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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) 2004-2005 Novell, Inc.
//
// Authors:
// Peter Bartok pbartok@novell.com
// Jackson Harper jackson@ximian.com
using System.Collections;
using System.Globalization;
using System.ComponentModel;
namespace System.Windows.Forms {
[DefaultEvent("CollectionChanged")]
public class BindingContext : ICollection, IEnumerable {
private Hashtable managers;
private class ManagerEntry {
private object source;
private WeakReference member_ref;
private int member_hash;
public ManagerEntry (object source, string member)
{
this.source = source;
if (member == null)
member = String.Empty;
member_hash = member.ToLower (CultureInfo.InvariantCulture).GetHashCode ();
if (member_hash == 0)
member_hash = 1;
member_ref = new WeakReference (member, false);
}
public override bool Equals (object b)
{
ManagerEntry o = (ManagerEntry) b;
return (o.source == source && o.member_ref.Target == member_ref.Target);
}
public override int GetHashCode ()
{
return member_hash * source.GetHashCode ();
}
public override string ToString ()
{
return source.ToString () + " + " + (member_ref.Target == null ? " -- null --" : member_ref.Target.ToString ());
}
}
public BindingContext ()
{
managers = new Hashtable ();
}
public bool IsReadOnly {
get {
return false;
}
}
public BindingManagerBase this [object dataSource] {
get {
return this [dataSource, String.Empty];
}
}
public BindingManagerBase this [object data_source, string data_member] {
get {
ManagerEntry e = CreateEntry (data_source, data_member);
WeakReference wref = managers [e] as WeakReference;
if (wref != null && wref.Target != null)
return wref.Target as BindingManagerBase;
BindingManagerBase res = AddManager (data_source, data_member);
return res;
}
}
private BindingManagerBase AddManager (object data_source, string data_member)
{
BindingManagerBase res = CreateBindingManager (data_source, data_member);
managers [CreateEntry (data_source, data_member)] = new WeakReference (res);
return res;
}
private BindingManagerBase CreateBindingManager (object data_source,
string data_member)
{
if (data_source is IList ||
data_source is IListSource ||
data_source is IBindingList) {
CurrencyManager res = new CurrencyManager (data_source);
return res;
}
return new PropertyManager (data_source, data_member);
}
#region Public Instance Methods
public bool Contains(object dataSource)
{
return Contains (dataSource, String.Empty);
}
public bool Contains (object dataSource, string dataMember)
{
ManagerEntry entry = CreateEntry (dataSource, dataMember);
return managers.ContainsKey (entry);
}
#endregion // Public Instance Methods
#region Protected Instance Methods
protected internal void Add (object dataSource, BindingManagerBase listManager)
{
AddCore (dataSource, listManager);
OnCollectionChanged (new CollectionChangeEventArgs (CollectionChangeAction.Add, dataSource));
}
protected virtual void AddCore (object dataSource, BindingManagerBase listManager)
{
if (dataSource == null)
throw new ArgumentNullException ("dataSource");
if (listManager == null)
throw new ArgumentNullException ("listManager");
managers.Add (CreateEntry (dataSource, String.Empty), new WeakReference (listManager));
}
protected internal void Clear ()
{
ClearCore();
OnCollectionChanged (new CollectionChangeEventArgs (CollectionChangeAction.Refresh, null));
}
protected virtual void ClearCore ()
{
managers.Clear ();
}
protected virtual void OnCollectionChanged(System.ComponentModel.CollectionChangeEventArgs ccevent)
{
if (CollectionChanged != null) {
CollectionChanged (this, ccevent);
}
}
protected internal void Remove (object dataSource)
{
RemoveCore (dataSource);
OnCollectionChanged (new CollectionChangeEventArgs (CollectionChangeAction.Remove, dataSource));
}
protected virtual void RemoveCore (object dataSource)
{
managers.Remove (CreateEntry (dataSource, String.Empty));
}
#endregion // Protected Instance Methods
#region Events
public event CollectionChangeEventHandler CollectionChanged;
#endregion // Events
#region ICollection Interfaces
void ICollection.CopyTo (Array array, int index)
{
managers.CopyTo (array, index);
}
int ICollection.Count {
get {
return managers.Count;
}
}
bool ICollection.IsSynchronized {
get {
return false;
}
}
object ICollection.SyncRoot {
get {
return null;
}
}
#endregion // ICollection Interfaces
#region IEnumerable Interfaces
[MonoTODO]
IEnumerator IEnumerable.GetEnumerator() {
throw new NotImplementedException();
}
#endregion // IEnumerable Interfaces
private ManagerEntry CreateEntry (object dataSource, string dataMember)
{
return new ManagerEntry (dataSource, dataMember);
}
}
}
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