Implemented collapsible columns.

src/Orchard.Web/Modules/Orchard.DynamicForms/Drivers/CheckboxElementDriver.cs

@@ -64,7 +64,7 @@ namespace Orchard.DynamicForms.Drivers {
             });
         }
 
-        protected override void OnDisplaying(CheckBox element, ElementDisplayContext context) {
+        protected override void OnDisplaying(CheckBox element, ElementDisplayingContext context) {
             context.ElementShape.TokenizedValue = _tokenizer.Replace(element.RuntimeValue, null);
         }
     }

src/Orchard.Web/Modules/Orchard.DynamicForms/Drivers/CommonFormElementDriver.cs

@@ -41,7 +41,7 @@ namespace Orchard.DynamicForms.Drivers {
             });
         }
 
-        protected override void OnDisplaying(FormElement element, ElementDisplayContext context) {
+        protected override void OnDisplaying(FormElement element, ElementDisplayingContext context) {
             context.ElementShape.Metadata.Wrappers.Add("FormElement_Wrapper");
             context.ElementShape.Child.Add(New.PlaceChildContent(Source: context.ElementShape));
 

src/Orchard.Web/Modules/Orchard.DynamicForms/Drivers/EmailFieldElementDriver.cs

@@ -75,7 +75,7 @@ namespace Orchard.DynamicForms.Drivers {
             });
         }
 
-        protected override void OnDisplaying(EmailField element, ElementDisplayContext context) {
+        protected override void OnDisplaying(EmailField element, ElementDisplayingContext context) {
             context.ElementShape.TokenizedValue = _tokenizer.Replace(element.RuntimeValue, null);
         }
     }

src/Orchard.Web/Modules/Orchard.DynamicForms/Drivers/EnumerationElementDriver.cs

@@ -79,7 +79,7 @@ namespace Orchard.DynamicForms.Drivers {
             });
         }
 
-        protected override void OnDisplaying(Enumeration element, ElementDisplayContext context) {
+        protected override void OnDisplaying(Enumeration element, ElementDisplayingContext context) {
             var tokenizedOptions = _tokenizer.Replace(element.Options).ToArray();
             var typeName = element.GetType().Name;
             var displayType = context.DisplayType;

src/Orchard.Web/Modules/Orchard.DynamicForms/Drivers/FormElementDriver.cs

@@ -128,7 +128,7 @@ namespace Orchard.DynamicForms.Drivers {
             });
         }
 
-        protected override void OnDisplaying(Form element, ElementDisplayContext context) {
+        protected override void OnDisplaying(Form element, ElementDisplayingContext context) {
             var controller = _currentControllerAccessor.CurrentController;
             var values = controller.FetchPostedValues(element);
             var modelState = controller.FetchModelState(element);

src/Orchard.Web/Modules/Orchard.DynamicForms/Drivers/HiddenFieldElementDriver.cs

@@ -33,7 +33,7 @@ namespace Orchard.DynamicForms.Drivers {
             });
         }
 
-        protected override void OnDisplaying(HiddenField element, ElementDisplayContext context) {
+        protected override void OnDisplaying(HiddenField element, ElementDisplayingContext context) {
             context.ElementShape.TokenizedValue = _tokenizer.Replace(element.Value, null);
         }
     }

src/Orchard.Web/Modules/Orchard.DynamicForms/Drivers/QueryElementDriver.cs

@@ -116,7 +116,7 @@ namespace Orchard.DynamicForms.Drivers {
             });
         }
 
-        protected override void OnDisplaying(Query element, ElementDisplayContext context) {
+        protected override void OnDisplaying(Query element, ElementDisplayingContext context) {
             var queryId = element.QueryId;
             var typeName = element.GetType().Name;
             var category = element.Category.ToSafeName();

src/Orchard.Web/Modules/Orchard.DynamicForms/Drivers/RadioButtonElementDriver.cs

@@ -39,7 +39,7 @@ namespace Orchard.DynamicForms.Drivers {
             });
         }
 
-        protected override void OnDisplaying(RadioButton element, ElementDisplayContext context) {
+        protected override void OnDisplaying(RadioButton element, ElementDisplayingContext context) {
             context.ElementShape.TokenizedValue = _tokenizer.Replace(element.Value, null);
         }
     }

src/Orchard.Web/Modules/Orchard.DynamicForms/Drivers/ReCaptchaElementDriver.cs

@@ -42,7 +42,7 @@ namespace Orchard.DynamicForms.Drivers {
             });
         }
 
