mcs/class/Managed.Windows.Forms/System.Windows.Forms/RelatedPropertyManager.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2006 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Chris Toshok    <toshok@ximian.com>
  24
  25 using System;
  26 using System.Collections;
  27 using System.ComponentModel;
  28
  29 namespace System.Windows.Forms {
  30
  31         internal class RelatedPropertyManager : PropertyManager {
  32
  33                 BindingManagerBase parent;
  34
  35                 public RelatedPropertyManager (BindingManagerBase parent, string property_name)
  36                 {
  37                         this.parent = parent;
  38                         this.property_name = property_name;
  39
  40                         if (parent.Position != -1)
  41                                 SetDataSource (parent.Current);
  42                         parent.PositionChanged += new EventHandler (parent_PositionChanged);
  43                 }
  44
  45                 void parent_PositionChanged (object sender, EventArgs args)
  46                 {
  47                         if (parent.Position == -1) {
  48                                 SetDataSource (null);
  49                         }
  50                         else {
  51                                 SetDataSource (parent.Current);
  52                         }
  53
  54                         OnCurrentChanged (EventArgs.Empty);
  55                 }
  56         }
  57 }
  58