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