页面视图新增缩略图模式

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

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+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace AIStudio.Wpf.DiagramDesigner.Additionals.Converters
+{
+    public class CardClipConverter : IMultiValueConverter
+    {
+        /// <summary>
+        /// 1 - Content presenter render size,
+        /// 2 - Clipping border padding (main control padding)
+        /// </summary>
+        /// <param name="values"></param>
+        /// <param name="targetType"></param>
+        /// <param name="parameter"></param>
+        /// <param name="culture"></param>
+        /// <returns></returns>
+        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (values.Length != 2 || !(values[0] is Size) || !(values[1] is Thickness))
+                return Binding.DoNothing;
+
+            var size = (Size)values[0];
+            var farPoint = new Point(
+                Math.Max(0, size.Width),
+                Math.Max(0, size.Height));
+            var padding = (Thickness)values[1];
+            farPoint.Offset(padding.Left + padding.Right, padding.Top + padding.Bottom);
+
+            return new Rect(
+                new Point(),
+                new Point(farPoint.X, farPoint.Y));
+        }
+
+        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
+        {
+            return null;
+        }
+    }
+}

AIStudio.Wpf.DiagramDesigner.Additionals/Converters/Object2VisibilityConverter.cs

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+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace AIStudio.Wpf.DiagramDesigner.Additionals.Converters
+{
+    public class Object2VisibilityConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return value == null ? Visibility.Collapsed : Visibility.Visible;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}