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