Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/WebParts/ZoneLinkButton.cs

@@ -0,0 +1,80 @@
+//------------------------------------------------------------------------------
+// <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);
+            }
+        }
+
+    }
+}