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//------------------------------------------------------------------------------
// <copyright file="ZoneLinkButton.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI.WebControls.WebParts {
using System;
using System.ComponentModel;
using System.Web.UI.WebControls;
/// <devdoc>
/// </devdoc>
[SupportsEventValidation]
internal sealed class ZoneLinkButton : LinkButton {
private WebZone _owner;
private string _eventArgument;
private string _imageUrl;
public ZoneLinkButton(WebZone owner, string eventArgument) {
if (owner == null) {
throw new ArgumentNullException("owner");
}
_owner = owner;
_eventArgument = eventArgument;
}
public string ImageUrl {
get {
return (_imageUrl != null) ? _imageUrl : String.Empty;
}
set {
_imageUrl = value;
}
}
protected override PostBackOptions GetPostBackOptions() {
// _owner.Page may be null in the designer
if (!String.IsNullOrEmpty(_eventArgument) && _owner.Page != null) {
PostBackOptions options = new PostBackOptions(_owner, _eventArgument);
options.RequiresJavaScriptProtocol = true;
return options;
}
return base.GetPostBackOptions();
}
protected internal override void RenderContents(HtmlTextWriter writer) {
// Copied from HyperLink.RenderContents() and modified slightly
string imageUrl = ImageUrl;
if (!String.IsNullOrEmpty(imageUrl)) {
Image image = new Image();
// NOTE: The Url resolution happens right here, because the image is not parented
// and will not be able to resolve when it tries to do so.
image.ImageUrl = ResolveClientUrl(imageUrl);
string toolTip = ToolTip;
if (!String.IsNullOrEmpty(toolTip)) {
image.ToolTip = toolTip;
}
string text = Text;
if (!String.IsNullOrEmpty(text)) {
image.AlternateText = text;
}
image.Page = Page;
image.RenderControl(writer);
}
else {
base.RenderContents(writer);
}
}
}
}
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