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