565 lines
19 KiB
C#
565 lines
19 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="CheckBoxList.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.Collections;
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using System.Collections.Specialized;
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using System.ComponentModel;
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using System.Globalization;
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using System.Web;
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using System.Web.UI;
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using System.Web.Util;
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/// <devdoc>
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/// <para>Creates a group of <see cref='System.Web.UI.WebControls.CheckBox'/> controls.</para>
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/// </devdoc>
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public class CheckBoxList : ListControl, IRepeatInfoUser, INamingContainer, IPostBackDataHandler {
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private CheckBox _controlToRepeat;
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private string _oldAccessKey;
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private bool _hasNotifiedOfChange;
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private bool _cachedRegisterEnabled;
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private bool _cachedIsEnabled;
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/// <devdoc>
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/// <para>
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/// Initializes a new instance of the <see cref='System.Web.UI.WebControls.CheckBoxList'/> class.
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/// </para>
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/// </devdoc>
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public CheckBoxList() {
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_controlToRepeat = new CheckBox();
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_controlToRepeat.EnableViewState = false;
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// Whidbey 28457: We need to set a default numeric ID for the case
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// of an empty checkbox list. It is because the child CheckBox
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// always registers itself to Page as a PostBackData control and
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// during postback it will invoke LoadPostData in this class and the
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// method always assumes the ID is numeric. This default ID setting
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// has been done in this way since V1.
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_controlToRepeat.ID = "0";
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Controls.Add(_controlToRepeat);
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}
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/// <devdoc>
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/// <para>
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/// Gets or sets
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/// the padding between each item.
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/// </para>
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/// </devdoc>
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[
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WebCategory("Layout"),
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DefaultValue(-1),
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WebSysDescription(SR.CheckBoxList_CellPadding)
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]
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public virtual int CellPadding {
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get {
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if (ControlStyleCreated == false) {
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return -1;
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}
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return ((TableStyle)ControlStyle).CellPadding;
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}
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set {
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((TableStyle)ControlStyle).CellPadding = value;
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}
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}
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/// <devdoc>
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/// <para>
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/// Gets or sets
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/// the spacing between each item.
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/// </para>
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/// </devdoc>
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[
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WebCategory("Layout"),
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DefaultValue(-1),
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WebSysDescription(SR.CheckBoxList_CellSpacing)
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]
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public virtual int CellSpacing {
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get {
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if (ControlStyleCreated == false) {
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return -1;
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}
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return ((TableStyle)ControlStyle).CellSpacing;
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}
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set {
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((TableStyle)ControlStyle).CellSpacing = value;
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}
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}
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internal override bool IsMultiSelectInternal {
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get {
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// a CheckBoxList is always multiselect.
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return true;
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}
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}
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/// <summary>
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/// <para>Indicates whether the control will be rendered when the data source has no items.</para>
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/// </summary>
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[DefaultValue(false)]
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[Themeable(true)]
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[WebCategory("Behavior")]
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[WebSysDescription(SR.ListControl_RenderWhenDataEmpty)]
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public virtual bool RenderWhenDataEmpty {
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get {
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object o = ViewState["RenderWhenDataEmpty"];
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return ((o == null) ? false : (bool)o);
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}
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set {
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ViewState["RenderWhenDataEmpty"] = value;
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}
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}
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/// <devdoc>
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/// <para>Gets or sets the number of columns to repeat.</para>
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/// </devdoc>
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[
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WebCategory("Layout"),
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DefaultValue(0),
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WebSysDescription(SR.CheckBoxList_RepeatColumns)
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]
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public virtual int RepeatColumns {
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get {
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object o = ViewState["RepeatColumns"];
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return((o == null) ? 0 : (int)o);
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}
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set {
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if (value < 0) {
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throw new ArgumentOutOfRangeException("value");
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}
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ViewState["RepeatColumns"] = value;
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}
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}
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/// <devdoc>
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/// <para>Gets or sets a value that indicates whether the control is displayed
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/// vertically or horizontally.</para>
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/// </devdoc>
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[
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WebCategory("Layout"),
