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//------------------------------------------------------------------------------
// <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);
}
}
}
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