Orchard/src/Orchard.Web/Core/Containers/Drivers/ContainerPartDriver.cs

using Orchard.ContentManagement;
using Orchard.ContentManagement.Drivers;
using Orchard.ContentManagement.Handlers;
using Orchard.Core.Containers.Models;
using Orchard.Data;

namespace Orchard.Core.Containers.Drivers {
    public class ContainerPartDriver : ContentPartDriver<ContainerPart> {
        protected override DriverResult Editor(ContainerPart part, dynamic shapeHelper) {
            return Editor(part, null, shapeHelper);
        }
        protected override DriverResult Editor(ContainerPart part, ContentManagement.IUpdateModel updater, dynamic shapeHelper) {
            return ContentShape(
                "Parts_Container_Edit",
                () => {
                    if (updater != null)
                        updater.TryUpdateModel(part, "Container", null, null);

                    return shapeHelper.EditorTemplate(TemplateName: "Container", Model: part, Prefix: "Container");
                });
        }
    }

    public class ContainerPartHandler : ContentHandler {
        public ContainerPartHandler(IRepository<ContainerPartRecord> repository, IOrchardServices orchardServices) {
            Filters.Add(StorageFilter.For(repository));
            OnInitializing<ContainerPart>((context, part) => {
                var containerSiteSettings = orchardServices.WorkContext.CurrentSite.As<ContainerSettingsPart>().Record;
                part.Record.PageSize = containerSiteSettings.DefaultPageSize;
            });
        }
    }
}