MacOS Swift NSTableView with NSTokenFieldCell tracking which column drag started from

Question

I have a simple test program that has a 2 column NSTableView (View based), both columns have their cells set to NSTokenFieldCell. I also have a NSTokenField in this controller

I want to be able to drag and drop tokens from the table to the field. When I have 1 column this is working well. Now I have 2 columns I need to know which token to add to the field

Sample code:


class ViewController: NSViewController, NSTableViewDataSource, NSTableViewDelegate, NSTokenFieldDelegate {

    @IBOutlet weak var tableView: NSTableView!
    @IBOutlet weak var tokenField: NSTokenField!

let tokens = ["tok1","tok2","tok3","tok1","tok2","tok3","tok1","tok2","tok3","tok1","tok2","tok3","tok1","tok2","tok3","tok1","tok2","tok3"]
    let tokens2 = ["image","date","time","folder"]
    override func viewDidLoad() {
        super.viewDidLoad()

   }

    override var representedObject: Any? {
        didSet {
        // Update the view, if already loaded.
        }
    }

 func numberOfRows(in tableView: NSTableView) -> Int {
        return max(tokens.count,tokens2.count)
    }

    func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
        guard let vw = tableView.makeView(withIdentifier: tableColumn!.identifier, owner: self) as? NSTableCellView else {
            return nil
        }
        if tableColumn?.title == "Tokens" {
            vw.textField?.stringValue = tokens[row]
        }
        else
        {
            if row < tokens2.count {
                vw.textField?.stringValue = tokens2[row]
            }
            else {
            vw.textField?.stringValue = ""
            }
        }
        return vw
    }

// The bit where I need help 

func tableView(
        _ tableView: NSTableView,
        pasteboardWriterForRow row: Int)
        -> NSPasteboardWriting?
    {
            return tokens[row] as NSString //Here I need to return tokens2[row] if a token from column 2 was dragged and dropped
          
        }
    }

What I can't figure out is which column gets the click to initiate the drag and drop tableView.clickedColumn is always -1 None of the other functions such as this fire func tableView(_ tableView: NSTableView, updateDraggingItemsForDrag draggingInfo: NSDraggingInfo)

Update: I can get this function to fire as soon as I start the drag operation: func tableView(_ tableView: NSTableView, draggingSession session: NSDraggingSession, willBeginAt screenPoint: NSPoint, forRowIndexes rowIndexes: IndexSet)

I've tried to capture mouseDown but am not having any luck with it either. Any pointers?

"I want to be able to drag and drop tokens form the table to the field." tokens form? Or tokens from? What is the guy named 'the field'? NSTokenField? Or a guy named textField in the TableCellView? — El Tomato, Jun 25 '21 at 07:09
Is the table view cell based or view based? Do you want to drag a table row, a table cell or a token? — Willeke, Jun 25 '21 at 07:20
@ElTomato I want to drag and drop tokens FROM the table to the field — Gazing South, Jun 25 '21 at 07:26
@Willeke - view based table (Updated above - thanks) I want to be able to drag a token - (When it's one column this works as I don't have to figure out which column the token comes from — Gazing South, Jun 25 '21 at 07:28
I don't know a guy named 'the field.' Show a picture, which may help some people but me. — El Tomato, Jun 25 '21 at 07:29
So both columns have a `NSTokenField` as their text field? Do you want to drag a token from one `NSTokenField` to another? Are the token fields in the cells selectable or editable? — Willeke, Jun 25 '21 at 07:43
@Willeke yes both columns have ```NSTokenFieldCell``` as their text field I want to drag and drop a token from either column into the field below the table (It's a ```NSTokenField```) The token fields are selectable but not editable If I have one column then this is easy ```return tokens[row] as NSString``` When there is only one column the token copied to the pasteboard is alway the right one, but when there are 2 columns I need to know which columns token I need to copy — Gazing South, Jun 25 '21 at 07:50
Why can't you drag a token? `pasteboardWriterForRow` is for dragging rows. — Willeke, Jun 25 '21 at 07:53
@Willeke I understand that nstokenfields support drag and drop but I still need to get the token out of the tableview - I have other apps that have drag and drop of token between 2 token fields. This is the first time between a nstokenfieldcell embedded in a nstableview and a nstokenfield — Gazing South, Jun 25 '21 at 08:55
Fixed it - set NSTokenFieldCell to selectable (it had been set to none for some reason, don't recall doing it). Now the right token gets pasted. — Gazing South, Jun 25 '21 at 09:41

score 0 · Answer 1 · answered Jun 25 '21 at 09:42

0

The NSTokenFieldCell didn't have its property set to selectable once set the NTTokenFieldCell and the NSTokenField worked as desired.

answered Jun 25 '21 at 09:42

Gazing South

115
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MacOS Swift NSTableView with NSTokenFieldCell tracking which column drag started from

1 Answers1