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Modal Bottom Sheet with Input Fields fix for Flutter
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| import 'dart:async'; | |
| import 'package:flutter/material.dart'; | |
| import 'package:meta/meta.dart'; | |
| Future<T> showModalBottomSheetApp<T>({ | |
| @required BuildContext context, | |
| @required WidgetBuilder builder, | |
| }) { | |
| assert(context != null); | |
| assert(builder != null); | |
| return Navigator.push(context, new _ModalBottomSheetRoute<T>( | |
| builder: builder, | |
| theme: Theme.of(context, shadowThemeOnly: true), | |
| barrierLabel: MaterialLocalizations | |
| .of(context) | |
| .modalBarrierDismissLabel, | |
| )); | |
| } | |
| class _ModalBottomSheetRoute<T> extends PopupRoute<T> { | |
| _ModalBottomSheetRoute({ | |
| this.builder, | |
| this.theme, | |
| this.barrierLabel, | |
| }); | |
| final WidgetBuilder builder; | |
| final ThemeData theme; | |
| @override | |
| Duration get transitionDuration => const Duration(milliseconds: 200); | |
| @override | |
| bool get barrierDismissible => true; | |
| @override | |
| final String barrierLabel; | |
| @override | |
| Color get barrierColor => Colors.black12; | |
| AnimationController _animationController; | |
| @override | |
| AnimationController createAnimationController() { | |
| assert(_animationController == null); | |
| _animationController = BottomSheet.createAnimationController(navigator.overlay); | |
| return _animationController; | |
| } | |
| @override | |
| Widget buildPage(BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation) { | |
| // By definition, the bottom sheet is aligned to the bottom of the page | |
| // and isn't exposed to the top padding of the MediaQuery. | |
| Widget bottomSheet = new MediaQuery.removePadding( | |
| context: context, | |
| removeTop: true, | |
| child: new _ModalBottomSheet<T>(route: this), | |
| ); | |
| if (theme != null) | |
| bottomSheet = new Theme(data: theme, child: bottomSheet); | |
| return bottomSheet; | |
| } | |
| } | |
| class _ModalBottomSheet<T> extends StatefulWidget { | |
| const _ModalBottomSheet({ Key key, this.route }) : super(key: key); | |
| final _ModalBottomSheetRoute<T> route; | |
| @override | |
| _ModalBottomSheetState<T> createState() => new _ModalBottomSheetState<T>(); | |
| } | |
| class _ModalBottomSheetState<T> extends State<_ModalBottomSheet<T>> { | |
| @override | |
| Widget build(BuildContext context) { | |
| return new AnimatedBuilder( | |
| animation: widget.route.animation, | |
| builder: (BuildContext context, Widget child) { | |
| return new CustomSingleChildLayout( | |
| delegate: new _ModalBottomSheetLayout(MediaQuery.of(context), widget.route.animation.value), | |
| child: new BottomSheet( | |
| animationController: widget.route._animationController, | |
| onClosing: () => Navigator.pop(context), | |
| builder: widget.route.builder | |
| ) | |
| ); | |
| } | |
| ); | |
| } | |
| } | |
| class _ModalBottomSheetLayout extends SingleChildLayoutDelegate { | |
| _ModalBottomSheetLayout(this.data, this.progress); | |
| final MediaQueryData data; | |
| final double progress; | |
| @override | |
| BoxConstraints getConstraintsForChild(BoxConstraints constraints) { | |
| return new BoxConstraints( | |
| minWidth: constraints.maxWidth, | |
| maxWidth: constraints.maxWidth, | |
| minHeight: 0.0, | |
| maxHeight: constraints.maxHeight * 9.0 / 16.0 | |
| ); | |
| } | |
| @override | |
| Offset getPositionForChild(Size size, Size childSize) { | |
| return new Offset(0.0, size.height - data.viewInsets.bottom - childSize.height * progress); | |
| } | |
| @override | |
| bool shouldRelayout(_ModalBottomSheetLayout oldDelegate) { | |
| return progress != oldDelegate.progress; | |
| } | |
| } |
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