/// <summary>
/// When the mouse moves over an item on the list we highlight the item.
/// </summary>
/// <param name="e"></param>
protected override void OnMouseMove(MouseEventArgs e)
{
var item = ItemAt(e.Location);
Region invalid = new Region();
if (item != _HotItem)
{
//unhighlight any item that was previously highlighted
if (_HotItem != null)
{
_HotItem.ExpandHot = false;
_HotItem.Highlighted = false;
invalid.Union(_HotItem.Bounds);
}
_HotItem = item;
if (item != null)
{
invalid.Union(item.Bounds);
}
}
if (_HotItem != null)
{
_HotItem.Highlighted = true;
bool expandHot = _HotItem.ExpandBox.Contains(e.Location);
if (expandHot != _HotItem.ExpandHot)
{
invalid.Union(_HotItem.ExpandBox);
}
_HotItem.ExpandHot = expandHot;
_HotItem.HandleMouseMove(e);
}
Invalidate(invalid);
}
