如何为 NSOutlineView 进行两种类型的拖放？

Question

如何进行Finder拖放样式？

我的 ViewController 代码是这样的。

class ViewController: NSViewController {
    override func viewDidLoad() {
        outlineView.registerForDraggedTypes([.string])
        outlineView.setDraggingSourceOperationMask(.move, forLocal: true)
    }
}

拖放的代码看起来像这样。

extension ViewController: NSOutlineViewDataSource {
    func outlineView(_ outlineView: NSOutlineView, pasteboardWriterForItem item: Any) -> NSPasteboardWriting? {
        guard item is SidebarRow else { return nil }
        let sidebarRowIndex = outlineView.row(forItem: item) + -1
        
        return sidebarSections[0].rows[sidebarRowIndex].name.rawValue as NSString
    }
    
    func outlineView(_ outlineView: NSOutlineView, validateDrop info: NSDraggingInfo, proposedItem item: Any?, proposedChildIndex index: Int) -> NSDragOperation {
        guard let outlineView = info.draggingSource as? NSOutlineView else { return [] }
        outlineView.draggingDestinationFeedbackStyle = .gap
        return .move
    }
    
    func outlineView(_ outlineView: NSOutlineView, acceptDrop info: NSDraggingInfo, item: Any?, childIndex index: Int) -> Bool {
        guard item != nil else { return false }
        
        guard let items = info.draggingPasteboard.pasteboardItems,
              let pasteboardItem = items.first,
              let pasteboardItemName = pasteboardItem.string(forType: .string),
              let rowIndex = sidebarSections[0].rows.firstIndex(where: { $0.name.rawValue == pasteboardItemName }) else { return false }
        
        let new = sidebarSections[0].rows[rowIndex]
        
        sidebarSections[0].rows.remove(at: rowIndex)
        sidebarSections[0].rows.insert(new, at: index)

        outlineView.moveItem(at: rowIndex, inParent: item, to: index, inParent: item)

        return true
    }
}

我的代码并没有完全做到这一点。

同样，其他样式的拖放怎么做？

Answer 1

感谢this answer。我的数据模型是结构。我已将侧边栏行转换为类，同时将侧边栏组保留为结构。