Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/UI/WebControls/ContentPlaceHolder.cs

@@ -0,0 +1,108 @@
+//------------------------------------------------------------------------------
+// <copyright file="ContentPlaceHolder.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI.WebControls {
+
+    using System;
+    using System.Collections;
+    using System.ComponentModel;
+    using System.Web.UI;
+    using System.Web.Util;
+
+    internal class ContentPlaceHolderBuilder : ControlBuilder {
+
+        private string _contentPlaceHolderID;
+        private string _templateName;
+
+        internal string Name { get { return _templateName; } }
+
+        public override void Init(TemplateParser parser, ControlBuilder parentBuilder,
+                                  Type type, string tagName, string ID, IDictionary attribs) {
+
+            // Copy the ID so that it will be available when BuildObject is called
+            _contentPlaceHolderID = ID;
+
+            if (parser.FInDesigner) {
+                // shortcut for designer
+                base.Init(parser, parentBuilder, type, tagName, ID, attribs);
+                return;
+            }
+
+            if (String.IsNullOrEmpty(ID)) {
+                throw new HttpException(SR.GetString(SR.Control_Missing_Attribute, "ID", type.Name));
+            }
+
+            _templateName = ID;
+
+            MasterPageParser masterPageParser = parser as MasterPageParser;
+            if (masterPageParser == null) {
+                throw new HttpException(SR.GetString(SR.ContentPlaceHolder_only_in_master));
+            }
+
+			base.Init(parser, parentBuilder, type, tagName, ID, attribs);
+
+            if (masterPageParser.PlaceHolderList.Contains(Name))
+                throw new HttpException(SR.GetString(SR.ContentPlaceHolder_duplicate_contentPlaceHolderID, Name));
+
+            masterPageParser.PlaceHolderList.Add(Name);
+        }
+
+        public override object BuildObject() {
+            MasterPage masterPage = TemplateControl as MasterPage;
+
+            Debug.Assert(masterPage != null || InDesigner);
+
+            // Instantiate the ContentPlaceHolder
+            ContentPlaceHolder cph = (ContentPlaceHolder) base.BuildObject();
+
+            // If the page is providing content, instantiate it in the holder
+            if (PageProvidesMatchingContent(masterPage)) {
+                ITemplate tpl = ((System.Web.UI.ITemplate)(masterPage.ContentTemplates[_contentPlaceHolderID]));
+                masterPage.InstantiateInContentPlaceHolder(cph, tpl);
+            }
+
+            return cph;
+        }
+
+        internal override void BuildChildren(object parentObj) {
+
+            MasterPage masterPage = TemplateControl as MasterPage;
+
+            // If the page is providing content, don't call the base, which would
+            // instantiate the default content (which we don't want)
+            if (PageProvidesMatchingContent(masterPage))
+                return;
+
+            base.BuildChildren(parentObj);
+        }
+
+        private bool PageProvidesMatchingContent(MasterPage masterPage) {
+
+            if (masterPage != null && masterPage.ContentTemplates != null
+                        && masterPage.ContentTemplates.Contains(_contentPlaceHolderID)) {
+                return true;
+            }
+
+            return false;
+        }
+    }
+
+    // Factory used to efficiently create builder instances
+    internal class ContentPlaceHolderBuilderFactory: IWebObjectFactory {
+        object IWebObjectFactory.CreateInstance() {
+            return new ContentPlaceHolderBuilder();
+        }
+    }
+
+    [ControlBuilderAttribute(typeof(ContentPlaceHolderBuilder))]
+    [Designer("System.Web.UI.Design.WebControls.ContentPlaceHolderDesigner, " + AssemblyRef.SystemDesign)]
+    [ToolboxItemFilter("System.Web.UI")]
+    [ToolboxItemFilter("Microsoft.VisualStudio.Web.WebForms.MasterPageWebFormDesigner", ToolboxItemFilterType.Require)]
+    [ToolboxData("<{0}:ContentPlaceHolder runat=\"server\"></{0}:ContentPlaceHolder>")]
+
+    public class ContentPlaceHolder : Control, INonBindingContainer {
+    }
+}