-        protected override void OnDisplaying(ReCaptcha element, ElementDisplayContext context) {
+        protected override void OnDisplaying(ReCaptcha element, ElementDisplayingContext context) {
             var workContext = _services.WorkContext;
             var currentSite = workContext.CurrentSite;
             var settings = currentSite.As<ReCaptchaSettingsPart>();

src/Orchard.Web/Modules/Orchard.DynamicForms/Drivers/TaxonomyElementDriver.cs

@@ -120,7 +120,7 @@ namespace Orchard.DynamicForms.Drivers {
             });
         }
 
-        protected override void OnDisplaying(Taxonomy element, ElementDisplayContext context) {
+        protected override void OnDisplaying(Taxonomy element, ElementDisplayingContext context) {
             var taxonomyId = element.TaxonomyId;
             var typeName = element.GetType().Name;
             var displayType = context.DisplayType;

src/Orchard.Web/Modules/Orchard.DynamicForms/Drivers/TextAreaElementDriver.cs

@@ -87,7 +87,7 @@ namespace Orchard.DynamicForms.Drivers {
             });
         }
 
-        protected override void OnDisplaying(TextArea element, ElementDisplayContext context) {
+        protected override void OnDisplaying(TextArea element, ElementDisplayingContext context) {
             context.ElementShape.TokenizedValue = _tokenizer.Replace(element.RuntimeValue, null);
         }
     }

src/Orchard.Web/Modules/Orchard.DynamicForms/Drivers/TextFieldElementDriver.cs

@@ -75,7 +75,7 @@ namespace Orchard.DynamicForms.Drivers {
             });
         }
 
-        protected override void OnDisplaying(TextField element, ElementDisplayContext context) {
+        protected override void OnDisplaying(TextField element, ElementDisplayingContext context) {
             context.ElementShape.TokenizedValue = _tokenizer.Replace(element.RuntimeValue, null);
         }
     }

src/Orchard.Web/Modules/Orchard.DynamicForms/Drivers/ValidationElementDriver.cs

@@ -60,7 +60,7 @@
 //            return Editor(context, validatorsEditor);
 //        }
 
-//        protected override void OnDisplaying(FormElement element, ElementDisplayContext context) {
+//        protected override void OnDisplaying(FormElement element, ElementDisplayingContext context) {
 //            if (context.DisplayType == "Design" || element.Form == null)
 //                return;
 

src/Orchard.Web/Modules/Orchard.DynamicForms/Handlers/ClientValidationRegistrationCoordinator.cs

@@ -21,7 +21,7 @@ namespace Orchard.DynamicForms.Handlers {
             }
         }
 
-        void IElementEventHandler.Displaying(ElementDisplayContext context) {
+        void IElementEventHandler.Displaying(ElementDisplayingContext context) {
             if (context.DisplayType == "Design")
                 return;
 
@@ -45,6 +45,7 @@ namespace Orchard.DynamicForms.Handlers {
             context.ElementShape.ClientValidationAttributes = registrationContext.ClientAttributes;
         }
 
+        void IElementEventHandler.Displayed(ElementDisplayedContext context) {}
         void IFormElementEventHandler.GetElementValue(FormElement element, ReadElementValuesContext context) { }
         void IElementEventHandler.Creating(ElementCreatingContext context) {}
         void IElementEventHandler.Created(ElementCreatedContext context) {}

src/Orchard.Web/Modules/Orchard.Layouts/Drivers/ColumnElementDriver.cs

@@ -1,6 +1,13 @@
 using Orchard.Layouts.Elements;
+using Orchard.Layouts.Framework.Display;
 using Orchard.Layouts.Framework.Drivers;
 
 namespace Orchard.Layouts.Drivers {
-    public class ColumnElementDriver : ElementDriver<Column> {}
+    public class ColumnElementDriver : ElementDriver<Column> {
+        protected override void OnDisplaying(Column element, ElementDisplayingContext context) {
+            context.ElementShape.Width = element.Width;
+            context.ElementShape.Offset = element.Offset;
+            context.ElementShape.Collapsed = false;
+        }
+    }
 }

src/Orchard.Web/Modules/Orchard.Layouts/Drivers/ContentItemElementDriver.cs

@@ -37,7 +37,7 @@ namespace Orchard.Layouts.Drivers {
             return Editor(context, editor);
         }
 
