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VLC-iOS
Commit d066b469 authored by Soomin Lee's avatar Soomin Lee
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Disable DnD

parent 3fdc850a
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Sources/VLCDragAndDropManager.swift
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......@@ -33,478 +33,479 @@ protocol VLCDragAndDropManagerDelegate: NSObjectProtocol {
}
@available(iOS 11.0, *)
class VLCDragAndDropManager<T>: NSObject, UICollectionViewDragDelegate, UITableViewDragDelegate, UICollectionViewDropDelegate, UITableViewDropDelegate, UIDropInteractionDelegate {
let utiTypeIdentifiers: [String] = VLCDragAndDropManager.supportedTypeIdentifiers()
var subcategory: VLCMediaSubcategoryModel<T>
/// Returns the supported type identifiers that VLC can process.
/// It fetches the identifiers in LSItemContentTypes from all the CFBundleDocumentTypes in the info.plist.
/// Video, Audio and Subtitle formats
///
/// - Returns: Array of UTITypeIdentifiers
private class func supportedTypeIdentifiers() -> [String] {
var typeIdentifiers: [String] = []
if let documents = Bundle.main.infoDictionary?["CFBundleDocumentTypes"] as? [[String: Any]] {
for item in documents {
if let value = item["LSItemContentTypes"] as? [String] {
typeIdentifiers.append(contentsOf: value)
}
}
}
return typeIdentifiers
}
@available(*, unavailable, message: "use init(category:)")
override init() {
fatalError()
}
init(subcategory: VLCMediaSubcategoryModel<T>) {
self.subcategory = subcategory
super.init()
}
// MARK: - TableView
func tableView(_ tableView: UITableView, canHandle session: UIDropSession) -> Bool {
return canHandleDropSession(session: session)
}
func tableView(_ tableView: UITableView, itemsForAddingTo session: UIDragSession, at indexPath: IndexPath, point: CGPoint) -> [UIDragItem] {
return dragItems(forIndexPath: indexPath)
}
func tableView(_ tableView: UITableView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
return dragItems(forIndexPath: indexPath)
}
func tableView(_ tableView: UITableView, dropSessionDidUpdate session: UIDropSession, withDestinationIndexPath destinationIndexPath: IndexPath?) -> UITableViewDropProposal {
let operation = dropOperation(hasActiveDrag: tableView.hasActiveDrag, firstSessionItem: session.items.first, withDestinationIndexPath: destinationIndexPath)
return UITableViewDropProposal(operation: operation, intent: .insertIntoDestinationIndexPath)
}
func tableView(_ tableView: UITableView, performDropWith coordinator: UITableViewDropCoordinator) {
let section = tableView.numberOfSections - 1
let row = tableView.numberOfRows(inSection: section)
let destinationPath = coordinator.destinationIndexPath ?? IndexPath(row: row, section: section)
for item in coordinator.items {
let itemProvider = item.dragItem.itemProvider
// we're not gonna handle moving of folders
if let sourceItem = item.dragItem.localObject, fileIsCollection(file: sourceItem as AnyObject) {
continue
}
if fileIsFolder(atIndexPath: destinationPath) { // handle dropping onto a folder
addDragItem(tableView: tableView, dragItem: item, toFolderAt: destinationPath)
continue
}
if item.sourceIndexPath != nil { // element within VLC
moveItem(tableView: tableView, item: item, toIndexPath: destinationPath)
continue
}
// Element dragging from another App
let placeholder = UITableViewDropPlaceholder(insertionIndexPath: destinationPath, reuseIdentifier: VLCPlaylistTableViewCell.cellIdentifier(), rowHeight: VLCPlaylistTableViewCell.heightOfCell())
let placeholderContext = coordinator.drop(item.dragItem, to: placeholder)
createFileWith(itemProvider: itemProvider) {
[weak self] file, error in
guard let strongSelf = self else { return }
if let file = file {
placeholderContext.commitInsertion() {
insertionIndexPath in
strongSelf.subcategory.dragAndDropManagerInsertItem(manager: strongSelf, item: file, atIndexPath: insertionIndexPath)
}
}
if let error = error as? DropError {
strongSelf.handleError(error: error, itemProvider: item.dragItem.itemProvider)
