DraggableScrollableSheet from showModalBottomSheet snaps to unspecified extent

Steps to Reproduce

Paste the code from the sample below under MaterialApp's home property
Run the app and press the bugs button
A draggable scrollable sheet will appear.

Actual results:
Sometimes, when you want to dismiss the bottom scrollable sheet by dragging, it will stick to the bottom instead of disappearing, even though there are only 2 snap sizes specified (0.8 and 1.0):

2022-12-02.19.41.44.mov

Expected results:
Proper dismiss behavior should be implemented.

Code sample

import 'package:flutter/material.dart';

class TestScreen extends StatelessWidget {
  const TestScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            showModalBottomSheet(
              enableDrag: true,
              useSafeArea: true,
              clipBehavior: Clip.hardEdge,
              shape: const RoundedRectangleBorder(
                borderRadius: BorderRadius.only(
                  topLeft: Radius.circular(20),
                  topRight: Radius.circular(20),
                ),
              ),
              context: context,
              isScrollControlled: true,
              builder: (context) {
                return DraggableScrollableSheet(
                  expand: false,
                  initialChildSize: 0.8,
                  snap: true,
                  snapSizes: const [0.8, 1.0],
                  builder: (context, scrollController) {
                    return CustomScrollView(
                      controller: scrollController,
                      physics: const ClampingScrollPhysics(),
                      slivers: [
                        SliverPersistentHeader(
                          delegate: TestSliverAppBar(),
                          pinned: true,
                        ),
                        SliverList(
                          delegate: SliverChildBuilderDelegate(
                            (_, index) => ListTile(
                              title: Text("Index: $index"),
                            ),
                            childCount: 50,
                          ),
                        )
                      ],
                    );
                  },
                );
              },
            );
          },
          child: const Text(
            'bugs',
          ),
        ),
      ),
    );
  }
}

class TestSliverAppBar extends SliverPersistentHeaderDelegate {
  @override
  Widget build(
      BuildContext context, double shrinkOffset, bool overlapsContent) {
    return Container(
      color: Colors.pink,
    );
  }

  @override
  double get maxExtent => 100;

  @override
  double get minExtent => 50;

  @override
  bool shouldRebuild(covariant SliverPersistentHeaderDelegate oldDelegate) =>
      true;
}

Logs

[!] Flutter (Channel master, 3.6.0-14.0.pre.2, on macOS 12.6 21G115 darwin-arm64, locale ru-RU)
    • Flutter version 3.6.0-14.0.pre.2 on channel master at /Users/gidrokolbaska/Developer/flutter
    ! Warning: `dart` on your path resolves to /opt/homebrew/Cellar/dart/2.16.0/libexec/bin/dart, which is not inside your
      current Flutter SDK checkout at /Users/gidrokolbaska/Developer/flutter. Consider adding
      /Users/gidrokolbaska/Developer/flutter/bin to the front of your path.
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 7572ce907f (35 hours ago), 2022-12-01 01:07:29 -0500
    • Engine revision 51356bf895
    • Dart version 2.19.0 (build 2.19.0-444.0.dev)
    • DevTools version 2.20.0
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to
      perform update checks and upgrades.

[✓] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
    • Android SDK at /Users/gidrokolbaska/Library/Android/sdk
    • Platform android-32, build-tools 32.1.0-rc1
    • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 14.0.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 14A400
    • CocoaPods version 1.11.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2021.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)

[✓] VS Code (version 1.73.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.34.0

[✓] Connected device (3 available)
    • iPhone 12 (mobile) • 070B14C3-C297-4A54-A136-A502B61105DF • ios            •
      com.apple.CoreSimulator.SimRuntime.iOS-16-0 (simulator)
    • macOS (desktop)    • macos                                • darwin-arm64   • macOS 12.6 21G115 darwin-arm64
    • Chrome (web)       • chrome                               • web-javascript • Google Chrome 108.0.5359.71

[✓] HTTP Host Availability
    • All required HTTP hosts are available

! Doctor found issues in 1 category.

@Piinks

Hello, @Piinks! This is the 2nd part of the issue #116427

It looks like this is unexpected behavior based on the provided snapSizes. I wonder if the Scaffold bottom sheet dismissal handling is interfering with the draggable scrollable sheet's gestures.

It looks like this is unexpected behavior based on the provided snapSizes. I wonder if the Scaffold bottom sheet dismissal handling is interfering with the draggable scrollable sheet's gestures.

yes, that's what I thought as well, but it's was still worth creating an issue for that because it might be that I'm just using DraggableScrollableSheet in conjunction with showModalBottomSheet incorrectly

Any progress here? this prevents us from calling DraggableScrolllableSheet via showModalBottomSheet...

As a partial diagnosis: I think the point where it sticks at is the minChildSize. By default that's 0.25, which is what we see in the repro video.

(I haven't looked closer to understand how that causes this behavior.)

@xu-baolin

The minChildSize and maxChildSize are implicitly included in snap sizes even if you do not specify explicitly, that's why there is snap at minChildSize. However the real issue is when you fling it to close, it briefly stops at minChildSize before closing which gives a bad UX, @xu-baolin might have a clue

I've written a dirty workaround to have it look good on the UI side of things. Hope that helps

#36283 (comment)

is there any progress here?

Seems like this has been fixed in #165557

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

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DraggableScrollableSheet from showModalBottomSheet snaps to unspecified extent #116982

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DraggableScrollableSheet from showModalBottomSheet snaps to unspecified extent #116982

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gidrokolbaska commented on Dec 13, 2022

Piinks commented on Dec 13, 2022

gidrokolbaska commented on Dec 14, 2022

kamami commented on Feb 6, 2023

gnprice commented on Feb 24, 2023

absar commented on Apr 10, 2023

julianniedermaier commented on Jun 16, 2023

yesilcimenahmet commented on Feb 8, 2025

gidrokolbaska commented on Apr 8, 2025

github-actions commented on Apr 30, 2025

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