ZoneLinkButton.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebParts / ZoneLinkButton.cs / 1 / ZoneLinkButton.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.WebControls.WebParts { 
 
    using System;
    using System.ComponentModel; 
    using System.Web.UI.WebControls;

    /// 
    ///  
    [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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