Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/WebControls/DataControlLinkButton.cs

@@ -0,0 +1,102 @@
+//------------------------------------------------------------------------------
+// <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;
+                    }
+                }
+            }
+        }
+    }
+}
+