Merge pull request #17 from MichaelTheShifter/shiftui_integration

Shiftui integration

1 files changed, 189 insertions, 0 deletions

diff --git a/source/ShiftUI/Internal/ListBindingHelper.cs b/source/ShiftUI/Internal/ListBindingHelper.cs
new file mode 100644
index 0000000..2615a33
--- /dev/null
+++ b/source/ShiftUI/Internal/ListBindingHelper.cs
@@ -0,0 +1,189 @@
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+// Copyright (c) 2007 Novell, Inc.
+//
+// Author:
+// 	Carlos Alberto Cortez <[email protected]>
+//      Ivan Zlatev <[email protected]>
+//
+
+using System;
+using System.Collections;
+using System.ComponentModel;
+using System.Reflection;
+using System.Collections.Generic;
+
+namespace ShiftUI
+{
+
+	public static class ListBindingHelper 
+	{
+		public static object GetList (object list)
+		{
+			if (list is IListSource)
+				return ((IListSource) list).GetList ();
+			return list;
+		}
+
+		public static object GetList (object dataSource, string dataMember)
+		{
+			dataSource = GetList (dataSource);
+			if (dataSource == null || dataMember == null || dataMember.Length == 0)
+				return dataSource;
+
+			PropertyDescriptor property = GetListItemProperties (dataSource).Find (dataMember, true);
+			if (property == null)
+				throw new ArgumentException ("dataMember");
+
+			object item = null;
+
+			ICurrencyManagerProvider currencyManagerProvider = dataSource as ICurrencyManagerProvider;
+			if (currencyManagerProvider != null && currencyManagerProvider.CurrencyManager != null) {
+				CurrencyManager currencyManager = currencyManagerProvider.CurrencyManager;
+				if (currencyManager != null && currencyManager.Count > 0 && currencyManager.Current != null)
+					item = currencyManager.Current;
+			}
+
+			if (item == null) {
+				if (dataSource is IEnumerable) {
+					if (dataSource is IList) {
+						IList list = (IList) dataSource;
+						item = list.Count > 0 ? list[0] : null;
+					} else {
+						IEnumerator e = ((IEnumerable) dataSource).GetEnumerator ();
+						if (e != null && e.MoveNext ())
+							item = e.Current;
+					}
+				} else {
+					item = dataSource;
+				}
+			}
+
+			if (item != null)
+				return property.GetValue (item);
+			return null;
+		}
+
+		public static Type GetListItemType (object list)
+		{
+			return GetListItemType (list, String.Empty);
+		}
+
+		public static Type GetListItemType (object dataSource, string dataMember)
+		{
+			if (dataSource == null)
+				return null;
+
+			if (dataMember != null && dataMember.Length > 0) {
+				PropertyDescriptor property = GetProperty (dataSource, dataMember);
+				if (property == null)
+					return typeof (object);
+
+				return property.PropertyType;
+			}
+
+			if (dataSource is Array)
+				return dataSource.GetType ().GetElementType ();
+
+			// IEnumerable seems to have higher precedence over IList
+			if (dataSource is IEnumerable) {
+				IEnumerator enumerator = ((IEnumerable) dataSource).GetEnumerator ();
+				if (enumerator.MoveNext () && enumerator.Current != null)
+					return enumerator.Current.GetType ();
+
+				if (dataSource is IList || dataSource.GetType () == typeof (IList<>)) {
+					PropertyInfo property = GetPropertyByReflection (dataSource.GetType (), "Item");
+					if (property != null) // `Item' could be interface-explicit, and thus private
+						return property.PropertyType;
+				}
+
+				// fallback to object
+				return typeof (object);
+			}
+
+			return dataSource.GetType ();
+		}
+
+		public static PropertyDescriptorCollection GetListItemProperties (object list)
+		{
+			return GetListItemProperties (list, null);
+		}
+
+		public static PropertyDescriptorCollection GetListItemProperties (object list, PropertyDescriptor [] listAccessors)
+		{
+			list = GetList (list);
+
+			if (list == null)
+				return new PropertyDescriptorCollection (null);
+
+			if (list is ITypedList)
+				return ((ITypedList)list).GetItemProperties (listAccessors);
+
+			if (listAccessors == null || listAccessors.Length == 0) {
+				Type item_type = GetListItemType (list);
+				return TypeDescriptor.GetProperties (item_type, 
+					new Attribute [] { new BrowsableAttribute (true) });
+			}
+
+			// Take into account only the first property
+			Type property_type = listAccessors [0].PropertyType;
+			if (typeof (IList).IsAssignableFrom (property_type) || typeof (IList<>).IsAssignableFrom (property_type)) {
+
+				PropertyInfo property = GetPropertyByReflection (property_type, "Item");
+				return TypeDescriptor.GetProperties (property.PropertyType);
+			}
+
+			return new PropertyDescriptorCollection (new PropertyDescriptor [0]);
+		}
+
+		public static PropertyDescriptorCollection GetListItemProperties (object dataSource, string dataMember, 
+			PropertyDescriptor [] listAccessors)
+		{
+			throw new NotImplementedException ();
+		}
+
+		public static string GetListName (object list, PropertyDescriptor [] listAccessors)
+		{
+			if (list == null)
+				return String.Empty;
+
+			Type item_type = GetListItemType (list);
+			return item_type.Name;
+		}
+
+		static PropertyDescriptor GetProperty (object obj, string property_name)
+		{
+			return TypeDescriptor.GetProperties (obj, 
+							     new Attribute [] { new BrowsableAttribute (true) })[property_name];
+		}
+
+		// 
+		// Need to use reflection as we need to bypass the TypeDescriptor.GetProperties () limitations
+		//
+		static PropertyInfo GetPropertyByReflection (Type type, string property_name)
+		{
+			foreach (PropertyInfo prop in type.GetProperties (BindingFlags.Public | BindingFlags.Instance))
+				if (prop.Name == property_name)
+					return prop;
+
+			return null;
+		}
+	}
+}