-        protected override void OnDisplaying(ContentItem element, ElementDisplayContext context) {
+        protected override void OnDisplaying(ContentItem element, ElementDisplayingContext context) {
             var contentItemIds = context.Content != null ? RemoveCurrentContentItemId(element.ContentItemIds, context.Content.Id) : element.ContentItemIds;
             var displayType = element.DisplayType;
             var contentItems = GetContentItems(contentItemIds).ToArray();

src/Orchard.Web/Modules/Orchard.Layouts/Drivers/ContentPartElementDriver.cs

@@ -19,7 +19,7 @@ namespace Orchard.Layouts.Drivers {
             _transactionManager = transactionManager;
         }
 
-        protected override void OnDisplaying(ContentPart element, ElementDisplayContext context) {
+        protected override void OnDisplaying(ContentPart element, ElementDisplayingContext context) {
             // Content is optional context, so if it's null, we can't render the part element.
             // This typically only happens when the layout editor is used outside the context of
             // a content item and still renders the various content part elements as part of the toolbox.

src/Orchard.Web/Modules/Orchard.Layouts/Drivers/HtmlElementDriver.cs

@@ -27,7 +27,7 @@ namespace Orchard.Layouts.Drivers {
             return Editor(context, editor);
         }
 
-        protected override void OnDisplaying(Html element, ElementDisplayContext context) {
+        protected override void OnDisplaying(Html element, ElementDisplayingContext context) {
             var text = element.Content;
             var flavor = "html";
             var processedText = ApplyHtmlFilters(text, flavor);

src/Orchard.Web/Modules/Orchard.Layouts/Drivers/ImageElementDriver.cs

@@ -33,7 +33,7 @@ namespace Orchard.Layouts.Drivers {
             return Editor(context, editor);
         }
 
-        protected override void OnDisplaying(Image element, ElementDisplayContext context) {
+        protected override void OnDisplaying(Image element, ElementDisplayingContext context) {
             var imageId = element.MediaId;
             var image = imageId != null ? GetImage(imageId.Value) : default(ImagePart);
             context.ElementShape.ImagePart = image;

src/Orchard.Web/Modules/Orchard.Layouts/Drivers/MarkdownElementDriver.cs

@@ -22,7 +22,7 @@ namespace Orchard.Layouts.Drivers {
             return Editor(context, editor);
         }
 
-        protected override void OnDisplaying(MarkdownElement element, ElementDisplayContext context) {
+        protected override void OnDisplaying(MarkdownElement element, ElementDisplayingContext context) {
             context.ElementShape.ProcessedContent = ToHtml(element.Content);
         }
 

src/Orchard.Web/Modules/Orchard.Layouts/Drivers/MediaItemElementDriver.cs

@@ -39,7 +39,7 @@ namespace Orchard.Layouts.Drivers {
             return Editor(context, editor);
         }
 
-        protected override void OnDisplaying(MediaItem element, ElementDisplayContext context) {
+        protected override void OnDisplaying(MediaItem element, ElementDisplayingContext context) {
             var contentItemIds = RemoveCurrentContentItemId(element.MediaItemIds, context.Content.Id);
             var displayType = context.DisplayType != "Design" ? element.DisplayType : "Thumbnail";
             var contentItems = GetContentItems(contentItemIds).ToArray();

src/Orchard.Web/Modules/Orchard.Layouts/Drivers/ParagraphElementDriver.cs

@@ -27,7 +27,7 @@ namespace Orchard.Layouts.Drivers {
             return Editor(context, editor);
         }
 
-        protected override void OnDisplaying(Paragraph element, ElementDisplayContext context) {
+        protected override void OnDisplaying(Paragraph element, ElementDisplayingContext context) {
             var text = element.Content;
             var flavor = "html";
             var processedText = ApplyHtmlFilters(text, flavor);

src/Orchard.Web/Modules/Orchard.Layouts/Drivers/ProjectionElementDriver.cs

@@ -53,7 +53,7 @@ namespace Orchard.Layouts.Drivers {
             }
         }
 
-        protected override void OnDisplaying(Projection element, ElementDisplayContext context) {
+        protected override void OnDisplaying(Projection element, ElementDisplayingContext context) {
             var queryId = element.QueryId;
             var layoutId = element.LayoutId;
 

