shouldPopOn method

@override bool shouldPopOn(MultiStateSheetController<ThreeStateSheet> controller)

Controls how sheet should react on pop events.

Implementation

@override
bool shouldPopOn(MultiStateSheetController<ThreeStateSheet> controller) {
  switch (controller.closestState) {
    case ThreeStateSheet.hidden:
      controller.reset();
      return true;

    case ThreeStateSheet.open:
      controller.setState(ThreeStateSheet.hidden);
      return false;

    case ThreeStateSheet.expanded:
      controller.setState(ThreeStateSheet.open);
      return false;
  }
}