placeholderContext.deletePlaceholder()
}
}
}
}
private func inFolder() -> Bool {
return subcategory.dragAndDropManagerCurrentSelection(manager: self) as? MLLabel != nil
}
private func moveItem(tableView: UITableView, item: UITableViewDropItem, toIndexPath destinationPath: IndexPath) {
if let mlFile = item.dragItem.localObject as? MLFile, !mlFile.labels.isEmpty && !inFolder() {
tableView.performBatchUpdates({
tableView.insertRows(at: [destinationPath], with: .automatic)
subcategory.dragAndDropManagerInsertItem(manager: self, item: mlFile, atIndexPath: destinationPath)
subcategory.dragAndDropManagerRemoveFileFromFolder(manager: self, file: mlFile)
}, completion: nil)
}
}
private func addDragItem(tableView: UITableView, dragItem item: UITableViewDropItem, toFolderAt index: IndexPath) {
if let sourcepath = item.sourceIndexPath { // local file that just needs to be moved
tableView.performBatchUpdates({
if let file = subcategory.dragAndDropManagerRequestsFile(manager: self, atIndexPath: sourcepath) as? MLFile {
tableView.deleteRows(at: [sourcepath], with: .automatic)
addFile(file: file, toFolderAt: index)
subcategory.dragAndDropManagerDeleteItem(manager: self, atIndexPath: sourcepath)
}
}, completion: nil)
return
}
// file from other app
createFileWith(itemProvider: item.dragItem.itemProvider) {
[weak self] file, error in
if let strongSelf = self, let file = file {
strongSelf.addFile(file: file, toFolderAt: index)
}
}
}
// MARK: - Collectionview
func collectionView(_ collectionView: UICollectionView, canHandle session: UIDropSession) -> Bool {
return canHandleDropSession(session: session)
}
func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
return dragItems(forIndexPath: indexPath)
}
func collectionView(_ collectionView: UICollectionView, itemsForAddingTo session: UIDragSession, at indexPath: IndexPath, point: CGPoint) -> [UIDragItem] {
return dragItems(forIndexPath: indexPath)
}
func collectionView(_ collectionView: UICollectionView, dropSessionDidUpdate session: UIDropSession, withDestinationIndexPath destinationIndexPath: IndexPath?) -> UICollectionViewDropProposal {
let operation = dropOperation(hasActiveDrag: collectionView.hasActiveDrag, firstSessionItem: session.items.first, withDestinationIndexPath: destinationIndexPath)
return UICollectionViewDropProposal(operation: operation, intent: .insertIntoDestinationIndexPath)
}
func collectionView(_ collectionView: UICollectionView, performDropWith coordinator: UICollectionViewDropCoordinator) {
let section = collectionView.numberOfSections - 1
let row = collectionView.numberOfItems(inSection: section)
let destinationPath = coordinator.destinationIndexPath ?? IndexPath(row: row, section: section)
for item in coordinator.items {
if let sourceItem = item.dragItem.localObject, fileIsCollection(file: sourceItem as AnyObject) { // We're not handling moving of Collection
continue
}
if fileIsFolder(atIndexPath: destinationPath) { // handle dropping onto a folder
addDragItem(collectionView: collectionView, dragItem: item, toFolderAt: destinationPath)
continue
}
if item.sourceIndexPath != nil { // element within VLC
moveItem(collectionView: collectionView, item: item, toIndexPath: destinationPath)
continue
}
// Element from another App
let placeholder = UICollectionViewDropPlaceholder(insertionIndexPath: destinationPath, reuseIdentifier: VLCPlaylistCollectionViewCell.cellIdentifier())
let placeholderContext = coordinator.drop(item.dragItem, to: placeholder)
createFileWith(itemProvider: item.dragItem.itemProvider) {
[weak self] file, error in
guard let strongSelf = self else { return }
if let file = file {
placeholderContext.commitInsertion() {
insertionIndexPath in
strongSelf.subcategory.dragAndDropManagerInsertItem(manager: strongSelf, item: file, atIndexPath: insertionIndexPath)
}
}
if let error = error as? DropError {
strongSelf.handleError(error: error, itemProvider: item.dragItem.itemProvider)
placeholderContext.deletePlaceholder()
}
}
}
}
