Remove abandoned sidebar footer

World Manager for Minecraft/ContentView.swift

@@ -45,7 +45,6 @@ struct ContentView: View {
                 sources: library.sidebarSources,
                 connectedDevices: library.connectedDevices,
                 selection: $selectedSidebarSelection,
-                footerState: library.sidebarFooterState,
                 addSourceAction: pickFolder,
                 addDeviceSourceAction: { isShowingDeviceSourceSheet = true },
                 addConnectedDeviceAction: addConnectedDeviceSource(from:),
@@ -57,7 +56,6 @@ struct ContentView: View {
                 removeSourceAction: { source in
                     removeSource(source.id)
                 },
-                revealFooterURLAction: revealURLInFinder(_:),
                 filters: sidebarFilters(for:)
             )
             .navigationSplitViewColumnWidth(min: 280, ideal: 320, max: 380)
@@ -681,7 +679,6 @@ struct ContentView: View {
         }
 
         isPerformingItemAction = true
-        library.setItemActionInProgress("Creating \(item.contentType.archiveExtension) file...")
 
         Task {
             do {
@@ -695,16 +692,11 @@ struct ContentView: View {
 
                 await MainActor.run {
                     isPerformingItemAction = false
-                    library.setItemActionSuccess(
+                    _ = finalURL
-                        title: "Created \(finalURL.lastPathComponent)",
-                        subtitle: "Ready to move to another device",
-                        revealURL: finalURL
-                    )
                 }
             } catch {
                 await MainActor.run {
                     isPerformingItemAction = false
-                    library.setItemActionFailure(error.localizedDescription)
                 }
             }
         }
@@ -717,7 +709,6 @@ struct ContentView: View {
         let source = currentSource
 
         isPerformingItemAction = true
-        library.setItemActionInProgress("Preparing \(item.contentType.archiveExtension) file...")
 
         Task {
             do {
@@ -733,16 +724,9 @@ struct ContentView: View {
 
                     let presentationView = anchorView ?? NSApp.keyWindow?.contentView
                     guard let presentationView else {
-                        library.setItemActionFailure("Could not present the share menu.")
                         return
                     }
 
-                    library.setItemActionSuccess(
-                        title: "Share ready",
-                        subtitle: shareURL.lastPathComponent,
-                        revealURL: shareURL
-                    )
-
                     let picker = NSSharingServicePicker(items: [shareURL])
                     let targetRect = anchorView?.bounds ?? presentationView.bounds.insetBy(
                         dx: presentationView.bounds.width / 2,
@@ -753,7 +737,6 @@ struct ContentView: View {
             } catch {
                 await MainActor.run {
                     isPerformingItemAction = false
-                    library.setItemActionFailure(error.localizedDescription)
                 }
             }
         }
@@ -774,7 +757,6 @@ struct ContentView: View {
         }
 
         isPerformingItemAction = true
-        library.setItemActionInProgress("Preparing item for Finder...")
 
         Task {
             do {
@@ -783,25 +765,15 @@ struct ContentView: View {
                 await MainActor.run {
                     isPerformingItemAction = false
                     NSWorkspace.shared.activateFileViewerSelecting([revealURL])
-                    library.setItemActionSuccess(
-                        title: "Prepared for Finder",
-                        subtitle: item.displayName,
-                        revealURL: revealURL
-                    )
                 }
             } catch {
                 await MainActor.run {
                     isPerformingItemAction = false
-                    library.setItemActionFailure(error.localizedDescription)
                 }
             }
         }
     }
 
-    private func revealURLInFinder(_ url: URL) {
-        NSWorkspace.shared.activateFileViewerSelecting([url])
-    }
-
     private func archiveType(for item: MinecraftContentItem) -> UTType {
         UTType(filenameExtension: item.contentType.archiveExtension) ?? .data
     }

World Manager for Minecraft/PreviewFixtures.swift

@@ -227,14 +227,6 @@ enum PreviewFixtures {
 
     static let allSources = [primarySource, secondarySource]
 
