int IIsolationHost.SelectNextControl(bool forward)
{
try
{
if (_select > 0)
{
return(1);
}
_select++;
try
{
// The client was the target of select next control. It
// has handed the search over to us and we continue from
// here. We need to wrap to get the correct behavior.
return(ControlUtil.GetRoot(this).SelectNextControl(this, forward, true, true, true) ? 0 : 1);
}
finally
{
_select--;
}
}
catch (Exception ex)
{
return(ErrorUtil.GetHResult(ex));
}
}
protected override void Select(bool directed, bool forward)
{
if (_select > 0)
{
return;
}
_select++;
try
{
// We were the target of select next control. Forward the
// call to the isolation client which does its search. If it
// matches a control, we need to make ourselves active.
if (ErrorUtil.ThrowOnFailure(_client.SelectNextControl(!directed || forward)))
{
base.Select(directed, forward);
return;
}
// If the client wasn't able to select something, we continue the
// search from here. One small detail is that SelectNextControl
// does not match itself. When it would match an IsolationClient,
// this would mean that the search does not go into the
// IsolationHost. We specifically match this case by first doing
// a non-wrapping search and matching the root for IsolationClient.
// If that matches, we allow the IsolationClient to continue
// the search upwards. Otherwise, we continue the search
// from the root as usual.
var root = ControlUtil.GetRoot(this);
if (root.SelectNextControl(this, !directed || forward, true, true, !(root is IsolationClient)))
{
return;
}
if (root is IsolationClient)
{
Stubs.ControlSelect(root, directed, forward);
}
}
finally
{
_select--;
}
}