protected override void OnKeyDown(KeyEventArgs e)
{
OLVListItem focused = FocusedItem as OLVListItem;
if (focused == null)
{
base.OnKeyDown(e);
return;
}
switch (e.KeyCode)
{
case Keys.Left:
if (SelectedObjects.Count > 1)
{
foreach (var o in SelectedObjects)
{
Branch br = TreeModel.GetBranch(o);
if (br.IsExpanded)
{
Collapse(o);
}
}
}
else
{
// If the branch is expanded, collapse it. If it's collapsed,
// select the parent of the branch.
Branch br = TreeModel.GetBranch(focused.RowObject);
if (br.IsExpanded)
{
Collapse(focused.RowObject);
}
else
{
if (br.ParentBranch != null && br.ParentBranch.Model != null)
{
SelectObject(br.ParentBranch.Model, true);
}
}
}
e.Handled = true;
break;
case Keys.Right:
foreach (var o in SelectedObjects)
{
Branch br = TreeModel.GetBranch(o);
if (br.IsExpanded)
{
List <Branch> filtered = br.FilteredChildBranches;
if (filtered.Count > 0)
{
SelectObject(filtered[0].Model, true);
}
}
else
{
if (br.CanExpand)
{
OnExpanding(new TreeBranchExpandingEventArgs(o, null));
Expand(o);
}
}
}
e.Handled = true;
break;
}
base.OnKeyDown(e);
}