-    static let sidebarFooter = SidebarFooterState(
-        style: .success,
-        title: "Export Complete",
-        subtitle: "Saved a preview copy of \(featuredWorld.displayName)",
-        detail: nil,
-        revealURL: featuredWorld.folderURL
-    )
-
     static let directoryEntries = [
         DirectoryPreviewEntry(name: "db", isDirectory: true),
         DirectoryPreviewEntry(name: "level.dat", isDirectory: false),
@@ -242,48 +234,9 @@ enum PreviewFixtures {
         DirectoryPreviewEntry(name: "world_icon.jpeg", isDirectory: false),
         DirectoryPreviewEntry(name: "resource_packs", isDirectory: true)
     ]
-
-    nonisolated static func sidebarFilters(for source: MinecraftSource) -> [SidebarFilter] {
-        let allFilter = SidebarFilter(
-            title: "All Content",
-            iconName: "square.stack.3d.up",
-            count: source.items.count,
-            selection: .allContent(sourceID: source.id)
-        )
-
-        let groupedFilters = MinecraftContentType.allCases.compactMap { contentType -> SidebarFilter? in
-            let count = source.items.filter { $0.contentType == contentType }.count
-            guard count > 0 else {
-                return nil
-            }
-
-            return SidebarFilter(
-                title: contentType.rawValue,
-                iconName: iconName(for: contentType),
-                count: count,
-                selection: .contentType(sourceID: source.id, contentType: contentType)
-            )
-        }
-
-        return [allFilter] + groupedFilters
-    }
-
-    nonisolated static func iconName(for contentType: MinecraftContentType) -> String {
-        switch contentType {
-        case .world:
-            return "globe.europe.africa"
-        case .behaviorPack:
-            return "shippingbox"
-        case .resourcePack:
-            return "paintpalette"
-        case .skinPack:
-            return "person.crop.square"
-        case .worldTemplate:
-            return "doc.on.doc"
-        }
-    }
 }
 
+@MainActor
 struct SidebarColumnPreviewContainer: View {
     @State private var selection: SidebarSelection? = .allContent(sourceID: PreviewFixtures.primarySource.id)
 
@@ -293,14 +246,49 @@ struct SidebarColumnPreviewContainer: View {
                 sources: PreviewFixtures.allSources,
                 connectedDevices: [],
                 selection: $selection,
-                footerState: PreviewFixtures.sidebarFooter,
                 addSourceAction: {},
                 addDeviceSourceAction: {},
                 addConnectedDeviceAction: { _ in },
                 rescanSourceAction: { _ in },
                 removeSourceAction: { _ in },
-                revealFooterURLAction: { _ in },
+                filters: { source in
-                filters: PreviewFixtures.sidebarFilters(for:)
+                    let allFilter = SidebarFilter(
+                        title: "All Content",
+                        iconName: "square.stack.3d.up",
+                        count: source.displayItems.count,
+                        selection: .allContent(sourceID: source.id)
+                    )
+
+                    let groupedFilters = MinecraftContentType.allCases.compactMap { contentType -> SidebarFilter? in
+                        let count = source.displayItems.filter { $0.contentType == contentType }.count
+                        guard count > 0 else {
+                            return nil
+                        }
+
+                        let iconName: String
+                        switch contentType {
+                        case .world:
+                            iconName = "globe.europe.africa"
+                        case .behaviorPack:
+                            iconName = "shippingbox"
+                        case .resourcePack:
+                            iconName = "paintpalette"
+                        case .skinPack:
+                            iconName = "person.crop.square"
+                        case .worldTemplate:
+                            iconName = "doc.on.doc"
+                        }
+
+                        return SidebarFilter(
+                            title: contentType.rawValue,
+                            iconName: iconName,
+                            count: count,
+                            selection: .contentType(sourceID: source.id, contentType: contentType)
+                        )
+                    }
+
+                    return [allFilter] + groupedFilters
+                }
             )
         }
     }

