454 lines
11 KiB
C#
454 lines
11 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) 2005 Novell, Inc.
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//
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// Authors:
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// Jackson Harper (jackson@ximian.com)
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// Ivan N. Zlatev (contact@i-nz.net)
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//
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using System;
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using System.Data;
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using System.Reflection;
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using System.Collections;
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using System.ComponentModel;
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namespace System.Windows.Forms {
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public class CurrencyManager : BindingManagerBase {
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protected int listposition;
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protected Type finalType;
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private IList list;
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private bool binding_suspended;
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private object data_source;
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bool editing;
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internal CurrencyManager ()
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{
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}
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internal CurrencyManager (object data_source)
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{
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SetDataSource (data_source);
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}
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public IList List {
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get { return list; }
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}
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public override object Current {
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get {
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if (listposition == -1 || listposition >= list.Count) {
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// Console.WriteLine ("throwing exception from here");
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// Console.WriteLine (Environment.StackTrace);
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throw new IndexOutOfRangeException ("list position");
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}
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return list [listposition];
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}
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}
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public override int Count {
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get { return list.Count; }
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}
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public override int Position {
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get {
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return listposition;
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}
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set {
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if (value < 0)
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value = 0;
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if (value >= list.Count)
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value = list.Count - 1;
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if (listposition == value)
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return;
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if (listposition != -1)
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EndCurrentEdit ();
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listposition = value;
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OnCurrentChanged (EventArgs.Empty);
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OnPositionChanged (EventArgs.Empty);
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}
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}
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internal void SetDataSource (object data_source)
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{
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if (this.data_source is IBindingList)
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((IBindingList)this.data_source).ListChanged -= new ListChangedEventHandler (ListChangedHandler);
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if (data_source is IListSource)
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data_source = ((IListSource)data_source).GetList();
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this.data_source = data_source;
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if (data_source != null)
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this.finalType = data_source.GetType();
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listposition = -1;
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if (this.data_source is IBindingList)
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((IBindingList)this.data_source).ListChanged += new ListChangedEventHandler (ListChangedHandler);
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list = (IList)data_source;
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// XXX this is wrong. MS invokes OnItemChanged directly, which seems to call PushData.
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ListChangedHandler (null, new ListChangedEventArgs (ListChangedType.Reset, -1));
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}
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public override PropertyDescriptorCollection GetItemProperties ()
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{
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return ListBindingHelper.GetListItemProperties (list);
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}
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public override void RemoveAt (int index)
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{
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list.RemoveAt (index);
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}
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public override void SuspendBinding ()
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{
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binding_suspended = true;
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}
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public override void ResumeBinding ()
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{
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binding_suspended = false;
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}
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internal override bool IsSuspended {
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get {
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// Always return true if we don't have items
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if (Count == 0)
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return true;
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return binding_suspended;
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}
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}
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internal bool AllowNew {
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get {
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if (list is IBindingList)
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return ((IBindingList)list).AllowNew;
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if (list.IsReadOnly)
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return false;
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return false;
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}
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}
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internal bool AllowRemove {
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get {
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if (list.IsReadOnly)
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return false;
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if (list is IBindingList)
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return ((IBindingList)list).AllowRemove;
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return false;
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}
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}
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internal bool AllowEdit {
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get {
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if (list is IBindingList)
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return ((IBindingList)list).AllowEdit;
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return false;
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}
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}
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public override void AddNew ()
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{
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IBindingList ibl = list as IBindingList;
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if (ibl == null)
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throw new NotSupportedException ();
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ibl.AddNew ();
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bool validate = (Position != (list.Count - 1));
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ChangeRecordState (list.Count - 1, validate, validate, true, true);
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}
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void BeginEdit ()
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{
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IEditableObject editable = Current as IEditableObject;
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if (editable != null) {
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try {
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editable.BeginEdit ();
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editing = true;
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}
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catch {
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/* swallow exceptions in IEditableObject.BeginEdit () */
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}
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}
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}
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public override void CancelCurrentEdit ()
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{
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if (listposition == -1)
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return;
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IEditableObject editable = Current as IEditableObject;
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if (editable != null) {
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editing = false;
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editable.CancelEdit ();
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OnItemChanged (new ItemChangedEventArgs (Position));
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}
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if (list is ICancelAddNew)
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((ICancelAddNew)list).CancelNew (listposition);
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}
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public override void EndCurrentEdit ()
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{
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if (listposition == -1)
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return;
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IEditableObject editable = Current as IEditableObject;
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if (editable != null) {
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editing = false;
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editable.EndEdit ();
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}
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if (list is ICancelAddNew)
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((ICancelAddNew)list).EndNew (listposition);
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}
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public void Refresh ()
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{
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ListChangedHandler (null, new ListChangedEventArgs (ListChangedType.Reset, -1));
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}
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protected void CheckEmpty ()
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{
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if (list == null || list.Count < 1)
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throw new Exception ("List is empty.");
