1 files changed, 453 insertions, 0 deletions
diff --git a/source/ShiftUI/Internal/CurrencyManager.cs b/source/ShiftUI/Internal/CurrencyManager.cs
new file mode 100644
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+++ b/source/ShiftUI/Internal/CurrencyManager.cs
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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) 2005 Novell, Inc.
+//
+// Authors:
+//	Jackson Harper ([email protected])
+// 	Ivan N. Zlatev ([email protected])
+//
+
+using System;
+using System.Data;
+using System.Reflection;
+using System.Collections;
+using System.ComponentModel;
+
+namespace ShiftUI {
+	public class CurrencyManager : BindingManagerBase {
+
+		protected int listposition;
+		protected Type finalType;
+
+		private IList list;
+		private bool binding_suspended;
+
+		private object data_source;
+
+		bool editing;
+
+		internal CurrencyManager ()
+		{
+		}
+
+		internal CurrencyManager (object data_source)
+		{
+			SetDataSource (data_source);
+		}
+
+		public IList List {
+			get { return list; }
+		}
+
+		public override object Current {
+			get {
+				if (listposition == -1 || listposition >= list.Count) {
+					// Console.WriteLine ("throwing exception from here");
+					// Console.WriteLine (Environment.StackTrace);
+					throw new IndexOutOfRangeException ("list position");
+				}
+				return list [listposition];
+			}
+		}
+
+		public override int Count {
+			get { return list.Count; }
+		}
+
+		public override int Position {
+			get {
+				return listposition;
+			} 
+			set {
+				if (value < 0)
+					value = 0;
+				if (value >= list.Count)
+					value = list.Count - 1;
+				if (listposition == value)
+					return;
+
+				if (listposition != -1)
+					EndCurrentEdit ();
+
+				listposition = value;
+				OnCurrentChanged (EventArgs.Empty);
+				OnPositionChanged (EventArgs.Empty);
+			}
+		}
+
+		internal void SetDataSource (object data_source)
+		{
+			if (this.data_source is IBindingList)
+				((IBindingList)this.data_source).ListChanged -= new ListChangedEventHandler (ListChangedHandler);
+
+			if (data_source is IListSource)
+				data_source = ((IListSource)data_source).GetList();
+
+			this.data_source = data_source;
+			if (data_source != null)
+				this.finalType = data_source.GetType();
+
+			listposition = -1;
+			if (this.data_source is IBindingList)
+				((IBindingList)this.data_source).ListChanged += new ListChangedEventHandler (ListChangedHandler);
+
+			list = (IList)data_source;
+
+			// XXX this is wrong.  MS invokes OnItemChanged directly, which seems to call PushData.
+			ListChangedHandler (null, new ListChangedEventArgs (ListChangedType.Reset, -1));
+		}
+
+		public override PropertyDescriptorCollection GetItemProperties ()
+		{
+			return ListBindingHelper.GetListItemProperties (list);
+		}
+
+		public override void RemoveAt (int index)
+		{
+			list.RemoveAt (index);
+		}
+
+		public override void SuspendBinding ()
+		{
+			binding_suspended = true;
+		}
+		
+		public override void ResumeBinding ()
+		{
+			binding_suspended = false;
+		}
+
+                internal override bool IsSuspended {
+                        get {
+				// Always return true if we don't have items
+				if (Count == 0)
+					return true;
+
+				return binding_suspended;
+			}
+                }
+
+                internal bool AllowNew {
+                	get {
+				if (list is IBindingList)
+					return ((IBindingList)list).AllowNew;
+
+				if (list.IsReadOnly)
+					return false;
+
+				return false;
+			}
+		}
+
+		internal bool AllowRemove {
+			get {
+				if (list.IsReadOnly)
+					return false;