World Manager for Minecraft/Services/SourceLibrary.swift

@@ -9,21 +9,6 @@ import Combine
 import Foundation
 import OSLog
 
-struct SidebarFooterState {
-    enum Style {
-        case idle
-        case inProgress
-        case failure
-        case success
-    }
-
-    let style: Style
-    let title: String
-    let subtitle: String?
-    let detail: String?
-    let revealURL: URL?
-}
-
 struct ConnectedDeviceSidebarEntry: Identifiable, Hashable {
     let device: ConnectedDevice
     let containers: [DeviceAppContainer]
@@ -58,7 +43,6 @@ final class SourceLibrary: ObservableObject {
     private static let localSourceRefreshInterval: TimeInterval = 4.0
     private static let connectedDeviceRefreshInterval: TimeInterval = 2.0
     private static let connectedDeviceRefreshIntervalWhileScanning: TimeInterval = 5.0
-    private static let footerRefreshDebounce: TimeInterval = 0.15
     private static let usbConnectedDeviceAutoRefreshInterval: TimeInterval = 45.0
     private static let networkConnectedDeviceAutoRefreshInterval: TimeInterval = 120.0
     private static let usbConnectedDeviceDiscoveryCacheTTL: TimeInterval = 60.0
@@ -70,21 +54,12 @@ final class SourceLibrary: ObservableObject {
 
     @Published var sources: [MinecraftSource] = []
     @Published private(set) var connectedDevices: [ConnectedDeviceSidebarEntry] = []
-    @Published private(set) var sidebarFooterState = SidebarFooterState(
-        style: .idle,
-        title: "",
-        subtitle: nil,
-        detail: nil,
-        revealURL: nil
-    )
     @Published private(set) var isRestoringPersistedSources = true
 
     private var scanTasks: [URL: Task<Void, Never>] = [:]
     private var automaticSyncTasks: [URL: Task<Void, Never>] = [:]
     private var connectedDeviceRefreshTask: Task<Void, Never>?
     private var localSourceRefreshTask: Task<Void, Never>?
-    private var footerResetTask: Task<Void, Never>?
-    private var footerRefreshTask: Task<Void, Never>?
     private let persistenceStore: SourcePersistenceStore
     private let sourceAccessMethod: SourceAccessMethod
     private let connectedDeviceAccessMethod: ConnectedDeviceSourceAccessMethod?
@@ -123,8 +98,6 @@ final class SourceLibrary: ObservableObject {
     deinit {
         connectedDeviceRefreshTask?.cancel()
         localSourceRefreshTask?.cancel()
-        footerResetTask?.cancel()
-        footerRefreshTask?.cancel()
         automaticSyncTasks.values.forEach { $0.cancel() }
         scanTasks.values.forEach { $0.cancel() }
     }
@@ -147,10 +120,6 @@ final class SourceLibrary: ObservableObject {
         connectedDeviceRefreshTask = nil
         localSourceRefreshTask?.cancel()
         localSourceRefreshTask = nil
-        footerResetTask?.cancel()
-        footerResetTask = nil
-        footerRefreshTask?.cancel()
-        footerRefreshTask = nil
 
         for task in automaticSyncTasks.values {
             task.cancel()
@@ -257,53 +226,6 @@ final class SourceLibrary: ObservableObject {
         if let removedSource {
             purgeCachedArtifacts(for: removedSource)
         }
-        refreshSidebarFooterState()
-    }
-
-    func setItemActionInProgress(_ description: String) {
-        cancelFooterReset()
-        sidebarFooterState = SidebarFooterState(
-            style: .inProgress,
-            title: description,
-            subtitle: nil,
-            detail: nil,
-            revealURL: nil
-        )
-    }
-
-    func setItemActionFailure(_ message: String) {
-        sidebarFooterState = SidebarFooterState(
-            style: .failure,
-            title: "Action Failed",
-            subtitle: message,
-            detail: nil,
-            revealURL: nil
-        )
-        scheduleFooterReset()
-    }
-
-    func setItemActionSuccess(title: String, subtitle: String, revealURL: URL?) {
-        sidebarFooterState = SidebarFooterState(
-            style: .success,
-            title: title,
-            subtitle: subtitle,
-            detail: nil,
-            revealURL: revealURL
-        )
-        scheduleFooterReset()
-    }
-
-    var activeScanSummary: String? {
-        let scanningSources = sources.filter(\.isScanning)
-        guard !scanningSources.isEmpty else {
-            return nil
-        }
-
-        if scanningSources.count == 1, let source = scanningSources.first {
-            return "\(source.displayName): \(source.scanStatus)"
-        }
-
-        return "Scanning \(scanningSources.count) sources..."
     }
 
     private func startScan(for sourceID: URL, mode: SourceDiscoveryMode) {
@@ -361,7 +283,6 @@ final class SourceLibrary: ObservableObject {
             source.previewLoadedCount = 0
             source.sizeLoadedCount = 0
         }
-        refreshSidebarFooterState()
 