src/Orchard.Web/Modules/Orchard.Layouts/Drivers/RowElementDriver.cs

@@ -1,7 +1,52 @@
-using Orchard.Layouts.Elements;
+using System.Collections.Generic;
+using System.Linq;
+using Orchard.Layouts.Elements;
+using Orchard.Layouts.Framework.Display;
 using Orchard.Layouts.Framework.Drivers;
 
 namespace Orchard.Layouts.Drivers {
     public class RowElementDriver : ElementDriver<Row> {
+        protected override void OnDisplaying(Row element, ElementDisplayingContext context) {
+            context.ElementShape.Collapsed = false;
+        }
+
+        protected override void OnDisplayed(Row element, ElementDisplayedContext context) {
+            var columnShapes = ((IEnumerable<dynamic>)context.ElementShape.Items).ToList();
+            var columnIndex = 0;
+
+            foreach (var columnShape in columnShapes) {
+                var column = (Column)columnShape.Element;
+
+                if (column.Collapsible == true && IsEmpty(columnShape)) {
+                    columnShape.Collapsed = true;
+
+                    var sibling = GetNonCollapsedSibling(columnShapes, columnIndex);
+                    if (sibling != null) {
+                        // Increase the width of the sibling by the width of the current column.
+                        sibling.Width += columnShape.Width;
+                        //sibling.Width += GetAvailableWidth(columnShapes.Skip(columnIndex));
+                    }
+                    else {
+                        // The row has only one column, which is collapsed, so we hide the row entirely.
+                        context.ElementShape.Collapsed = true;
+                    } 
+                }
+
+                ++columnIndex;
+            }
+        }
+
+        private dynamic GetNonCollapsedSibling(IList<dynamic> columnShapes, int index) {
+            var siblings = index == 0 ? columnShapes : columnShapes.Reverse();
+            return siblings.FirstOrDefault(x => x.Collapsed == false);
+        }
+
+        private int GetAvailableWidth(IEnumerable<dynamic> columnShapes) {
+            return columnShapes.Where(x => IsEmpty(x)).Sum(x => (int) x.Width);
+        }
+
+        private static bool IsEmpty(dynamic shape) {
+            return shape.Items.Count == 0;
+        }
     }
 }

src/Orchard.Web/Modules/Orchard.Layouts/Drivers/ShapeElementDriver.cs

@@ -19,7 +19,7 @@ namespace Orchard.Layouts.Drivers {
             get { yield return "ShapeElement"; }
         }
 
-        protected override void OnDisplaying(Shape element, ElementDisplayContext context) {
+        protected override void OnDisplaying(Shape element, ElementDisplayingContext context) {
             if (String.IsNullOrWhiteSpace(element.ShapeType))
                 return;
 

src/Orchard.Web/Modules/Orchard.Layouts/Drivers/TextElementDriver.cs

@@ -27,7 +27,7 @@ namespace Orchard.Layouts.Drivers {
             return Editor(context, editor);
         }
 
-        protected override void OnDisplaying(Text element, ElementDisplayContext context) {
+        protected override void OnDisplaying(Text element, ElementDisplayingContext context) {
             var text = element.Content;
             var flavor = "textarea";
             var processedText = ApplyHtmlFilters(text, flavor);

src/Orchard.Web/Modules/Orchard.Layouts/Drivers/VectorImageElementDriver.cs

@@ -37,7 +37,7 @@ namespace Orchard.Layouts.Drivers {
             return Editor(context, editor);
         }
 
-        protected override void OnDisplaying(VectorImage element, ElementDisplayContext context) {
+        protected override void OnDisplaying(VectorImage element, ElementDisplayingContext context) {
             var mediaId = element.MediaId;
             var vectorImage = mediaId != null ? GetVectorImage(mediaId.Value) : default(VectorImagePart);
             context.ElementShape.VectorImagePart = vectorImage;

src/Orchard.Web/Modules/Orchard.Layouts/Framework/Display/ElementDisplay.cs

@@ -25,9 +25,7 @@ namespace Orchard.Layouts.Framework.Display {
             Element element,
             IContent content,
             string displayType = null,
-            IUpdateModel updater = null,
+            IUpdateModel updater = null) {
-            string renderEventName = null,
-            string renderEventArgs = null) {
 
             var createShapeContext = new ElementCreatingDisplayShapeContext {
                 Element = element,
@@ -39,7 +37,7 @@ namespace Orchard.Layouts.Framework.Display {
 
             var typeName = element.GetType().Name;
             var category = element.Category.ToSafeName();
-            var drivers = element.Descriptor.GetDrivers();
+            var drivers = element.Descriptor.GetDrivers().ToList();
             var elementShapeArguments = CreateArguments(element, content);
             var elementShape = (dynamic)_shapeFactory.Create("Element", elementShapeArguments, () => new ZoneHolding(() => _shapeFactory.Create("ElementZone")));
 
