[Mwinapi-commits] SF.net SVN: mwinapi:[139] trunk/ManagedWinapi/Accessibility/ SystemAccessibleObject.cs

[<zi...@us...>]

Revision: 139
          http://sourceforge.net/p/mwinapi/code/139
Author:   ziewer
Date:     2016-01-25 19:56:53 +0000 (Mon, 25 Jan 2016)
Log Message:
-----------
Added "GetChild(int index)" to request a specific child instead of requesting all children

Boosts performance when only a specific child is required but sao has many children (e.g. in Internet Explorer)

Modified Paths:
--------------
    trunk/ManagedWinapi/Accessibility/SystemAccessibleObject.cs

Modified: trunk/ManagedWinapi/Accessibility/SystemAccessibleObject.cs
===================================================================
--- trunk/ManagedWinapi/Accessibility/SystemAccessibleObject.cs	2016-01-25 19:53:53 UTC (rev 138)
+++ trunk/ManagedWinapi/Accessibility/SystemAccessibleObject.cs	2016-01-25 19:56:53 UTC (rev 139)
@@ -538,6 +538,34 @@
         }
 
         /// <summary>
+        /// Get specific child of accessible object.
+        /// </summary>
+        public SystemAccessibleObject GetChild(int index)
+        {
+            // ID-referenced objects cannot have children
+            if (childID != 0) return null;
+
+            int cs = iacc.accChildCount, csReal;
+            object[] children = new object[1];
+
+            uint result = AccessibleChildren(iacc, index, 1, children, out csReal);
+            if (result != 0 && result != 1)
+                return null;
+            if (csReal == 1 && children[0] is int && (int)children[0] < 0)
+                return null;
+            List<SystemAccessibleObject> values = new List<SystemAccessibleObject>();
+            if (children[0] != null)
+            {
+                try
+                {
+                    return ObjectToSAO(children[0]);
+                }
+                catch (InvalidCastException) { }
+            }
+            return null;
+        }
+
+        /// <summary>
         /// Highlight the accessible object with a red border.
         /// </summary>
         public void Highlight()

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