mcs/class/System.Design/System.Windows.Forms.Design.Behavior/BehaviorServiceAdornerCollectionEnumerator.cs

   1 //
   2 // System.Windows.Forms.Design.Behavior.BehaviorServiceAdornerCollectionEnumerator
   3 //
   4 // Author:
   5 //      Atsushi Enomoto (atsushi@ximian.com)
   6 //
   7 // Copyright (C) 2007 Novell, Inc.
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31
  32 using System.Collections;
  33
  34 namespace System.Windows.Forms.Design.Behavior
  35 {
  36         public class BehaviorServiceAdornerCollectionEnumerator : IEnumerator
  37         {
  38                 BehaviorServiceAdornerCollection mappings;
  39                 int index, state;
  40
  41                 public BehaviorServiceAdornerCollectionEnumerator (BehaviorServiceAdornerCollection mappings)
  42                 {
  43                         if (mappings == null)
  44                                 throw new ArgumentNullException ("mappings");
  45                         this.mappings = mappings;
  46
  47                         Reset ();
  48                 }
  49
  50                 public Adorner Current {
  51                         get { return index < 0 ? null : mappings [index]; }
  52                 }
  53
  54                 void CheckState ()
  55                 {
  56                         if (mappings.State != state)
  57                                 throw new InvalidOperationException ("Collection has changed");
  58                 }
  59
  60                 public bool MoveNext ()
  61                 {
  62                         CheckState ();
  63                         if (index++ < mappings.Count)
  64                                 return true;
  65                         index--;
  66                         return false;
  67                 }
  68
  69                 public void Reset ()
  70                 {
  71                         index = -1;
  72                 }
  73
  74                 object IEnumerator.Current {
  75                         get { return Current; }
  76                 }
  77
  78                 bool IEnumerator.MoveNext ()
  79                 {
  80                         return MoveNext ();
  81                 }
  82
  83                 void IEnumerator.Reset ()
  84                 {
  85                         Reset ();
  86                 }
  87         }
  88 }
  89