private func moveItem(collectionView: UICollectionView, item: UICollectionViewDropItem, toIndexPath destinationPath: IndexPath) {
if let mlFile = item.dragItem.localObject as? MLFile, !mlFile.labels.isEmpty && !inFolder() {
collectionView.performBatchUpdates({
collectionView.insertItems(at: [destinationPath])
subcategory.dragAndDropManagerInsertItem(manager: self, item: mlFile, atIndexPath: destinationPath)
subcategory.dragAndDropManagerRemoveFileFromFolder(manager: self, file: mlFile)
}, completion: nil)
}
}
private func addDragItem(collectionView: UICollectionView, dragItem item: UICollectionViewDropItem, toFolderAt index: IndexPath) {
if let sourcepath = item.sourceIndexPath {
// local file that just needs to be moved
collectionView.performBatchUpdates({
if let file = subcategory.dragAndDropManagerRequestsFile(manager: self, atIndexPath: sourcepath) as? MLFile {
collectionView.deleteItems(at: [sourcepath])
addFile(file: file, toFolderAt: index)
subcategory.dragAndDropManagerDeleteItem(manager: self, atIndexPath: sourcepath)
}
}, completion: nil)
} else {
// file from other app
createFileWith(itemProvider: item.dragItem.itemProvider) {
[weak self] file, error in
if let strongSelf = self, let file = file {
strongSelf.addFile(file: file, toFolderAt: index)
}
}
}
}
// MARK: - DropInteractionDelegate for EmptyView
func dropInteraction(_ interaction: UIDropInteraction, canHandle session: UIDropSession) -> Bool {
return canHandleDropSession(session: session)
}
func dropInteraction(_ interaction: UIDropInteraction, sessionDidUpdate session: UIDropSession) -> UIDropProposal {
return UIDropProposal(operation: .copy)
}
func dropInteraction(_ interaction: UIDropInteraction, performDrop session: UIDropSession) {
for item in session.items {
createFileWith(itemProvider: item.itemProvider) {
[weak self] _, error in
if let error = error as? DropError {
self?.handleError(error: error, itemProvider: item.itemProvider)
}
// no need to handle the file case since the libraryVC updates itself after getting a file
}
}
}
// MARK: - Shared Methods
// Checks if the session has items conforming to typeidentifiers
private func canHandleDropSession(session: UIDropSession) -> Bool {
if session.localDragSession != nil {
return true
}
return session.hasItemsConforming(toTypeIdentifiers: utiTypeIdentifiers)
}
/// Returns a drop operation type
///
/// - Parameters:
/// - hasActiveDrag: State if the drag started within the app
/// - item: UIDragItem from session
/// - Returns: UIDropOperation
private func dropOperation(hasActiveDrag: Bool, firstSessionItem item: AnyObject?, withDestinationIndexPath destinationIndexPath: IndexPath?) -> UIDropOperation {
let inAlbum = subcategory.dragAndDropManagerCurrentSelection(manager: self) as? MLAlbum != nil
let inShow = subcategory.dragAndDropManagerCurrentSelection(manager: self) as? MLShow != nil
// you can move files into a folder or copy from anothr app into a folder
if fileIsFolder(atIndexPath: destinationIndexPath) {
// no dragging entire shows and albums into folders
if let dragItem = item, let mlFile = dragItem.localObject as? MLFile, mlFile.isAlbumTrack() || mlFile.isShowEpisode() {
return .forbidden
}
return hasActiveDrag ? .move : .copy
}
// you can't reorder
if inFolder() {
return hasActiveDrag ? .forbidden : .copy
}
// you can't reorder in or drag into an Album or Show
if inAlbum || inShow {
return .cancel
}
// we're dragging a file out of a folder
if let dragItem = item, let mlFile = dragItem.localObject as? MLFile, !mlFile.labels.isEmpty {
return .copy
}
// no reorder from another app into the top layer
return hasActiveDrag ? .forbidden : .copy
}
/// show an Alert when dropping failed
///
/// - Parameters:
/// - error: the type of error that happend
/// - itemProvider: the itemProvider to retrieve the suggestedName
private func handleError(error: DropError, itemProvider: NSItemProvider) {
let message: String
let filename = itemProvider.suggestedName ?? NSLocalizedString("THIS_FILE", comment: "")
switch error.kind {
case .loadFileRepresentationFailed:
message = String(format: NSLocalizedString("NOT_SUPPORTED_FILETYPE", comment: ""), filename)
case .moveFileToDocuments:
message = String(format: NSLocalizedString("FILE_EXISTS", comment: ""), filename)
}
let alert = UIAlertController(title: NSLocalizedString("ERROR", comment: ""), message: message, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: ""), style: .default, handler: nil))
UIApplication.shared.keyWindow?.rootViewController?.present(alert, animated: true, completion: nil)
}
private func fileIsFolder(atIndexPath indexPath: IndexPath?) -> Bool {
if let indexPath = indexPath {
let file = subcategory.dragAndDropManagerRequestsFile(manager: self, atIndexPath: indexPath)
return file as? MLLabel != nil
}
return false
}
private func fileIsCollection(file: Any?) -> Bool {
let isFolder = file as? MLLabel != nil
let isAlbum = file as? MLAlbum != nil
let isShow = file as? MLShow != nil
return isFolder || isAlbum || isShow
}
private func fileIsCollection(atIndexPath indexPath: IndexPath?) -> Bool {
if let indexPath = indexPath {
if let file = subcategory.dragAndDropManagerRequestsFile(manager: self, atIndexPath: indexPath) {
return fileIsCollection(file:file)
}
}
return false
}
// creating dragItems for the file at indexpath
private func dragItems(forIndexPath indexPath: IndexPath) -> [UIDragItem] {
if let file = subcategory.dragAndDropManagerRequestsFile(manager: self, atIndexPath: indexPath) {
if fileIsCollection(atIndexPath: indexPath) {
return dragItemsforCollection(file: file)
}
return dragItem(fromFile: file)
}
assert(false, "we can't generate a dragfile if the delegate can't return a file ")
return []
}
/// Iterates over the items of a collection to create dragitems.
/// Since we're not storing collections as folders we have to provide single files
///
/// - Parameter file: Can be of type MLAlbum, MLLabel or MLShow
/// - Returns: An array of UIDragItems
private func dragItemsforCollection(file: Any) -> [UIDragItem] {
var dragItems = [UIDragItem]()
var set = Set<AnyHashable>()
if let folder = file as? MLLabel {
set = folder.files
} else if let album = file as? MLAlbum {
for track in album.tracks {
if let mlfile = (track as? MLAlbumTrack)?.files.first {
_ = set.insert(mlfile)
}
}
} else if let show = file as? MLShow {
for episode in show.episodes {
if let mlfile = (episode as? MLShowEpisode)?.files {
set = set.union(mlfile)
}
}
} else {
assert(false, "can't get dragitems from a file that is not a collection")
}
for convertibleFile in set {
if let mlfile = convertibleFile as? MLFile, let item = dragItem(fromFile: mlfile).first {
dragItems.append(item)
}
}
return dragItems
}
//Provides an item for other applications
private func dragItem(fromFile file: Any) -> [UIDragItem] {
guard let file = mlFile(from: file as AnyObject), let path = file.url else {
assert(false, "can't create a dragitem if there is no file or the file has no url")
return []
}
let data = try? Data(contentsOf: path, options: .mappedIfSafe)
let itemProvider = NSItemProvider()
itemProvider.suggestedName = path.lastPathComponent
// maybe use UTTypeForFileURL
if let identifiers = try? path.resourceValues(forKeys: [.typeIdentifierKey]), let identifier = identifiers.typeIdentifier {
// here we can show progress
itemProvider.registerDataRepresentation(forTypeIdentifier: identifier, visibility: .all) { completion -> Progress? in
completion(data, nil)
return nil
}
let dragitem = UIDragItem(itemProvider: itemProvider)
dragitem.localObject = file
return [dragitem]
}
assert(false, "we can't provide a typeidentifier")
return []
}
private func mlFile(from file: AnyObject) -> MLFile? {
if let episode = file as? MLShowEpisode, let convertedfile = episode.files.first as? MLFile {
return convertedfile
}
if let track = file as? MLAlbumTrack, let convertedfile = track.files.first as? MLFile {
return convertedfile
}
if let convertedfile = file as? MLFile {
return convertedfile
}
return nil
}
private func addFile(file: MLFile, toFolderAt folderIndex: IndexPath) {
let label = subcategory.dragAndDropManagerRequestsFile(manager: self, atIndexPath: folderIndex) as! MLLabel