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DefaultValue(RepeatDirection.Vertical),
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WebSysDescription(SR.Item_RepeatDirection)
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]
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public virtual RepeatDirection RepeatDirection {
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get {
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object o = ViewState["RepeatDirection"];
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return((o == null) ? RepeatDirection.Vertical : (RepeatDirection)o);
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}
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set {
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if (value < RepeatDirection.Horizontal || value > RepeatDirection.Vertical) {
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throw new ArgumentOutOfRangeException("value");
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}
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ViewState["RepeatDirection"] = value;
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}
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}
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/// <devdoc>
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/// <para>Gets or sets a value that indicates whether the control is displayed in
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/// <see langword='Table '/>or <see langword='Flow '/>layout.</para>
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/// </devdoc>
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[
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WebCategory("Layout"),
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DefaultValue(RepeatLayout.Table),
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WebSysDescription(SR.WebControl_RepeatLayout)
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]
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public virtual RepeatLayout RepeatLayout {
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get {
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object o = ViewState["RepeatLayout"];
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return((o == null) ? RepeatLayout.Table : (RepeatLayout)o);
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}
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set {
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EnumerationRangeValidationUtil.ValidateRepeatLayout(value);
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ViewState["RepeatLayout"] = value;
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}
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}
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/// <devdoc>
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/// <para>Gets or sets
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/// the alignment of the text label associated with each checkbox.</para>
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/// </devdoc>
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[
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WebCategory("Appearance"),
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DefaultValue(TextAlign.Right),
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WebSysDescription(SR.WebControl_TextAlign)
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]
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public virtual TextAlign TextAlign {
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get {
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object align = ViewState["TextAlign"];
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return((align == null) ? TextAlign.Right : (TextAlign)align);
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}
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set {
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if (value < TextAlign.Left || value > TextAlign.Right) {
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throw new ArgumentOutOfRangeException("value");
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}
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ViewState["TextAlign"] = value;
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}
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}
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/// <internalonly/>
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/// <devdoc>
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/// <para>Creates a new control style object.</para>
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/// </devdoc>
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protected override Style CreateControlStyle() {
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return new TableStyle(ViewState);
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}
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/// <internalonly/>
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/// <devdoc>
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/// <para>Catches post data for each <see cref='System.Web.UI.WebControls.CheckBox'/> in the list.</para>
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/// </devdoc>
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protected override Control FindControl(string id, int pathOffset) {
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return this;
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}
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protected internal override void OnInit(EventArgs e) {
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base.OnInit(e);
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if (!DesignMode && !String.IsNullOrEmpty(ItemType)) {
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DataBoundControlHelper.EnableDynamicData(this, ItemType);
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}
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}
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/// <internalonly/>
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/// <devdoc>
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/// <para>Configures the <see cref='System.Web.UI.WebControls.CheckBoxList'/> prior to rendering on the client.</para>
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/// </devdoc>
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protected internal override void OnPreRender(EventArgs e) {
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base.OnPreRender(e);
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_controlToRepeat.AutoPostBack = AutoPostBack;
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_controlToRepeat.CausesValidation = CausesValidation;
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_controlToRepeat.ValidationGroup = ValidationGroup;
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if (Page != null) {
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// ensure postback data for those checkboxes which get unchecked or are different from their default value
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for (int i=0; i < Items.Count; i++) {
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SetControlToRepeatID(this, _controlToRepeat, i);
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Page.RegisterRequiresPostBack(_controlToRepeat);
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}
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}
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}
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/// <internalonly/>
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/// <devdoc>
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/// <para>
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/// Displays the <see cref='System.Web.UI.WebControls.CheckBoxList'/> on the client.
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/// </para>
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/// </devdoc>
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protected internal override void Render(HtmlTextWriter writer) {
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// Rendering an empty table is not valid xhtml or html 4, so throw
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if (RepeatLayout == RepeatLayout.Table && RenderWhenDataEmpty) {
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throw new InvalidOperationException(SR.GetString(SR.ListControl_RenderWhenDataEmptyNotSupportedWithTableLayout, ID));
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}
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// Don't render anything if the control is empty (unless the developer opts in by setting RenderWhenDataEmpty).
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// empty table is not xhtml compliant.
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if (Items.Count == 0 && !EnableLegacyRendering && !RenderWhenDataEmpty) {
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return;
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}
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RepeatInfo repeatInfo = new RepeatInfo();
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Style style = (ControlStyleCreated ? ControlStyle : null);
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short tabIndex = TabIndex;
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bool undirtyTabIndex = false;
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// TabIndex here is special... it needs to be applied to the individual
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// checkboxes and not the outer control itself
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// Set the TextAlign property.
