Show contextual menu on ctrl-click/right-click on header of NSTableView

user_465151 0
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I'm searching for an elegant way to detect a right-click/ctrl-click on the header of an NSTableView.

When the right click occurs, I want to display an contextual menu.

- (NSMenu *)menuForEvent:(NSEvent *)

detects only right clicks in the table - not in the header of the table.

thanks for your help.

right-click nstableview objective-c cocoa
4 Answers

Thanks Jakob Egger for his precise answer. I come up with Swift version of this approach. I changed the delegate method signature a little bit, to give more flexibility in case of more then one TableView in ViewController.

protocol IMenuTableHeaderViewDelegate: class {
    func menuForTableHeader(inTableView tableView: NSTableView, forTableColumn tableColumn: NSTableColumn) -> NSMenu?
}

class MenuTableHeaderView: NSTableHeaderView {
    weak var menuDelegate: IMenuTableHeaderViewDelegate?

    override func menu(for event: NSEvent) -> NSMenu? {
        guard tableView != nil else {
            return nil
        }
        let columnForMenu =  column(at: convert(event.locationInWindow, from: nil))
        if columnForMenu >= 0, tableView!.tableColumns.count > columnForMenu {
            if let tableColumn = tableView?.tableColumns[columnForMenu] {
                return menuDelegate?.menuForTableHeader(inTableView: tableView!, forTableColumn: tableColumn)
            }
        }
        return self.menu;
    }
}

To use this custom class, find NSTableHeaderView in the interface builder and change the class to MenuTableHeaderView

Window where you have to enter custom class name

Example of this approach usage in a ViewController

class ExampleViewController: NSViewController, IMenuTableHeaderViewDelegate {
    @IBOutlet weak var tableView: NSTableView!
    @IBOutlet var tableHeaderMenu: NSMenu!

    var lastColumnForMenu: HeaderColumnForMenu?

    struct HeaderColumnForMenu {
        let tableView: NSTableView
        let tableColumn: NSTableColumn
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        if let tableHeaderWithMenu = tableView.headerView as? MenuTableHeaderView {
            tableHeaderWithMenu.menuDelegate = self
        }
    }

    func menuForTableHeader(inTableView tableView: NSTableView, forTableColumn tableColumn: NSTableColumn) -> NSMenu? {
        //Save column to wich we are going to show menu
        lastColumnForMenu = HeaderColumnForMenu(tableView: tableView, tableColumn: tableColumn)
        if needShowMenu {
            return tableHeaderMenu
        }
        return nil
    }
}
user_86396940
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