/// <summary>
/// Facilitates control over what tab is being entered, and whether it is okay to leave the last one.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void Entered(object sender, EventArgs e)
{
if (_blockEntrance)
{
return;
}
var casted = _prev as ITrackableWithSaving; //try to upcast to imply saveability
var current = sender as ITrackable;
if (casted == null || !casted.IsBeingWatched() || !casted.HasUnsavedChanges || _prev == current)
{
_prev = current;
return;
}
_blockEntrance = true;
_prev.Focus();
switch (_prev.RequestExit())
{
case RequestExitResult.AllowAndSave:
casted.SaveChanges();
_prev = current;
break;
case RequestExitResult.AllowWithoutSave:
_prev = current;
break;
}
_prev.Focus();
_blockEntrance = false;
}
