NetNewsWire/Mac/MainWindow/Sidebar/SidebarOutlineDataSource.swift

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//
// SidebarOutlineDataSource.swift
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// NetNewsWire
//
// Created by Brent Simmons on 2/12/18.
// Copyright © 2018 Ranchero Software. All rights reserved.
//
import AppKit
import RSTree
import Articles
import RSCore
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import Account
@objc final class SidebarOutlineDataSource: NSObject, NSOutlineViewDataSource {
let treeController: TreeController
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static let dragOperationNone = NSDragOperation(rawValue: 0)
private var draggedNodes: Set<Node>? = nil
init(treeController: TreeController) {
self.treeController = treeController
}
// MARK: - NSOutlineViewDataSource
func outlineView(_ outlineView: NSOutlineView, numberOfChildrenOfItem item: Any?) -> Int {
return nodeForItem(item).numberOfChildNodes
}
func outlineView(_ outlineView: NSOutlineView, child index: Int, ofItem item: Any?) -> Any {
return nodeForItem(item).childNodes[index]
}
func outlineView(_ outlineView: NSOutlineView, isItemExpandable item: Any) -> Bool {
return nodeForItem(item).canHaveChildNodes
}
func outlineView(_ outlineView: NSOutlineView, pasteboardWriterForItem item: Any) -> NSPasteboardWriting? {
let node = nodeForItem(item)
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guard nodeRepresentsDraggableItem(node) else {
return nil
}
return (node.representedObject as? PasteboardWriterOwner)?.pasteboardWriter
}
// MARK: - Drag and Drop
func outlineView(_ outlineView: NSOutlineView, draggingSession session: NSDraggingSession, willBeginAt screenPoint: NSPoint, forItems draggedItems: [Any]) {
draggedNodes = Set(draggedItems.map { nodeForItem($0) })
}
func outlineView(_ outlineView: NSOutlineView, validateDrop info: NSDraggingInfo, proposedItem item: Any?, proposedChildIndex index: Int) -> NSDragOperation {
let draggedFolders = PasteboardFolder.pasteboardFolders(with: info.draggingPasteboard)
let draggedFeeds = PasteboardFeed.pasteboardFeeds(with: info.draggingPasteboard)
if (draggedFolders == nil && draggedFeeds == nil) || (draggedFolders != nil && draggedFeeds != nil) {
return SidebarOutlineDataSource.dragOperationNone
}
let parentNode = nodeForItem(item)
if let draggedFolders = draggedFolders {
if draggedFolders.count == 1 {
return validateLocalFolderDrop(outlineView, draggedFolders.first!, parentNode, index)
} else {
return validateLocalFoldersDrop(outlineView, draggedFolders, parentNode, index)
}
}
if let draggedFeeds = draggedFeeds {
let contentsType = draggedFeedContentsType(draggedFeeds)
switch contentsType {
case .singleNonLocal:
let draggedNonLocalFeed = singleNonLocalFeed(from: draggedFeeds)!
return validateSingleNonLocalFeedDrop(outlineView, draggedNonLocalFeed, parentNode, index)
case .singleLocal:
let draggedFeed = draggedFeeds.first!
return validateSingleLocalFeedDrop(outlineView, draggedFeed, parentNode, index)
case .multipleLocal:
return validateLocalFeedsDrop(outlineView, draggedFeeds, parentNode, index)
case .multipleNonLocal, .mixed, .empty:
return SidebarOutlineDataSource.dragOperationNone
}
}
return SidebarOutlineDataSource.dragOperationNone
}
func outlineView(_ outlineView: NSOutlineView, acceptDrop info: NSDraggingInfo, item: Any?, childIndex index: Int) -> Bool {
let draggedFolders = PasteboardFolder.pasteboardFolders(with: info.draggingPasteboard)
let draggedFeeds = PasteboardFeed.pasteboardFeeds(with: info.draggingPasteboard)
if (draggedFolders == nil && draggedFeeds == nil) || (draggedFolders != nil && draggedFeeds != nil) {
return false
}
let parentNode = nodeForItem(item)
if let draggedFolders = draggedFolders {
return acceptLocalFoldersDrop(outlineView, draggedFolders, parentNode, index)
}
if let draggedFeeds = draggedFeeds {
let contentsType = draggedFeedContentsType(draggedFeeds)
switch contentsType {
case .singleNonLocal:
let draggedNonLocalFeed = singleNonLocalFeed(from: draggedFeeds)!
