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//------------------------------------------------------------------------------
// <copyright file="ChildTable.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI.WebControls {
using System;
using System.ComponentModel;
using System.Web.UI;
using System.Web.Util;
[
ToolboxItem(false),
SupportsEventValidation,
]
/// <internalonly/>
/// <devdoc>
/// Used by composite controls that are based on a table, that only render
/// their contents.
/// Used to render out an ID attribute representing the parent composite control
/// if an ID is not actually set on this table.
/// </devdoc>
internal class ChildTable : Table {
private int _parentLevel;
private string _parentID;
private bool _parentIDSet;
/// <internalonly/>
internal ChildTable() : this(1) {
}
/// <internalonly/>
internal ChildTable(int parentLevel) {
Debug.Assert(parentLevel >= 1);
_parentLevel = parentLevel;
_parentIDSet = false;
}
internal ChildTable(string parentID) {
_parentID = parentID;
_parentIDSet = true;
}
/// <internalonly/>
protected override void AddAttributesToRender(HtmlTextWriter writer) {
base.AddAttributesToRender(writer);
string parentID = _parentID;
if (!_parentIDSet) {
parentID = GetParentID();
}
if (parentID != null) {
writer.AddAttribute(HtmlTextWriterAttribute.Id, parentID);
}
}
/// <devdoc>
/// Gets the ClientID of the parent whose ID is supposed to be used in the rendering.
/// </devdoc>
private string GetParentID() {
if (ID != null) {
return null;
}
Control parent = this;
for (int i = 0; i < _parentLevel; i++) {
parent = parent.Parent;
if (parent == null) {
break;
}
}
Debug.Assert(parent != null);
if (parent != null) {
string id = parent.ID;
if (!String.IsNullOrEmpty(id)) {
return parent.ClientID;
}
}
return null;
}
}
}
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