//-------------------------------------------------------------------
protected override void OnMouseWheel(MouseEventArgs e)
{
if (Root == null)
{
return;
}
if (ModifierKeys.HasFlag(Keys.Control))
{
Options.Zoom *= Math.Sign(e.Delta) > 0 ? 1.1f : 0.9f;
EditionToolUpdate(null);
ShortcutModeClear();
RefreshGraph();
if (Selected != null)
{
Goto(Selected);
}
return;
}
PickingResult pickResult = PickTaxon(Root, ClientToGraph(e.Location));
TaxonTreeNode pick = pickResult?.GetMain();
if (pick != null)
{
if (e.Delta > 0)
{
pick.ExpandExtended();
RefreshGraph();
}
else
{
pick.CollapseExtended();
RefreshGraph();
if (pick.R.Bottom < e.Location.Y - Origin.Y)
{
Origin.Y = e.Location.Y + 10 - pick.R.Bottom;
}
}
}
}
