ListView with Item-Hover Event

private Point _mouseMoveLastLocation = Point.Empty;
private ListViewHitTestInfo _mouseMovePrevHitInfo = null; // only relevent when an handler is attached to the SubItemMouseHover event

protected override void OnMouseMove(MouseEventArgs e)
{
    base.OnMouseMove(e);
 
    if (e.Location != _mouseMoveLastLocation)
    {
        _mouseMoveLastLocation = e.Location;
 
        if (this.SubItemMouseHoverEventAttached)
        {
            ListViewHitTestInfo info = base.HitTest(e.Location);
 
            if (_mouseMovePrevHitInfo == null || info.SubItem != _mouseMovePrevHitInfo.SubItem)
            {
                int subItemIndex = ListViewEx.GetSubItemIndex(info.Item, info.SubItem);
                OnSubItemMouseHover(new ListViewSubItemMouseHoverEventArgs(info.Item, info.SubItem, subItemIndex, e.Location));
            }
 
            _mouseMovePrevHitInfo = info;
        }
    }
}
 

#region SubItemMouseHover event
public class ListViewSubItemMouseHoverEventArgs : EventArgs
{
    public readonly ListViewItem Item;
    public readonly ListViewItem.ListViewSubItem SubItem;
    public readonly int SubItemIndex; // Column index
    public readonly Point Location;
 
    public ListViewSubItemMouseHoverEventArgs(ListViewItem item, ListViewItem.ListViewSubItem subItem, int subItemIndex, Point location)
    {
        this.Item = item;
        this.SubItem = subItem;
        this.SubItemIndex = subItemIndex;
        this.Location = location;
    }
}
public delegate void ListViewSubItemMouseHoverEventHandler(object sender, ListViewSubItemMouseHoverEventArgs e);
 
[Category("Action")]
public event ListViewSubItemMouseHoverEventHandler SubItemMouseHover;
 
protected void OnSubItemMouseHover(ListViewSubItemMouseHoverEventArgs e)
{
    if (this.SubItemMouseHoverEventAttached)
        this.SubItemMouseHover(this, e);
}
 
private bool SubItemMouseHoverEventAttached { get { return this.SubItemMouseHover != null; } }
#endregion
// static method to retrieve the index of a SubItem (the column index)
public static int GetSubItemIndex(ListViewItem lvi, ListViewItem.ListViewSubItem lvsi)
{
    if (lvi == null || lvsi == null) return -1;
    for (int i = 0; i < lvi.SubItems.Count; i++) if (lvi.SubItems[i] == lvsi) return i;
    return -1;
}

private void myListView_SubItemMouseHover(object sender, JBLib.Controls.ListViewEx.ListViewSubItemMouseHoverEventArgs e)
{
    if (e.SubItemIndex == myDateColumn.Index) // myDateColumn is a ColumnHeader created in the designer (Columns collection)
        myTooltip.Show("Double-click to change the date", myListView, e.Location.X + 12, e.Location.Y, 2000);
    else if (e.SubItemIndex == myCityColumn.Index)
        myTooltip.Show("Double-click to change the city", myListView, e.Location.X + 12, e.Location.Y, 2000);
}

private void cList_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
	ListViewItem thisItem = this.cList.GetItemAt(e.X, e.Y);
 
	if(thisItem != null)
	{
		ListViewItem.ListViewSubItem thisSubItem = thisItem.GetSubItemAt(e.X, e.Y);
 
		if(thisSubItem.Tag != null)
		{
this.subItemToolTip.Show(thisSubItem.Tag.ToString(), this.cList, thisSubItem.Bounds.Location);
		}
	}
	else
	{
		this.subItemToolTip.SetToolTip(this.cList, "");
	}
}