| protected OnMouseWheel ( MouseEventArgs e ) : void | ||
| e | MouseEventArgs | |
| return | void | |
protected override void OnMouseWheel(MouseEventArgs e)
{
base.OnMouseWheel(e);
if (DroppedDown)
dropDown.ScrollDropDown(-(e.Delta / 120) * SystemInformation.MouseWheelScrollLines);
else if (e.Delta > 0) {
ComboTreeNode prev = GetPrevDisplayedNode();
if (prev != null) SetSelectedNode(prev);
}
else if (e.Delta < 0) {
ComboTreeNode next = GetNextDisplayedNode();
if (next != null) SetSelectedNode(next);
}
}