DispatchQueue.main.async {
_ = label.files.insert(file)
file.labels = [label]
file.folderTrackNumber = NSNumber(integerLiteral: label.files.count - 1)
}
}
/// try to create a file from the dropped item
///
/// - Parameters:
/// - itemProvider: itemprovider which is used to load the files from
/// - completion: callback with the successfully created file or error if it failed
private func createFileWith(itemProvider: NSItemProvider, completion: @escaping ((MLFile?, Error?) -> Void)) {
itemProvider.loadFileRepresentation(forTypeIdentifier: kUTTypeData as String) {
[weak self] (url, error) in
guard let strongSelf = self else { return }
guard let url = url else {
DispatchQueue.main.async {
completion(nil, DropError(kind: .loadFileRepresentationFailed))
}
return
}
// returns nil for local session but this should also not be called for a local session
guard let destinationURL = strongSelf.moveFileToDocuments(fromURL: url) else {
DispatchQueue.main.async {
completion(nil, DropError(kind: .moveFileToDocuments))
}
return
}
DispatchQueue.global(qos: .background).async {
let sharedlib = MLMediaLibrary.sharedMediaLibrary() as? MLMediaLibrary
sharedlib?.addFilePaths([destinationURL.path])
if let file = MLFile.file(for: destinationURL).first as? MLFile {
DispatchQueue.main.async {
// we dragged into a folder
if let selection = strongSelf.subcategory.dragAndDropManagerCurrentSelection(manager: strongSelf) as? MLLabel {
file.labels = [selection]
}
completion(file, nil)
}
}
}
}
}
private func moveFileToDocuments(fromURL filepath: URL?) -> URL? {
let searchPaths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
let newDirectoryPath = searchPaths.first
guard let directoryPath = newDirectoryPath, let url = filepath else {
return nil
}
let destinationURL = URL(fileURLWithPath: "\(directoryPath)" + "/" + "\(url.lastPathComponent)")
do {
try FileManager.default.moveItem(at: url, to: destinationURL)
} catch let error {
print(error.localizedDescription)
return nil
}
return destinationURL
}
class VLCDragAndDropManager<ModelType>: NSObject {
//, UICollectionViewDragDelegate, UITableViewDragDelegate, UICollectionViewDropDelegate, UITableViewDropDelegate, UIDropInteractionDelegate {
// let utiTypeIdentifiers: [String] = VLCDragAndDropManager.supportedTypeIdentifiers()
// var cateory: ModelType
// /// Returns the supported type identifiers that VLC can process.
// /// It fetches the identifiers in LSItemContentTypes from all the CFBundleDocumentTypes in the info.plist.
// /// Video, Audio and Subtitle formats
// ///
// /// - Returns: Array of UTITypeIdentifiers
// private class func supportedTypeIdentifiers() -> [String] {
// var typeIdentifiers: [String] = []
// if let documents = Bundle.main.infoDictionary?["CFBundleDocumentTypes"] as? [[String: Any]] {
// for item in documents {
// if let value = item["LSItemContentTypes"] as? [String] {
// typeIdentifiers.append(contentsOf: value)
// }
// }
// }
// return typeIdentifiers
// }
//
// @available(*, unavailable, message: "use init(category:)")
// override init() {
// fatalError()
// }
//
// init(cateory: ModelType) {
// self.cateory = cateory
// super.init()
// }
//
// // MARK: - TableView
//
// func tableView(_ tableView: UITableView, canHandle session: UIDropSession) -> Bool {
// return canHandleDropSession(session: session)
// }
//
// func tableView(_ tableView: UITableView, itemsForAddingTo session: UIDragSession, at indexPath: IndexPath, point: CGPoint) -> [UIDragItem] {
// return dragItems(forIndexPath: indexPath)
// }
//
// func tableView(_ tableView: UITableView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
// return dragItems(forIndexPath: indexPath)
// }
//
// func tableView(_ tableView: UITableView, dropSessionDidUpdate session: UIDropSession, withDestinationIndexPath destinationIndexPath: IndexPath?) -> UITableViewDropProposal {
// let operation = dropOperation(hasActiveDrag: tableView.hasActiveDrag, firstSessionItem: session.items.first, withDestinationIndexPath: destinationIndexPath)
