protected virtual void OnNodeCollapsing(CollapsingEventArgs e)
{
if (this.NodeCollapsing != null)
{
NodeCollapsing(this, e);
}
}
private void Collapse(bool collapseSelf, bool collapseChild)
{
CollapsingEventArgs args = new CollapsingEventArgs(this);
if (collapseSelf)
{
this.IsExpanded = false;
this.Grid.OnNodeCollapsing(args);
}
if (!args.Cancel)
{
foreach (TreeGridNode node in this.Nodes)
{
node.Collapse(collapseChild, collapseChild);
node.Visible = false;
}
this.Grid.InvalidateCell(this.Cells[0]);
this.Grid.OnNodeCollapsed(this);
}
}
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);
//TODO: 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);
}
}