public override nfloat GetSizeToFitColumnWidth(NSOutlineView outlineView, nint column)
{
var columns = outlineView.TableColumns();
var col = columns[column];
var columnWidth = col.MinWidth;
for (nint row = 0; row < outlineView.RowCount; row++)
{
var rowView = outlineView.GetRowView(row, true);
var columnView = rowView.ViewAtColumn(column);
var width = columnView.Frame.Width;
if (column == 0)
{
width += columnView.Frame.X;
}
if (width > columnWidth)
{
columnWidth = NMath.Min(width, col.MaxWidth);
}
}
return(columnWidth);
}
void UpdateStructure(ITreeNode newRoot)
{
void Rebind(NSNodeItem item, ITreeNode newNode)
{
nodeToItem.Remove(item.Node);
item.Node = newNode;
nodeToItem[newNode] = item;
}
void DeleteDescendantsFromMap(NSNodeItem item)
{
item.Children.ForEach(c =>
{
Debug.Assert(nodeToItem.Remove(c.Node));
DeleteDescendantsFromMap(c);
});
}
var edits = TreeEdit.GetTreeEdits(rootItem.Node, newRoot, new TreeEdit.Options
{
TemporariltyExpandParentToInitChildren = true
});
Rebind(rootItem, newRoot);
foreach (var e in edits)
{
var node = nodeToItem[e.Node];
switch (e.Type)
{
case TreeEdit.EditType.Insert:
var insertedNode = CreateItem(e.NewChild);
node.Children.Insert(e.ChildIndex, insertedNode);
using (var set = new NSIndexSet(e.ChildIndex))
treeView.InsertItems(set, ToObject(node), NSTableViewAnimation.None);
break;
case TreeEdit.EditType.Delete:
var deletedNode = node.Children[e.ChildIndex];
node.Children.RemoveAt(e.ChildIndex);
Debug.Assert(deletedNode == nodeToItem[e.OldChild]);
nodeToItem.Remove(e.OldChild);
using (var set = new NSIndexSet(e.ChildIndex))
treeView.RemoveItems(set, ToObject(node), NSTableViewAnimation.None);
DeleteDescendantsFromMap(deletedNode);
break;
case TreeEdit.EditType.Reuse:
var viewItem = nodeToItem [e.OldChild];
Rebind(viewItem, e.NewChild);
treeView.ReloadItem(ToObject(viewItem), reloadChildren: false);
if (owner.OnUpdateRowView != null)
{
var rowIdx = treeView.RowForItem(ToObject(viewItem));
var rowView = rowIdx >= 0 ? treeView.GetRowView(rowIdx, makeIfNecessary: false) : null;
if (rowView != null)
{
owner.OnUpdateRowView(rowView, (Node)e.NewChild);
}
}
break;
case TreeEdit.EditType.Expand:
treeView.ExpandItem(ToObject(node), expandChildren: false);
break;
case TreeEdit.EditType.Collapse:
treeView.CollapseItem(ToObject(node), collapseChildren: false);
break;
}
}
}
public override NSTableRowView RowViewForItem(NSOutlineView outlineView, NSObject item)
{
return(outlineView.GetRowView(outlineView.RowForItem(item), false) ?? new TableRowView());
}