void _applyFocusChange()
{
_haveScheduledUpdate = false;
FocusNode previousFocus = _primaryFocus;
if (_primaryFocus == null && _markedForFocus == null)
{
_markedForFocus = rootScope;
}
D.assert(FocusManagerUtils._focusDebug($"Refreshing focus state. Next focus will be {_markedForFocus}"));
if (_markedForFocus != null && _markedForFocus != _primaryFocus)
{
HashSet <FocusNode> previousPath = previousFocus?.ancestors != null ? new HashSet <FocusNode>(previousFocus.ancestors) : new HashSet <FocusNode>();
HashSet <FocusNode> nextPath = new HashSet <FocusNode>(_markedForFocus.ancestors);
foreach (FocusNode node in FocusTravesalUtils.difference(nextPath, previousPath))
{
_dirtyNodes.Add(node);
}
foreach (FocusNode node in FocusTravesalUtils.difference(previousPath, nextPath))
{
_dirtyNodes.Add(node);
}
_primaryFocus = _markedForFocus;
_markedForFocus = null;
}
if (previousFocus != _primaryFocus)
{
D.assert(FocusManagerUtils._focusDebug($"Updating focus from {previousFocus} to {_primaryFocus}"));
if (previousFocus != null)
{
_dirtyNodes.Add(previousFocus);
}
if (_primaryFocus != null)
{
_dirtyNodes.Add(_primaryFocus);
}
}
D.assert(FocusManagerUtils._focusDebug($"Notifying {_dirtyNodes.Count} dirty nodes:",
LinqUtils <string, FocusNode> .SelectList(_dirtyNodes, ((FocusNode node) => {
return(node.toString());
}))
));
foreach (FocusNode node in _dirtyNodes)
{
node._notify();
}
_dirtyNodes.Clear();
if (previousFocus != _primaryFocus)
{
notifyListeners();
}
D.assert(() => {
if (FocusManagerUtils._kDebugFocus)
{
FocusManagerUtils.debugDumpFocusTree();
}
return(true);
});
}
