private void item_TextCleared(object sender, EventArgs e)
{
ExpressionItem item = (ExpressionItem)sender;
if (item == secondLastItem && item != firstItem)
{
Control parent = item.Parent;
parent.Controls.Remove(item);
secondLastItem = (ExpressionItem)parent.Controls[parent.Controls.Count - 2];
}
}
private void AddItem()
{
ExpressionItem item = new ExpressionItem();
if (firstItem == null)
{
firstItem = item;
}
else if (secondLastItem == null)
{
secondLastItem = item;
}
item.TextChanged += item_TextChanged;
item.TextCleared += item_TextCleared;
topDockPanel1.SuspendDrawing();
topDockPanel1.AddControl(item);
topDockPanel1.ResumeDrawing();
}
