clear method
void
clear()
清空子節點
Implementation
void clear() {
if (_children.isNotEmpty) {
for (var child in _children) {
child._parent = null;
}
_children.clear();
notifyListeners();
}
}
清空子節點
void clear() {
if (_children.isNotEmpty) {
for (var child in _children) {
child._parent = null;
}
_children.clear();
notifyListeners();
}
}