+
+				if (list is IBindingList)
+					return ((IBindingList)list).AllowRemove;
+
+				return false;
+			}
+		}
+
+		internal bool AllowEdit {
+			get {
+				if (list is IBindingList)
+					return ((IBindingList)list).AllowEdit;
+
+				return false;
+			}
+		}
+
+		public override void AddNew ()
+		{
+			IBindingList ibl = list as IBindingList;
+
+			if (ibl == null)
+				throw new NotSupportedException ();
+
+			ibl.AddNew ();
+
+			bool validate = (Position != (list.Count - 1));
+			ChangeRecordState (list.Count - 1, validate, validate, true, true);
+		}
+
+
+		void BeginEdit ()
+		{
+			IEditableObject editable = Current as IEditableObject;
+
+			if (editable != null) {
+				try {
+					editable.BeginEdit ();
+					editing = true;
+				}
+				catch {
+					/* swallow exceptions in IEditableObject.BeginEdit () */
+				}
+			}
+		}
+
+		public override void CancelCurrentEdit ()
+		{
+			if (listposition == -1)
+				return;
+
+			IEditableObject editable = Current as IEditableObject;
+
+			if (editable != null) {
+				editing = false;
+				editable.CancelEdit ();
+				OnItemChanged (new ItemChangedEventArgs (Position));
+			}
+			if (list is ICancelAddNew)
+				((ICancelAddNew)list).CancelNew (listposition);
+		}
+		
+		public override void EndCurrentEdit ()
+		{
+			if (listposition == -1)
+				return;
+
+			IEditableObject editable = Current as IEditableObject;
+
+			if (editable != null) {
+				editing = false;
+				editable.EndEdit ();
+			}
+
+			if (list is ICancelAddNew)
+				((ICancelAddNew)list).EndNew (listposition);
+		}
+
+		public void Refresh ()
+		{
+			ListChangedHandler (null, new ListChangedEventArgs (ListChangedType.Reset, -1));
+		}
+
+		protected void CheckEmpty ()
+		{
+			if (list == null || list.Count < 1)
+				throw new Exception ("List is empty.");
+				
+		}
+
+		protected internal override void OnCurrentChanged (EventArgs e)
+		{
+			if (onCurrentChangedHandler != null) {
+				onCurrentChangedHandler (this, e);
+			}
+
+			// don't call OnCurrentItemChanged here, as it can be overridden
+			if (onCurrentItemChangedHandler != null) {
+				onCurrentItemChangedHandler (this, e);
+			}
+
+		}
+
+		protected override void OnCurrentItemChanged (EventArgs e)
+		{
+			if (onCurrentItemChangedHandler != null) {
+				onCurrentItemChangedHandler (this, e);
+			}
+		}
+
+		protected virtual void OnItemChanged (ItemChangedEventArgs e)
+		{
+			if (ItemChanged != null)
+				ItemChanged (this, e);
+
+			transfering_data = true;
+			PushData ();
+			transfering_data = false;
+		}
+
+		void OnListChanged (ListChangedEventArgs args)
+		{
+			if (ListChanged != null)
+				ListChanged (this, args);
+		}
+
+		protected virtual void OnPositionChanged (EventArgs e)
+		{
+			if (onPositionChangedHandler != null)
+				onPositionChangedHandler (this, e);
+		}
+
+		protected internal override string GetListName (ArrayList listAccessors)
+		{
+			if (list is ITypedList) {
+				PropertyDescriptor [] pds = null;
+				if (listAccessors != null) {
+					pds = new PropertyDescriptor [listAccessors.Count];
+					listAccessors.CopyTo (pds, 0);
+				}
+				return ((ITypedList) list).GetListName (pds);
+			}
+			else if (finalType != null) {
+				return finalType.Name;
+			}
+			return String.Empty;
+		}
+
+		protected override void UpdateIsBinding ()
+		{
+			UpdateItem ();
+
+			foreach (Binding binding in Bindings)
+				binding.UpdateIsBinding ();
+
+			ChangeRecordState (listposition, false, false, true, false);
+
+			OnItemChanged (new ItemChangedEventArgs (-1));
+		}
+
+		private void ChangeRecordState (int newPosition,
