public void NSOutlineView_InsertNull()
{
NSOutlineView v = new NSOutlineView();
v.BeginUpdates(); // We do this to prevent a crash: Insert/remove/move only works within a -beginUpdates/-endUpdates block or a View Based TableView
#if !XAMCORE_2_0
v.InsertItems(new NSIndexSet(0), null, NSTableViewAnimationOptions.EffectFade);
#else
v.InsertItems(new NSIndexSet(0), null, NSTableViewAnimation.None);
#endif
v.EndUpdates();
}
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);
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);
treeView.InsertItems(new NSIndexSet(e.ChildIndex), 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);
treeView.RemoveItems(new NSIndexSet(e.ChildIndex), ToObject(node), NSTableViewAnimation.None);
DeleteDescendantsFromMap(deletedNode);
break;
case TreeEdit.EditType.Reuse:
treeView.ReloadItem(ToObject(node));
Rebind(nodeToItem[e.OldChild], 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;
}
}
}
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;
}
}
}