return acceptSingleNonLocalFeedDrop(outlineView, draggedNonLocalFeed, parentNode, index)
case .singleLocal:
return acceptLocalFeedsDrop(outlineView, draggedFeeds, parentNode, index)
case .multipleLocal:
return acceptLocalFeedsDrop(outlineView, draggedFeeds, parentNode, index)
case .multipleNonLocal, .mixed, .empty:
return false
}
}
return false
}
}
// MARK: - Private
private extension SidebarOutlineDataSource {
func nodeForItem(_ item: Any?) -> Node {
if item == nil {
return treeController.rootNode
}
return item as! Node
}
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func nodeRepresentsDraggableItem(_ node: Node) -> Bool {
// Dont allow PseudoFeed to be dragged.
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// This will have to be revisited later. For instance,
// user-created smart feeds should be draggable, maybe.
return node.representedObject is Folder || node.representedObject is Feed
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}
// MARK: - Drag and Drop
enum DraggedFeedsContentsType {
case empty, singleLocal, singleNonLocal, multipleLocal, multipleNonLocal, mixed
}
func draggedFeedContentsType(_ draggedFeeds: Set<PasteboardFeed>) -> DraggedFeedsContentsType {
if draggedFeeds.isEmpty {
return .empty
}
if draggedFeeds.count == 1 {
let feed = draggedFeeds.first!
return feed.isLocalFeed ? .singleLocal : .singleNonLocal
}
var hasLocalFeed = false
var hasNonLocalFeed = false
for feed in draggedFeeds {
if feed.isLocalFeed {
hasLocalFeed = true
}
else {
hasNonLocalFeed = true
}
if hasLocalFeed && hasNonLocalFeed {
return .mixed
}
}
if hasLocalFeed {
return .multipleLocal
}
return .multipleNonLocal
}
func singleNonLocalFeed(from feeds: Set<PasteboardFeed>) -> PasteboardFeed? {
guard feeds.count == 1, let feed = feeds.first else {
return nil
}
return feed.isLocalFeed ? nil : feed
}
func validateSingleNonLocalFeedDrop(_ outlineView: NSOutlineView, _ draggedFeed: PasteboardFeed, _ parentNode: Node, _ index: Int) -> NSDragOperation {
// A non-local feed should always drag on to an Account or Folder node, with NSOutlineViewDropOnItemIndex since we dont know where it would sort till we read the feed.
guard let dropTargetNode = ancestorThatCanAcceptNonLocalFeed(parentNode) else {
return SidebarOutlineDataSource.dragOperationNone
}
if parentNode !== dropTargetNode || index != NSOutlineViewDropOnItemIndex {
outlineView.setDropItem(dropTargetNode, dropChildIndex: NSOutlineViewDropOnItemIndex)
}
return .copy
}
func validateSingleLocalFeedDrop(_ outlineView: NSOutlineView, _ draggedFeed: PasteboardFeed, _ parentNode: Node, _ index: Int) -> NSDragOperation {
// A local feed should always drag on to an Account or Folder node, and we can provide an index.
guard let dropTargetNode = ancestorThatCanAcceptLocalFeed(parentNode) else {
return SidebarOutlineDataSource.dragOperationNone
}
if nodeHasChildRepresentingDraggedFeed(dropTargetNode, draggedFeed) {
return SidebarOutlineDataSource.dragOperationNone
}
if violatesAccountSpecificBehavior(dropTargetNode, draggedFeed) {
return SidebarOutlineDataSource.dragOperationNone
}
if parentNode == dropTargetNode && index == NSOutlineViewDropOnItemIndex {
return localDragOperation()
}
let updatedIndex = indexWhereDraggedFeedWouldAppear(dropTargetNode, draggedFeed)
if parentNode !== dropTargetNode || index != updatedIndex {
outlineView.setDropItem(dropTargetNode, dropChildIndex: updatedIndex)
}
return localDragOperation()
}
func validateLocalFeedsDrop(_ outlineView: NSOutlineView, _ draggedFeeds: Set<PasteboardFeed>, _ parentNode: Node, _ index: Int) -> NSDragOperation {
// Local feeds should always drag on to an Account or Folder node, and index should be NSOutlineViewDropOnItemIndex since we cant provide multiple indexes.