+						bool validating,
+						bool endCurrentEdit,
+						bool firePositionChanged,
+						bool pullData)
+		{
+			if (endCurrentEdit)
+				EndCurrentEdit ();
+
+			int old_index = listposition;
+
+			listposition = newPosition;
+
+			if (listposition >= list.Count)
+				listposition = list.Count - 1;
+
+			if (old_index != -1 && listposition != -1)
+				OnCurrentChanged (EventArgs.Empty);
+
+			if (firePositionChanged)
+				OnPositionChanged (EventArgs.Empty);
+		}
+
+		private void UpdateItem ()
+		{
+			// Probably should be validating or something here
+			if (!transfering_data && listposition == -1 && list.Count > 0) {
+				listposition = 0;
+				BeginEdit ();
+			}
+		}
+		
+		internal object this [int index] {
+			get { return list [index]; }
+		}		
+		
+		private PropertyDescriptorCollection GetBrowsableProperties (Type t)
+		{
+			Attribute [] att = new System.Attribute [1];
+			att [0] = new BrowsableAttribute (true);
+			return TypeDescriptor.GetProperties (t, att);
+		}
+
+		protected void OnMetaDataChanged (EventArgs e)
+		{
+			if (MetaDataChanged != null)
+				MetaDataChanged (this, e);
+		}
+
+		private void ListChangedHandler (object sender, ListChangedEventArgs e)
+		{
+			switch (e.ListChangedType) {
+			case ListChangedType.PropertyDescriptorAdded:
+			case ListChangedType.PropertyDescriptorDeleted:
+			case ListChangedType.PropertyDescriptorChanged:
+				OnMetaDataChanged (EventArgs.Empty);
+				OnListChanged (e);
+				break;
+			case ListChangedType.ItemDeleted:
+				if (list.Count == 0) {
+					/* the last row was deleted */
+					listposition = -1;
+					UpdateIsBinding ();
+
+					OnPositionChanged (EventArgs.Empty);
+					OnCurrentChanged (EventArgs.Empty);
+				}
+				else if (e.NewIndex <= listposition) {
+					/* the deleted row was either the current one, or one earlier in the list.
+					   Update the index and emit PositionChanged, CurrentChanged, and ItemChanged. */
+					// FIXME: this looks wrong, shouldn't it be (listposition - 1) instead of e.NewIndex ?
+					ChangeRecordState (e.NewIndex,
+							   false, false, e.NewIndex != listposition, false);
+				}
+				else {
+					/* the deleted row was after the current one, so we don't
+					   need to update bound Widgets for Position/Current changed */
+				}
+
+				OnItemChanged (new ItemChangedEventArgs (-1));
+				OnListChanged (e);
+				break;
+			case ListChangedType.ItemAdded:
+				if (list.Count == 1) {
+					/* it's the first one we've added */
+					ChangeRecordState (e.NewIndex,
+							   false, false, true, false);
+
+					OnItemChanged (new ItemChangedEventArgs (-1));
+					OnListChanged (e);
+				}
+				else {
+					if (e.NewIndex <= listposition) {
+						ChangeRecordState (listposition + 1,
+								   false, false, false, false);
+						OnItemChanged (new ItemChangedEventArgs (-1));
+						OnListChanged (e);
+						OnPositionChanged (EventArgs.Empty);
+					}
+					else {
+						OnItemChanged (new ItemChangedEventArgs (-1));
+						OnListChanged (e);
+					}
+				}
+
+				break;
+			case ListChangedType.ItemChanged:
+				if (editing) {
+					if (e.NewIndex == listposition)
+						OnCurrentItemChanged (EventArgs.Empty);
+					OnItemChanged (new ItemChangedEventArgs (e.NewIndex));
+				}
+				OnListChanged (e);
+				break;
+			case ListChangedType.Reset:
+				PushData();
+				UpdateIsBinding();
+				OnListChanged (e);
+				break;
+			default:
+				OnListChanged (e);
+				break;
+			}
+		}
+
+		public event ListChangedEventHandler ListChanged;
+		public event ItemChangedEventHandler ItemChanged;
+		public event EventHandler MetaDataChanged;
+	}
+}
+