swift 实现 macOS NSTableView 右键菜单

定义一个protocol

@objc protocol ContextMenu {
    @objc func tableView(_ tableView: NSTableView, menuForRows rows:IndexSet)->NSMenu?
    @objc func tableView(_ tableView: NSTableView, clickForRow row: Int) -> Void
}

extension tableview重写鼠标事件

extension NSTableView {
    open override func menu(for event: NSEvent) -> NSMenu? {
        let location = self.convert(event.locationInWindow, from: nil)
        let row = self.row(at: location)
        if row >= 0 && event.type == .rightMouseDown {
            
            var selected = self.selectedRowIndexes
            if  false ==  selected.contains(row) {
                selected = IndexSet.init(integer: row)
                self.selectRowIndexes(selected, byExtendingSelection: false)
            }
            if  let dele:ContextMenu = (self.delegate as? ContextMenu)  {
                return   dele.tableView(self, menuForRows: selected)
            }else{
                return super.menu(for: event)
            }
        }
        
        
        return super.menu(for: event)
    }
    open override func mouseDown(with event: NSEvent) {
        let location = self.convert(event.locationInWindow, from: nil)
        let row = self.row(at: location)
        if row >= 0 && event.type == .rightMouseDown {
            
            var selected = self.selectedRowIndexes
            if  false ==  selected.contains(row) {
                selected = IndexSet.init(integer: row)
                self.selectRowIndexes(selected, byExtendingSelection: false)
            }
            if  let dele:ContextMenu = (self.delegate as? ContextMenu)  {
                dele.tableView(self, clickForRow: row)
            }
        }
        return super.mouseDown(with: event)
    }
    open override func mouseEntered(with event: NSEvent) {
        var btInfo:BTInfo = BTInfo()
    }
    open override func mouseExited(with event: NSEvent) {
        
    }
}

使用

extension BTViewController: ContextMenu{
    @objc func tableView(_ tableView: NSTableView, menuForRows rows:IndexSet)->NSMenu?{
        let bt: BT = self.bts![self.btTableView.selectedRow]
        
      
        return self.menus(forTables: tableView, item: bt)
    }
    @objc func tableView(_ tableView: NSTableView, clickForRow row: Int) -> Void {
        
    }
}