@@ -49,19 +47,19 @@ namespace Orchard.Layouts.Framework.Display {
             elementShape.Metadata.Alternates.Add(String.Format("Elements_{0}__{1}", typeName, category));
             elementShape.Metadata.Alternates.Add(String.Format("Elements_{0}_{1}__{2}", typeName, displayType, category));
 
-            var displayContext = new ElementDisplayContext {
+            var displayingContext = new ElementDisplayingContext {
                 Element = element,
                 ElementShape = elementShape,
                 DisplayType = displayType,
                 Content = content,
-                Updater = updater,
+                Updater = updater
-                RenderEventName = renderEventName,
-                RenderEventArgs = renderEventArgs
             };
 
-            _elementEventHandlerHandler.Displaying(displayContext);
+            _elementEventHandlerHandler.Displaying(displayingContext);
-            InvokeDrivers(drivers, driver => driver.Displaying(displayContext));
+            InvokeDrivers(drivers, driver => driver.Displaying(displayingContext));
-            element.Descriptor.Display(displayContext);
+
+            if (element.Descriptor.Displaying != null)
+                element.Descriptor.Displaying(displayingContext);
 
             var container = element as Container;
 
@@ -75,14 +73,28 @@ namespace Orchard.Layouts.Framework.Display {
                 }
             }
 
+            var displayedContext = new ElementDisplayedContext {
+                Element = element,
+                ElementShape = elementShape,
+                DisplayType = displayType,
+                Content = content,
+                Updater = updater
+            };
+
+            _elementEventHandlerHandler.Displayed(displayedContext);
+            InvokeDrivers(drivers, driver => driver.Displayed(displayedContext));
+
+            if (element.Descriptor.Displayed != null)
+                element.Descriptor.Displayed(displayedContext);
+
             return elementShape;
         }
 
-        public dynamic DisplayElements(IEnumerable<Element> elements, IContent content, string displayType = null, IUpdateModel updater = null, string renderEventName = null, string renderEventArgs = null) {
+        public dynamic DisplayElements(IEnumerable<Element> elements, IContent content, string displayType = null, IUpdateModel updater = null) {
             var layoutRoot = (dynamic)_shapeFactory.Create("LayoutRoot");
 
             foreach (var element in elements) {
-                var elementShape = DisplayElement(element, content, displayType, updater, renderEventName, renderEventArgs);
+                var elementShape = DisplayElement(element, content, displayType, updater);
                 layoutRoot.Add(elementShape);
             }
 

src/Orchard.Web/Modules/Orchard.Layouts/Framework/Display/ElementDisplayedContext.cs

@@ -2,13 +2,11 @@ using Orchard.ContentManagement;
 using Orchard.Layouts.Framework.Elements;
 
 namespace Orchard.Layouts.Framework.Display {
-    public class ElementDisplayContext {
+    public class ElementDisplayedContext {
         public IContent Content { get; set; }
         public Element Element { get; set; }
         public string DisplayType { get; set; }
         public dynamic ElementShape { get; set; }
         public IUpdateModel Updater { get; set; }
-        public string RenderEventName { get; set; }
-        public string RenderEventArgs { get; set; }
     }
 }

src/Orchard.Web/Modules/Orchard.Layouts/Framework/Display/ElementDisplayingContext.cs

@@ -0,0 +1,12 @@
+using Orchard.ContentManagement;
+using Orchard.Layouts.Framework.Elements;
+
+namespace Orchard.Layouts.Framework.Display {
+    public class ElementDisplayingContext {
+        public IContent Content { get; set; }
+        public Element Element { get; set; }
+        public string DisplayType { get; set; }
+        public dynamic ElementShape { get; set; }
+        public IUpdateModel Updater { get; set; }
+    }
+}

src/Orchard.Web/Modules/Orchard.Layouts/Framework/Display/IElementDisplay.cs

@@ -4,7 +4,7 @@ using Orchard.Layouts.Framework.Elements;
 
