adityadroid · September 11, 2019 19:54 · motorahul · Sep 19, 2019 · motorahul · Sep 19, 2019
diff --git a/BottomSheetFixed.dart b/BottomSheetFixed.dart
 //Flutter Modal Bottom Sheet
 //Modified by Suvadeep Das
 //Based on https://gist.github.com/andrelsmoraes/9e4af0133bff8960c1feeb0ead7fd749

 import 'dart:async';

 import 'package:flutter/material.dart';
 import 'package:meta/meta.dart';

 const Duration _kBottomSheetDuration = const Duration(milliseconds: 200);

 class _ModalBottomSheetLayout extends SingleChildLayoutDelegate {
  _ModalBottomSheetLayout(this.progress, this.bottomInset);

  final double progress;
  final double bottomInset;

  @override
  BoxConstraints getConstraintsForChild(BoxConstraints constraints) {
    return new BoxConstraints(
        minWidth: constraints.maxWidth,
        maxWidth: constraints.maxWidth,
        minHeight: 0.0,
        maxHeight: constraints.maxHeight
    );
  }

  @override
  Offset getPositionForChild(Size size, Size childSize) {
    return new Offset(0.0, size.height - bottomInset - childSize.height * progress);
  }

  @override
  bool shouldRelayout(_ModalBottomSheetLayout oldDelegate) {
    return progress != oldDelegate.progress || bottomInset != oldDelegate.bottomInset;
  }
 }

 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 GestureDetector(
        onTap: widget.route.dismissOnTap ? () => Navigator.pop(context) : null,
        child: new AnimatedBuilder(
            animation: widget.route.animation,
            builder: (BuildContext context, Widget child) {
              double bottomInset = widget.route.resizeToAvoidBottomPadding
                  ? MediaQuery.of(context).viewInsets.bottom : 0.0;
              return new ClipRect(
                  child: new CustomSingleChildLayout(
                      delegate: new _ModalBottomSheetLayout(widget.route.animation.value, bottomInset),
                      child: new BottomSheet(
                          animationController: widget.route._animationController,
                          onClosing: () => Navigator.pop(context),
                          builder: widget.route.builder
                      )
                  )
              );
            }
        )
    );
  }
 }

 class _ModalBottomSheetRoute<T> extends PopupRoute<T> {
  _ModalBottomSheetRoute({
    this.builder,
    this.theme,
    this.barrierLabel,
    RouteSettings settings,
    this.resizeToAvoidBottomPadding,
    this.dismissOnTap,
  }) : super(settings: settings);

  final WidgetBuilder builder;
  final ThemeData theme;
  final bool resizeToAvoidBottomPadding;
  final bool dismissOnTap;

  @override
  Duration get transitionDuration => _kBottomSheetDuration;

  @override
  bool get barrierDismissible => false;

  @override
  final String barrierLabel;

  @override
  Color get barrierColor => Colors.black54;

  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;
  }
 }

 /// Shows a modal material design bottom sheet.
 ///
 /// A modal bottom sheet is an alternative to a menu or a dialog and prevents
 /// the user from interacting with the rest of the app.
 ///
 /// A closely related widget is a persistent bottom sheet, which shows
 /// information that supplements the primary content of the app without
 /// preventing the use from interacting with the app. Persistent bottom sheets
 /// can be created and displayed with the [showBottomSheet] function or the
 /// [ScaffoldState.showBottomSheet] method.
 ///
 /// The `context` argument is used to look up the [Navigator] and [Theme] for
 /// the bottom sheet. It is only used when the method is called. Its
 /// corresponding widget can be safely removed from the tree before the bottom
 /// sheet is closed.
 ///
 /// Returns a `Future` that resolves to the value (if any) that was passed to
 /// [Navigator.pop] when the modal bottom sheet was closed.
 ///
 /// See also:
 ///
 ///  * [BottomSheet], which is the widget normally returned by the function
 ///    passed as the `builder` argument to [showModalBottomSheet].
 ///  * [showBottomSheet] and [ScaffoldState.showBottomSheet], for showing
 ///    non-modal bottom sheets.
 ///  * <https://material.google.com/components/bottom-sheets.html#bottom-sheets-modal-bottom-sheets>
 Future<T> showModalBottomSheetApp<T>({
  @required BuildContext context,
  @required WidgetBuilder builder,
  bool dismissOnTap: false,
  bool resizeToAvoidBottomPadding : true,
 }) {
  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,
    resizeToAvoidBottomPadding: resizeToAvoidBottomPadding,
    dismissOnTap: dismissOnTap,
  ));
 }
	//Flutter Modal Bottom Sheet
	//Modified by Suvadeep Das
	//Based on https://gist.github.com/andrelsmoraes/9e4af0133bff8960c1feeb0ead7fd749

