import 'package:flutter/widgets.dart';

/// When a `Magnifier` is wrapped in this inherited widget,
/// it will check whether the zoomed content has hit edges,
/// and if so, will let parent gesture detectors win the gesture arena
///
/// Useful when placing Magnifier inside a gesture sensitive context,
/// such as [PageView], [Dismissible], [BottomSheet].
class MagnifierGestureDetectorScope extends InheritedWidget {
  const MagnifierGestureDetectorScope({
    Key? key,
    required this.axis,
    this.touchSlopFactor = .8,
    required Widget child,
  }) : super(key: key, child: child);

  static MagnifierGestureDetectorScope? of(BuildContext context) {
    final scope = context.dependOnInheritedWidgetOfExactType<MagnifierGestureDetectorScope>();
    return scope;
  }

  final List<Axis> axis;

  // in [0, 1[
  // 0: most reactive but will not let tap recognizers accept gestures
  // <1: less reactive but gives the most leeway to other recognizers
  // 1: will not be able to compete with a `HorizontalDragGestureRecognizer` up the widget tree
  final double touchSlopFactor;

  @override
  bool updateShouldNotify(MagnifierGestureDetectorScope oldWidget) {
    return axis != oldWidget.axis && touchSlopFactor != oldWidget.touchSlopFactor;
  }
}