guard let dropTargetNode = ancestorThatCanAcceptLocalFeed(parentNode) else {
return SidebarOutlineDataSource.dragOperationNone
}
if nodeHasChildRepresentingAnyDraggedFeed(dropTargetNode, draggedFeeds) {
return SidebarOutlineDataSource.dragOperationNone
}
if violatesAccountSpecificBehavior(dropTargetNode, draggedFeeds) {
return SidebarOutlineDataSource.dragOperationNone
}
if parentNode !== dropTargetNode || index != NSOutlineViewDropOnItemIndex {
outlineView.setDropItem(dropTargetNode, dropChildIndex: NSOutlineViewDropOnItemIndex)
}
return localDragOperation()
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}
func localDragOperation() -> NSDragOperation {
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if NSApplication.shared.currentEvent?.modifierFlags.contains(.option) ?? false {
return .copy
} else {
return .move
}
}
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func accountForNode(_ node: Node) -> Account? {
if let account = node.representedObject as? Account {
return account
}
if let folder = node.representedObject as? Folder {
return folder.account
}
if let feed = node.representedObject as? Feed {
return feed.account
}
return nil
}
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func commonAccountsFor(_ nodes: Set<Node>) -> Set<Account> {
var accounts = Set<Account>()
for node in nodes {
guard let oneAccount = accountForNode(node) else {
continue
}
accounts.insert(oneAccount)
}
return accounts
}
func accountHasFolderRepresentingAnyDraggedFolders(_ account: Account, _ draggedFolders: Set<PasteboardFolder>) -> Bool {
for draggedFolder in draggedFolders {
if account.existingFolder(with: draggedFolder.name) != nil {
return true
}
}
return false
}
func validateLocalFolderDrop(_ outlineView: NSOutlineView, _ draggedFolder: PasteboardFolder, _ parentNode: Node, _ index: Int) -> NSDragOperation {
guard let dropAccount = parentNode.representedObject as? Account, dropAccount.accountID != draggedFolder.accountID else {
return SidebarOutlineDataSource.dragOperationNone
}
if accountHasFolderRepresentingAnyDraggedFolders(dropAccount, Set([draggedFolder])) {
return SidebarOutlineDataSource.dragOperationNone
}
let updatedIndex = indexWhereDraggedFolderWouldAppear(parentNode, draggedFolder)
if index != updatedIndex {
outlineView.setDropItem(parentNode, dropChildIndex: updatedIndex)
}
return localDragOperation()
}
func validateLocalFoldersDrop(_ outlineView: NSOutlineView, _ draggedFolders: Set<PasteboardFolder>, _ parentNode: Node, _ index: Int) -> NSDragOperation {
guard let dropAccount = parentNode.representedObject as? Account else {
return SidebarOutlineDataSource.dragOperationNone
}
if accountHasFolderRepresentingAnyDraggedFolders(dropAccount, draggedFolders) {
return SidebarOutlineDataSource.dragOperationNone
}
for draggedFolder in draggedFolders {
if dropAccount.accountID == draggedFolder.accountID {
return SidebarOutlineDataSource.dragOperationNone
}
}
if index != NSOutlineViewDropOnItemIndex {
outlineView.setDropItem(parentNode, dropChildIndex: NSOutlineViewDropOnItemIndex)
}
return localDragOperation()
}
func copyFeedInAccount(node: Node, to parentNode: Node) {
guard let feed = node.representedObject as? Feed, let destination = parentNode.representedObject as? Container else {
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return
}
destination.account?.addFeed(feed, to: destination) { result in
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switch result {
case .success:
break
case .failure(let error):
NSApplication.shared.presentError(error)
}
}
}
func moveFeedInAccount(node: Node, to parentNode: Node) {
guard let feed = node.representedObject as? Feed,
let source = node.parent?.representedObject as? Container,
let destination = parentNode.representedObject as? Container else {
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return
}
BatchUpdate.shared.start()
source.account?.moveFeed(feed, from: source, to: destination) { result in
