Adjust project structure

src/Shared/HandyControl_Shared/Controls/Attach/EdgeElement.cs

@@ -0,0 +1,47 @@
+using System.Windows;
+using HandyControl.Data;
+
+namespace HandyControl.Controls
+{
+    public class EdgeElement
+    {
+        public static readonly DependencyProperty LeftContentProperty = DependencyProperty.RegisterAttached(
+            "LeftContent", typeof(object), typeof(EdgeElement), new PropertyMetadata(default(object), OnEdgeContentChanged));
+
+        public static void SetLeftContent(DependencyObject element, object value) => element.SetValue(LeftContentProperty, value);
+
+        public static object GetLeftContent(DependencyObject element) => element.GetValue(LeftContentProperty);
+
+        public static readonly DependencyProperty TopContentProperty = DependencyProperty.RegisterAttached(
+            "TopContent", typeof(object), typeof(EdgeElement), new PropertyMetadata(default(object), OnEdgeContentChanged));
+
+        public static void SetTopContent(DependencyObject element, object value) => element.SetValue(TopContentProperty, value);
+
+        public static object GetTopContent(DependencyObject element) => element.GetValue(TopContentProperty);
+
+        public static readonly DependencyProperty RightContentProperty = DependencyProperty.RegisterAttached(
+            "RightContent", typeof(object), typeof(EdgeElement), new PropertyMetadata(default(object), OnEdgeContentChanged));
+
+        public static void SetRightContent(DependencyObject element, object value) => element.SetValue(RightContentProperty, value);
+
+        public static object GetRightContent(DependencyObject element) => element.GetValue(RightContentProperty);
+
+        public static readonly DependencyProperty BottomContentProperty = DependencyProperty.RegisterAttached(
+            "BottomContent", typeof(object), typeof(EdgeElement), new PropertyMetadata(default(object), OnEdgeContentChanged));
+
+        public static void SetBottomContent(DependencyObject element, object value) => element.SetValue(BottomContentProperty, value);
+
+        public static object GetBottomContent(DependencyObject element) => element.GetValue(BottomContentProperty);
+
+        public static readonly DependencyProperty ShowEdgeContentProperty = DependencyProperty.RegisterAttached(
+            "ShowEdgeContent", typeof(bool), typeof(EdgeElement), new PropertyMetadata(ValueBoxes.FalseBox));
+
+        public static void SetShowEdgeContent(DependencyObject element, bool value) => element.SetValue(ShowEdgeContentProperty, value);
+
+        public static bool GetShowEdgeContent(DependencyObject element) => (bool) element.GetValue(ShowEdgeContentProperty);
+
+        private static void OnEdgeContentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) =>
+            SetShowEdgeContent(d, !(GetLeftContent(d) == null && GetTopContent(d) == null &&
+                                    GetRightContent(d) == null && GetBottomContent(d) == null));
+    }
+}