Reputation: 575
I have struck with one point i.e now I have got a list of data using NSTableView but what my requirement is, able to drag and drop that rows from one row position to another row position. please give any suggestion for get out this problem. Thanks in advance.
Upvotes: 1
Views: 251
Reputation: 74209
Within your NSTableViewDataSource
subclass implement WriteRows
, ValidateDrop
and AcceptDrop
and register which Drag/Drop targets your NSTableView
accepts. In this case you are only accepting Drops from within your own NSTableView
.
NSTableView
:// Any name can be registered, I find using the class name
// of the items in the datasource is cleaner than a const string
string DragDropType = typeof(Product).FullName;
NSTableView
:ProductTable.RegisterForDraggedTypes(new string[] { DragDropType });
NSTableViewDataSource
:public override bool WriteRows(NSTableView tableView, NSIndexSet rowIndexes, NSPasteboard pboard)
{
var data = NSKeyedArchiver.ArchivedDataWithRootObject(rowIndexes);
pboard.DeclareTypes(new string[] { DragDropType }, this);
pboard.SetDataForType(data, DragDropType);
return true;
}
public override NSDragOperation ValidateDrop(NSTableView tableView, NSDraggingInfo info, nint row, NSTableViewDropOperation dropOperation)
{
tableView.SetDropRowDropOperation(row, dropOperation);
return NSDragOperation.Move;
}
public override bool AcceptDrop(NSTableView tableView, NSDraggingInfo info, nint row, NSTableViewDropOperation dropOperation)
{
var rowData = info.DraggingPasteboard.GetDataForType(DragDropType);
if (rowData == null)
return false;
var dataArray = NSKeyedUnarchiver.UnarchiveObject(rowData) as NSIndexSet;
Console.WriteLine($"{dataArray}");
// Move hack for this example... you need to handle the complete NSIndexSet
tableView.BeginUpdates();
var tmpProduct = Products[(int)dataArray.FirstIndex];
Products.RemoveAt((int)dataArray.FirstIndex);
if (Products.Count == row - 1)
Products.Insert((int)row - 1 , tmpProduct);
else
Products.Insert((int)row, tmpProduct);
tableView.ReloadData();
tableView.EndUpdates();
return true;
}
Upvotes: 2