387 lines
9.4 KiB
C#
387 lines
9.4 KiB
C#
// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// Copyright (c) 2007 Novell, Inc.
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//
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Reflection;
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namespace System.ComponentModel {
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[SerializableAttribute]
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public class BindingList<T> : Collection<T>,
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IBindingList, IList, ICollection,
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IEnumerable, ICancelAddNew, IRaiseItemChangedEvents
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{
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bool allow_edit = true;
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bool allow_remove = true;
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bool allow_new;
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bool allow_new_set;
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bool raise_list_changed_events = true;
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bool type_has_default_ctor;
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bool type_raises_item_changed_events;
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bool add_pending;
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int pending_add_index;
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void CheckType ()
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{
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ConstructorInfo ci = typeof (T).GetConstructor (Type.EmptyTypes);
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type_has_default_ctor = (ci != null);
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type_raises_item_changed_events = typeof (INotifyPropertyChanged).IsAssignableFrom (typeof (T));
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}
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public BindingList (IList<T> list) : base(list)
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{
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CheckType ();
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}
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public BindingList () : base ()
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{
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CheckType ();
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}
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public bool AllowEdit {
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get { return allow_edit; }
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set {
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if (allow_edit != value) {
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allow_edit = value;
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if (raise_list_changed_events)
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OnListChanged (new ListChangedEventArgs (ListChangedType.Reset, -1 /* XXX */));
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}
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}
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}
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public bool AllowNew {
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get {
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/* if the user explicitly it, return that value */
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if (allow_new_set)
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return allow_new;
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/* if the list type has a default constructor we allow new */
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if (type_has_default_ctor)
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return true;
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/* if the user adds a delegate, we return true even if
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the type doesn't have a default ctor */
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if (AddingNew != null)
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return true;
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return false;
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}
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set {
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// this funky check (using AllowNew
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// instead of allow_new allows us to
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// keep the logic for the 3 cases in
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// one place (the getter) instead of
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// spreading them around the file (in
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// the ctor, in the AddingNew add
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// handler, etc.
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if (AllowNew != value) {
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allow_new_set = true;
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allow_new = value;
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if (raise_list_changed_events)
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OnListChanged (new ListChangedEventArgs (ListChangedType.Reset, -1 /* XXX */));
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}
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}
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}
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public bool AllowRemove {
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get { return allow_remove; }
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set {
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if (allow_remove != value) {
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allow_remove = value;
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if (raise_list_changed_events)
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OnListChanged (new ListChangedEventArgs (ListChangedType.Reset, -1 /* XXX */));
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}
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}
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}
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protected virtual bool IsSortedCore {
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get { return false; }
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}
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public bool RaiseListChangedEvents {
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get { return raise_list_changed_events; }
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set { raise_list_changed_events = value; }
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}
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protected virtual ListSortDirection SortDirectionCore {
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get { return ListSortDirection.Ascending; }
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}
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protected virtual PropertyDescriptor SortPropertyCore {
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get { return null; }
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}
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protected virtual bool SupportsChangeNotificationCore {
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get { return true; }
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}
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protected virtual bool SupportsSearchingCore {
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get { return false; }
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}
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protected virtual bool SupportsSortingCore {
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get { return false; }
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}
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public event AddingNewEventHandler AddingNew;
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public event ListChangedEventHandler ListChanged;
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public T AddNew ()
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{
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return (T)AddNewCore ();
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}
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protected virtual object AddNewCore ()
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{
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if (!AllowNew)
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throw new InvalidOperationException ();
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AddingNewEventArgs args = new AddingNewEventArgs ();
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OnAddingNew (args);
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T new_obj = (T)args.NewObject;
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if (new_obj == null) {
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if (!type_has_default_ctor)
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throw new InvalidOperationException ();
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new_obj = (T)Activator.CreateInstance (typeof (T));
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}
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Add (new_obj);
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pending_add_index = IndexOf (new_obj);
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add_pending = true;
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return new_obj;
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}
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protected virtual void ApplySortCore (PropertyDescriptor prop, ListSortDirection direction)
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{
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throw new NotSupportedException ();
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}
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public virtual void CancelNew (int itemIndex)
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{
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if (!add_pending)
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return;
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if (itemIndex != pending_add_index)
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return;
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add_pending = false;
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base.RemoveItem (itemIndex);
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if (raise_list_changed_events)
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OnListChanged (new ListChangedEventArgs (ListChangedType.ItemDeleted, itemIndex));
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}
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protected override void ClearItems ()
