void IListBoxController.Update(IReadOnlyList <IListItem> newList)
{
bool updateBegun = false;
void BeginUpdate()
{
if (!updateBegun)
{
// Call ListBox's BeginUpdate/EndUpdate only when needed
// tree structure changed to avoid flickering when only selection changes.
listBox.BeginUpdate();
updateBegun = true;
}
}
updating = true;
try
{
var edits = ListEdit.GetListEdits(currentList, newList);
currentList = newList;
foreach (var e in edits)
{
switch (e.Type)
{
case ListEdit.EditType.Insert:
BeginUpdate();
listBox.Items.Insert(e.Index, e.Item);
OnUpdateRow?.Invoke(e.Item, e.Index, null);
break;
case ListEdit.EditType.Delete:
BeginUpdate();
listBox.Items.RemoveAt(e.Index);
break;
case ListEdit.EditType.Reuse:
listBox.Items[e.Index] = e.Item;
OnUpdateRow?.Invoke(e.Item, e.Index, e.OldItem);
break;
case ListEdit.EditType.Select:
listBox.SelectedIndices.Add(e.Index);
break;
case ListEdit.EditType.Deselect:
listBox.SelectedIndices.Remove(e.Index);
break;
}
}
}
finally
{
if (updateBegun)
{
listBox.EndUpdate();
}
updating = false;
}
}
void UpdateStructure(IReadOnlyList <Item> newList)
{
var edits = ListEdit.GetListEdits(items, newList);
items = newList;
var columns = tableView.TableColumns();
NSIndexSet allColumnsSet = null;
foreach (var e in edits)
{
switch (e.Type)
{
case ListEdit.EditType.Insert:
using (var set = new NSIndexSet(e.Index))
tableView.InsertRows(set, NSTableViewAnimation.None);
break;
case ListEdit.EditType.Delete:
using (var set = new NSIndexSet(e.Index))
tableView.RemoveRows(set, NSTableViewAnimation.None);
break;
case ListEdit.EditType.Reuse:
if (owner.OnUpdateView != null && owner.OnCreateView != null)
{
for (int col = 0; col < columns.Length; ++col)
{
var existingView = tableView.GetView(col, e.Index, makeIfNecessary: false);
if (existingView != null)
{
owner.OnUpdateView((Item)e.Item, columns[col], existingView, (Item)e.OldItem);
}
}
}
else
{
if (allColumnsSet == null)
{
allColumnsSet = NSIndexSet.FromArray(Enumerable.Range(0, columns.Length).ToArray());
}
using (var set = new NSIndexSet(e.Index))
tableView.ReloadData(set, allColumnsSet);
}
break;
}
}
allColumnsSet?.Dispose();
}