/// <summary>
/// Attach control as child of control
/// </summary>
/// <param name="child">Child control</param>
/// <param name="atback">False, at front of Z order, True, at back</param>
public virtual void Add(GLBaseControl child, bool atback = false)
{
System.Diagnostics.Debug.Assert(!childrenz.Contains(child)); // no repeats
child.parent = this;
child.suspendLayoutCount = 0; // we unsuspend - controls are created suspended
child.ClearFlagsDown(); // in case of reuse, clear all temp flags as child is added
if (atback)
{
childrenz.Add(child);
childreniz.Insert(0, child);
}
else
{
int ipos = 0;
if (!child.TopMost) // add at end of top list.
{
while (ipos < childrenz.Count && childrenz[ipos].TopMost) // find first place we can insert
{
ipos++;
}
}
childrenz.Insert(ipos, child); // in z order. First is top of z. insert puts it before existing
childreniz.Insert(childreniz.Count - ipos, child); // in inv z order. Last is top of z. if ipos=0, at end. if ipos=1, inserted just before end
}
CheckZOrder(); // verify its okay
if (EnableThemer)
{
Themer?.Invoke(child); // global themer
}
OnControlAdd(this, child);
child.OnControlAdd(this, child);
InvalidateLayout(child); // we are invalidated and layout due to this child
}