Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web.Mobile/UI/MobileControls/Design/Util/HeaderLabel.cs

@@ -0,0 +1,65 @@
+//------------------------------------------------------------------------------
+// <copyright file="HeaderLabel.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI.Design.MobileControls.Util
+{
+    using System;
+    using System.Diagnostics;
+    using System.Drawing;
+    using System.Windows.Forms;
+    
+    [
+        System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand,
+        Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)
+    ]
+    [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")]
+    internal class HeaderLabel : RichTextBox
+    {
+        private String _text;
+        
+        internal HeaderLabel()
+        {
+            BackColor = SystemColors.Control;
+            BorderStyle = BorderStyle.None;
+            WordWrap = true;
+            ReadOnly = true;
+            TabStop = false;
+            ScrollBars = RichTextBoxScrollBars.None;
+            VisibleChanged += new EventHandler(OnVisibleChanged);
+        }
+
+        protected override void OnContentsResized(ContentsResizedEventArgs e)
+        {
+            HeaderPanel headerPanel = Parent as HeaderPanel;
+            
+            Debug.Assert(headerPanel != null,
+                "HeaderLabel should be placed inside of a HeaderPanel.");
+            headerPanel.RequestNewHeight(this, e.NewRectangle.Height);
+            base.OnContentsResized(e);
+        }
+
+        public override String Text
+        {
+            get
+            {
+                return _text;
+            }
+
+            set
+            {
+                _text = value;
+            }
+        }
+
+        private void OnVisibleChanged(Object sender, EventArgs e)
+        {
+            if(Visible && _text != base.Text)
+            {
+                base.Text = _text;
+            }
+        }
+    }
+}