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_controlToRepeat.TextAlign = TextAlign;
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// cache away the TabIndex property state
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_controlToRepeat.TabIndex = tabIndex;
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if (tabIndex != 0) {
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if (ViewState.IsItemDirty("TabIndex") == false) {
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undirtyTabIndex = true;
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}
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TabIndex = 0;
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}
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repeatInfo.RepeatColumns = RepeatColumns;
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repeatInfo.RepeatDirection = RepeatDirection;
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// If the device does not support tables, use the flow layout to render
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if (!DesignMode && !Context.Request.Browser.Tables) {
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repeatInfo.RepeatLayout = RepeatLayout.Flow;
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}
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else {
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repeatInfo.RepeatLayout = RepeatLayout;
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}
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if (repeatInfo.RepeatLayout == RepeatLayout.Flow) {
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repeatInfo.EnableLegacyRendering = EnableLegacyRendering;
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}
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// VSWhidbey 373655
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// Temporarily suppress AccessKey so base does not render it on the outside tag
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_oldAccessKey = AccessKey;
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AccessKey = String.Empty;
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repeatInfo.RenderRepeater(writer, (IRepeatInfoUser)this, style, this);
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// restore the state of AccessKey property
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AccessKey = _oldAccessKey;
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// restore the state of the TabIndex property
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if (tabIndex != 0) {
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TabIndex = tabIndex;
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}
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if (undirtyTabIndex) {
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ViewState.SetItemDirty("TabIndex", false);
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}
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}
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/// <internalonly/>
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/// <devdoc>
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/// <para>Processes posted data for the <see cref='System.Web.UI.WebControls.CheckBoxList'/> control.</para>
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/// </devdoc>
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bool IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) {
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return LoadPostData(postDataKey, postCollection);
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}
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/// <internalonly/>
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/// <devdoc>
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/// <para>Processes posted data for the <see cref='System.Web.UI.WebControls.CheckBoxList'/> control.</para>
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/// </devdoc>
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protected virtual bool LoadPostData(String postDataKey, NameValueCollection postCollection) {
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if (IsEnabled == false) {
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// When a CheckBoxList is disabled, then there is no postback
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// data for it. Any checked state information has been loaded
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// via view state.
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return false;
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}
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// postDataKey looks like one of two things:
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// 1. "<uniqueid>$<index>" (EffectiveClientIDMode != Static when rendered last request)
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// 2. "<uniqueid>$<id>_<index>" (EffectiveClientIDMode == Static last request)
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string strIndex = postDataKey.Substring(UniqueID.Length + 1);
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// strIndex is now either (1) "<index>" or (2) "<id>_<index>"
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// Detect case #2 by looking for an underscore. Use LastIndexOf in case <id> contains one too.
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// No need to worry about a case that looks like "<uniqueid>$<id>", it would never have been rendered that way.
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int underscoreIndex = strIndex.LastIndexOf('_');
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if (underscoreIndex != -1) {
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strIndex = strIndex.Substring(underscoreIndex + 1);
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}
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// strIndex is now definitely the index as a string, regardless of which case postDataKey was in.
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int index = Int32.Parse(strIndex, CultureInfo.InvariantCulture);
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EnsureDataBoundInLoadPostData();
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// Maintain state from the form
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if (index >= 0 && index < Items.Count) {
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ListItem item = Items[index];
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if (item.Enabled == false) {
