PropertyDescriptorCollection(properties.ToArray());
+        }
+    }
 }

SpineViewer/Exporter/UITypeEditor.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Drawing.Design;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SpineViewer.Exporter
+{
+    class SFMLColorEditor : UITypeEditor
+    {
+        public override bool GetPaintValueSupported(ITypeDescriptorContext? context) => true;
+
+        public override void PaintValue(PaintValueEventArgs e)
+        {
+            if (e.Value is SFML.Graphics.Color color)
+            {
+                // 定义颜色和透明度的绘制区域
+                var colorBox = new Rectangle(e.Bounds.X, e.Bounds.Y, e.Bounds.Width / 2, e.Bounds.Height);
+                var alphaBox = new Rectangle(e.Bounds.X + e.Bounds.Width / 2, e.Bounds.Y, e.Bounds.Width / 2, e.Bounds.Height);
+
+                // 转换为 System.Drawing.Color
+                var drawColor = Color.FromArgb(color.A, color.R, color.G, color.B);
+
+                // 绘制纯颜色（RGB 部分）
+                using (var brush = new SolidBrush(Color.FromArgb(color.R, color.G, color.B)))
+                {
+                    e.Graphics.FillRectangle(brush, colorBox);
+                    e.Graphics.DrawRectangle(Pens.Black, colorBox);
+                }
+
+                // 绘制带透明度效果的颜色
+                using (var checkerBrush = CreateTransparencyBrush())
+                {
+                    e.Graphics.FillRectangle(checkerBrush, alphaBox); // 背景棋盘格
+                }
+                using (var brush = new SolidBrush(drawColor))
+                {
+                    e.Graphics.FillRectangle(brush, alphaBox); // 叠加透明颜色
+                    e.Graphics.DrawRectangle(Pens.Black, alphaBox);
+                }
+            }
+            else
+            {
+                base.PaintValue(e);
+            }
+        }
+
+        // 创建一个透明背景的棋盘格图案画刷
+        private static TextureBrush CreateTransparencyBrush()
+        {
+            var bitmap = new Bitmap(8, 8);
+            using (var g = Graphics.FromImage(bitmap))
+            {
+                g.Clear(Color.White);
+                using (var grayBrush = new SolidBrush(Color.LightGray))
+                {
+                    g.FillRectangle(grayBrush, 0, 0, 4, 4);
+                    g.FillRectangle(grayBrush, 4, 4, 4, 4);
+                }
+            }
+            return new TextureBrush(bitmap);
+        }
+    }
+}