BatchUpdate.shared.end()
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switch result {
case .success:
break
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case .failure(let error):
NSApplication.shared.presentError(error)
}
}
}
func copyFeedBetweenAccounts(node: Node, to parentNode: Node) {
guard let feed = node.representedObject as? Feed,
let destinationAccount = nodeAccount(parentNode),
let destinationContainer = parentNode.representedObject as? Container else {
return
}
if let existingFeed = destinationAccount.existingFeed(withURL: feed.url) {
destinationAccount.addFeed(existingFeed, to: destinationContainer) { result in
switch result {
case .success:
break
case .failure(let error):
NSApplication.shared.presentError(error)
}
}
} else {
destinationAccount.createFeed(url: feed.url, name: feed.editedName, container: destinationContainer) { result in
switch result {
case .success:
break
case .failure(let error):
NSApplication.shared.presentError(error)
}
}
}
}
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func moveFeedBetweenAccounts(node: Node, to parentNode: Node) {
guard let feed = node.representedObject as? Feed,
let sourceAccount = nodeAccount(node),
let sourceContainer = node.parent?.representedObject as? Container,
let destinationAccount = nodeAccount(parentNode),
let destinationContainer = parentNode.representedObject as? Container else {
return
}
if let existingFeed = destinationAccount.existingFeed(withURL: feed.url) {
BatchUpdate.shared.start()
destinationAccount.addFeed(existingFeed, to: destinationContainer) { result in
switch result {
case .success:
sourceAccount.removeFeed(feed, from: sourceContainer) { result in
BatchUpdate.shared.end()
switch result {
case .success:
break
case .failure(let error):
NSApplication.shared.presentError(error)
}
}
case .failure(let error):
BatchUpdate.shared.end()
NSApplication.shared.presentError(error)
}
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}
} else {
BatchUpdate.shared.start()
destinationAccount.createFeed(url: feed.url, name: feed.editedName, container: destinationContainer) { result in
switch result {
case .success:
sourceAccount.removeFeed(feed, from: sourceContainer) { result in
BatchUpdate.shared.end()
switch result {
case .success:
break
case .failure(let error):
NSApplication.shared.presentError(error)
}
}
case .failure(let error):
BatchUpdate.shared.end()
NSApplication.shared.presentError(error)
}
}
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}
}
func acceptLocalFeedsDrop(_ outlineView: NSOutlineView, _ draggedFeeds: Set<PasteboardFeed>, _ parentNode: Node, _ index: Int) -> Bool {
guard let draggedNodes = draggedNodes else {
return false
}
draggedNodes.forEach { node in
if sameAccount(node, parentNode) {
if NSApplication.shared.currentEvent?.modifierFlags.contains(.option) ?? false {
copyFeedInAccount(node: node, to: parentNode)
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} else {
moveFeedInAccount(node: node, to: parentNode)
}
} else {
if NSApplication.shared.currentEvent?.modifierFlags.contains(.option) ?? false {
copyFeedBetweenAccounts(node: node, to: parentNode)
} else {
moveFeedBetweenAccounts(node: node, to: parentNode)
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}
}
}
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return true
}
func nodeIsAccountOrFolder(_ node: Node) -> Bool {
return node.representedObject is Account || node.representedObject is Folder
}
func nodeIsDropTarget(_ node: Node) -> Bool {
return node.canHaveChildNodes && nodeIsAccountOrFolder(node)
}
func ancestorThatCanAcceptLocalFeed(_ node: Node) -> Node? {
if nodeIsDropTarget(node) {
return node
}
guard let parentNode = node.parent else {
return nil
}
return ancestorThatCanAcceptLocalFeed(parentNode)
}
func ancestorThatCanAcceptNonLocalFeed(_ node: Node) -> Node? {
// Default to the On My Mac account, if needed, so we can always accept a nonlocal feed drop.
