onRangeClicked method
Implementation
void onRangeClicked(UIEvent? event, DatepickerDateRange range) {
if (_presetSelection.isNotEmpty &&
_presetSelection.selectedValue!.range != range) {
_presetSelection.clear();
}
model.selectRange(range.clamp(min: minDate, max: maxDate));
if (event != null) _controller.add(event);
}