Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,85 @@
+//------------------------------------------------------------------------------
+// <copyright file="HeaderPanel.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 HeaderPanel : Panel
+    {
+        private int _recursionCount = 0;
+        
+        internal void RequestNewHeight(HeaderLabel header, int height)
+        {
+            int offset = height - header.Height;
+ 
+            try
+            {
+                // This is a workaround for a RTB issue that causes their
+                // algorithm to ---- up if OnContentsResize recurses.  (Now
+                // that HeaderLabel does not resize the text untill after
+                // autoscaling, we do not seem to hit this, but just in case).
+                // 
+                // On the first call the RTB guesses its best dimensions
+                // for the given text.  We correct the Width which may cause
+                // a second recursive call to adjust the height.
+
+                if(_recursionCount < 2)
+                {
+                    _recursionCount++;
+                    header.Height = height;
+                    
+                    // 
+                    foreach(Control child in Controls)
+                    {
+                        if(child.Top > header.Top)
+                        {
+                            child.Top += offset;
+                        }
+                    }
+
+                    for(
+                        Control controlIterator = this;
+                        controlIterator != null;
+                        controlIterator = controlIterator.Parent
+                    ) {
+                        controlIterator.Height += offset;
+                    }
+                }
+                else
+                {
+                    Debug.Assert(offset == 0,
+                        "On 3rd recursive call offset is not yet stabalized."
+                    );
+                }
+            }
+            finally
+            {
+                _recursionCount = 0;
+            }
+        }
+
+        protected override void OnSizeChanged(EventArgs e)
+        {
+            foreach(Control child in Controls)
+            {
+                if(child is HeaderLabel)
+                {
+                    child.Width = Width;
+                }
+            }
+            base.OnSizeChanged(e);
+        }
+    }
+}