if nodeIsDropTarget(node) {
return node
}
guard let parentNode = node.parent else {
if let onMyMacAccountNode = treeController.nodeInTreeRepresentingObject(AccountManager.shared.defaultAccount) {
return onMyMacAccountNode
}
return nil
}
return ancestorThatCanAcceptNonLocalFeed(parentNode)
}
func copyFolderBetweenAccounts(node: Node, to parentNode: Node) {
guard let sourceFolder = node.representedObject as? Folder,
let destinationAccount = nodeAccount(parentNode) else {
return
}
replicateFolder(sourceFolder, destinationAccount: destinationAccount, completion: {})
}
func moveFolderBetweenAccounts(node: Node, to parentNode: Node) {
guard let sourceFolder = node.representedObject as? Folder,
let sourceAccount = nodeAccount(node),
let destinationAccount = nodeAccount(parentNode) else {
return
}
BatchUpdate.shared.start()
replicateFolder(sourceFolder, destinationAccount: destinationAccount) {
sourceAccount.removeFolder(sourceFolder) { result in
BatchUpdate.shared.end()
switch result {
case .success:
break
case .failure(let error):
NSApplication.shared.presentError(error)
}
}
}
}
func replicateFolder(_ folder: Folder, destinationAccount: Account, completion: @escaping () -> Void) {
destinationAccount.addFolder(folder.name ?? "") { result in
switch result {
case .success(let destinationFolder):
let group = DispatchGroup()
for feed in folder.topLevelFeeds {
if let existingFeed = destinationAccount.existingFeed(withURL: feed.url) {
group.enter()
destinationAccount.addFeed(existingFeed, to: destinationFolder) { result in
group.leave()
switch result {
case .success:
break
case .failure(let error):
NSApplication.shared.presentError(error)
}
}
} else {
group.enter()
destinationAccount.createFeed(url: feed.url, name: feed.editedName, container: destinationFolder) { result in
group.leave()
switch result {
case .success:
break
case .failure(let error):
NSApplication.shared.presentError(error)
}
}
}
}
group.notify(queue: DispatchQueue.main) {
completion()
}
case .failure(let error):
NSApplication.shared.presentError(error)
completion()
}
}
}
func acceptLocalFoldersDrop(_ outlineView: NSOutlineView, _ draggedFolders: Set<PasteboardFolder>, _ parentNode: Node, _ index: Int) -> Bool {
guard let draggedNodes = draggedNodes else {
return false
}
draggedNodes.forEach { node in
if !sameAccount(node, parentNode) {
if NSApplication.shared.currentEvent?.modifierFlags.contains(.option) ?? false {
copyFolderBetweenAccounts(node: node, to: parentNode)
} else {
moveFolderBetweenAccounts(node: node, to: parentNode)
}
}
}
return true
}
func acceptSingleNonLocalFeedDrop(_ outlineView: NSOutlineView, _ draggedFeed: PasteboardFeed, _ parentNode: Node, _ index: Int) -> Bool {
guard nodeIsDropTarget(parentNode), index == NSOutlineViewDropOnItemIndex else {
return false
}
// Show the add-feed sheet.