         updateSource(sourceID) { source in
             source.accessDescriptor = sourceAccessMethod.accessDescriptor(for: source)
@@ -383,7 +304,6 @@ final class SourceLibrary: ObservableObject {
             source.availability = .available
             source.scanStatus = scanningLibraryStatus(for: source, mode: mode)
         }
-        refreshSidebarFooterState()
 
         do {
             let index = SourceIndexActor(sourceID: sourceID, folderURL: scanContextURL)
@@ -405,7 +325,6 @@ final class SourceLibrary: ObservableObject {
                         if let snapshot = await index.applyEnrichedItem(enrichedItem) {
                             await MainActor.run {
                                 library.applySnapshot(snapshot, to: sourceID)
-                                library.scheduleSidebarFooterRefresh()
                             }
                         }
                     }
@@ -466,8 +385,6 @@ final class SourceLibrary: ObservableObject {
                 ) {
                     applySnapshot(snapshot, to: sourceID)
                 }
-                scheduleSidebarFooterRefresh()
-
                 if itemForIndex.id == item.id, itemForIndex.metadataLoaded == false {
                     await enrichmentQueue.enqueue(item)
                 }
@@ -509,8 +426,6 @@ final class SourceLibrary: ObservableObject {
             if let snapshot = await index.markDiscoveryFinished() {
                 applySnapshot(snapshot, to: sourceID)
             }
-            refreshSidebarFooterState()
-
             await enrichmentQueue.finish()
             let enrichmentStartTime = Date()
 
@@ -529,7 +444,6 @@ final class SourceLibrary: ObservableObject {
                 applySnapshot(snapshot, to: sourceID)
             }
             persistSourceIfAvailable(withID: sourceID)
-            refreshSidebarFooterState()
 
             let previewStageStartTime = Date()
             let previewSeedItems = await index.currentItems()
@@ -540,7 +454,6 @@ final class SourceLibrary: ObservableObject {
             for previewItem in previewItems {
                 if let snapshot = await index.applyPreviewItem(previewItem) {
                     applySnapshot(snapshot, to: sourceID)
-                    scheduleSidebarFooterRefresh()
                 }
             }
 
@@ -555,7 +468,6 @@ final class SourceLibrary: ObservableObject {
                 applySnapshot(snapshot, to: sourceID)
             }
             persistSourceIfAvailable(withID: sourceID)
-            refreshSidebarFooterState()
 
             if source.origin.kind == .connectedDevice {
                 let sizeStageStartTime = Date()
@@ -567,7 +479,6 @@ final class SourceLibrary: ObservableObject {
                 for sizedItem in sizedItems {
                     if let snapshot = await index.applySizedItem(sizedItem) {
                         applySnapshot(snapshot, to: sourceID)
-                        scheduleSidebarFooterRefresh()
                     }
                 }
 
@@ -596,7 +507,6 @@ final class SourceLibrary: ObservableObject {
                     }
                 }
                 persistSourceIfAvailable(withID: sourceID)
-                refreshSidebarFooterState()
                 logScanStage(
                     "Total",
                     elapsed: Date().timeIntervalSince(scanStartTime),
@@ -629,7 +539,6 @@ final class SourceLibrary: ObservableObject {
                         if let snapshot = await index.applySizedItem(sizedItem) {
                             await MainActor.run {
                                 library.applySnapshot(snapshot, to: sourceID)
-                                library.scheduleSidebarFooterRefresh()
                             }
                         }
                     }
@@ -670,7 +579,6 @@ final class SourceLibrary: ObservableObject {
                 }
             }
             persistSourceIfAvailable(withID: sourceID)
-            refreshSidebarFooterState()
             logScanStage(
                 "Total",
                 elapsed: Date().timeIntervalSince(scanStartTime),
@@ -719,7 +627,6 @@ final class SourceLibrary: ObservableObject {
                 source.isScanning = false
             }
             persistSourceIfAvailable(withID: sourceID)
-            refreshSidebarFooterState()
         }
     }
 
