1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257
|
// 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.Data;
using System.Collections;
using System.Globalization;
using System.ComponentModel;
namespace System.Windows.Forms {
[DefaultEvent("CollectionChanged")]
public class BindingContext : ICollection, IEnumerable {
private Hashtable managers;
private EventHandler onCollectionChangedHandler;
private class HashKey {
public object source;
public string member;
public HashKey (object source, string member)
{
this.source = source;
this.member = member;
}
public override int GetHashCode ()
{
return source.GetHashCode() ^ member.GetHashCode ();
}
public override bool Equals (object o)
{
HashKey hk = o as HashKey;
if (hk == null)
return false;
return hk.source == source && hk.member == member;
}
}
public BindingContext ()
{
managers = new Hashtable ();
onCollectionChangedHandler = null;
}
public bool IsReadOnly {
get { return false; }
}
public BindingManagerBase this [object dataSource] {
get { return this [dataSource, String.Empty]; }
}
public BindingManagerBase this [object dataSource, string dataMember] {
get {
if (dataSource == null)
throw new ArgumentNullException ("dataSource");
if (dataMember == null)
dataMember = String.Empty;
ICurrencyManagerProvider cm_provider = dataSource as ICurrencyManagerProvider;
if (cm_provider != null) {
if (dataMember.Length == 0)
return cm_provider.CurrencyManager;
return cm_provider.GetRelatedCurrencyManager (dataMember);
}
HashKey key = new HashKey (dataSource, dataMember);
BindingManagerBase res = managers [key] as BindingManagerBase;
if (res != null)
return res;
res = CreateBindingManager (dataSource, dataMember);
if (res == null)
return null;
managers [key] = res;
return res;
}
}
private BindingManagerBase CreateBindingManager (object data_source, string data_member)
{
if (data_member == "") {
if (IsListType (data_source.GetType ()))
return new CurrencyManager (data_source);
else
return new PropertyManager (data_source);
}
else {
BindingMemberInfo info = new BindingMemberInfo (data_member);
BindingManagerBase parent_manager = this[data_source, info.BindingPath];
PropertyDescriptor pd = parent_manager == null ? null : parent_manager.GetItemProperties ().Find (info.BindingField, true);
if (pd == null)
throw new ArgumentException (String.Format ("Cannot create a child list for field {0}.", info.BindingField));
if (IsListType (pd.PropertyType))
return new RelatedCurrencyManager (parent_manager, pd);
else
return new RelatedPropertyManager (parent_manager, info.BindingField);
}
}
bool IsListType (Type t)
{
return (typeof (IList).IsAssignableFrom (t)
|| typeof (IListSource).IsAssignableFrom (t));
}
#region Public Instance Methods
public bool Contains(object dataSource)
{
return Contains (dataSource, String.Empty);
}
public bool Contains (object dataSource, string dataMember)
{
if (dataSource == null)
throw new ArgumentNullException ("dataSource");
if (dataMember == null)
dataMember = String.Empty;
HashKey key = new HashKey (dataSource, dataMember);
return managers [key] != null;
}
#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");
HashKey key = new HashKey (dataSource, String.Empty);
managers [key] = listManager;
}
protected internal void Clear ()
{
ClearCore();
OnCollectionChanged (new CollectionChangeEventArgs (CollectionChangeAction.Refresh, null));
}
protected virtual void ClearCore ()
{
managers.Clear ();
}
protected virtual void OnCollectionChanged (CollectionChangeEventArgs ccevent)
{
if (onCollectionChangedHandler != null) {
onCollectionChangedHandler (this, ccevent);
}
}
protected internal void Remove (object dataSource)
{
if (dataSource == null)
throw new ArgumentNullException ("dataSource");
RemoveCore (dataSource);
OnCollectionChanged (new CollectionChangeEventArgs (CollectionChangeAction.Remove, dataSource));
}
protected virtual void RemoveCore (object dataSource)
{
HashKey[] keys = new HashKey [managers.Keys.Count];
managers.Keys.CopyTo (keys, 0);
for (int i = 0; i < keys.Length; i ++) {
if (keys[i].source == dataSource)
managers.Remove (keys[i]);
}
}
[MonoTODO ("Stub, does nothing")]
public static void UpdateBinding (BindingContext newBindingContext, Binding binding)
{
}
#endregion // Protected Instance Methods
#region Events
[Browsable (false)]
[EditorBrowsable (EditorBrowsableState.Never)]
public event CollectionChangeEventHandler CollectionChanged {
add { throw new NotImplementedException (); }
remove { /* nothing to do here.. */ }
}
#endregion // Events
#region ICollection Interfaces
void ICollection.CopyTo (Array ar, int index)
{
managers.CopyTo (ar, 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
[MonoInternalNote ("our enumerator is slightly different. in MS's implementation the Values are WeakReferences to the managers.")]
IEnumerator IEnumerable.GetEnumerator() {
return managers.GetEnumerator ();
}
#endregion // IEnumerable Interfaces
}
}
|