 namespace Orchard.Layouts.Framework.Display {
     public interface IElementDisplay : IDependency {
-        dynamic DisplayElement(Element element, IContent content, string displayType = null, IUpdateModel updater = null, string renderEventName = null, string renderEventArgs = null);
+        dynamic DisplayElement(Element element, IContent content, string displayType = null, IUpdateModel updater = null);
-        dynamic DisplayElements(IEnumerable<Element> elements, IContent content, string displayType = null, IUpdateModel updater = null, string renderEventName = null, string renderEventArgs = null);
+        dynamic DisplayElements(IEnumerable<Element> elements, IContent content, string displayType = null, IUpdateModel updater = null);
     }
 }

src/Orchard.Web/Modules/Orchard.Layouts/Framework/Drivers/ElementDriver.cs

@@ -17,10 +17,14 @@ namespace Orchard.Layouts.Framework.Drivers {
             return OnUpdateEditor((TElement)context.Element, context);
         }
 
-        public void Displaying(ElementDisplayContext context) {
+        public void Displaying(ElementDisplayingContext context) {
             OnDisplaying((TElement) context.Element, context);
         }
 
+        public void Displayed(ElementDisplayedContext context) {
+            OnDisplayed((TElement)context.Element, context);
+        }
+
         public void LayoutSaving(ElementSavingContext context) {
             OnLayoutSaving((TElement) context.Element, context);
         }
@@ -45,7 +49,10 @@ namespace Orchard.Layouts.Framework.Drivers {
             return OnBuildEditor(element, context);
         }
 
-        protected virtual void OnDisplaying(TElement element, ElementDisplayContext context) {
+        protected virtual void OnDisplaying(TElement element, ElementDisplayingContext context) {
+        }
+
+        protected virtual void OnDisplayed(TElement element, ElementDisplayedContext context) {
         }
 
         protected virtual void OnLayoutSaving(TElement element, ElementSavingContext context) {

src/Orchard.Web/Modules/Orchard.Layouts/Framework/Drivers/IElementDriver.cs

@@ -6,7 +6,8 @@ namespace Orchard.Layouts.Framework.Drivers {
         int Priority { get; }
         EditorResult BuildEditor(ElementEditorContext context);
         EditorResult UpdateEditor(ElementEditorContext context);
-        void Displaying(ElementDisplayContext context);
+        void Displaying(ElementDisplayingContext context);
+        void Displayed(ElementDisplayedContext context);
         void LayoutSaving(ElementSavingContext context);
         void Removing(ElementRemovingContext context);
         void Exporting(ExportElementContext context);

src/Orchard.Web/Modules/Orchard.Layouts/Framework/Elements/ElementDescriptor.cs

@@ -15,7 +15,7 @@ namespace Orchard.Layouts.Framework.Elements {
             Category = category;
             GetDrivers = Enumerable.Empty<IElementDriver>;
             CreatingDisplay = context => { };
-            Display = context => {};
+            Displaying = context => {};
             Editor = context => { };
             UpdateEditor = context => { };
             StateBag = new Dictionary<string, object>();
@@ -29,7 +29,8 @@ namespace Orchard.Layouts.Framework.Elements {
         public string TypeName { get; set; }
         public Func<IEnumerable<IElementDriver>> GetDrivers { get; set; }
         public Action<ElementCreatingDisplayShapeContext> CreatingDisplay { get; set; }
-        public Action<ElementDisplayContext> Display { get; set; }
+        public Action<ElementDisplayingContext> Displaying { get; set; }
+        public Action<ElementDisplayedContext> Displayed { get; set; }
         public Action<ElementEditorContext> Editor { get; set; }
         public Action<ElementEditorContext> UpdateEditor { get; set; }
         public bool IsSystemElement { get; set; }

src/Orchard.Web/Modules/Orchard.Layouts/Orchard.Layouts.csproj

@@ -424,6 +424,7 @@
     <Compile Include="Elements\ContentElement.cs" />
     <Compile Include="Elements\Shape.cs" />
     <Compile Include="Filters\TokensFilter.cs" />
+    <Compile Include="Framework\Display\ElementDisplayedContext.cs" />
     <Compile Include="Framework\Drivers\ImportContentContextWrapper.cs" />
     <Compile Include="Framework\Drivers\IContentImportSession.cs" />
     <Compile Include="Framework\Drivers\ExportElementContext.cs" />
@@ -560,7 +561,7 @@
     <Compile Include="Services\ILayoutSerializer.cs" />
     <Compile Include="Helpers\ElementDataHelper.cs" />
     <Compile Include="Models\ElementInstance.cs" />
-    <Compile Include="Framework\Display\ElementDisplayContext.cs" />
+    <Compile Include="Framework\Display\ElementDisplayingContext.cs" />
     <Compile Include="Elements\Column.cs" />
     <Compile Include="Services\LayoutSerializer.cs" />
     <Compile Include="Providers\SnippetElementHarvester.cs" />

