Commit for development environment setup

PROMS/csla20cs-2.1.4-070223/csla20cs/OLDcsla20cs/Csla/Windows/BindingSourceRefresh.cs

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+using System;
+using System.ComponentModel;
+using System.Collections.Generic;
+using System.Windows.Forms;
+
+// code from Bill McCarthy
+// http://msmvps.com/bill/archive/2005/10/05/69012.aspx
+// used with permission
+
+namespace Csla.Windows
+{
+  /// <summary>
+  /// Windows Forms extender control that resolves the
+  /// data refresh issue with data bound detail controls
+  /// as discussed in Chapter 5.
+  /// </summary>
+  [DesignerCategory("")]
+  [ProvideProperty("ReadValuesOnChange", typeof(BindingSource))]
+  public class BindingSourceRefresh : Component, IExtenderProvider
+  {
+
+    private Dictionary<BindingSource, bool> _sources = new Dictionary<BindingSource, bool>();
+
+    /// <summary>
+    /// Creates an instance of the object.
+    /// </summary>
+    /// <param name="container">Container of the control.</param>
+    public BindingSourceRefresh(IContainer container)
+    {
+      container.Add(this);
+    }
+
+    /// <summary>
+    /// Gets a value indicating whether the extender control
+    /// can extend the specified control.
+    /// </summary>
+    /// <param name="extendee">The control to be extended.</param>
+    /// <remarks>
+    /// This control only extends <see cref="BindingSource"/> controls.
+    /// </remarks>
+    public bool CanExtend(object extendee)
+    {
+      if (extendee is BindingSource)
+        return true;
+      return false;
+    }
+
+    /// <summary>
+    /// Gets the value of the custom ReadValuesOnChange extender
+    /// property added to extended controls.
+    /// </summary>
+    /// <param name="source">Control being extended.</param>
+    public bool GetReadValuesOnChange(BindingSource source)
+    {
+      if (_sources.ContainsKey(source))
+        return _sources[source];
+      return false;
+    }
+
+    /// <summary>
+    /// Sets the value of the custom ReadValuesOnChange extender
+    /// property added to extended controls.
+    /// </summary>
+    /// <param name="source">Control being extended.</param>
+    /// <param name="value">New value of property.</param>
+    /// <remarks></remarks>
+    public void SetReadValuesOnChange(
+      BindingSource source, bool value)
+    {
+      if (_sources.ContainsKey(source))
+        _sources[source] = value;
+      else
+        _sources.Add(source, value);
+      if (value)
+      {
+        // hook
+        source.BindingComplete += 
+          new BindingCompleteEventHandler(Source_BindingComplete);
+      }
+      else
+      {
+        // unhook
+        source.BindingComplete -= 
+          new BindingCompleteEventHandler(Source_BindingComplete);
+      }
+    }
+
+    private void Source_BindingComplete(
+      object sender, BindingCompleteEventArgs e)
+    {
+      e.Binding.ReadValue();
+    }
+
+  }
+}