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}
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protected internal override void OnCurrentChanged (EventArgs e)
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{
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if (onCurrentChangedHandler != null) {
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onCurrentChangedHandler (this, e);
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}
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// don't call OnCurrentItemChanged here, as it can be overridden
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if (onCurrentItemChangedHandler != null) {
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onCurrentItemChangedHandler (this, e);
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}
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}
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protected override void OnCurrentItemChanged (EventArgs e)
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{
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if (onCurrentItemChangedHandler != null) {
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onCurrentItemChangedHandler (this, e);
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}
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}
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protected virtual void OnItemChanged (ItemChangedEventArgs e)
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{
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if (ItemChanged != null)
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ItemChanged (this, e);
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transfering_data = true;
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PushData ();
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transfering_data = false;
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}
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void OnListChanged (ListChangedEventArgs args)
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{
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if (ListChanged != null)
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ListChanged (this, args);
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}
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protected virtual void OnPositionChanged (EventArgs e)
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{
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if (onPositionChangedHandler != null)
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onPositionChangedHandler (this, e);
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}
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protected internal override string GetListName (ArrayList listAccessors)
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{
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if (list is ITypedList) {
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PropertyDescriptor [] pds = null;
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if (listAccessors != null) {
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pds = new PropertyDescriptor [listAccessors.Count];
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listAccessors.CopyTo (pds, 0);
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}
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return ((ITypedList) list).GetListName (pds);
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}
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else if (finalType != null) {
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return finalType.Name;
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}
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return String.Empty;
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}
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protected override void UpdateIsBinding ()
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{
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UpdateItem ();
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foreach (Binding binding in Bindings)
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binding.UpdateIsBinding ();
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ChangeRecordState (listposition, false, false, true, false);
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OnItemChanged (new ItemChangedEventArgs (-1));
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}
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private void ChangeRecordState (int newPosition,
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bool validating,
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bool endCurrentEdit,
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bool firePositionChanged,
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bool pullData)
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{
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if (endCurrentEdit)
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EndCurrentEdit ();
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int old_index = listposition;
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listposition = newPosition;
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if (listposition >= list.Count)
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listposition = list.Count - 1;
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if (old_index != -1 && listposition != -1)
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OnCurrentChanged (EventArgs.Empty);
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if (firePositionChanged)
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OnPositionChanged (EventArgs.Empty);
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}
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private void UpdateItem ()
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{
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// Probably should be validating or something here
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if (!transfering_data && listposition == -1 && list.Count > 0) {
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listposition = 0;
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BeginEdit ();
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}
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}
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internal object this [int index] {
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get { return list [index]; }
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}
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private PropertyDescriptorCollection GetBrowsableProperties (Type t)
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{
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Attribute [] att = new System.Attribute [1];
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att [0] = new BrowsableAttribute (true);
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return TypeDescriptor.GetProperties (t, att);
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}
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protected void OnMetaDataChanged (EventArgs e)
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{
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if (MetaDataChanged != null)
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MetaDataChanged (this, e);
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}
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private void ListChangedHandler (object sender, ListChangedEventArgs e)
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{
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switch (e.ListChangedType) {
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case ListChangedType.PropertyDescriptorAdded:
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case ListChangedType.PropertyDescriptorDeleted:
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case ListChangedType.PropertyDescriptorChanged:
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OnMetaDataChanged (EventArgs.Empty);
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OnListChanged (e);
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break;
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case ListChangedType.ItemDeleted:
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if (list.Count == 0) {
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/* the last row was deleted */
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listposition = -1;
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UpdateIsBinding ();
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OnPositionChanged (EventArgs.Empty);
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OnCurrentChanged (EventArgs.Empty);
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}
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else if (e.NewIndex <= listposition) {
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/* the deleted row was either the current one, or one earlier in the list.
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Update the index and emit PositionChanged, CurrentChanged, and ItemChanged. */
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// FIXME: this looks wrong, shouldn't it be (listposition - 1) instead of e.NewIndex ?
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ChangeRecordState (e.NewIndex,
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false, false, e.NewIndex != listposition, false);
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}
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else {
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/* the deleted row was after the current one, so we don't
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need to update bound controls for Position/Current changed */
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}
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OnItemChanged (new ItemChangedEventArgs (-1));
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OnListChanged (e);
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break;
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case ListChangedType.ItemAdded:
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if (list.Count == 1) {
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/* it's the first one we've added */
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ChangeRecordState (e.NewIndex,
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false, false, true, false);
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OnItemChanged (new ItemChangedEventArgs (-1));
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OnListChanged (e);
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}
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else {
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if (e.NewIndex <= listposition) {
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ChangeRecordState (listposition + 1,
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false, false, false, false);
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OnItemChanged (new ItemChangedEventArgs (-1));
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OnListChanged (e);
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OnPositionChanged (EventArgs.Empty);
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}
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else {
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OnItemChanged (new ItemChangedEventArgs (-1));
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OnListChanged (e);
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}
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}
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break;
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case ListChangedType.ItemChanged:
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if (editing) {
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if (e.NewIndex == listposition)
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OnCurrentItemChanged (EventArgs.Empty);
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OnItemChanged (new ItemChangedEventArgs (e.NewIndex));
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}
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OnListChanged (e);
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break;
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case ListChangedType.Reset:
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PushData();
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UpdateIsBinding();
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OnListChanged (e);
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break;
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default:
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OnListChanged (e);
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break;
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}
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}
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public event ListChangedEventHandler ListChanged;
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public event ItemChangedEventHandler ItemChanged;
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public event EventHandler MetaDataChanged;
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}
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}
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