@@ -746,7 +653,6 @@ final class SourceLibrary: ObservableObject {
                 sourceID: sourceID
             )
         }
-        refreshSidebarFooterState()
     }
 
     private func handleSizedItem(_ sizedItem: MinecraftContentItem, for sourceID: URL) {
@@ -762,7 +668,6 @@ final class SourceLibrary: ObservableObject {
                 source.scanStatus = "Calculating sizes for \(source.rawItems.filter(\.sizeLoaded).count) of \(source.indexedItemCount) items..."
             }
         }
-        refreshSidebarFooterState()
     }
 
     private func rebuildNormalizedIndex(for sourceID: URL) {
@@ -1647,7 +1552,6 @@ final class SourceLibrary: ObservableObject {
     private func restorePersistedSources() async {
         defer {
             isRestoringPersistedSources = false
-            refreshSidebarFooterState()
         }
 
         let records: [PersistedSourceRecord]
@@ -1708,7 +1612,6 @@ final class SourceLibrary: ObservableObject {
         }
 
         sources.sort { $0.displayName.localizedStandardCompare($1.displayName) == .orderedAscending }
-        refreshSidebarFooterState()
         await Task.yield()
 
         for record in records {
@@ -1993,91 +1896,6 @@ final class SourceLibrary: ObservableObject {
         contentType == .behaviorPack || contentType == .resourcePack
     }
 
-    private func refreshSidebarFooterState() {
-        footerRefreshTask?.cancel()
-        footerRefreshTask = nil
-
-        if isRestoringPersistedSources {
-            cancelFooterReset()
-            sidebarFooterState = SidebarFooterState(
-                style: .inProgress,
-                title: "Restoring library...",
-                subtitle: "Loading saved sources and cached metadata",
-                detail: nil,
-                revealURL: nil
-            )
-            return
-        }
-
-        let scanningSources = sources.filter(\.isScanning)
-        if let source = scanningSources.first {
-            cancelFooterReset()
-            let title = source.liveScanStatusTitle.isEmpty
-                ? "Scanning Minecraft library..."
-                : source.liveScanStatusTitle
-            let subtitle: String
-            let detail: String?
-            if source.indexedItemCount > 0 {
-                subtitle = source.displayName
-                switch source.scanPhase {
-                case .discovering:
-                    detail = "\(source.indexedItemCount) items found"
-                case .metadata:
-                    detail = "\(source.indexedDetailCount) of \(source.indexedItemCount) indexed"
-                case .previews:
-                    detail = "\(source.previewLoadedCount) of \(source.indexedItemCount) previews loaded"
-                case .sizing:
-                    detail = "\(source.sizeLoadedCount) of \(source.indexedItemCount) sizes calculated"
-                case .completed, .idle:
-                    detail = "\(source.indexedDetailCount) of \(source.indexedItemCount) indexed"
-                }
-            } else {
-                subtitle = "Searching \(source.displayName)"
-                detail = nil
-            }
-
-            sidebarFooterState = SidebarFooterState(
-                style: .inProgress,
-                title: title,
-                subtitle: subtitle,
-                detail: detail,
-                revealURL: nil
-            )
-            return
-        }
-
-        if let source = sources.first(where: { $0.scanError != nil }) {
-            sidebarFooterState = SidebarFooterState(
-                style: .failure,
-                title: "Scan failed",
-                subtitle: source.scanError,
-                detail: nil,
-                revealURL: nil
-            )
-            scheduleFooterReset()
-            return
-        }
-        cancelFooterReset()
-        sidebarFooterState = SidebarFooterState(style: .idle, title: "", subtitle: nil, detail: nil, revealURL: nil)
-    }
-
-    private func scheduleSidebarFooterRefresh() {
-        guard !isRestoringPersistedSources else {
-            refreshSidebarFooterState()
-            return
-        }
-
-        footerRefreshTask?.cancel()
-        footerRefreshTask = Task { @MainActor [weak self] in
-            try? await Task.sleep(for: .seconds(Self.footerRefreshDebounce))
-            guard let self, !Task.isCancelled else {
-                return
-            }
-
-            self.refreshSidebarFooterState()
-        }
-    }
-
     @discardableResult
     private func updateAvailability(for sourceID: URL, to newAvailability: SourceAvailability) -> (previous: SourceAvailability, becameAvailable: Bool) {
         let previousAvailability = source(withID: sourceID)?.availability ?? .unknown
@@ -2165,11 +1983,6 @@ final class SourceLibrary: ObservableObject {
         return source.previewLoadedCount < itemCount || source.sizeLoadedCount < itemCount
     }
 
