Why is my StreamController not triggering on scroll? Flutter - flutter

Question

We have a gridview.builder showing thumbnails which on tap lead to videos in a gridview. We have a streamcontroller that should trigger as you hit the bottom of the page, load a block (12 thumbnails a time). We wanted to make The whole page scroll. But now the streamcontroller doesn't trigger. If I remove the Neverscrollable physics from the gridview.builder it will trigger.
So in short, I want to be able to scroll the entire page, profile information and then through the ever loading video thumbnails. I am stuck as to why this isn't working. How do I make the streamcontroller trigger with the entire page able to scroll? Help appreciated.
SingleChildScrollView(
controller: _scroller,
physics: ScrollPhysics(),
child: Container(
height: MediaQuery.of(context).size.height,
child: StreamBuilder<List<Post>>(
stream: _streamController,
builder: (context, snapshot) {
return Column(
children: <Widget>[
_buildProfileInfo(_profileUser),
Divider(),
Flexible(
child: GridView.builder(
controller: _scrollController,
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
gridDelegate:
SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 3,
childAspectRatio: 1.0,
mainAxisSpacing: 2.0,
crossAxisSpacing: 2.0,
),
itemCount: _posts.length + 1,
itemBuilder: (BuildContext context, int index) {
if (index == _posts.length) {
if (!_hasMorePosts) {
return SizedBox.shrink();
} else {
return Center(
child: Container(
child: SpinKitThreeBounce(
color: HexColor(hexColorMmRed),
size: 30,
),
));
}
} else {
Post post = _posts[index];
return _buildTilePost(post);
}
},
),
)
],
);
}),
),
);

Answer 1

Container(
height: MediaQuery.of(context).size.height,
child: StreamBuilder<List<Post>>(
stream: _streamController,
builder: (context, snapshot) {
return SingleChildScrollView(
controller: _scroller,
child: Column(
children: <Widget>[
_buildProfileInfo(_profileUser),
Divider(),
GridView.builder(
shrinkWrap: true,
primary: false,
gridDelegate:
SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 3,
childAspectRatio: 1.0,
mainAxisSpacing: 2.0,
crossAxisSpacing: 2.0,
),
itemCount: _posts.length + 1,
itemBuilder: (BuildContext context, int index) {
if (index == _posts.length) {
if (!_hasMorePosts) {
return SizedBox.shrink();
} else {
return Center(
child: Container(
child: SpinKitThreeBounce(
color: HexColor(hexColorMmRed),
size: 30,
),
));
}
} else {
Post post = _posts[index];
return _buildTilePost(post);
}
},
)
],
),
);
}),
);
Answer found here