Scrollbar not displayed flutter web

Question

Scrollbar not displayed in flutter web. my second try is:

Widget getSecondStep() {
        return  DraggableScrollbar.arrows(
          controller: ScrollController(),
          child: ListView(
              shrinkWrap: true,
              children: <Widget>[
                Row(
                  mainAxisSize: MainAxisSize.min,
                  mainAxisAlignment: MainAxisAlignment.center,
                  crossAxisAlignment: CrossAxisAlignment.center,
                  children: <Widget>[BlaBlaBla(), BlaBla()],
                ),
              ],
            ),
        );
      }

and my first try was:

Widget getSecondStep() {
        return  Scrollbar(
          controller: ScrollController(),
          child: ListView(
              shrinkWrap: true,
              children: <Widget>[
                Row(
                  mainAxisSize: MainAxisSize.min,
                  mainAxisAlignment: MainAxisAlignment.center,
                  crossAxisAlignment: CrossAxisAlignment.center,
                  children: <Widget>[BlaBlaBla(), BlaBla()],
                ),
              ],
            ),
        );
      }

i'm trying to change theme color but it didn't work.

finally, flutter doctor -v

 [√] Flutter (Channel beta, v1.14.6, on Microsoft Windows [Version
 10.0.18362.657], locale en-US)
     • Flutter version 1.14.6 at C:\flutter_windows_v1.9.1+hotfix.2-stable\flutter
     • Framework revision fabeb2a16f (4 weeks ago), 2020-01-28 07:56:51 -0800
     • Engine revision c4229bfbba
     • Dart version 2.8.0 (build 2.8.0-dev.5.0 fc3af737c7)


 [√] Android toolchain - develop for Android devices (Android SDK
 version 29.0.2)
     • Android SDK at C:\Users\moshi\AppData\Local\Android\sdk
     • Android NDK location not configured (optional; useful for native profiling support)
     • Platform android-29, build-tools 29.0.2
     • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
     • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
     • All Android licenses accepted.

 [√] Chrome - develop for the web
     • Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

 [√] Android Studio (version 3.5)
     • Android Studio at C:\Program Files\Android\Android Studio
     • Flutter plugin version 40.0.2
     • Dart plugin version 191.8423
     • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)

 [!] VS Code (version 1.42.1)
     • VS Code at C:\Users\moshi\AppData\Local\Programs\Microsoft VS Code
     X Flutter extension not installed; install from
       https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

 [√] Connected device (2 available)
     • Chrome     • chrome     • web-javascript • Google Chrome 79.0.3945.130
     • Web Server • web-server • web-javascript • Flutter Tools

 ! Doctor found issues in 1 category.

Answer 1

EDIT: MAY 2021 UPDATE: Scrollbar should be visible by default since Flutter 2.2

---

OLD ANSWER:

Wrap a ListView with Scrollbar and use the same scroll controller like this:

          Scrollbar(
            isAlwaysShown: true,
            controller: _scrollController,
            child: ListView.builder(
                controller: _scrollController,
                itemCount: 100,
                itemBuilder: (context, index) {
                  return Card(
                      child: ListTile(
                    title: Text("Item: ${index + 1}"),
                  ));
                }),
          ),

Answer 2

as of flutter 2.2 default behaviour for most scrollable widgets on web and desktop is to display scrollbar while scrolling and to quickly fade away the scrollbar when scrolling has ended. to persist the scrollbar after scrolling has ended wrap the scrollable widget in a theme as follows:

Theme(
    data: Theme.of(context).copyWith(scrollbarTheme: const ScrollbarThemeData(isAlwaysShown: true)),
    child: SingleChildScrollView(
       controller: scrollController,

Note the added scrollController to avoid conflicting positions of the PrimaryScrollController if you are using multiple scrollable widgets.

One last thing to note is that if you wish the scrollbar to be visible even before first scrolling you have to hack it somehow. My solution was to scroll programmatically after the frame has been built:

WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
  scrollController.animateTo(3, duration: const Duration(milliseconds: 200), curve: Curves.ease);
});

Hope this comes in handy some day...