Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/HtmlControls/HtmlInputRadioButton.cs

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+//------------------------------------------------------------------------------
+// <copyright file="HtmlInputRadioButton.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+/*
+ * HtmlInputRadioButton.cs
+ *
+ * Copyright (c) 2000 Microsoft Corporation
+ */
+
+namespace System.Web.UI.HtmlControls {
+    using System.ComponentModel;
+    using System;
+    using System.Collections;
+    using System.Collections.Specialized;
+    using System.Web;
+    using System.Web.UI;
+    using System.Security.Permissions;
+
+
+/// <devdoc>
+///    <para>
+///       The <see langword='HtmlInputRadioButton'/> class defines the methods,
+///       properties, and events for the HtmlInputRadio control. This class allows
+///       programmatic access to the HTML &lt;input type=
+///       radio&gt;
+///       element on the server.
+///    </para>
+/// </devdoc>
+    [
+    DefaultEvent("ServerChange"),
+    SupportsEventValidation,
+    ]
+    public class HtmlInputRadioButton : HtmlInputControl, IPostBackDataHandler {
+
+        private static readonly object EventServerChange = new object();
+
+        /*
+         * Creates an intrinsic Html INPUT type=radio control.
+         */
+
+        public HtmlInputRadioButton() : base("radio") {
+        }
+
+        /*
+         * Checked property.
+         */
+
+        /// <devdoc>
+        ///    <para>
+        ///       Gets or sets a value indicating whether a radio button is
+        ///       currently selected or not.
+        ///    </para>
+        /// </devdoc>
+        [
+        WebCategory("Default"),
+        DefaultValue(""),
+        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
+        ]
+        public bool Checked {
+            get {
+                string s = Attributes["checked"];
+                return((s != null) ? (s.Equals("checked")) : false);
+            }
+            set {
+                if (value)
+                    Attributes["checked"] = "checked";
+                else
+                    Attributes["checked"] = null;
+            }
+        }
+
+
+        /// <devdoc>
+        ///    <para>
+        ///       Gets the value of the HTML
+        ///       Name attribute that will be rendered to the browser.
+        ///    </para>
+        /// </devdoc>
+        public override string Name {
+            get {
+                string s = Attributes["name"];
+                return ((s != null) ? s : String.Empty);
+            }
+            set {
+                Attributes["name"] = MapStringAttributeToString(value);
+            }
+        }
+
+
+        /// <devdoc>
+        ///    <para>
+        ///       Gets or sets the contents of a text box.
+        ///    </para>
+        /// </devdoc>
+        public override string Value {
+            get {
+                string val = base.Value;
+
+                if (val.Length != 0)
+                    return val;
+
+                val = ID;
+                if (val != null)
+                    return val;
+
+                // if specific value is not provided, use the UniqueID
+                return UniqueID;
+            }
+            set {
+                base.Value = value;
+            }
+        }
+
+        // Value that gets rendered for the Name attribute
+        internal override string RenderedNameAttribute {
+            get {
+                // For radio buttons, we must make the name unique, but can't just use the
+                // UniqueID because all buttons in a group must have the same name.  So
+                // we replace the last part of the UniqueID with the group Name.
+                string name = base.RenderedNameAttribute;
+                string uid = UniqueID;
+                int lastColon = uid.LastIndexOf(IdSeparator);
+                if (lastColon >= 0)
+                    name = uid.Substring(0, lastColon+1) + name;
+                return name;
+            }
+        }
+
+
+        [
+        WebCategory("Action"),
+        WebSysDescription(SR.Control_OnServerCheckChanged)
+        ]
+        public event EventHandler ServerChange {
+            add {
+                Events.AddHandler(EventServerChange, value);
+            }
+            remove {
+                Events.RemoveHandler(EventServerChange, value);
+            }
+        }
+
+        /*
+         * This method is invoked just prior to rendering.
+         */
+
+        /// <internalonly/>
+        /// <devdoc>
+        /// </devdoc>
+        protected internal override void OnPreRender(EventArgs e) {
+            base.OnPreRender(e);
+
+            if (Page != null && !Disabled) {
+                Page.RegisterRequiresPostBack(this);
+
+                Page.RegisterEnabledControl(this);
+            }
+
+            // if no change handler, no need to save posted property
+            if (Events[EventServerChange] == null && !Disabled) {
+                ViewState.SetItemDirty("checked",false);
+            }
+        }
+
+        /*
+         * Method used to raise the OnServerChange event.
+         */
+
+        /// <devdoc>
+        /// </devdoc>
+        protected virtual void OnServerChange(EventArgs e) {
+            EventHandler handler = (EventHandler)Events[EventServerChange];
+            if (handler != null) handler(this, e);
+        }
+
+
+        /// <internalonly/>
+        /// <devdoc>
+        /// </devdoc>
+        protected override void RenderAttributes(HtmlTextWriter writer) {
+            if (Page != null) {
+                Page.ClientScript.RegisterForEventValidation(Value, RenderedNameAttribute);
+            }
+
+            writer.WriteAttribute("value", Value);
+            Attributes.Remove("value");
+            base.RenderAttributes(writer);
+        }
+
+        /*
+         * Method of IPostBackDataHandler interface to process posted data.
+         * RadioButton determines the posted radio group state.
+         */
+
+        /// <internalonly/>
+        /// <devdoc>
+        /// </devdoc>
+        bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection) {
+            return LoadPostData(postDataKey, postCollection);
+        }
+
+
+        /// <internalonly/>
+        /// <devdoc>
+        /// </devdoc>
+        protected virtual bool LoadPostData(string postDataKey, NameValueCollection postCollection) {
+            string postValue = postCollection[RenderedNameAttribute];
+            bool valueChanged = false;
+            if ((postValue != null) && postValue.Equals(Value)) {
+                if (Checked == false) {
+
+                    ValidateEvent(Value, RenderedNameAttribute);
+
+                    Checked = true;
+                    // only fire change event for RadioButton that is being checked
+                    valueChanged = true;
+                }
+            }
+            else {
+                if (Checked == true) {
+                    Checked = false;
+                }
+            }
+
+            return valueChanged;
+        }
+
+        /*
+         * Method of IPostBackDataHandler interface which is invoked whenever posted data
+         * for a control has changed.  RadioButton fires an OnServerChange event.
+         */
+
+        /// <internalonly/>
+        /// <devdoc>
+        /// </devdoc>
+        void IPostBackDataHandler.RaisePostDataChangedEvent() {
+            RaisePostDataChangedEvent();
+        }
+
+
+        /// <internalonly/>
+        /// <devdoc>
+        /// </devdoc>
+        protected virtual void RaisePostDataChangedEvent() {
+            OnServerChange(EventArgs.Empty);
+        }
+    }
+}