private void CollapseInternal(bool byInternal)
{
if (!is_expanded || nodes.Count < 1)
{
return;
}
if (IsRoot)
{
return;
}
bool cancel = false;
TreeView tree_view = TreeView;
if (tree_view != null)
{
TreeViewCancelEventArgs e = new TreeViewCancelEventArgs(this, false, TreeViewAction.Collapse);
tree_view.OnBeforeCollapse(e);
cancel = e.Cancel;
}
if (!cancel)
{
int count_to_next = CountToNext();
is_expanded = false;
if (tree_view != null)
{
tree_view.OnAfterCollapse(new TreeViewEventArgs(this));
bool hbar_visible = tree_view.hbar.Visible;
bool vbar_visible = tree_view.vbar.Visible;
tree_view.RecalculateVisibleOrder(this);
tree_view.UpdateScrollBars(false);
// CollapseBelow if we affect the visible area
if (visible_order < tree_view.skipped_nodes + tree_view.VisibleCount + 1 && ArePreviousNodesExpanded)
{
tree_view.CollapseBelow(this, count_to_next);
}
if (!byInternal && HasFocusInChildren())
{
tree_view.SelectedNode = this;
}
// If one or both of our scrollbars disappeared,
// invalidate everything
if ((hbar_visible & !tree_view.hbar.Visible) || (vbar_visible & !tree_view.vbar.Visible))
{
tree_view.Invalidate();
}
}
}
}
