C:/Private/OSS/n2cms/github/n2cms/src/Framework/Extensions/Web/Mvc/Html/DroppableZoneHelper.cs

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using System;
using N2.Engine;
using N2.Web.UI;
using N2.Web.UI.WebControls;
using System.Web.Mvc;
using System.Text;
using System.IO;
using N2.Definitions;
using N2.Persistence;

namespace N2.Web.Mvc.Html
{
    internal static class TextWriterExtensions
    {
        public static TextWriter WriteAttribute(this TextWriter writer, string attributeName, string value)
        {
            writer.Write(" {0}=\"{1}\"", attributeName, value);
            return writer;
        }
    }

        public class DroppableZoneHelper : ZoneHelper
        {
                protected string ZoneTitle { get; set; }

        ControlPanelState state = ControlPanelState.Hidden;

        public DroppableZoneHelper(HtmlHelper helper, string zoneName, ContentItem currentItem)
            : base(helper, zoneName, currentItem)
                {
            state = helper.ViewContext.HttpContext.ControlPanelState();
        }

                public ZoneHelper Title(string title)
                {
                        ZoneTitle = title;

                        return this;
                }

        public override void Render(TextWriter writer)
        {
                        if (state == ControlPanelState.DragDrop)
                        {
                                if (ZoneName.IndexOfAny(new[] { '.', ',', ' ', '\'', '"', '\t', '\r', '\n' }) >= 0) throw new N2Exception("Zone '" + ZoneName + "' contains illegal characters.");

                                writer.Write("<div class='" + ZoneName + " dropZone'");
                                writer.WriteAttribute(PartUtilities.PathAttribute, CurrentItem.Path)
                                        .WriteAttribute(PartUtilities.ZoneAttribute, ZoneName)
                                        .WriteAttribute(PartUtilities.AllowedAttribute, PartUtilities.GetAllowedNames(ZoneName, PartsAdapter.GetAllowedDefinitions(CurrentItem, ZoneName, Html.ViewContext.HttpContext.User)))
                                        .WriteAttribute("title", ZoneTitle ?? DroppableZone.GetToolTip(Html.ResolveService<IDefinitionManager>().GetDefinition(CurrentItem.GetContentType()), ZoneName))
                                        .Write(">");

                                if (string.IsNullOrEmpty(Html.ViewContext.HttpContext.Request["preview"]))
                                {
                                        base.Render(writer);
                                }
                                else
                                {
                                        string preview = Html.ViewContext.HttpContext.Request["preview"];
                                        RenderReplacingPreviewed(writer, preview);
                                }
                                
                                writer.Write("</div>");
                        }
                        else
                                base.Render(writer);
                }

                protected void RenderReplacingPreviewed(TextWriter writer, string preview)
                {
                        int itemID;
                        if (int.TryParse(preview, out itemID))
                        {
                                ContentItem previewedItem = Html.ResolveService<IPersister>().Get(itemID);
                                if (previewedItem != null && previewedItem.VersionOf != null)
                                {
                                        foreach (var child in PartsAdapter.GetItemsInZone(CurrentItem, ZoneName))
                                        {
                                                if (previewedItem.VersionOf == child)
                                                        RenderTemplate(writer, previewedItem);
                                                else
                                                        RenderTemplate(writer, child);
                                        }
                                }
                        }
                }

        protected override void RenderTemplate(TextWriter writer, ContentItem model)
        {                       
            if (state == ControlPanelState.DragDrop)
            {
                                ItemDefinition definition = Html.ResolveService<IDefinitionManager>().GetDefinition(model.GetContentType());

                writer.Write("<div class='" + definition.Discriminator + " zoneItem'");
                writer.WriteAttribute(PartUtilities.PathAttribute, model.Path)
                    .WriteAttribute(PartUtilities.TypeAttribute, definition.Discriminator)
                    .Write(">");

                                Html.ResolveService<PartUtilities>().WriteTitleBar(writer, model, Html.ViewContext.HttpContext.Request.RawUrl);
                
                base.RenderTemplate(writer, model);

                writer.Write("</div>");
            }
            else
                base.RenderTemplate(writer, model);
        }

        public DroppableZoneHelper AllowExternalManipulation()
        {
            // TODO: Not implemented
            return this;
        }
        }
}