103 lines
3.6 KiB
C#
103 lines
3.6 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="DataControlLinkButton.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.Drawing;
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using System.Web.Util;
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/// <devdoc>
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/// Derived version of LinkButton used within a DataControl.
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/// </devdoc>
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[SupportsEventValidation]
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internal class DataControlLinkButton : LinkButton {
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IPostBackContainer _container;
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string _callbackArgument;
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bool _enableCallback;
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internal DataControlLinkButton(IPostBackContainer container) {
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_container = container;
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}
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public override bool CausesValidation {
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get {
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if (_container != null) {
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return false;
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}
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return base.CausesValidation;
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}
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set {
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if (_container != null) {
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throw new NotSupportedException(SR.GetString(SR.CannotSetValidationOnDataControlButtons));
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}
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base.CausesValidation = value;
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}
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}
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internal void EnableCallback(string argument) {
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_enableCallback = true;
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_callbackArgument = argument;
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}
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protected override PostBackOptions GetPostBackOptions() {
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if (_container != null) {
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return _container.GetPostBackOptions(this);
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}
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return base.GetPostBackOptions();
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}
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protected internal override void Render(HtmlTextWriter writer) {
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SetCallbackProperties();
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SetForeColor();
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base.Render(writer);
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}
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private void SetCallbackProperties() {
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if (_enableCallback) {
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ICallbackContainer _callbackContainer = _container as ICallbackContainer;
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if (_callbackContainer != null) {
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string callbackScript = _callbackContainer.GetCallbackScript(this, _callbackArgument);
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if (!String.IsNullOrEmpty(callbackScript)) {
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this.OnClientClick = callbackScript;
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}
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}
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}
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}
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/// <devdoc>
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/// In HTML hyperlinks always use the browser's link color.
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/// For the DataControl, we want all LinkButtons to honor the ForeColor setting.
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/// This requires looking up into the control hierarchy to see if either the cell
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/// or the containing row or table define a ForeColor.
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/// </devdoc>
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protected virtual void SetForeColor() {
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if (ControlStyle.IsSet(System.Web.UI.WebControls.Style.PROP_FORECOLOR) == false) {
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Color hyperLinkForeColor;
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Control control = this;
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for (int i = 0; i < 3; i++) {
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control = control.Parent;
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Debug.Assert(((i == 0) && (control is TableCell)) ||
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((i == 1) && (control is TableRow)) ||
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((i == 2) && (control is Table)));
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hyperLinkForeColor = ((WebControl)control).ForeColor;
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if (hyperLinkForeColor != Color.Empty) {
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ForeColor = hyperLinkForeColor;
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break;
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}
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}
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}
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}
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}
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}
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