describeSemantics method Null safety
- Accumulator offset,
- List<
int> semanticsOffsets, - List semanticsElements
Populates the semanticsOffsets
and semanticsElements
with the appropriate data
to be able to construct a SemanticsNode.
If applicable, the beginning and end text offset are added to semanticsOffsets
.
PlaceholderSpans have a text length of 1, which corresponds to the object
replacement character (0xFFFC) that is inserted to represent it.
Any GestureRecognizers are added to semanticsElements
. Null is added to
semanticsElements
for PlaceholderSpans.
Implementation
void describeSemantics(Accumulator offset, List<int> semanticsOffsets, List<dynamic> semanticsElements) {
if (
recognizer != null &&
(recognizer is TapGestureRecognizer || recognizer is LongPressGestureRecognizer)
) {
final int length = semanticsLabel?.length ?? text!.length;
semanticsOffsets.add(offset.value);
semanticsOffsets.add(offset.value + length);
semanticsElements.add(recognizer);
}
offset.increment(text != null ? text!.length : 0);
}