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// 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 <calberto.cortez@gmail.com>
// Ivan Zlatev <contact@i-nz.net>
//
using System;
using System.Collections;
using System.ComponentModel;
using System.Reflection;
using System.Collections.Generic;
namespace System.Windows.Forms
{
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;
}
}
}
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