allow to pass closeProgressThreshold double to showModat methods

@@ -18,8 +18,8 @@ const Curve _decelerateEasing = Cubic(0.0, 0.0, 0.2, 1.0);
 const Curve _modalBottomSheetCurve = _decelerateEasing;
 const Duration _bottomSheetDuration = Duration(milliseconds: 400);
 const double _minFlingVelocity = 500.0;
-const double _closeProgressThreshold = 0.6;
-const double _willPopThreshold = 2;
+const double _closeProgressThreshold = 0.8;
+const double _willPopThreshold = 0.8;
 
 typedef ScrollWidgetBuilder = Widget Function(
     BuildContext context, ScrollController controller);
@@ -42,6 +42,7 @@ class ModalBottomSheet extends StatefulWidget {
   /// Creates a bottom sheet.
   const ModalBottomSheet({
     Key key,
+    this.closeProgressThreshold = _closeProgressThreshold,
     this.animationController,
     this.animationCurve,
     this.enableDrag = true,
@@ -57,6 +58,8 @@ class ModalBottomSheet extends StatefulWidget {
         assert(builder != null),
         super(key: key);
 
+  final double closeProgressThreshold;
+
   /// The animation controller that controls the bottom sheet's entrance and
   /// exit animations.
   ///
@@ -152,7 +155,7 @@ class _ModalBottomSheetState extends State<ModalBottomSheet>
       widget.animationController.value < _willPopThreshold;
 
   bool get hasReachedCloseThreshold =>
-      widget.animationController.value < _closeProgressThreshold;
+      widget.animationController.value < widget.closeProgressThreshold;
 
   void _close() {
     isDragging = false;

@@ -11,6 +11,7 @@ const Duration _bottomSheetDuration = Duration(milliseconds: 400);
 class _ModalBottomSheet<T> extends StatefulWidget {
   const _ModalBottomSheet({
     Key key,
+    this.closeProgressThreshold,
     this.route,
     this.secondAnimationController,
     this.bounce = false,
@@ -22,6 +23,7 @@ class _ModalBottomSheet<T> extends StatefulWidget {
         assert(enableDrag != null),
         super(key: key);
 
+  final double closeProgressThreshold;
   final ModalBottomSheetRoute<T> route;
   final bool expanded;
   final bool bounce;
@@ -85,6 +87,7 @@ class _ModalBottomSheetState<T> extends State<_ModalBottomSheet<T>> {
           label: _getRouteLabel(),
           explicitChildNodes: true,
           child: ModalBottomSheet(
+            closeProgressThreshold: widget.closeProgressThreshold,
             expanded: widget.route.expanded,
             containerBuilder: widget.route.containerBuilder,
             animationController: widget.route._animationController,
@@ -113,6 +116,7 @@ class _ModalBottomSheetState<T> extends State<_ModalBottomSheet<T>> {
 
 class ModalBottomSheetRoute<T> extends PopupRoute<T> {
   ModalBottomSheetRoute({
+    this.closeProgressThreshold,
     this.containerBuilder,
     this.builder,
     this.scrollController,
@@ -131,6 +135,7 @@ class ModalBottomSheetRoute<T> extends PopupRoute<T> {
         assert(enableDrag != null),
         super(settings: settings);
 
+  final double closeProgressThreshold;
   final WidgetWithChildBuilder containerBuilder;
   final ScrollWidgetBuilder builder;
   final bool expanded;
@@ -180,6 +185,7 @@ class ModalBottomSheetRoute<T> extends PopupRoute<T> {
       context: context,
       // removeTop: true,
       child: _ModalBottomSheet<T>(
+        closeProgressThreshold: closeProgressThreshold,
         route: this,
         secondAnimationController: secondAnimationController,
         expanded: expanded,

@@ -75,6 +75,7 @@ Future<T> showBarModalBottomSheet<T>({
   Color backgroundColor,
   double elevation,
   ShapeBorder shape,
+  double closeProgressThreshold,
   Clip clipBehavior,
   Color barrierColor = Colors.black87,
   bool bounce = true,
@@ -99,6 +100,7 @@ Future<T> showBarModalBottomSheet<T>({
       .push(ModalBottomSheetRoute<T>(
     builder: builder,
     bounce: bounce,
+    closeProgressThreshold: closeProgressThreshold,
     containerBuilder: (_, __, child) => BarBottomSheet(
       child: child,
       control: topControl,

@@ -6,6 +6,7 @@ import 'dart:async';
 Future<T> showMaterialModalBottomSheet<T>({
   @required BuildContext context,
   @required ScrollWidgetBuilder builder,
+  double closeProgressThreshold,
   Color backgroundColor,
   double elevation,
   ShapeBorder shape,
@@ -31,6 +32,7 @@ Future<T> showMaterialModalBottomSheet<T>({
   final result = await Navigator.of(context, rootNavigator: useRootNavigator)
       .push(ModalBottomSheetRoute<T>(
     builder: builder,
+    closeProgressThreshold: closeProgressThreshold,
     containerBuilder: _materialContainerBuilder(
       context,
       backgroundColor: backgroundColor,