整理整理

AIStudio.Wpf.DiagramDesigner.Additionals/Converters/ThicknessBindingConverter.cs

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+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace AIStudio.Wpf.DiagramDesigner.Additionals.Converters
+{
+    /// <summary>
+    /// Converts a Thickness to a new Thickness. It's possible to ignore a side With the IgnoreThicknessSide property.
+    /// </summary>
+    public class ThicknessBindingConverter : IValueConverter
+    {
+        public IgnoreThicknessSideType IgnoreThicknessSide { get; set; }
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is Thickness)
+            {
+                // yes, we can override it with the parameter value
+                if (parameter is IgnoreThicknessSideType)
+                {
+                    this.IgnoreThicknessSide = (IgnoreThicknessSideType)parameter;
+                }
+                var orgThickness = (Thickness)value;
+                switch (this.IgnoreThicknessSide)
+                {
+                    case IgnoreThicknessSideType.Left:
+                        return new Thickness(0, orgThickness.Top, orgThickness.Right, orgThickness.Bottom);
+                    case IgnoreThicknessSideType.Top:
+                        return new Thickness(orgThickness.Left, 0, orgThickness.Right, orgThickness.Bottom);
+                    case IgnoreThicknessSideType.Right:
+                        return new Thickness(orgThickness.Left, orgThickness.Top, 0, orgThickness.Bottom);
+                    case IgnoreThicknessSideType.Bottom:
+                        return new Thickness(orgThickness.Left, orgThickness.Top, orgThickness.Right, 0);
+                    default:
+                        return orgThickness;
+                }
+            }
+            return default(Thickness);
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            // for now no back converting
+            return DependencyProperty.UnsetValue;
+        }
+    }
+
+    public enum IgnoreThicknessSideType
+    {
+        /// <summary>
+        /// Use all sides.
+        /// </summary>
+        None,
+        /// <summary>
+        /// Ignore the left side.
+        /// </summary>
+        Left,
+        /// <summary>
+        /// Ignore the top side.
+        /// </summary>
+        Top,
+        /// <summary>
+        /// Ignore the right side.
+        /// </summary>
+        Right,
+        /// <summary>
+        /// Ignore the bottom side.
+        /// </summary>
+        Bottom
+    }
+}