performRebuild method
override
Cause the widget to update itself.
Called by rebuild after the appropriate checks have been made.
The base implementation only clears the dirty flag.
Implementation
@override
void performRebuild() {
_childWidgets.clear();
super.performRebuild();
if (_childElements.isEmpty) {
return;
}
final int firstIndex = _childElements.firstKey()!;
final int lastIndex = _childElements.lastKey()!;
for (int index = firstIndex; index <= lastIndex; ++index) {
final Element? newChild = updateChild(_childElements[index], retrieveWidget(index), index);
if (newChild != null) {
_childElements[index] = newChild;
} else {
_childElements.remove(index);
}
}
}