// return UITableViewDropProposal(operation: operation, intent: .insertIntoDestinationIndexPath)
// }
//
// func tableView(_ tableView: UITableView, performDropWith coordinator: UITableViewDropCoordinator) {
// let section = tableView.numberOfSections - 1
// let row = tableView.numberOfRows(inSection: section)
// let destinationPath = coordinator.destinationIndexPath ?? IndexPath(row: row, section: section)
//
// for item in coordinator.items {
// let itemProvider = item.dragItem.itemProvider
// // we're not gonna handle moving of folders
// if let sourceItem = item.dragItem.localObject, fileIsCollection(file: sourceItem as AnyObject) {
// continue
// }
//
// if fileIsFolder(atIndexPath: destinationPath) { // handle dropping onto a folder
// addDragItem(tableView: tableView, dragItem: item, toFolderAt: destinationPath)
// continue
// }
//
// if item.sourceIndexPath != nil { // element within VLC
// moveItem(tableView: tableView, item: item, toIndexPath: destinationPath)
// continue
// }
// // Element dragging from another App
// let placeholder = UITableViewDropPlaceholder(insertionIndexPath: destinationPath, reuseIdentifier: VLCPlaylistTableViewCell.cellIdentifier(), rowHeight: VLCPlaylistTableViewCell.heightOfCell())
// let placeholderContext = coordinator.drop(item.dragItem, to: placeholder)
// createFileWith(itemProvider: itemProvider) {
// [weak self] file, error in
//
// guard let strongSelf = self else { return }
//
// if let file = file {
// placeholderContext.commitInsertion() {
// insertionIndexPath in
// strongSelf.cateory.dragAndDropManagerInsertItem(manager: strongSelf, item: file, atIndexPath: insertionIndexPath)
// }
// }
// if let error = error as? DropError {
// strongSelf.handleError(error: error, itemProvider: item.dragItem.itemProvider)
// placeholderContext.deletePlaceholder()
// }
// }
// }
// }
//
// private func inFolder() -> Bool {
// return cateory.dragAndDropManagerCurrentSelection(manager: self) as? MLLabel != nil
// }
//
// private func moveItem(tableView: UITableView, item: UITableViewDropItem, toIndexPath destinationPath: IndexPath) {
// if let mlFile = item.dragItem.localObject as? MLFile, !mlFile.labels.isEmpty && !inFolder() {
// tableView.performBatchUpdates({
// tableView.insertRows(at: [destinationPath], with: .automatic)
// cateory.dragAndDropManagerInsertItem(manager: self, item: mlFile, atIndexPath: destinationPath)
// cateory.dragAndDropManagerRemoveFileFromFolder(manager: self, file: mlFile)
// }, completion: nil)
// }
// }
//
// private func addDragItem(tableView: UITableView, dragItem item: UITableViewDropItem, toFolderAt index: IndexPath) {
// if let sourcepath = item.sourceIndexPath { // local file that just needs to be moved
// tableView.performBatchUpdates({
// if let file = cateory.dragAndDropManagerRequestsFile(manager: self, atIndexPath: sourcepath) as? MLFile {
// tableView.deleteRows(at: [sourcepath], with: .automatic)
// addFile(file: file, toFolderAt: index)
// cateory.dragAndDropManagerDeleteItem(manager: self, atIndexPath: sourcepath)
// }
// }, completion: nil)
// return
// }
// // file from other app
// createFileWith(itemProvider: item.dragItem.itemProvider) {
// [weak self] file, error in
//
// if let strongSelf = self, let file = file {
// strongSelf.addFile(file: file, toFolderAt: index)
// }
// }
// }
//
// // MARK: - Collectionview
//
// func collectionView(_ collectionView: UICollectionView, canHandle session: UIDropSession) -> Bool {
// return canHandleDropSession(session: session)
// }
//
// func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
// return dragItems(forIndexPath: indexPath)
// }
//
// func collectionView(_ collectionView: UICollectionView, itemsForAddingTo session: UIDragSession, at indexPath: IndexPath, point: CGPoint) -> [UIDragItem] {
// return dragItems(forIndexPath: indexPath)
// }
//
// func collectionView(_ collectionView: UICollectionView, dropSessionDidUpdate session: UIDropSession, withDestinationIndexPath destinationIndexPath: IndexPath?) -> UICollectionViewDropProposal {
