internal Control GetFocussedChild()
{
// Look for any child with focus and keep going until we reach the bottom
Control focussedChild = ChildrenInternal.FirstOrDefault(c => c.IsFocussed);
if (focussedChild != null)
{
return(focussedChild.GetFocussedChild());
}
// We didn't find it so it must be us
return(IsFocussed ? this : null);
}
/// <summary>
/// Set focus down the hierarchy to be the current control
/// </summary>
/// <returns>
/// True if focus has been set, false if it failed for some reason.
/// </returns>
public bool Focus()
{
// If no change, return
if (IsFocussed && !ChildrenInternal.Any(c => c.IsFocussed))
{
return(true);
}
bool gotFocus = Focus(this);
IsFocussed = gotFocus;
return(gotFocus);
}
private void ChildrenOnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.NewItems != null)
{
foreach (Control child in e.NewItems)
{
ChildrenInternal.Add(child);
child.Parent = this;
}
}
if (e.OldItems != null)
{
foreach (Control child in e.OldItems)
{
ChildrenInternal.Remove(child);
RemoveLayoutInformationForChild(child);
child.Parent = this;
}
}
}