src/Orchard.Web/Modules/Orchard.Layouts/Providers/BlueprintElementHarvester.cs

@@ -41,7 +41,7 @@ namespace Orchard.Layouts.Providers {
                         EnableEditorDialog = false,
                         IsSystemElement = false,
                         CreatingDisplay = creatingDisplayContext => CreatingDisplay(creatingDisplayContext, blueprint),
-                        Display = displayContext => Displaying(displayContext, baseElement),
+                        Displaying = displayContext => Displaying(displayContext, baseElement),
                         StateBag = new Dictionary<string, object> {
                             {"Blueprint", true},
                             {"ElementTypeName", baseElement.Descriptor.TypeName}
@@ -62,7 +62,7 @@ namespace Orchard.Layouts.Providers {
             context.Element.Data = bluePrintState;
         }
 
-        private void Displaying(ElementDisplayContext context, Element element) {
+        private void Displaying(ElementDisplayingContext context, Element element) {
             var drivers = _elementManager.Value.GetDrivers(element);
 
             foreach (var driver in drivers) {

src/Orchard.Web/Modules/Orchard.Layouts/Providers/ContentFieldElementHarvester.cs

@@ -45,7 +45,7 @@ namespace Orchard.Layouts.Providers {
                 var name = String.Format("{0}.{1}", part.Name, field.Name);
                 var displayName = field.DisplayName;
                 yield return new ElementDescriptor(elementType, name, T(displayName), T(field.DisplayName), contentFieldElement.Category) {
-                    Display = displayContext => Displaying(displayContext),
+                    Displaying = displayContext => Displaying(displayContext),
                     ToolboxIcon = "\uf1b2"
                 };
             }
@@ -68,7 +68,7 @@ namespace Orchard.Layouts.Providers {
             return fields.Where(t => blackList.All(x => t.Item2.FieldDefinition.Name != x));
         }
 
-        private void Displaying(ElementDisplayContext context) {
+        private void Displaying(ElementDisplayingContext context) {
             var contentItem = context.Content.ContentItem;
             var typeName = context.Element.Descriptor.TypeName;
             var contentField = contentItem.GetContentField(typeName);

src/Orchard.Web/Modules/Orchard.Layouts/Providers/ContentPartElementHarvester.cs

@@ -39,7 +39,7 @@ namespace Orchard.Layouts.Providers {
                 var partDescription = partSettings != null ? partSettings.Description : null;
                 var description = T(!String.IsNullOrWhiteSpace(partDescription) ? partDescription : contentPart.Name);
                 return new ElementDescriptor(elementType, contentPart.Name, T(contentPart.Name.CamelFriendly()), description, contentPartElement.Category) {
-                    Display = displayContext => Displaying(displayContext),
+                    Displaying = displayContext => Displaying(displayContext),
                     ToolboxIcon = "\uf1b2",
                     StateBag = new Dictionary<string, object> {
                         {"ElementTypeName", contentPart.Name}
@@ -60,7 +60,7 @@ namespace Orchard.Layouts.Providers {
             return parts.Where(p => p.Settings.GetModel<ContentPartLayoutSettings>().Placable);
         }
 
-        private void Displaying(ElementDisplayContext context) {
+        private void Displaying(ElementDisplayingContext context) {
             var drivers = _elementManager.Value.GetDrivers(context.Element);
 
             foreach (var driver in drivers) {

src/Orchard.Web/Modules/Orchard.Layouts/Providers/SnippetElementHarvester.cs

@@ -49,13 +49,13 @@ namespace Orchard.Layouts.Providers {
                 var elementName = GetDisplayName(shapeDescriptor.Value.BindingSource);
                 var closureDescriptor = shapeDescriptor;
                 yield return new ElementDescriptor(elementType, shapeType, T(elementName), T("An element that renders the {0} shape.", shapeType), snippetElement.Category) {
-                    Display = displayContext => Displaying(displayContext, closureDescriptor.Value),
+                    Displaying = displayContext => Displaying(displayContext, closureDescriptor.Value),
                     ToolboxIcon = "\uf10c"
                 };
             }
         }
 
