Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/ControlIdConverter.cs

@@ -0,0 +1,108 @@
+//------------------------------------------------------------------------------
+// <copyright file="ControlIDConverter.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI.WebControls {
+
+    using System.Collections;
+    using System.ComponentModel;
+    using System.ComponentModel.Design;
+    using System.Globalization;
+    using System.Reflection;
+    using System.Web.Util;
+    using System.Security.Permissions;
+
+
+    /// <devdoc>
+    /// TypeConverter for ControlParameter's ControlID property.
+    /// </devdoc>
+    public class ControlIDConverter : StringConverter {
+
+
+        /// <devdoc>
+        ///    <para>Determines whether a given control should have its id added to the StandardValuesCollection.</para>
+        /// </devdoc>
+        protected virtual bool FilterControl(Control control) {
+            return true;
+        }
+
+        /// <devdoc>
+        /// Returns a list of all control IDs in the container.
+        /// </devdoc>
+        private string[] GetControls(IDesignerHost host, object instance) {
+            IContainer container = host.Container;
+
+            // Locate nearest container
+            IComponent component = instance as IComponent;
+            if (component != null && component.Site != null) {
+                container = component.Site.Container;
+            }
+
+            if (container == null) {
+                return null;
+            }
+            ComponentCollection allComponents = container.Components;
+            ArrayList array = new ArrayList();
+
+            // For each control in the container
+            foreach (IComponent comp in (IEnumerable)allComponents) {
+                Control control = comp as Control;
+                // Ignore DesignerHost.RootComponent (Page or UserControl), controls that don't have ID's, 
+                // and the Control itself
+                if (control != null &&
+                    control != instance && 
+                    control != host.RootComponent &&
+                    control.ID != null && 
+                    control.ID.Length > 0 &&
+                    FilterControl(control)) {
+                    array.Add(control.ID);
+                }
+            }
+            array.Sort(Comparer.Default);
+            return (string[])array.ToArray(typeof(string));
+        }
+
+
+        /// <devdoc>
+        /// Returns a collection of standard values retrieved from the context specified
+        /// by the specified type descriptor.
+        /// </devdoc>
+        public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) {
+            if (context == null) {
+                return null;
+            }
+
+            IDesignerHost host = (IDesignerHost)context.GetService(typeof(IDesignerHost));
+            Debug.Assert(host != null, "Unable to get IDesignerHost in ControlIDConverter");
+
+            if (host != null) {
+                string[] controlIDs = GetControls(host, context.Instance);
+                if (controlIDs == null) {
+                    return null;
+                }
+                return new StandardValuesCollection(controlIDs);
+            }
+
+            return null;
+        }
+
+
+        /// <devdoc>
+        /// Gets whether or not the context specified contains exclusive standard values.
+        /// </devdoc>
+        public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) {
+            return false;
+        }
+
+
+        /// <devdoc>
+        /// Gets whether or not the specified context contains supported standard values.
+        /// </devdoc>
+        public override bool GetStandardValuesSupported(ITypeDescriptorContext context) {
+            return (context != null);
+        }
+    }
+}
+