// let operation = dropOperation(hasActiveDrag: collectionView.hasActiveDrag, firstSessionItem: session.items.first, withDestinationIndexPath: destinationIndexPath)
// return UICollectionViewDropProposal(operation: operation, intent: .insertIntoDestinationIndexPath)
// }
//
// func collectionView(_ collectionView: UICollectionView, performDropWith coordinator: UICollectionViewDropCoordinator) {
// let section = collectionView.numberOfSections - 1
// let row = collectionView.numberOfItems(inSection: section)
// let destinationPath = coordinator.destinationIndexPath ?? IndexPath(row: row, section: section)
//
// for item in coordinator.items {
// if let sourceItem = item.dragItem.localObject, fileIsCollection(file: sourceItem as AnyObject) { // We're not handling moving of Collection
// continue
// }
// if fileIsFolder(atIndexPath: destinationPath) { // handle dropping onto a folder
// addDragItem(collectionView: collectionView, dragItem: item, toFolderAt: destinationPath)
// continue
// }
// if item.sourceIndexPath != nil { // element within VLC
// moveItem(collectionView: collectionView, item: item, toIndexPath: destinationPath)
// continue
// }
// // Element from another App
// let placeholder = UICollectionViewDropPlaceholder(insertionIndexPath: destinationPath, reuseIdentifier: VLCPlaylistCollectionViewCell.cellIdentifier())
// let placeholderContext = coordinator.drop(item.dragItem, to: placeholder)
// createFileWith(itemProvider: item.dragItem.itemProvider) {
// [weak self] file, error in
//
// guard let strongSelf = self else { return }
//
// if let file = file {
// placeholderContext.commitInsertion() {
// insertionIndexPath in
// strongSelf.cateory.dragAndDropManagerInsertItem(manager: strongSelf, item: file, atIndexPath: insertionIndexPath)
// }
// }
// if let error = error as? DropError {
// strongSelf.handleError(error: error, itemProvider: item.dragItem.itemProvider)
// placeholderContext.deletePlaceholder()
// }
// }
// }
// }
//
// private func moveItem(collectionView: UICollectionView, item: UICollectionViewDropItem, toIndexPath destinationPath: IndexPath) {
// if let mlFile = item.dragItem.localObject as? MLFile, !mlFile.labels.isEmpty && !inFolder() {
// collectionView.performBatchUpdates({
// collectionView.insertItems(at: [destinationPath])
// cateory.dragAndDropManagerInsertItem(manager: self, item: mlFile, atIndexPath: destinationPath)
// cateory.dragAndDropManagerRemoveFileFromFolder(manager: self, file: mlFile)
// }, completion: nil)
// }
// }
//
// private func addDragItem(collectionView: UICollectionView, dragItem item: UICollectionViewDropItem, toFolderAt index: IndexPath) {
// if let sourcepath = item.sourceIndexPath {
// // local file that just needs to be moved
// collectionView.performBatchUpdates({
// if let file = cateory.dragAndDropManagerRequestsFile(manager: self, atIndexPath: sourcepath) as? MLFile {
// collectionView.deleteItems(at: [sourcepath])
// addFile(file: file, toFolderAt: index)
// cateory.dragAndDropManagerDeleteItem(manager: self, atIndexPath: sourcepath)
// }
// }, completion: nil)
// } else {
// // file from other app
// createFileWith(itemProvider: item.dragItem.itemProvider) {
// [weak self] file, error in
// if let strongSelf = self, let file = file {
// strongSelf.addFile(file: file, toFolderAt: index)
// }
// }
// }
// }
//
// // MARK: - DropInteractionDelegate for EmptyView
//
// func dropInteraction(_ interaction: UIDropInteraction, canHandle session: UIDropSession) -> Bool {
// return canHandleDropSession(session: session)
// }
//
// func dropInteraction(_ interaction: UIDropInteraction, sessionDidUpdate session: UIDropSession) -> UIDropProposal {
// return UIDropProposal(operation: .copy)
// }
//
// func dropInteraction(_ interaction: UIDropInteraction, performDrop session: UIDropSession) {
// for item in session.items {
// createFileWith(itemProvider: item.itemProvider) {
// [weak self] _, error in
// if let error = error as? DropError {