-        private void Displaying(ElementDisplayContext context, ShapeDescriptor shapeDescriptor) {
+        private void Displaying(ElementDisplayingContext context, ShapeDescriptor shapeDescriptor) {
             var shapeType = shapeDescriptor.ShapeType;
             var shape = _shapeFactory.Value.Create(shapeType);
             context.ElementShape.Snippet = shape;

src/Orchard.Web/Modules/Orchard.Layouts/Services/ElementEventHandlerBase.cs

@@ -5,7 +5,8 @@ namespace Orchard.Layouts.Services {
     public abstract class ElementEventHandlerBase : Component, IElementEventHandler {
         public virtual void Creating(ElementCreatingContext context) { }
         public virtual void Created(ElementCreatedContext context) { }
-        public virtual void Displaying(ElementDisplayContext context) { }
+        public virtual void Displaying(ElementDisplayingContext context) { }
+        public virtual void Displayed(ElementDisplayedContext context) { }
         public virtual void BuildEditor(ElementEditorContext context) { }
         public virtual void UpdateEditor(ElementEditorContext context) { }
     }

src/Orchard.Web/Modules/Orchard.Layouts/Services/IElementEventHandler.cs

@@ -6,7 +6,8 @@ namespace Orchard.Layouts.Services {
     public interface IElementEventHandler : IEventHandler {
         void Creating(ElementCreatingContext context);
         void Created(ElementCreatedContext context);
-        void Displaying(ElementDisplayContext context);
+        void Displaying(ElementDisplayingContext context);
+        void Displayed(ElementDisplayedContext context);
         void BuildEditor(ElementEditorContext context);
         void UpdateEditor(ElementEditorContext context);
     }

src/Orchard.Web/Modules/Orchard.Layouts/Views/Elements/Column.cshtml

@@ -1,10 +1,8 @@
 @using Orchard.DisplayManagement.Shapes
-@using Orchard.Layouts.Elements
 @using Orchard.Layouts.Helpers
 @{
-    var element = (Column) Model.Element;
+    var columnSpan = (int?)Model.Width;
-    var columnSpan = element.Width;
+    var columnOffset = (int?)Model.Offset;
-    var columnOffset = element.Offset;
     var columnOffsetCss = columnOffset > 0 ? "offset-" + columnOffset : default(string);
     var tagBuilder = TagBuilderExtensions.AddCommonElementAttributes(new OrchardTagBuilder("div"), Model);
     
@@ -12,6 +10,8 @@
     tagBuilder.AddCssClass(String.Concat("span-", columnSpan));
     tagBuilder.AddCssClass(columnOffsetCss);
 }
-@tagBuilder.StartElement
+@if (!Model.Collapsed) {
-@DisplayChildren(Model)
+    @tagBuilder.StartElement
-@tagBuilder.EndElement
+    @DisplayChildren(Model)
+    @tagBuilder.EndElement
+}

src/Orchard.Web/Modules/Orchard.Layouts/Views/Elements/Row.cshtml

@@ -4,6 +4,8 @@
     var tagBuilder = TagBuilderExtensions.AddCommonElementAttributes(new OrchardTagBuilder("div"), Model);
     tagBuilder.AddCssClass("row");
 }
-@tagBuilder.StartElement
+@if (!Model.Collapsed) {
-@DisplayChildren(Model)
+    @tagBuilder.StartElement
-@tagBuilder.EndElement
+    @DisplayChildren(Model)
+    @tagBuilder.EndElement
+}

src/Orchard.Web/Modules/Orchard.Widgets/Drivers/ColumnElementDriver.cs

@@ -23,7 +23,11 @@ namespace Orchard.Widgets.Drivers {
             _widgetsService = widgetsService;
         }
 
-        protected override void OnDisplaying(Column element, ElementDisplayContext context) {
+        protected override void OnDisplaying(Column element, ElementDisplayingContext context) {
+            RenderWidgets(element, context);
+        }
+
+        private void RenderWidgets(Column element, ElementDisplayingContext context) {
             var zoneName = element.ZoneName;
 
             if (String.IsNullOrWhiteSpace(zoneName))