getDrawable method
Attempt to lookup a Drawable by id
.
Implementation
DrawableStyleable? getDrawable(String id, {bool nullOk = false}) {
assert(id != null); // ignore: unnecessary_null_comparison
final DrawableStyleable? value = _drawables[id];
if (value == null && nullOk != true) {
throw StateError('Expected to find Drawable with id $id.\n'
'Have ids: ${_drawables.keys}');
}
return value;
}