	import 'dart:async';

	import 'package:flutter/material.dart';
	import 'package:meta/meta.dart';

	const Duration _kBottomSheetDuration = const Duration(milliseconds: 200);

	class _ModalBottomSheetLayout extends SingleChildLayoutDelegate {
	_ModalBottomSheetLayout(this.progress, this.bottomInset);

	final double progress;
	final double bottomInset;

	@override
	BoxConstraints getConstraintsForChild(BoxConstraints constraints) {
	return new BoxConstraints(
	minWidth: constraints.maxWidth,
	maxWidth: constraints.maxWidth,
	minHeight: 0.0,
	maxHeight: constraints.maxHeight
	);
	}

	@override
	Offset getPositionForChild(Size size, Size childSize) {
	return new Offset(0.0, size.height - bottomInset - childSize.height * progress);
	}

	@override
	bool shouldRelayout(_ModalBottomSheetLayout oldDelegate) {
	return progress != oldDelegate.progress \|\| bottomInset != oldDelegate.bottomInset;
	}
	}

	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 GestureDetector(
	onTap: widget.route.dismissOnTap ? () => Navigator.pop(context) : null,
	child: new AnimatedBuilder(
	animation: widget.route.animation,
	builder: (BuildContext context, Widget child) {
	double bottomInset = widget.route.resizeToAvoidBottomPadding
	? MediaQuery.of(context).viewInsets.bottom : 0.0;
	return new ClipRect(
	child: new CustomSingleChildLayout(
	delegate: new _ModalBottomSheetLayout(widget.route.animation.value, bottomInset),
	child: new BottomSheet(
	animationController: widget.route._animationController,
	onClosing: () => Navigator.pop(context),
	builder: widget.route.builder
	)
	)
	);
	}
	)
	);
	}
	}

	class _ModalBottomSheetRoute<T> extends PopupRoute<T> {
	_ModalBottomSheetRoute({
	this.builder,
	this.theme,
	this.barrierLabel,
	RouteSettings settings,
	this.resizeToAvoidBottomPadding,
	this.dismissOnTap,
	}) : super(settings: settings);

	final WidgetBuilder builder;
	final ThemeData theme;
	final bool resizeToAvoidBottomPadding;
	final bool dismissOnTap;

	@override
	Duration get transitionDuration => _kBottomSheetDuration;

	@override
	bool get barrierDismissible => false;

	@override
	final String barrierLabel;

	@override
	Color get barrierColor => Colors.black54;

	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;
	}
	}

	/// Shows a modal material design bottom sheet.
	///
	/// A modal bottom sheet is an alternative to a menu or a dialog and prevents
	/// the user from interacting with the rest of the app.
	///
	/// A closely related widget is a persistent bottom sheet, which shows
	/// information that supplements the primary content of the app without
	/// preventing the use from interacting with the app. Persistent bottom sheets
	/// can be created and displayed with the [showBottomSheet] function or the
	/// [ScaffoldState.showBottomSheet] method.
	///
	/// The `context` argument is used to look up the [Navigator] and [Theme] for
	/// the bottom sheet. It is only used when the method is called. Its
	/// corresponding widget can be safely removed from the tree before the bottom
	/// sheet is closed.
	///
	/// Returns a `Future` that resolves to the value (if any) that was passed to
	/// [Navigator.pop] when the modal bottom sheet was closed.
	///
	/// See also:
	///
	/// * [BottomSheet], which is the widget normally returned by the function
	/// passed as the `builder` argument to [showModalBottomSheet].
	/// * [showBottomSheet] and [ScaffoldState.showBottomSheet], for showing
	/// non-modal bottom sheets.
	/// * <https://material.google.com/components/bottom-sheets.html#bottom-sheets-modal-bottom-sheets>
	Future<T> showModalBottomSheetApp<T>({
	@required BuildContext context,
	@required WidgetBuilder builder,
	bool dismissOnTap: false,
	bool resizeToAvoidBottomPadding : true,
	}) {
	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,
	resizeToAvoidBottomPadding: resizeToAvoidBottomPadding,
	dismissOnTap: dismissOnTap,
	));
	}