Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,185 @@
+//------------------------------------------------------------------------------
+// <copyright file="HtmlInputCheckBox.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+/*
+ * HtmlInputCheckBox.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.Globalization;
+    using System.Web;
+    using System.Web.UI;
+    using System.Security.Permissions;
+
+
+/// <devdoc>
+///    <para>
+///       The <see langword='HtmlInputCheckBox'/> class defines the methods,
+///       properties, and events for the HtmlInputCheckBox control. This class allows
+///       programmatic access to the HTML &lt;input type=
+///       checkbox&gt;
+///       element on the server.
+///    </para>
+/// </devdoc>
+    [
+    DefaultEvent("ServerChange"),
+    SupportsEventValidation,
+    ]
+    public class HtmlInputCheckBox : HtmlInputControl, IPostBackDataHandler {
+
+        private static readonly object EventServerChange = new object();
+
+        /*
+         *  Creates an intrinsic Html INPUT type=checkbox control.
+         */
+
+        /// <devdoc>
+        /// <para>Initializes a new instance of a <see cref='System.Web.UI.HtmlControls.HtmlInputCheckBox'/> class.</para>
+        /// </devdoc>
+        public HtmlInputCheckBox() : base("checkbox") {
+        }
+
+        /*
+         * Checked property.
+         */
+
+        /// <devdoc>
+        ///    <para>Gets or sets a value indicating whether the checkbox is
+        ///       currently selected.</para>
+        /// </devdoc>
+        [
+        WebCategory("Default"),
+        DefaultValue(""),
+        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
+        TypeConverter(typeof(MinimizableAttributeTypeConverter))
+        ]
+        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;
+            }
+        }
+
+        /*
+        * Adds an event handler for the OnServerChange event.
+        *  value: New handler to install for this event.
+        */
+
+        /// <devdoc>
+        ///    <para>Occurs when </para>
+        /// </devdoc>
+        [
+        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 unless
+            // we are disabled
+            if (Events[EventServerChange] == null && !Disabled) {
+                ViewState.SetItemDirty("checked",false);
+            }
+        }
+
+        /*
+         * Method used to raise the OnServerChange event.
+         */
+
+        /// <devdoc>
+        ///    <para>[To be supplied.]</para>
+        /// </devdoc>
+        protected virtual void OnServerChange(EventArgs e) {
+            // invoke delegates AFTER binding
+            EventHandler handler = (EventHandler)Events[EventServerChange];
+            if (handler != null) handler(this, e);
+        }
+
+        /*
+         * Method of IPostBackDataHandler interface to process posted data.
+         * Checkbox determines the posted Checked state.
+         */
+
+        /// <internalonly/>
+        bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection) {
+            return LoadPostData(postDataKey, postCollection);
+        }
+
+
+        /// <internalonly/>
+        protected virtual bool LoadPostData(string postDataKey, NameValueCollection postCollection) {
+            string post = postCollection[postDataKey];
+            bool newValue = !String.IsNullOrEmpty(post);
+            bool valueChanged = (newValue != Checked);
+            Checked = newValue;
+
+            if (newValue) {
+                ValidateEvent(postDataKey);
+            }
+
+            return valueChanged;
+        }
+
+        protected override void RenderAttributes(HtmlTextWriter writer) {
+            base.RenderAttributes(writer);
+
+            if (Page != null) {
+                Page.ClientScript.RegisterForEventValidation(RenderedNameAttribute);
+            }
+        }
+
+        /*
+         * Method of IPostBackDataHandler interface which is invoked whenever
+         * posted data for a control has changed.  RadioButton fires an
+         * OnServerChange event.
+         */
+
+        /// <internalonly/>
+        void IPostBackDataHandler.RaisePostDataChangedEvent() {
+            RaisePostDataChangedEvent();
+        }
+
+
+        /// <internalonly/>
+        protected virtual void RaisePostDataChangedEvent() {
+            OnServerChange(EventArgs.Empty);
+        }
+    }
+}