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return false;
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}
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bool newCheckState = (postCollection[postDataKey] != null);
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if (item.Selected != newCheckState) {
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item.Selected = newCheckState;
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// LoadPostData will be invoked for each CheckBox that changed
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// Suppress multiple change notification and fire only ONE change event
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if (!_hasNotifiedOfChange) {
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_hasNotifiedOfChange = true;
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return true;
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}
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}
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}
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return false;
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}
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/// <internalonly/>
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/// <devdoc>
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/// <para>Raises when posted data for a control has changed.</para>
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/// </devdoc>
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||
|
|
void IPostBackDataHandler.RaisePostDataChangedEvent() {
|
||
|
|
RaisePostDataChangedEvent();
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/// <internalonly/>
|
||
|
|
/// <devdoc>
|
||
|
|
/// <para>Raises when posted data for a control has changed.</para>
|
||
|
|
/// </devdoc>
|
||
|
|
protected virtual void RaisePostDataChangedEvent() {
|
||
|
|
if (AutoPostBack && !Page.IsPostBackEventControlRegistered) {
|
||
|
|
// VSWhidbey 204824
|
||
|
|
Page.AutoPostBackControl = this;
|
||
|
|
|
||
|
|
if (CausesValidation) {
|
||
|
|
Page.Validate(ValidationGroup);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
OnSelectedIndexChanged(EventArgs.Empty);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/// <internalonly/>
|
||
|
|
/// <devdoc>
|
||
|
|
/// </devdoc>
|
||
|
|
bool IRepeatInfoUser.HasFooter {
|
||
|
|
get {
|
||
|
|
return HasFooter;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/// <internalonly/>
|
||
|
|
/// <devdoc>
|
||
|
|
/// </devdoc>
|
||
|
|
protected virtual bool HasFooter {
|
||
|
|
get {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/// <internalonly/>
|
||
|
|
/// <devdoc>
|
||
|
|
/// </devdoc>
|
||
|
|
bool IRepeatInfoUser.HasHeader {
|
||
|
|
get {
|
||
|
|
return HasHeader;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/// <internalonly/>
|
||
|
|
/// <devdoc>
|
||
|
|
/// </devdoc>
|
||
|
|
protected virtual bool HasHeader {
|
||
|
|
get {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/// <internalonly/>
|
||
|
|
/// <devdoc>
|
||
|
|
/// </devdoc>
|
||
|
|
bool IRepeatInfoUser.HasSeparators {
|
||
|
|
get {
|
||
|
|
return HasSeparators;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/// <internalonly/>
|
||
|
|
/// <devdoc>
|
||
|
|
/// </devdoc>
|
||
|
|
protected virtual bool HasSeparators {
|
||
|
|
get {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/// <internalonly/>
|
||
|
|
/// <devdoc>
|
||
|
|
/// </devdoc>
|
||
|
|
int IRepeatInfoUser.RepeatedItemCount {
|
||
|
|
get {
|
||
|
|
return RepeatedItemCount;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/// <internalonly/>
|
||
|
|
/// <devdoc>
|
||
|
|
/// </devdoc>
|
||
|
|
protected virtual int RepeatedItemCount {
|
||
|
|
get {
|
||
|
|
return (Items != null) ? Items.Count : 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/// <internalonly/>
|
||
|
|
/// <devdoc>
|
||
|
|
/// </devdoc>
|
||
|
|
Style IRepeatInfoUser.GetItemStyle(ListItemType itemType, int repeatIndex) {
|
||
|
|
return GetItemStyle(itemType, repeatIndex);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
protected virtual Style GetItemStyle(ListItemType itemType, int repeatIndex) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/// <internalonly/>
|
||
|
|
/// <devdoc>
|
||
|
|
/// Called by the RepeatInfo helper to render each item
|
||
|
|
/// </devdoc>
|
||
|
|
void IRepeatInfoUser.RenderItem(ListItemType itemType, int repeatIndex, RepeatInfo repeatInfo, HtmlTextWriter writer) {
|
||
|
|
RenderItem(itemType, repeatIndex, repeatInfo, writer);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/// <internalonly/>
|
||
|
|
/// <devdoc>
|
||
|
|
/// Called by the RepeatInfo helper to render each item
|
||
|
|
/// </devdoc>
|
||
|
|
protected virtual void RenderItem(ListItemType itemType, int repeatIndex, RepeatInfo repeatInfo, HtmlTextWriter writer) {
|
||
|
|
if (repeatIndex == 0) {
|
||
|
|
_cachedIsEnabled = IsEnabled;
|
||
|
|
_cachedRegisterEnabled = (Page != null) && IsEnabled && (SaveSelectedIndicesViewState == false);
|
||
|
|
}
|
||
|
|
|
||
|
|
int repeatIndexOffset = repeatIndex;
|
||
|
|
|
||
|
|
ListItem item = Items[repeatIndexOffset];
|
||
|
|
|
||
|
|
// VSWhidbey 403433 Render expando attributes.
|
||
|
|
_controlToRepeat.Attributes.Clear();
|
||
|
|
if (item.HasAttributes) {
|
||
|
|
foreach (string key in item.Attributes.Keys) {
|
||
|
|
_controlToRepeat.Attributes[key] = item.Attributes[key];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Dev10 684108: reset the CssClass for each item.
|
||
|
|
if (!string.IsNullOrEmpty(_controlToRepeat.CssClass)) {
|
||
|
|
_controlToRepeat.CssClass = "";
|
||
|
|
}
|
||
|
|
|
||
|
|
if (RenderingCompatibility >= VersionUtil.Framework40) {
|
||
|
|
_controlToRepeat.InputAttributes.Add("value", item.Value);
|
||
|
|
}
|
||
|
|
SetControlToRepeatID(this, _controlToRepeat, repeatIndexOffset);
|
||
|
|
_controlToRepeat.Text = item.Text;
|
||
|
|
_controlToRepeat.Checked = item.Selected;
|
||
|
|
_controlToRepeat.Enabled = _cachedIsEnabled && item.Enabled;
|
||
|
|
_controlToRepeat.AccessKey = _oldAccessKey;
|
||
|
|
|
||
|
|
if (_cachedRegisterEnabled && _controlToRepeat.Enabled) {
|
||
|
|
// Store a client-side array of enabled control, so we can re-enable them on
|
||
|
|
// postback (in case they are disabled client-side)
|
||
|
|
// Postback is needed when SelectedIndices is not saved in view state
|
||
|
|
Page.RegisterEnabledControl(_controlToRepeat);
|
||
|
|
}
|
||
|
|
|
||
|
|
_controlToRepeat.RenderControl(writer);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|