if let account = parentNode.representedObject as? Account {
appDelegate.addFeed(draggedFeed.url, name: draggedFeed.editedName ?? draggedFeed.name, account: account, folder: nil)
} else {
let account = parentNode.parent?.representedObject as? Account
let folder = parentNode.representedObject as? Folder
appDelegate.addFeed(draggedFeed.url, name: draggedFeed.editedName ?? draggedFeed.name, account: account, folder: folder)
}
return true
}
func nodeHasChildRepresentingDraggedFeed(_ parentNode: Node, _ draggedFeed: PasteboardFeed) -> Bool {
return nodeHasChildRepresentingAnyDraggedFeed(parentNode, Set([draggedFeed]))
}
func nodeRepresentsAnyDraggedFeed(_ node: Node, _ draggedFeeds: Set<PasteboardFeed>) -> Bool {
guard let feed = node.representedObject as? Feed else {
return false
}
for draggedFeed in draggedFeeds {
if feed.url == draggedFeed.url {
return true
}
}
return false
}
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func sameAccount(_ node: Node, _ parentNode: Node) -> Bool {
if let accountID = nodeAccountID(node), let parentAccountID = nodeAccountID(parentNode) {
if accountID == parentAccountID {
return true
}
}
return false
}
func nodeAccount(_ node: Node) -> Account? {
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if let account = node.representedObject as? Account {
return account
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} else if let folder = node.representedObject as? Folder {
return folder.account
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} else if let feed = node.representedObject as? Feed {
return feed.account
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} else {
return nil
}
}
func nodeAccountID(_ node: Node) -> String? {
return nodeAccount(node)?.accountID
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}
func nodeHasChildRepresentingAnyDraggedFeed(_ parentNode: Node, _ draggedFeeds: Set<PasteboardFeed>) -> Bool {
for node in parentNode.childNodes {
if nodeRepresentsAnyDraggedFeed(node, draggedFeeds) {
return true
}
}
return false
}
func violatesAccountSpecificBehavior(_ parentNode: Node, _ draggedFeed: PasteboardFeed) -> Bool {
return violatesAccountSpecificBehavior(parentNode, Set([draggedFeed]))
}
func violatesAccountSpecificBehavior(_ parentNode: Node, _ draggedFeeds: Set<PasteboardFeed>) -> Bool {
if violatesDisallowFeedInRootFolder(parentNode) {
return true
}
if violatesDisallowFeedCopyInRootFolder(parentNode, draggedFeeds) {
return true
}
return false
}
func violatesDisallowFeedInRootFolder(_ parentNode: Node) -> Bool {
guard let parentAccount = nodeAccount(parentNode), parentAccount.behaviors.contains(.disallowFeedInRootFolder) else {
return false
}
if parentNode.representedObject is Account {
return true
}
return false
}
func violatesDisallowFeedCopyInRootFolder(_ parentNode: Node, _ draggedFeeds: Set<PasteboardFeed>) -> Bool {
guard let parentAccount = nodeAccount(parentNode), parentAccount.behaviors.contains(.disallowFeedCopyInRootFolder) else {
return false
}
for draggedFeed in draggedFeeds {
if parentAccount.accountID != draggedFeed.accountID {
return false
}
}
if parentNode.representedObject is Account && (NSApplication.shared.currentEvent?.modifierFlags.contains(.option) ?? false) {
return true
}
return false
}
func indexWhereDraggedFeedWouldAppear(_ parentNode: Node, _ draggedFeed: PasteboardFeed) -> Int {
let draggedFeedWrapper = PasteboardFeedObjectWrapper(pasteboardFeed: draggedFeed)
let draggedFeedNode = Node(representedObject: draggedFeedWrapper, parent: nil)
let nodes = parentNode.childNodes + [draggedFeedNode]
// Revisit if the tree controller can ever be sorted in some other way.
let sortedNodes = nodes.sortedAlphabeticallyWithFoldersAtEnd()
let index = sortedNodes.firstIndex(of: draggedFeedNode)!
return index
}
func indexWhereDraggedFolderWouldAppear(_ parentNode: Node, _ draggedFolder: PasteboardFolder) -> Int {
let draggedFolderWrapper = PasteboardFolderObjectWrapper(pasteboardFolder: draggedFolder)
let draggedFolderNode = Node(representedObject: draggedFolderWrapper, parent: nil)
draggedFolderNode.canHaveChildNodes = true
let nodes = parentNode.childNodes + [draggedFolderNode]
// Revisit if the tree controller can ever be sorted in some other way.
let sortedNodes = nodes.sortedAlphabeticallyWithFoldersAtEnd()
let index = sortedNodes.firstIndex(of: draggedFolderNode)!
return index
}
}
final class PasteboardFeedObjectWrapper: DisplayNameProvider {
var nameForDisplay: String {
return pasteboardFeed.editedName ?? pasteboardFeed.name ?? ""
}
let pasteboardFeed: PasteboardFeed
init(pasteboardFeed: PasteboardFeed) {
self.pasteboardFeed = pasteboardFeed
}
}
final class PasteboardFolderObjectWrapper: DisplayNameProvider {
var nameForDisplay: String {
return pasteboardFolder.name
}
let pasteboardFolder: PasteboardFolder
init(pasteboardFolder: PasteboardFolder) {
self.pasteboardFolder = pasteboardFolder
}
}