resolveChildren method

@override Map<FormFactor, Widget> resolveChildren(Map<FormFactor, Widget> explicitChildren, FormFactorsData formFactorsData)

For given list of supported form factors contained in formFactorsData and explicitly matched widgets, returns a map of matched widgets for all supported form factors.

Implementation

@override
Map<FormFactor, Widget> resolveChildren(
    Map<FormFactor, Widget> explicitChildren,
    FormFactorsData formFactorsData) {
  final result = <FormFactor, Widget>{};

  final portraitFormFactors = explicitChildren.keys
      .where((item) => item.orientation == Orientation.portrait);
  final landscapeFormFactors = explicitChildren.keys
      .where((element) => element.orientation == Orientation.landscape);
  final defaultPortrait =
      portraitFormFactors.isEmpty ? null : portraitFormFactors.first;
  final defaultLandscape =
      landscapeFormFactors.isEmpty ? null : landscapeFormFactors.first;

  FormFactor? currentFormFactor;
  for (FormFactor formFactor in formFactorsData.formFactors
      .where((item) => item.orientation == Orientation.portrait)) {
    if (explicitChildren.keys.contains(formFactor)) {
      currentFormFactor = formFactor;
    }
    result[formFactor] = explicitChildren[
        currentFormFactor ?? defaultPortrait ?? defaultLandscape]!;
  }
  currentFormFactor = null;
  for (FormFactor formFactor in formFactorsData.formFactors
      .where((item) => item.orientation == Orientation.landscape)) {
    if (explicitChildren.keys.contains(formFactor)) {
      currentFormFactor = formFactor;
    }
    result[formFactor] = explicitChildren[
        currentFormFactor ?? defaultLandscape ?? defaultPortrait]!;
  }
  return result;
}