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{
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EndNew (pending_add_index);
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if (type_raises_item_changed_events) {
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foreach ( T item in base.Items ) {
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(item as INotifyPropertyChanged).PropertyChanged -= Item_PropertyChanged;
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}
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}
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base.ClearItems ();
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OnListChanged (new ListChangedEventArgs (ListChangedType.Reset, -1));
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}
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public virtual void EndNew (int itemIndex)
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{
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if (!add_pending)
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return;
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if (itemIndex != pending_add_index)
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return;
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add_pending = false;
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}
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protected virtual int FindCore (PropertyDescriptor prop, object key)
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{
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throw new NotSupportedException ();
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}
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protected override void InsertItem (int index, T item)
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{
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EndNew (pending_add_index);
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base.InsertItem (index, item);
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if (raise_list_changed_events)
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OnListChanged (new ListChangedEventArgs (ListChangedType.ItemAdded, index));
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if (item != null && type_raises_item_changed_events)
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(item as INotifyPropertyChanged).PropertyChanged += Item_PropertyChanged;
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}
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void Item_PropertyChanged (object item, PropertyChangedEventArgs args)
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{
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var property_info = item.GetType ().GetProperty (args.PropertyName);
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if (property_info != null) {
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OnListChanged (new ListChangedEventArgs (ListChangedType.ItemChanged, base.IndexOf ((T) item),
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new ReflectionPropertyDescriptor (property_info)) );
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} else {
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OnListChanged (new ListChangedEventArgs (ListChangedType.ItemChanged, base.IndexOf ((T) item)) );
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}
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}
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protected virtual void OnAddingNew (AddingNewEventArgs e)
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{
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if (AddingNew != null)
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AddingNew (this, e);
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}
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protected virtual void OnListChanged (ListChangedEventArgs e)
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{
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if (ListChanged != null)
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ListChanged (this, e);
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}
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protected override void RemoveItem (int index)
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{
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if (!AllowRemove)
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throw new NotSupportedException ();
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EndNew (pending_add_index);
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if (type_raises_item_changed_events) {
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(base[index] as INotifyPropertyChanged).PropertyChanged -= Item_PropertyChanged;
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}
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base.RemoveItem (index);
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if (raise_list_changed_events)
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OnListChanged (new ListChangedEventArgs (ListChangedType.ItemDeleted, index));
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}
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protected virtual void RemoveSortCore ()
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{
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throw new NotSupportedException ();
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}
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public void ResetBindings ()
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{
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OnListChanged (new ListChangedEventArgs (ListChangedType.Reset, -1));
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}
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public void ResetItem (int position)
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{
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OnListChanged (new ListChangedEventArgs (ListChangedType.ItemChanged, position));
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}
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protected override void SetItem (int index, T item)
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{
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if (type_raises_item_changed_events) {
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(base[index] as INotifyPropertyChanged).PropertyChanged -= Item_PropertyChanged;
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(item as INotifyPropertyChanged).PropertyChanged += Item_PropertyChanged;
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}
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base.SetItem (index, item);
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OnListChanged (new ListChangedEventArgs (ListChangedType.ItemChanged, index));
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}
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void IBindingList.AddIndex (PropertyDescriptor index)
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{
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/* no implementation by default */
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}
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object IBindingList.AddNew ()
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{
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return AddNew ();
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}
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void IBindingList.ApplySort (PropertyDescriptor property, ListSortDirection direction)
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{
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ApplySortCore (property, direction);
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}
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int IBindingList.Find (PropertyDescriptor property, object key)
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{
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return FindCore (property, key);
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}
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void IBindingList.RemoveIndex (PropertyDescriptor property)
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{
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/* no implementation by default */
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}
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void IBindingList.RemoveSort ()
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{
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RemoveSortCore ();
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}
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bool IBindingList.IsSorted {
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get { return IsSortedCore; }
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}
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ListSortDirection IBindingList.SortDirection {
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get { return SortDirectionCore; }
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}
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PropertyDescriptor IBindingList.SortProperty {
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get { return SortPropertyCore; }
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}
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bool IBindingList.AllowEdit {
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get { return AllowEdit; }
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}
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bool IBindingList.AllowNew {
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get { return AllowNew; }
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}
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bool IBindingList.AllowRemove {
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get { return AllowRemove; }
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}
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bool IBindingList.SupportsChangeNotification {
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get { return SupportsChangeNotificationCore; }
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}
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bool IBindingList.SupportsSearching {
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get { return SupportsSearchingCore; }
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}
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bool IBindingList.SupportsSorting {
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get { return SupportsSortingCore; }
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}
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bool IRaiseItemChangedEvents.RaisesItemChangedEvents {
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get { return type_raises_item_changed_events; }
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}
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}
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}
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