Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

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+//------------------------------------------------------------------------------
+// <copyright file="HtmlButton.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+/*
+ * HtmlButton.cs
+ *
+ * Copyright (c) 2000 Microsoft Corporation
+ */
+
+namespace System.Web.UI.HtmlControls {
+    using System.ComponentModel;
+    using System;
+    using System.Collections;
+    using System.Web;
+    using System.Web.UI;
+    using System.Security.Permissions;
+
+
+    /// <devdoc>
+    /// <para>The <see langword='HtmlButton'/> 
+    /// class defines the methods, properties and events for the
+    /// <see langword='HtmlButton'/>
+    /// control. This
+    /// class allows programmatic access to the HTML &lt;button&gt; element
+    /// on the server.</para>
+    /// </devdoc>
+    [
+    DefaultEvent("ServerClick"),
+    SupportsEventValidation,
+    ]
+    public class HtmlButton : HtmlContainerControl, IPostBackEventHandler {
+
+        private static readonly object EventServerClick = new object();
+
+
+        /*
+         *  Creates an intrinsic Html BUTTON control.
+         */
+
+        /// <devdoc>
+        /// <para>Initializes a new instance of a <see cref='System.Web.UI.HtmlControls.HtmlButton'/> class.</para>
+        /// </devdoc>
+        public HtmlButton() : base("button") {
+        }
+
+
+        /// <devdoc>
+        ///    <para>Gets or sets whether pressing the button causes page validation to fire. This defaults to True so that when
+        ///          using validation controls, the validation state of all controls are updated when the button is clicked, both
+        ///          on the client and the server. Setting this to False is useful when defining a cancel or reset button on a page
+        ///          that has validators.</para>
+        /// </devdoc>
+        [
+        WebCategory("Behavior"),
+        DefaultValue(true),
+        ]
+        public virtual bool CausesValidation {
+            get {
+                object b = ViewState["CausesValidation"];
+                return((b == null) ? true : (bool)b);
+            }
+            set {
+                ViewState["CausesValidation"] = value;
+            }
+        }
+
+
+        [
+        WebCategory("Behavior"),
+        DefaultValue(""),
+        WebSysDescription(SR.PostBackControl_ValidationGroup)
+        ]
+        public virtual string ValidationGroup {
+            get {
+                string s = (string)ViewState["ValidationGroup"];
+                return((s == null) ? String.Empty : s);
+            }
+            set {
+                ViewState["ValidationGroup"] = value;
+            }
+        }
+
+
+        /// <devdoc>
+        /// <para>Occurs when the user clicks an <see cref='System.Web.UI.HtmlControls.HtmlButton'/> control on the
+        ///    browser.</para>
+        /// </devdoc>
+        [
+        WebCategory("Action"),
+        WebSysDescription(SR.HtmlControl_OnServerClick)
+        ]
+        public event EventHandler ServerClick {
+            add {
+                Events.AddHandler(EventServerClick, value);
+            }
+            remove {
+                Events.RemoveHandler(EventServerClick, value);
+            }
+        }
+
+
+        /// <internalonly/>
+        protected internal override void OnPreRender(EventArgs e) {
+            base.OnPreRender(e);
+            if (Page != null && Events[EventServerClick] != null)
+                Page.RegisterPostBackScript();
+        }
+
+        /*
+         * Override to generate postback code for onclick.
+         */
+
+        /// <internalonly/>
+        /// <devdoc>
+        /// </devdoc>
+        protected override void RenderAttributes(HtmlTextWriter writer) {
+
+            bool submitsProgramatically = (Events[EventServerClick] != null);
+            if (Page != null && submitsProgramatically) {
+                Util.WriteOnClickAttribute(
+                        writer, this, false, true,
+                        (CausesValidation && Page.GetValidators(ValidationGroup).Count > 0),
+                        ValidationGroup);
+            }
+
+            base.RenderAttributes(writer);
+        }
+
+
+        /// <devdoc>
+        /// <para>Raises the <see langword='ServerClick'/>
+        /// event.</para>
+        /// </devdoc>
+        protected virtual void OnServerClick(EventArgs e) {
+            EventHandler handler = (EventHandler)Events[EventServerClick];
+            if (handler != null) handler(this, e);
+        }
+
+        /*
+         * Method of IPostBackDataHandler interface to raise events on post back.
+         * Button fires an OnServerClick event.
+         */
+
+        /// <internalonly/>
+        /// <devdoc>
+        /// </devdoc>
+        void IPostBackEventHandler.RaisePostBackEvent(string eventArgument) {
+            RaisePostBackEvent(eventArgument);
+        }
+
+
+        /// <internalonly/>
+        /// <devdoc>
+        /// </devdoc>
+        protected virtual void RaisePostBackEvent(string eventArgument) {
+            ValidateEvent(UniqueID, eventArgument);
+
+            if (CausesValidation) {
+                Page.Validate(ValidationGroup);
+            }
+            OnServerClick(EventArgs.Empty);
+        }
+    }
+}