protected virtual void OnNodeCollapsing(CollapsingEventArgs e)
{
if (this.NodeCollapsing != null)
{
NodeCollapsing(this, e);
}
}
internal protected virtual bool CollapseNode(TreeGridNode node)
{
if (node.IsExpanded)
{
CollapsingEventArgs exp = new CollapsingEventArgs(node);
this.OnNodeCollapsing(exp);
if (!exp.Cancel)
{
this.LockVerticalScrollBarUpdate(true);
this.SuspendLayout();
_inExpandCollapse = true;
node.IsExpanded = false;
foreach (TreeGridNode childNode in node.Nodes)
{
Debug.Assert(childNode.RowIndex != -1, "Row is NOT in the grid.");
this.UnSiteNode(childNode);
}
CollapsedEventArgs exped = new CollapsedEventArgs(node);
this.OnNodeCollapsed(exped);
//TO_DO: Convert this to a specific NodeCell property
_inExpandCollapse = false;
this.LockVerticalScrollBarUpdate(false);
this.ResumeLayout(true);
this.InvalidateCell(node.Cells[0]);
}
return(!exp.Cancel);
}
else
{
// row isn't expanded, so we didn't do anything.
return(false);
}
}