how to see the element in emulator ui in flutter - flutter

Question

Now I am adding a scrollbar to my app, this is my code:
final ScrollController _scrollController = ScrollController();
return GestureDetector(
onHorizontalDragStart: _onHorizontalDragStart,
onHorizontalDragUpdate: _onHorizontalDragUpdate,
onHorizontalDragEnd: _onHorizontalDragEnd,
child: Container(
constraints: BoxConstraints(
minHeight: MediaQuery.of(context).size.height * 0.9,
),
color: Theme.of(context).scaffoldBackgroundColor,
child: CupertinoScrollbar(
isAlwaysShown: true,
controller: _scrollController,
child: Padding(
padding: const EdgeInsets.all(16.0),
child: buildListView(item, context),
),
)));
but in the UI, I did not find the ScrollBar. How to make the scrollbar show on the UI? or like inspect element like html in Chrome. this is the UI:
I have wake up the Flutter Inspector, but when I click the element, nothing happen in the emulator. Now I am using SingleChildScrollView:
SingleChildScrollView buildListView(Item item, BuildContext context) {
return SingleChildScrollView(
controller: _scrollController,
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
InkWell(
onTap: () => CommonUtils.launchUrl(item.link),
child: Padding(
padding: const EdgeInsets.only(bottom: 8.0),
child: Container(
child: Text(
item.title == "" ? "Comment" : item.title,
style: Theme.of(context).textTheme.headline5!.copyWith(
fontWeight: FontWeight.w600,
),
),
),
),
),
if (item.domain != "")
Padding(
padding: const EdgeInsets.only(bottom: 8.0),
child: InkWell(
onTap: () async {
navToChannelDetail();
},
child: Text(
item.domain,
style: Theme.of(context).textTheme.caption!.copyWith(color: Theme.of(context).primaryColor),
)),
),
InkWell(
onTap: () {},
child: RichText(
text: TextSpan(
children: <TextSpan>[
TextSpan(
text: item.author,
style: Theme.of(context).textTheme.caption,
),
TextSpan(
text: " ${String.fromCharCode(8226)} ",
style: Theme.of(context).textTheme.caption,
),
TextSpan(
text: item.ago,
style: Theme.of(context).textTheme.caption,
),
],
),
),
),
if (item.content != "")
Html(
data: item.content,
style: {
"body": Style(
fontSize: FontSize(19.0),
),
},
//sonLinkTap: (url) => CommonUtils.launchUrl(url),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Row(
children: [
Padding(
padding: const EdgeInsets.only(right: 16.0),
child: Row(
children: [
if (item.isFav == 1)
IconButton(
icon: Icon(Icons.bookmark, color: Theme.of(context).primaryColor),
onPressed: () => touchFav("unfav", FavStatus.UNFAV),
),
if (item.isFav != 1)
IconButton(
icon: Icon(Icons.bookmark),
onPressed: () => touchFav("fav", FavStatus.FAV),
),
Padding(
padding: const EdgeInsets.only(left: 0.0),
child: Text(
"${item.favCount}",
textAlign: TextAlign.center,
style: Theme.of(context).textTheme.caption!.copyWith(
color: Theme.of(context).primaryColor,
),
),
),
],
),
),
Padding(
padding: const EdgeInsets.only(bottom: 0.0),
child: Row(
children: [
if (item.isUpvote == 1)
IconButton(
icon: Icon(Icons.thumb_up, color: Theme.of(context).primaryColor),
onPressed: () => touchUpvote("unupvote", UpvoteStatus.UNUPVOTE),
),
if (item.isUpvote != 1)
IconButton(
icon: Icon(Icons.thumb_up),
onPressed: () => touchUpvote("upvote", UpvoteStatus.UPVOTE),
),
Padding(
padding: const EdgeInsets.only(left: 8.0),
child: Text(
"${item.upvoteCount}",
textAlign: TextAlign.center,
style: Theme.of(context).textTheme.caption!.copyWith(
color: Theme.of(context).primaryColor,
),
),
),
],
),
),
],
),
IconButton(
icon: Icon(
Feather.share_2,
),
onPressed: () => handleShare(id: item.id, title: item.title, postUrl: item.link),
),
],
),
],
));
}

Answer 1

You must add the _scrollController to ListView
You can try this , I hope to help you :
return Container(
constraints: BoxConstraints(
minHeight: MediaQuery.of(context).size.height * 0.9,
),
color: Theme.of(context).scaffoldBackgroundColor,
child: CupertinoScrollbar(
isAlwaysShown: true,
controller: _scrollController,
child: Padding(
padding: const EdgeInsets.all(16.0),
child: ListView.builder(
controller: _scrollController,
itemCount: 500,
shrinkWrap: true,
itemBuilder:(_, index){
return Text('Index Number : '+index.toString());
}),
),
));