-    private func cancelFooterReset() {
-        footerResetTask?.cancel()
-        footerResetTask = nil
-    }
-
     private func initialScanStatus(for source: MinecraftSource, mode: SourceDiscoveryMode) -> String {
         switch (source.origin, mode) {
         case (.localFolder, .fullScan):
@@ -2231,18 +2044,6 @@ final class SourceLibrary: ObservableObject {
         }
     }
 
-    private func scheduleFooterReset(after seconds: Double = 5) {
-        cancelFooterReset()
-        footerResetTask = Task { @MainActor [weak self] in
-            try? await Task.sleep(for: .seconds(seconds))
-            guard let self, !Task.isCancelled else {
-                return
-            }
-
-            self.refreshSidebarFooterState()
-        }
-    }
-
     private func buildSnapshot(
         for source: MinecraftSource,
         scanRootURL: URL,

World Manager for Minecraft/SidebarColumnViews.swift

@@ -25,13 +25,11 @@ struct SourcesSidebarView: View {
     let sources: [MinecraftSource]
     let connectedDevices: [ConnectedDeviceSidebarEntry]
     @Binding var selection: SidebarSelection?
-    let footerState: SidebarFooterState
     let addSourceAction: () -> Void
     let addDeviceSourceAction: () -> Void
     let addConnectedDeviceAction: (ConnectedDeviceSidebarEntry) -> Void
     let rescanSourceAction: (MinecraftSource) -> Void
     let removeSourceAction: (MinecraftSource) -> Void
-    let revealFooterURLAction: (URL) -> Void
     let filters: (MinecraftSource) -> [SidebarFilter]
 
     var body: some View {
@@ -466,93 +464,6 @@ private struct ConnectedDeviceTransportIcon: View {
     }
 }
 
-private struct SidebarFooterView: View {
-    let state: SidebarFooterState
-    let revealAction: (URL) -> Void
-
-    var body: some View {
-        VStack(alignment: .leading, spacing: 8) {
-            HStack(spacing: 8) {
-                if state.style == .inProgress {
-                    ProgressView()
-                        .controlSize(.small)
-                        .tint(.appAccent)
-                }
-
-                Text(state.title)
-                    .font(.footnote.weight(.semibold))
-                    .foregroundStyle(primaryColor)
-                    .lineLimit(3)
-            }
-
-            if let subtitle = state.subtitle {
-                Text(subtitle)
-                    .font(.footnote)
-                    .foregroundStyle(.secondary)
-                    .lineLimit(2)
-            }
-
-            if let detail = state.detail {
-                Text(detail)
-                    .font(.caption)
-                    .foregroundStyle(.secondary)
-                    .lineLimit(1)
-            }
-
-            if let revealURL = state.revealURL {
-                Button("Reveal in Finder") {
-                    revealAction(revealURL)
-                }
-                .buttonStyle(.link)
-                .font(.footnote)
-            }
-        }
-        .frame(maxWidth: .infinity, alignment: .leading)
-        .padding(.horizontal, 12)
-        .padding(.vertical, 12)
-        .background(cardBackground, in: RoundedRectangle(cornerRadius: 16, style: .continuous))
-        .overlay {
-            RoundedRectangle(cornerRadius: 16, style: .continuous)
-                .strokeBorder(cardStroke)
-        }
-    }
-
-    private var primaryColor: Color {
-        switch state.style {
-        case .idle:
-            return .primary
-        case .inProgress:
-            return .appAccent
-        case .failure:
-            return .red
-        case .success:
-            return .appAccent
-        }
-    }
-
-    private var cardBackground: AnyShapeStyle {
-        switch state.style {
-        case .inProgress:
-            return AnyShapeStyle(Color.appAccent.opacity(0.08))
-        default:
-            return AnyShapeStyle(.regularMaterial)
-        }
-    }
-
-    private var cardStroke: Color {
-        switch state.style {
-        case .inProgress:
-            return Color.appAccent.opacity(0.18)
-        case .failure:
-            return .red.opacity(0.18)
-        case .success:
-            return Color.appAccent.opacity(0.16)
-        case .idle:
-            return .white.opacity(0.08)
-        }
-    }
-}
-
 struct SidebarColumnViews_Previews: PreviewProvider {
     static var previews: some View {
         SidebarColumnPreviewContainer()